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ananthkamath · 6th April 2007, 03:04

I can tell from what I've seen of the following (talking more about how the car feels, not how much hp it makes):

4) Lightened flywheel

This will hurt on a stock engine. A lightened flywheel by itself will NOT increase RPM or HP. It will only increase throttle response at higher RPM (what is known as a livelier engine). If you add one to a stock engine, it wont rev any higher and will only lose torque in the low-end.

13) Cams

These can add anywhere between 10% to 20% by themselves. For the more extreme profiles, head work is mandatory. CR increase is mandatory or same effect as above will manifest itself.

My own take on this is:

The engine is a system. Unless you make everything work in harmony with everything else, you wont see any increases without losing somewhere else. The practical manifestation of this is that, if for example you "bolt-on" an intake, pod filter and exhaust, you will NOT see full gains unless you make changes to timing and carburetion. Similarly, if you bolt on a cam without throwing in an adjustable cam adjuster, you will NOT realize the full gains of the cam.

6th April 2007, 03:04	#9 (permalink)
ananthkamath BHPian Join Date: Jul 2005 Location: Dearborn, Michigan Posts: 988	I can tell from what I've seen of the following (talking more about how the car feels, not how much hp it makes): 4) Lightened flywheel This will hurt on a stock engine. A lightened flywheel by itself will NOT increase RPM or HP. It will only increase throttle response at higher RPM (what is known as a livelier engine). If you add one to a stock engine, it wont rev any higher and will only lose torque in the low-end. 13) Cams These can add anywhere between 10% to 20% by themselves. For the more extreme profiles, head work is mandatory. CR increase is mandatory or same effect as above will manifest itself. My own take on this is: The engine is a system. Unless you make everything work in harmony with everything else, you wont see any increases without losing somewhere else. The practical manifestation of this is that, if for example you "bolt-on" an intake, pod filter and exhaust, you will NOT see full gains unless you make changes to timing and carburetion. Similarly, if you bolt on a cam without throwing in an adjustable cam adjuster, you will NOT realize the full gains of the cam. __________________ Miata Turbo Is GO!!