K20 Afi Intake Manifold

Applications: K20 and K24 engines in EG, DC2, EK (w/ EG subframe only) plus other K-Series Chassis (may require modification to fit)

• Skunk2 04-08 TSX / 06-11 Civic Si Pro Series K-Series Intake Manifold: Black $503.99 $479.99 ★★★★★ ★★★★★ Vehicle Specific K-Tuned K20 Intake.
• Get the best deals on Intake Manifolds for 1978 Chevrolet K20 when you shop the largest online selection at eBay.com. Free shipping on many items Browse your favorite brands affordable prices.

Throttle body Fitment: K-Tuned 80mm and 90mm TB or any TB with a 86-93 Ford 5.0L Mustang flange.

NOTE: The stock water pump needs to be modified and a K-Tuned AC/PS Eliminator Pulley Kit must be used.

For our K-Tuned Intake Manifold project we partnered up with a long time friend and owner of Magnus Motorsports to design a performance intake manifold to properly fit multiple K-powered cars. We worked with Magnus previously when they helped us out with the custom intake manifold on our awesome K20 powered RX7. Magnus is well known in the aftermarket industry for their high quality intake manifolds and they have been designing and welding up their own product for several years now. We knew the Magnus design worked, but wanted to collaborate and find an overall manifold layout that addressed the fitment concerns on several different Honda chassis. Clearance to the rad support and the hood were areas that needed attention, so we lowered the plenum and shortened the runners a little bit, while still keeping a clean entry angle into the head port. The result was exactly what we were looking for, a big plenum, short runner, performance intake manifold that fits numerous vehicles. This specific intake manifold design is being offered exclusively by K-Tuned and makes significant top end power gains over the factory intake manifold on both naturally aspirated and forced induction applications. Note that the stock water passage needs to be modified and a K-Tuned AC/PS Eliminator Pulley setup must be used. K24 heads will need to use our K24 Intake Manifold Adapter.

Skunk2 06-08 TSX / 06-11 Civic Si Pro Series K-Series Intake Manifold: Silver $471.99 $449.99 Vehicle Specific Skunk2 K-Series Silver Ultra Series Intake Manifold.

Get the best deals on Intake Manifolds for Chevrolet K20 when you shop the largest online selection at eBay.com. Free shipping on many items. (12) 12 product ratings - Edelbrock Intake Manifold 7561; RPM Air-Gap Oval Port Air-Gap Aluminum for BBC. Chevrolet K20 Intake Manifold. Refine by: Intake Manifold (part) Price. $250 - $500 (8) $500.

The K-Tuned Center Feed Intake Manifold features a very large 5.2L sheet metal plenum shaped in the signature tapered Magnus format. If you look closely at the head flange and plenum base flange, you'll find two custom 6061 billet aluminum pieces that are precision machined using a CNC 3D profiling process. This special CNC process is what ultimately helped make this manifold design possible, allowing us to make the necessary multi-axis CNC cuts. The throttle body bolt pattern matches up to the 86-93 Ford Mustang 5.0L specs, which means our K-Tuned 90mm Throttle bodies will bolt up seamlessly. The custom billet plenum base is a work of art, with four precision machined internal V-stacks that are designed to increase runner entry air speed. We also provided one 3/8 NPT and two 1/8 NPT vacuum ports that are neatly tucked away on the plenum base, and positioned between each runner. The runners themselves, measure 5.75' long with a large diameter of 1.875', and are capable of supplying even heavily modified K-Series engines with plenty of air. The manifold flange at the cylinder head is available for K20 and K24 heads and is another 6061 billet piece, that maintains proper port entry and injector angles. Included with our manifold is a brushed aluminum K-Tuned Fuel Rail, which is held in place on a rail mount that is designed to keep the stock phenolic fuel rail spacers in place and accept both stock or aftermarket K-Series fuel injectors. As usual, we include all the hardware, specifically the bolts for mounting the manifold to the cylinder head and the 4 bolts for our throttle body. Last, but not least, we placed an aluminum K-Tuned badge on the front of the plenum to add a nice finishing touch.

