throttle body size chart...

[stolle]

werd:

http://hondaswap.com/reference-material ... art-29095/

Honda Throttle Body Sizing Chart

Inside Diameters (in mm) measured at the butterfly/intake manifold side

* d15b6 - 46
* d15b7 - 56
* d16a6 - 55
* d16y7 - 56
* d16y8 - 56
* d16z6 - 56
* ZC - 55
* d16a1 - 55
* d16a8 - 55
* b18c1 - 60
* b18c5 - 62
* b18a - 58
* b18b - 60
* b16a SiR - 58
* b16a Sir2 - 60
* b16a2 - 60
* b16a3 - 60
* b20b - 60
* b20z - 60
* h22a - 60
* h23a - 60
* f20c - 62
* f22 - 60
* f23 - 60

[Spork]

good chart to add:


basically, it shows the increase in airflow of each throttle body over a stock 1st gen b16a throttle body (58mm).
All throttle bodies are measured at the butterfly plate/intake manifold side.
Also note: the "Spoon 70mm" is not a typo, the 70mm measurement is taken at the tip of the intake to the throttle body. the unit tapers from 70mm down to 62 at the butterfly.

[ObsesionWitSped]

So, with that chart, if you move up to a B18C Type R TB from a B18C..you should technically see an increase of 7.8%? Anything else need to be done to see the full 7.8%(if that) increase in air flow?

[Kage87]

So, with that chart, if you move up to a B18C Type R TB from a B18C..you should technically see an increase of 7.8%? Anything else need to be done to see the full 7.8%(if that) increase in air flow?

Given the same air box/air intake yes, the air threw the throttle body would be 7.6% higher with the 62mm TB than with the 60mm TB. That doesn't equate to the same power though, the are quite a few more variables to take into consideration for that to happen ie. intake mani, cams, and runners in the head to name a few.

[deetz]

port to match.. theres going to be a lip where the t/b mounts to the intake manifold.. so id recommend belling the entrance on the intake out

[HondasX2]

can you go to big of a throttle body...for example if you have an itr (62mm) would 70 be to big if you did get new mani and stage 2 cams??? and would it be worth it at all? i know you would need to port match aswell...

[Spork]

can you go to big of a throttle body...for example if you have an itr (62mm) would 70 be to big if you did get new mani and stage 2 cams??? and would it be worth it at all? i know you would need to port match aswell...

absolutely you can go too big. with just a manifold and "stage 2 cam" (which could still mean ANYTHING since every manufacturer is different) I probably wouldn't consider going anywhere over a 68 (for a b-series)...and I would think a 65 would probably work just fine. it all depends on WHERE you want to make your power, and how high you are comfortable revving the motor.

[HondasX2]

absolutely you can go too big. with just a manifold and "stage 2 cam" (which could still mean ANYTHING since every manufacturer is different) I probably wouldn't consider going anywhere over a 68 (for a b-series)...and I would think a 65 would probably work just fine. it all depends on WHERE you want to make your power, and how high you are comfortable revving the motor.

Well I was planning on the red line being right around 9...and I have the skunk 2 stage 2's but wat would be the pros and cons between the 65 and the 68wanna make...the cams power comes into play at high rpms...I mean I would really like to have the power in the mid to high range because obviously low range does not want to give me any traction

[nomoneyleft]

great info thanks for the poast

[erming]

So i just ordered a 68mm for my b16 what can I expect from it and would bigger be better if I was going to turbo it???