Are there any major horsepwoer gains by getting the head port and polished? I have talked to Portflow in CA and they said that they have only PP'ed one head and that was for DC Sports. They could not give me any figures as far as how much they gained. Will it hurt the performance of the S2000 if this is done? I appreciate your responses

 

Try this site.
http://beta.vtec.net/articles/view-article...article_id=6500

 

So that "head project" has been going on for what, 10 months now? Sheesh.

 

Well Jim, when you find someone (a top quality porter) who gives you free flow bench time and free porting work to develop a brand new head, tell me how long it takes you. After the initial investment, which several members here chipped in for, we had to spend an additional $250 on an intake manifold, $500 more on valves (of varying sizes, etc.) and a couple hundred $$ on new valve seats. All told, I have about $1000 of my own money in this, and VTEC.net was kind enough to put almost that much in. And the porter has not only put in a lot of free time, but he's also gone through several hundred $$ in porting supplies that he hasn't charged me for. Oh, and this project is an after hours affair - but hey, what do you care, right?

We've spent over 75 hours porting or on the flow bench and made over 150 passes on the bench with different modifications. We've got a couple final things to try out (about one day of testing), but we've managed to find gains of nearly 10% flow on both the intake and exhaust.

UL

 

You have to remember...people who work on cars don't believe in calenders. The only reference of time they know is tomorrow.

 

UL,

I've been watching the port project with anticipation since it was still in the "talk about" stage. Will the improved airflow hinder, improve, or be a draw for FI applications? I'm assuming it can only help, but thought I would ask, just in case...

 

I checked out the referenced site. Sorry to say it, but a SF 110 is not exactly state of the art. 10" H20 does not provide adequate flow to base port modifications.

Ozzie

 

Ozzie,

I don't need to defend anything UL does, as he's more than capable of that, but the SF110 is just fine for testing the F20C head, as it's rated to 185 CFM and the head flows about 150 CFM (intake) stock. The only thing that you should not do is compare readings from a 10" flow bench to a 25" bench. As long as UL and his team continue to compare this head on this bench, AND they do not approach 185 CFM of flow (they probably won't, and if they do, I'm changing head shops!) then this test is perfectly valid and, thanks UL, VERY MUCH appreciated.

Jim Mullen

 

We'll agree to disagree. In my experience, flow at 10" does not come close to approximating flow characteristics at higher pressure drops which is where the engine lives. I have worked with a pro stock motorcycle team in the past and they used an SF600. Even this flowbench was marginal for an 1100cc engine (we tested at 28" and 36"). Flames neither implied nor intended.

Ozzie

 

My head was ported and polished by Alaniz and is now running on my engine (am I the first?) I have oversized valves and awesome exhaust flow... The turbo is now spooling at idle, it's pretty rediculous!! Very cool, I can't wait to see how fast the turbo spools to 15 psi on a dyno. (Very soon)

Chris