help w/ serpentine belt for k24/k20 with k20a2 crank pulley.

[02CivicSI-VTEC]

I am currently. Running a k24 Frank with k20a2 crank pulley running all accessories like AC, k20 water pump ect.my problem is that I am using a a3 serpentine belt and it feel loosen under heavy acceleration. My check engine light blink as the belt seem loose. When I put the a3 cp with stock belt its fine. So any idea what belt is needed? I've Google and wasnt able to find what I am looking for. I've seen a lot of people who running an a2 Cp are running with out AC.

[cyllarus]

I believe what you want is the k20 belt off the 06+ SI. Thats the belt i have on my k24 swap, also using the k20a2 CP and have perfect tension.

[02CivicSI-VTEC]

i never really thought about the 06 Si belt. Thank you so much =)

[cyllarus]

Success?

[02CivicSI-VTEC]

Success?

Fit perfectly,thank so much cyllrus.p the car respond so much faster and car pull amazing. For future build with K24 with k20 crank pulley use 06-09 civic si belt.

[bchaney]

Wow nice find. The only solution I have heard of is to put washers behind the alternator

I'll have to get me one of those belts.

How did you feel it loosen under acceleration? How does is respond differently now?

[rhdsirek4]

I believe what you want is the k20 belt off the 06+ SI. Thats the belt i have on my k24 swap, also using the k20a2 CP and have perfect tension.

Good work! Very good information.

[cyllarus]

Glad to help!

To me the change between the stock A3 pulley and A2 pulley was not about it "pulling harder" but more about a crisper throttle tip in.

Either way it DOES make a noticeable difference...

While cheap, its not the easiest mod, Honda estimates you need between 600-700 ft-lbs to break loose a crank bolt that has been on the car for a while. not easy to do while the motor is in the car.

[bchaney]

O ok... I thought he was sayin that a different serpentine belt causes the change in response.

The reason I went with the a2 pulley was to prevent overdriving accessories since my rev limit is higher than an a3.

[ep3hatchvcp]

I never thought that the pulley would make a difference at the top ive got a k24 pulley i believe with a k20 head so if i change it i will have better response?