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Old 06-11-2009, 12:28 AM
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NA SOHC F23A1 Build - DYNO'd!!!

Ok, so this is one of three die-hard "Naturally Aspirated" F23A1-VTEC builds happening through 6GA forum. Everyone has something different they're trying out; thanks to AFAccord again for his feedback & shared info.

Mine kinda took a different route thanks to "michaelp4283" (200whp or bust) who supplied the piston kit:

Forged Wiseco 86.5mm (-5) piston and ring kit (custom)
Compression will be about 10.69:1
KaizenSpeed "Balance Shaft Eliminator" kit installed.
Crank was balanced, of course.

The head is another fresh one I picked up locally:

No milling
Ported intake & exhaust to match stock gasket
Bisimoto Valve spring kit and stock valves and retainers.
Flow tested head @287cfm.

I'm also using the same WebCamshaft (custom regrind) that was used to dyno car last time.

The intake is an F23 ported to match and the upper TB/Housing was also ported to match my 68mm TB.

Basically, more compression, no balance shafts, home-made intake/head work and spring kit. ???whp - we'll see soon! Updated 2/16/10

UPDATE: 2/17/2010 - 171wtq/174whp

For those who still wonder (=200tq/203hp) at 17% drivetrain loss.


The gain is from the green curve to aqua curve. I gained a bit over 20whp and 18wtq. Basically, my intake is all out of vacuum and restricting flow. My fuel is already at peak so if I change my intake or modify somehow to flow more, I'll need injectors and fuel pump. For now, it is what it is. I/m happy with results. The engine wants more so that's a good thing, more room for improvement.

Thanks for following up with this thread everyone, I hope it helps shine some light for a few and helps others make other improvements.

Here's a peek!

http://www.youtube.com/watch?v=R6Z-x0MUc1c













Good luck to everyone else trying to pull max ponies out of these motors!

Last edited by NASOHC; 02-23-2010 at 09:40 PM.
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Old 06-11-2009, 12:48 AM
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Re: NA SOHC F23A1 Build

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Old 06-11-2009, 12:49 AM
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Re: NA SOHC F23A1 Build

Nice dude GL w/ install and lets see those numbahs ASAP
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Old 06-11-2009, 01:04 AM
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Arrow Re: NA SOHC F23A1 Build

Wow man I can't wait to see the results!
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Old 06-11-2009, 01:30 AM
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Re: NA SOHC F23A1 Build

goood luck to you man can't wait to see the end results
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Old 06-11-2009, 01:58 AM
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Re: NA SOHC F23A1 Build

I love these threads, you and AFAccord lol, and I just stumbled across michaelp4283's today. Good luck to you man.

I'm going to pick up an h23 IM next week for pretty cheap off craigslist, and hopefully a skunk2 70mm TB along with it. That way, every time I go in my garage I'll have to look at them, thus forcing me to read more of these threads til I'm comfortable enough to do something with them
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Old 06-11-2009, 09:21 AM
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Re: NA SOHC F23A1 Build

good luck

im sure that either one of you two can get the 200whp n/a
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Old 06-11-2009, 10:21 AM
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Re: NA SOHC F23A1 Build

Props and good luck achieving your power goals, I'll be following this thread closely....
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Old 06-11-2009, 02:26 PM
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Re: NA SOHC F23A1 Build

yeah! looks nice! please do post your head flow numbers.
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Old 06-11-2009, 07:40 PM
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Re: NA SOHC F23A1 Build

You better give me a ride!
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