Skunk2 Racing Cams?
09-03-2006, 08:00 PM
#21
Registered User
Originally Posted by snakeeater,Sep 3 2006, 05:26 PM
Your math is wrong. You probably forgot that 4-stroke engines only inhale/exhale every other revolution. So your air flow calculation is too high by a factor of 2.
You know, as I was working it out, I had this strange feeling I was forgetting something really, really simple....
Like I said, I have a habit of screwing up...usually with the obvious
09-03-2006, 11:18 PM
#22
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In relation to the Honda Tuning article, I believe they state that they picked up power with the exhaust but it was too loud so they put in the silencers and switched the test pipe for a "high-flow" Magnaflow cat.
And they did dyno the cams -- the article, like many in Honda Tuning -- is just worded weird so it's hard to understand. They didn't dyno the header, they got that # from Skunk2 who said it got "up to 8hp" but failed to say where in the powerband the header's gains were.
And they did dyno the cams -- the article, like many in Honda Tuning -- is just worded weird so it's hard to understand. They didn't dyno the header, they got that # from Skunk2 who said it got "up to 8hp" but failed to say where in the powerband the header's gains were.
10-14-2006, 06:55 AM
#23
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I plan on getting Skunk2 cams, valves, retainers and springs this spring. I am currently at 220.02 Rwhp and 149 lbs of trq. at the wheels. I will have another dyno done after the install and supply an update.
10-16-2006, 04:41 PM
#28
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Originally Posted by jakub2000,Oct 15 2006, 02:15 AM
My exhaust cam went bad last Friday so I might look into this as well. How much longer for Crower?
thats kinda odd isnt it?
10-17-2006, 05:01 AM
#29
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Originally Posted by versionJDM,Oct 16 2006, 08:41 PM
thats kinda odd isnt it?
10-17-2006, 06:07 AM
#30
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Jakub,
Are you still turbocharged? If so, I would be very careful researching cams. Avoid long duration, long overlap (time when both intake & exhaust valves are open) cams. They are made for hi RPM power on N/A engines.
The best turbo (and nitrous) cams usually have conservative overlap, centerline, and duration numbers, compared to a race N/A cam. Since we have separate intake and exhaust cams, you can dial back aggressive centerline and overlap to something better suited to S/C application, if you get adjustable cam gears.
The intake is under boost, so it doesn't need huge duration to get flow. The exhaust is blowing down with much more cylinder pressure. So you don't need excessive duration on the exhaust lobes.
If intake is open for too long while exhaust is still blowing down, the higher pressure exhaust will flow back towards the intake, polluting the fresh air/fuel charge.
Are you still turbocharged? If so, I would be very careful researching cams. Avoid long duration, long overlap (time when both intake & exhaust valves are open) cams. They are made for hi RPM power on N/A engines.
The best turbo (and nitrous) cams usually have conservative overlap, centerline, and duration numbers, compared to a race N/A cam. Since we have separate intake and exhaust cams, you can dial back aggressive centerline and overlap to something better suited to S/C application, if you get adjustable cam gears.
The intake is under boost, so it doesn't need huge duration to get flow. The exhaust is blowing down with much more cylinder pressure. So you don't need excessive duration on the exhaust lobes.
If intake is open for too long while exhaust is still blowing down, the higher pressure exhaust will flow back towards the intake, polluting the fresh air/fuel charge.
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