Honda K20A/K20C engine specs

Honda K20A (K20C, K20Z) engine reliability, problems and repair

In the end of 2000, production of JDM Honda Stream with the new K20A engine started. This engine replaced B16, B18, B20, H22, and F20, and it was the first in K series Honda engines. Later, this family included K23 and K24.
An inline-4 cylinder block made of aluminum was developed for K20A, its deck height was 212 mm. Inside the unit, they installed the 86 mm stroke crankshaft, the size of the pistons is also 86 mm, their height is 30 mm, the length of connecting rods is 139 mm. All this together provided 2 liters of displacement.
Some K20 versions were equipped with balance shafts.
The cylinder block is covered with a new DOHC head, to which the i-VTEC system is added that consisted of VTEC for intake valves, and VTC for intake and exhaust valves. It knows how to use the 12-valve mode to save fuel and the 16-valve mode in case of dynamic driving. The intake valves size is 35 mm, of exhaust valves – 30 mm, and valve stem diameter is 5.5 mm.
The camshafts are rotated by a timing chain with the service life longer than 120,000 miles of mileage.
Valves should to be adjusted after every 24,000 miles. Valve clearances for the cold engine are the following: intake 0.21-0.25 mm, exhaust 0.28-0.32 mm.
Here dual runner intake manifold and an EGR valve were used here for sending part of the exhaust gases back into the combustion chamber, which improves the ecological class of the vehicle. The K20A firing order is 1-3-4-2.
K20A engines were made in a wide variety of modifications and they were quite different. You can learn about the basic differences below.
In 2007, K20 was replaced with R20A engines. Today, only one version is made, K20C.

Applications: K20 and K24 engines in EG, DC2, EK (w/ EG subframe only) plus other K-Series Chassis (may require modification to fit)

• Skunk2 04-08 TSX / 06-11 Civic Si Pro Series K-Series Intake Manifold: Black $503.99 $479.99 ★★★★★ ★★★★★ Vehicle Specific K-Tuned K20 Intake.
• Get the best deals on Intake Manifolds for 1978 Chevrolet K20 when you shop the largest online selection at eBay.com. Free shipping on many items Browse your favorite brands affordable prices.

Throttle body Fitment: K-Tuned 80mm and 90mm TB or any TB with a 86-93 Ford 5.0L Mustang flange.

NOTE: The stock water pump needs to be modified and a K-Tuned AC/PS Eliminator Pulley Kit must be used.

For our K-Tuned Intake Manifold project we partnered up with a long time friend and owner of Magnus Motorsports to design a performance intake manifold to properly fit multiple K-powered cars. We worked with Magnus previously when they helped us out with the custom intake manifold on our awesome K20 powered RX7. Magnus is well known in the aftermarket industry for their high quality intake manifolds and they have been designing and welding up their own product for several years now. We knew the Magnus design worked, but wanted to collaborate and find an overall manifold layout that addressed the fitment concerns on several different Honda chassis. Clearance to the rad support and the hood were areas that needed attention, so we lowered the plenum and shortened the runners a little bit, while still keeping a clean entry angle into the head port. The result was exactly what we were looking for, a big plenum, short runner, performance intake manifold that fits numerous vehicles. This specific intake manifold design is being offered exclusively by K-Tuned and makes significant top end power gains over the factory intake manifold on both naturally aspirated and forced induction applications. Note that the stock water passage needs to be modified and a K-Tuned AC/PS Eliminator Pulley setup must be used. K24 heads will need to use our K24 Intake Manifold Adapter.

Skunk2 06-08 TSX / 06-11 Civic Si Pro Series K-Series Intake Manifold: Silver $471.99 $449.99 Vehicle Specific Skunk2 K-Series Silver Ultra Series Intake Manifold.

Get the best deals on Intake Manifolds for Chevrolet K20 when you shop the largest online selection at eBay.com. Free shipping on many items. (12) 12 product ratings - Edelbrock Intake Manifold 7561; RPM Air-Gap Oval Port Air-Gap Aluminum for BBC. Chevrolet K20 Intake Manifold. Refine by: Intake Manifold (part) Price. $250 - $500 (8) $500.

