anyone know some tips or know a link for some about porting an intake manifold for the S2000. ive read some stuff before about how header ports should be larger than the exhaust ports on the cylinder head. wondering if this is true for he intake side. i wanted to work on this as a home project, boring out the throttle body port and intake ports. this will be meant for a vortech'd S2000 with a bigger throttle body. thanks in advanced

- jerry

 

from what I've heard, and I've talked to one of the best porters in the country, there are almost no gains to be had from porting the intake manifold.

Blake

 

What about extrude honing the intake manifold? I've heard that did a lot for other Hondas.

 

not this one. its been done a few times and notta, zilch.

 

what about on forced induction?

 

Rev, are you sure about the intake needing to be larger than exhaust? I have no idea, but it seems counterintuitive. You ram in X% of dense, cold air into the intake, then add fuel, spark, and a large explosion, creating a very hot, and MUCH less dense air charge (well, OK, the air still takes up the same volume, but the higher heat makes it WANT to take up more volume). That being the case, I would want a larger exhaust than intake to get rid of the extra volume of air. Anyone confirm/deny?

 

Check out http://beta.vtec.net/articles/view-article...article_id=6500 There is more to it than just porting and polishing. You have to know where and how much. It is a very exacting art/science and the few who know how to do it get $1500 to $3500 to do a head correctly.

 

You guys can try and find Shaner's post on this. To sum it up for those to lazy to search he did it on his Comptech SC S2000 and got zilch with the extrude hone process. In fact if memories serves me right he had a terrible experience with the whole ordeal. They took a longer then promised turnaround time.

 

what i meant was.....

i knwe on the exhaust sided, the header port should be larger than the exhaust side on the cylinder head.....i didnt know if this was true about the intake side.....

not that the intake ports had to be larger than the exhaust side..

just to clarify

 

Dear S2000ophiles,

Common head porting practice is to have the header pipes larger than the head port outlet so there is a step up in diameter as the gas leaves the head. This is said to help scavenging, and prevent pressure waves going back into the cylinder.

On the Inlet side, normal practice is to have the manifold matched to the head ports so there are no steps in diameter.