Headwork for 300HP D??
11-09-2007, 09:21 PM
#24
0.0 BAR
Join Date: Nov 2006
Posts: 0
Re: Headwork for 300HP D??
Originally Posted by Schwitzer Turbo
I would Tend to Agree with that, but i know alot of honda people say the Honda Head's are already workedto the MAX?
Is this true? and how would you flow a N/A differnt to a F/I car or are they all one and the same?
Is this true? and how would you flow a N/A differnt to a F/I car or are they all one and the same?
There was a few good write-ups on DIY head porting floating around on the internet.
11-09-2007, 09:36 PM
#25
0.0 BAR
Join Date: Dec 2002
Posts: 0
Re: Headwork for 300HP D??
Originally Posted by wafflesincars
That is kind of true in relation to most B-series heads, but for our economic D-series heads they can use a bit of work rounding out the 90 degree bend in the exhaust ports. You can always improve flow by smoothing out the edges left by the casting process.
There was a few good write-ups on DIY head porting floating around on the internet.
There was a few good write-ups on DIY head porting floating around on the internet.
11-09-2007, 09:38 PM
#26
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Join Date: Dec 2002
Posts: 0
Re: Headwork for 300HP D??
also the diy port work write ups are for v8 heads not the efficent Honda heads. Gains in port work from an unexperinced person just grinding expect nothing. Guy behind a flowbench etc is when power is found.
11-09-2007, 10:04 PM
#28
0.0 BAR
Join Date: Nov 2006
Posts: 0
Re: Headwork for 300HP D??
Originally Posted by chris
Very untrue. The exhaust ports on dohc vtec heads re-act huge to work. Expect 25 whp+ . All Honda heads are hardly maxed out that is just the truth.
Originally Posted by chris
also the diy port work write ups are for v8 heads not the efficent Honda heads. Gains in port work from an unexperinced person just grinding expect nothing. Guy behind a flowbench etc is when power is found.
11-09-2007, 10:11 PM
#29
1.5 BAR
Thread Starter
Join Date: Oct 2005
Posts: 752
Re: Headwork for 300HP D??
Originally Posted by chris
I purple power tank all my motor parts overnight. Power washed look very nice. Stuff will eat up your hands wear gloves.
After reading all the replies I think a stock rebuild is the best way to go for now, although I'm still tempted to get a cam.
11-09-2007, 10:26 PM
#30
3.0 BAR
Join Date: Mar 2004
Posts: 1,729
Re: Headwork for 300HP D??
Originally Posted by wafflesincars
Actually the write-up was for a B16A, and I should have been more specific. They aren't any where near maxed out, especially the VTEC exhaust ports , because of that conjugal routing against the coolant passages in the head but they don't require major reformation of passages like some VW and V8 heads. You won't see gains from hogging out the ports in stupid proportion. Mainly what Honda heads benefit from is forming passages that promote venturi effect in specific places, like exiting the port where the exhaust gas should be accelerated into the header where the venturi effect should be continued, or even better right into a turbine
