QuestionI have a 1965 MK2 in which I would like to get more power out of. I realize that it never had a lot of power to begin with but I don't think I have been able to achieve what it once had. The compression at 3000 rpm is 130 psi across all cylinders, I have adjusted the carbs (I live @ 9000 ft in CO)I have timed it the best I can get it.
So long story short now, what can I do to get more power out it?
Answer1) upsize the carbs or go to side draft weber
2) go to an exhaust header rather than stock cast manifold
However, while the above two can be done in absence of uprating the engine, you gain more by building an engine for more power (different cam & compression ratio)
1) higher lift cam/fast road cam vs. stock will improve power
2) increase compression ratio (shave head) will increase power
but that will drive a need for premium gas, and put more stress on the engine, so if you haven't rebuild the engine, by changing the case & head may lead to other issues.
Compression is usually measured in two ways, compression while cranking, and a leakdown % by cylinder. I've never heard of measuring compression while the engine is running, but what do I know? COmpression is more of a go/no-go measure, as it, itself, doesn't tell you much. Leakdown is a more valid measure, as it tells you how much blowby you have of the rings, which is what will reduce your power.
Measure you compression cranking when the engine is cold (pull out all 4 plugs) and see what those #s are. Borrow someone's leakdown testers, and see what % blowby you have.
Your first best step may be a rebuild.
