quick question about cams in general
#1
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One time I read that preformance cams were a
trade off of wrere to put the power, take some
off of the top and place it on the bottom, or take
some off of the bottom and place it on the top.
Wouldn't stock cams give the best of both worlds,
for touring or does that idea go out the window
when the compression gets up around 10.5:1?
trade off of wrere to put the power, take some
off of the top and place it on the bottom, or take
some off of the bottom and place it on the top.
Wouldn't stock cams give the best of both worlds,
for touring or does that idea go out the window
when the compression gets up around 10.5:1?
#2
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It's a combination of things really. When static compression is increased, the intake valve close typically needs to be delayed. That's how bolt in cams move the power curve around on an otherwise stock motor. Earlier close = increased ccp and a torque curve shifted to the left. Stock cams are pretty much limited to stock compression on a 96 or 103 due to the early intake close and short duration, and IMO a big bore upgrade should have a new cam installed. I know some other motorheads will chime in, but that's just the basics of it.
#5
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Actually you can increase hp and tq with the right cams in a stock engine. Then you do need to decide your riding style as to where you want the most gain, low end grunt or top end pulling. Static compression really identifies what cams to run as cams with long duration and overlap bleed off cylinder pressure, so the bigger the cam, the higher the static compression needs to be to keep cylinder pressures up and for the engine to retain some civility in the lower rpms.
Keep readin, become well educated regarding cams and how they interact with other items in the build. I have seen many more "over-cammed" engines with riders complaining of rideability issues than people complaining that they did not go big enough with the cam.
Keep readin, become well educated regarding cams and how they interact with other items in the build. I have seen many more "over-cammed" engines with riders complaining of rideability issues than people complaining that they did not go big enough with the cam.
Last edited by Dalton; 08-31-2009 at 07:19 PM.
#6
#7
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Couple of points:
1. Stock cams are not the best - they're the cams the MoCo need to put in to get through EPA and noise tests.
2. Stock cams give a reasonable all round performance - but if you want more in the mid-top (like me) then losing a bit below 2500 is no big deal as I never run the engine there (except on my way to the higher revs)
3. Analyse where you might want more and where you might want to give some up, also analyse your riding style - what revs do you usually ride at.
1. Stock cams are not the best - they're the cams the MoCo need to put in to get through EPA and noise tests.
2. Stock cams give a reasonable all round performance - but if you want more in the mid-top (like me) then losing a bit below 2500 is no big deal as I never run the engine there (except on my way to the higher revs)
3. Analyse where you might want more and where you might want to give some up, also analyse your riding style - what revs do you usually ride at.
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#8
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Some good info above. This compliments a lot of what has been said about cams, choosing the right cam for your riding style, and the other components that make up a reliable build.
http://www.americanrider.com/output.cfm?id=1054045
http://www.americanrider.com/output.cfm?id=1054045
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