After having some spare time on my hands, I decided to throw the f20b cams in my car, retune it, and redyno it.

The car is fully built with a 87mm bore and 88mm stroke. The head uses 1mm oversize valves with full valvetrain, etc. Both dyno runs were done at 12-13psi on 94octane pump gas. Full vehicle information can be seen on my website (http://www.preluderacing.com).

No changes were made to the setup other than the cams.



The red line represents the stock h22 cams while the blue line represents the f20b cams (which are the same as type-S cams). In addition, the runs were done on different days, so the temperature/humidity conditions of the runs were different (f20b runs being done in ambient air +13deg hotter).


Modified by XES at 11:30 PM 5/30/2007

 

very cool comparison, looks like the h22 cams spools your turbo a bit sooner, i mean that could also be the different air temps... were these numbers SAE corrected? if so then the correction factor would take into account the different air temp.

 

Nice #'s brad.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelittlelude &raquo;</TD></TR><TR><TD CLASS="quote">very cool comparison, looks like the h22 cams spools your turbo a bit sooner, i mean that could also be the different air temps... were these numbers SAE corrected? if so then the correction factor would take into account the different air temp.</TD></TR></TABLE>

The h22 cams are going to go back in the car. Then i will play with the cam gears and see what i can extract. It is definately a good comparison though SAE numbers appear the same at the bottom of the graph, but the conditions by no means are the same.

 

are you 100% surwe they were 5 speed cams(f20b)
crazy number anyway,

makes me want to boost the f20b lol

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by machine4321 &raquo;</TD></TR><TR><TD CLASS="quote">are you 100% surwe they were 5 speed cams(f20b)
crazy number anyway,

makes me want to boost the f20b lol

</TD></TR></TABLE>

Yes 100%. Both sets of cams were measured and spec'd. They are Type-S/f20b NA manual cams. They matched up to exactly what was listed by Crower. http://www.crower.com/cat/impo...shtml

 

good test man, the results are exactly as expected, the h22 cams make good low end/midrange and spool the turbo faster, while the peakier f20b/type-s cams make better power up top

good stuff

 

good ...numbers....all i can say is "WOW"

 

Here is a dyno vid with the f20b cams...

http://www.livevideo.com/video....aspx


Modified by XES at 1:43 AM 5/31/2007

 

thats awesome man. who makes that manifold by the way?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bluedlude &raquo;</TD></TR><TR><TD CLASS="quote">thats awesome man. who makes that manifold by the way?</TD></TR></TABLE> If you are talking about the turbo exhaust manifold...i did. It took way too long and I probably would never do it again.

 

its all nice...good vid and everything. Keep up the good work.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by XES &raquo;</TD></TR><TR><TD CLASS="quote">After having some spare time on my hands, I decided to throw the f20b cams in my car, retune it, and redyno it.

The car is fully built with a 87mm bore and 88mm stroke. </TD></TR></TABLE>

so is this an h22 block with f20 parts in it, or a h22 head on a f20?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by prelittlelude &raquo;</TD></TR><TR><TD CLASS="quote">

so is this an h22 block with f20 parts in it, or a h22 head on a f20? </TD></TR></TABLE>

I am using an f20b block, sleeved by Benson, with 87mm pistons (similar to h22), custom Crower f20b rods and an f20b crank. This is then combined with an h22a4 head.

The 2 dynos were done on that setup...except one run had stock h22 cams while the other had stock f20b (type-s) cams