The K-Tuned Center Feed Intake Manifold features a very large 5.2L sheet metal plenum shaped in the signature tapered Magnus format. If you look closely at the head flange and plenum base flange, you'll find two custom 6061 billet aluminum pieces that are precision machined using a CNC 3D profiling process. This special CNC process is what ultimately helped make this manifold design possible, allowing us to make the necessary multi-axis CNC cuts. The throttle body bolt pattern matches up to the 86-93 Ford Mustang 5.0L specs, which means our K-Tuned 90mm Throttle bodies will bolt up seamlessly. The custom billet plenum base is a work of art, with four precision machined internal V-stacks that are designed to increase runner entry air speed. We also provided one 3/8 NPT and two 1/8 NPT vacuum ports that are neatly tucked away on the plenum base, and positioned between each runner. The runners themselves, measure 5.75' long with a large diameter of 1.875', and are capable of supplying even heavily modified K-Series engines with plenty of air. The manifold flange at the cylinder head is available for K20 and K24 heads and is another 6061 billet piece, that maintains proper port entry and injector angles. Included with our manifold is a brushed aluminum K-Tuned Fuel Rail, which is held in place on a rail mount that is designed to keep the stock phenolic fuel rail spacers in place and accept both stock or aftermarket K-Series fuel injectors. As usual, we include all the hardware, specifically the bolts for mounting the manifold to the cylinder head and the 4 bolts for our throttle body. Last, but not least, we placed an aluminum K-Tuned badge on the front of the plenum to add a nice finishing touch.

Honda K20A/K20C engine specs

Honda K20A (K20C, K20Z) engine reliability, problems and repair

In the end of 2000, production of JDM Honda Stream with the new K20A engine started. This engine replaced B16, B18, B20, H22, and F20, and it was the first in K series Honda engines. Later, this family included K23 and K24.
An inline-4 cylinder block made of aluminum was developed for K20A, its deck height was 212 mm. Inside the unit, they installed the 86 mm stroke crankshaft, the size of the pistons is also 86 mm, their height is 30 mm, the length of connecting rods is 139 mm. All this together provided 2 liters of displacement.
Some K20 versions were equipped with balance shafts.
The cylinder block is covered with a new DOHC head, to which the i-VTEC system is added that consisted of VTEC for intake valves, and VTC for intake and exhaust valves. It knows how to use the 12-valve mode to save fuel and the 16-valve mode in case of dynamic driving. The intake valves size is 35 mm, of exhaust valves – 30 mm, and valve stem diameter is 5.5 mm.
The camshafts are rotated by a timing chain with the service life longer than 120,000 miles of mileage.
Valves should to be adjusted after every 24,000 miles. Valve clearances for the cold engine are the following: intake 0.21-0.25 mm, exhaust 0.28-0.32 mm.
Here dual runner intake manifold and an EGR valve were used here for sending part of the exhaust gases back into the combustion chamber, which improves the ecological class of the vehicle. The K20A firing order is 1-3-4-2.
K20A engines were made in a wide variety of modifications and they were quite different. You can learn about the basic differences below.
In 2007, K20 was replaced with R20A engines. Today, only one version is made, K20C.

