5k Revs

[tas_ae71]

more rpm you use the smaller your engine life.

 

having said that, many factors which will factor engine life.

 

for a minute, forget all about rpm, look at engine specs and what a power/toque chart would look like if it was on a dyno. thats where you would want to keep the revs int the "sweet" spot where it makes most power.

 

tune the parts together to make power at around the same spot. so your cam profile, cam and ignition timing, extractor design/primary length should all reflect this. as a rule of thumb if you wanted high end power(8,000-10,000) you would need a very well balanced bottom end, very large cam with long duration (300-320) 4-1 extractors with LONG primary's. for a more conservative set-up you may chose 4-2-1 extractors with more normal length primary's so that it makes more power down low without absolutely strangling it at higher revs and a more mild cam, perhaps around 270 degrees.

 

also how do you want the engine to respond? do you want to go for outright power with nothing down low. also a lightended flywheel and correct tyre size/diff ratio will also effect how it performs quite a bit.

 

remember that while it maybe cool to have a super duper motor that can do a billion revs but if your going to be doing quite a bit of street driving rather than track then you may want to chose a setup that wont be a pig to drive. also you may experience poor fuel economy with little performance if you try and drive around like you would with a near stock motor.

 

yes stock manifolds and carb would make it feel more like a std one.

[beerhead]

Whats your base timing set at? If its about right, and its pinging when it advances I'd be looking at some fresh fuel.

 

  brendan said:

yeah i know it has a big cam but not sure on the size yet

 

it has an electronic dizzy

 

the advance is on but when its on it pings wen i take it off its alright

[brendan]

ill start at putting sidedrafts extractors and ill see how i go

 

thanks everyone for your help it made a hell of a difference

[Redwarf]

What fuel is it running on?

Edited August 27, 2008 by Redwarf

[brendan]

98 octaine

 

the most expensive 1