Honda K20 engine modifications and differences

1. K20A is a sports JDM version made since 2001. The engine power is 220 HP @ 8,000 rpm, the torque is 215 Nm @ 6,100 rpm.
Balancer shafts, a more rigid crankshaft, high compression pistons (CR = 11.5), reinforced connecting rods are installed into the cylinder block, and dual valve springs, dynamic camshafts, a lightened flywheel, a PRC intake manifold (an RBC intake manifold for Euro R), an improved header 4-2-1 and a 54 mm exhaust system are used. The size of standard fuel injectors is 310 cc.
The JDM K20A camshafts specifications are as follows: intake 244 (8.84)/280 (12.65)/245 (9.68), exhaust 240 (8.59)/278 (12.14)/244 (8.74).
Head porting is made for this engine at the factory. The size of the throttle body was 62 mm.
In 2007, the K20A engine received some upgrades. They installed a short RRC intake manifold, a 64 mm throttle body, improved the intake and exhaust head ports, installed reinforced connecting rods, and the compression ratio reached 11.7. Now the VTEC system is triggered at 5,800 rpm (instead of 6,000 rpm as before).
For 2007 JDM K20A, a 4-2-1 short header and a straighter 54 mm exhaust system are used. As a result, the power increased to 225 HP @ 8000 rpm, the torque is 215 Nm @ 6,100 rpm, and the rev limiter is triggered at 8,600 rpm.
This engine can be found only in JDM Civic Type R FD2.
2. K20A1 – this version was described in the beginning of the article. The power was 156 HP @ 6,500 rpm, and the torque was 188 Nm @ 4,000 rpm.
3. K20A2 is an analogue to JDM K20A, but it uses different camshafts and a PRB intake manifold. Here are the K20A2 cam specs: intake – 238 (7.36)/278 (12.42)/240 (7.82), exhaust – 240 (7.14)/280 (11.12)/242 (7.72). The compression ratio is slightly lower – 11, and the i-VTEC system is triggered at 5,800 rpm. The power was 201 HP @ 7,400 rpm, the torque is 193 Nm @ 6,000 rpm, and the rev limiter is triggered at 8,250 rpm. The size of OEM fuel injectors is 310 cc.
4. K20A3 is an analogue to K20A1 for 2002-2006 Acura RSX and 2002-2005 Honda Civic Si. The size of injectors is 270 cc, i-VTEC is triggered at 2,200 rpm. A PPA intake manifold is used here, which is triggered at 4,600 rpm. For Honda Civic Si, a 1-stage PRB intake manifold was used.
5. K20A4 is an analogue to K20A3 for USDM 2003-2007 Honda Accord and 2002-2006 Honda CR-V.
6. K20A6 is an analogue to K20A3 for the European and Australian 2003-2006 Honda Accord.
7. K20Z1 is a modified version of the K20A2 engine. Here they modified the intake system, used the same PRB intake manifold, a new exhaust manifold, and installed more dynamic camshafts, which resulted in 210 HP @ 7,800 rpm, and the torque was 194 Nm @ 6,200 rpm.
7. K20Z2 is a replacement for K20A, it featured a new long runner intake manifold, modified camshafts and the Drive by wire technology. The power was 155 HP @ 6,000 rpm, and the torque was 188 Nm @ 4,500 rpm.
8. K20Z3 is an analogue to K20Z1, but with different camshafts and an RRB intake manifold. The power was 197 HP @ 7,800 rpm, and the torque was 188 Nm @ 6,200 rpm. It was intended for 2006-2011 Honda Civic Si and 2007-2010 Acura CSX Type S.
9. K20Z4 is an analogue to K20Z3, but with an RSP intake manifold. It can be found in European 2007-2010 Civic Type R. The power was 201 HP @ 7,800 rpm, and the torque was 199 Nm @ 6,800 rpm.
10. K20C1 is a turbocharged version for 2015+ Honda Civic Type R. A new lightweight crankshaft, forged connecting rods, and modified pistons (compression ratio 9.8) are used here. In addition, a new cylinder head with direct injection system and i-VTEC system for intake and exhaust valves is used. The engineers improved the intake and exhaust head ports, and added a single-scroll MHI TD04 turbocharger. Boost pressure here is 23.2 PSI (1.58 bar).
All these upgrades were a success, and the engine reached 310 HP @ 6,500 rpm and the torque is 400 Nm @ 2,500 – 4,500 rpm, with the rev limit of 7,000 rpm.
11. K20C2 is a naturally aspirated version of the K20C for 2016+ Honda Civic. For this engine, a modified i-VTEC head with a direct injection system and improved combustion chambers is used. Similar to K20C1, a lightweight crankshaft and modified pistons (compression ratio 10.8) are used. The power of this engine is 158 HP @ 6,500 rpm, and the torque is 187 Nm @ 4,200 rpm.
12. K20C3 is an analogue to K20C1, but here the compression ratio was increased to 10.8 and a MHI TD03 turbocharger is used. The power is 272 HP @ 6,500 rpm, with the torque of 370 Nm @ 1,500 to 4,000 rpm.
13. K20C4 is an analogue to K20C1 with a MHI TD03 turbocharger. The boost pressure is 20.8 PSI (1.43 bar), the power is 252 HP @ 6,500 rpm, with the torque of 370 Nm @ 1,500 to 4,000 rpm.

Honda K20A (K20Z, K20C) engine problems and malfunctions

1. Knocking sound in the engine. It is probably time to adjust valves. If this is not done, increased wear of the exhaust camshaft begins. This is a typical disease of the K20 engine, the camshaft is to be checked and replaced if necessary. Excessive camshaft wear is caused by irregular replacement of motor oil and the use of motor oils not listed in the owner's manual.
2. Oil leaks. Check the crankshaft front seal. It is a common problem, replacement will fix it.
3. Rough idle. Experience shows that it is enough to clean the throttle body or the idle air control valve.
4. Vibrations. Check engine mounts, the problem is there almost in all cases. Highly worn engines may have a problem with elongated timing chain.
The engines made between 2000 and 2003 had the nasty problem with the 4th cylinder overheating. Otherwise it is a reliable engine, but it is important to use high quality motor oil and good gasoline. Follow all Honda instructions, come for maintenance in time, and you engine will run for a long time. K20A service life exceeds 200,000 miles of mileage.

Honda K20A/K20C engine tuning

K20/K24 Frankenstein build

For owners of K20A1, K20A3, K20A4, K20A6 and K20Z2, it makes no sense to make performance tuning of their engines. You will have to replace almost the entire engine: the crankshaft, connecting rods, pistons, the entire head with the intake/exhaust system, and the ECU. It would be cheaper to buy a K20A Type R and swap.
If you own a JDM K20A, K20A2, K20Z1, K20Z3 and K20Z4, you are lucky and you can get a lot of power. Buy an RRC intake manifold, it is the best choice for high rpm of all OEM intake manifolds. You will need a FD2 throttle body, a cold air intake system, a 4-2-1 header, a 2.5″ exhaust system and a Hondata K-Pro ECU. Install these performance parts, tune the ECU and you will get up to 230 WHP. These are great upgrades for everyday use.
Want 250 HP? In this case, here are the best mods: a cold air intake, a Skunk2 70 mm throttle body, a Skunk2 intake manifold, Skunk2 Stage 2 cams, adjustable cam gears, Skunk2 valve springs and retainers, a 4-2-1 header, a 3″ exhaust system, a lightweight flywheel and RDX 410 cc fuel injectors.
You can go even further, and do head port and polish, install even more dynamic camshafts and get over 9,000 rpm.
It makes no sense playing with a 2-liter cylinder block, you've got too much already. Next you have to build a K20/K24 Frankenstein. You will need a K24A2 cylinder block and a JDM K20A or a K20A2 head. This will give you what you lacked previously, namely 2.4 liters of displacement.
Buy 87.5 mm Wiseco high compression pistons (or CP pistons) to increase the compression ratio to 12-13. Replace the OEM rods with Carillo I-Beam rods, and install a K20A2 oil pump, Skunk2 Stage 3 cams (or similar), adjustable cam gears, and a lightweight flywheel. You will need a 70 mm throttle body, a Skunk2 intake manifold, Skunk2 valve springs and retainers, a 4-2-1 header, a Walbro 255 lph fuel pump, Acura 410 cc fuel injectors and a Hondata KPro ECU. Here are the aftermarket parts that will let you get a naturally aspirated 300 HP engine. This is not the limit, you can go ahead with a sleeved block, a 2.7 liter stroker kit, individual throttle bodies, with the most dynamic camshafts, etc. The K20A engine can easily reach 10,000 rpm and more, but you will have to spend a small fortune on it.

K20A Turbo

K20 Center Feed Intake Manifold

The easiest way is buying a supercharger kit (Jackson Racing, Kraftwerks, or similar) that can boost the power to 300 HP with the boost pressure of 7-9 psi (0.5-0.6 bar).
K20A stock internals can withstand over 400 horsepower, but it is better to use forged internals to ensure high reliability. Buy low compression pistons (Wiseco/CP), Carillo H-beam rods, ACL bearings, and ARP head studs.
Make complete head porting, install a 800 cc fuel injectors, a Walbro 255 fuel pump, a 4-2-1 header, a 3″ exhaust system, and a KPro and Kraftwerk supercharger kit. These performance mods will give about 400 WHP or more.
You can install a Greddy turbo kit and get similar values. A Garrett GT3076R turbocharger with Skunk2 Stage 2 cams, Skunk2 valve springs and retainers will give you even more power.

K20 Afi Intake Manifold Manifolds

K20C Turbo

Owners of Honda Civic Type R or Honda Accord 2.0 T engines are well off. Out of mods for K20C, you will need a cold air intake system, a front intercooler, a downpipe, a 3″ performance exhaust system, and Stage 2 chip tuning. This will give you up to 380 horsepower (280 HP for Accord X) with only the OEM turbocharger.