slapaho Posted April 1, 2004 Report Share Posted April 1, 2004 i was told with 15cc domes i wouldnt have any topend without a port job is that true Quote Link to comment Share on other sites More sharing options...
bkabina Posted April 1, 2004 Report Share Posted April 1, 2004 Yep. Quote Link to comment Share on other sites More sharing options...
slapaho Posted April 1, 2004 Author Report Share Posted April 1, 2004 would 17cc domes be better Quote Link to comment Share on other sites More sharing options...
bkabina Posted April 1, 2004 Report Share Posted April 1, 2004 What are your mods and elevation? Quote Link to comment Share on other sites More sharing options...
slapaho Posted April 1, 2004 Author Report Share Posted April 1, 2004 right now i have a milled haed wiseco pistons 7 degrees in timing v force reeds pro design intakes 35.5 ftz carbs and toomey tg pipes pretty close to sea level and have 16 40 gears Quote Link to comment Share on other sites More sharing options...
350duner Posted April 7, 2004 Report Share Posted April 7, 2004 What is your compression right now? Quote Link to comment Share on other sites More sharing options...
MULLET~BOY Posted April 7, 2004 Report Share Posted April 7, 2004 if your going for more top end you don't want a tone of compresion probably around 180 psi Quote Link to comment Share on other sites More sharing options...
Aussie Quad Racer Posted April 8, 2004 Report Share Posted April 8, 2004 both too much timing and compression will rob you motor of top end horsepower. It will not allow your motor to rev out freely. How do you know when it has too much? well that all depends on the tune of the rest of the engine and the only real way to know is dyno it. Quote Link to comment Share on other sites More sharing options...
BakoBanshee Posted April 12, 2004 Report Share Posted April 12, 2004 i was just thinking, if someone were to run 15cc domes and port the jugs to allow some over-rev, wouldn't you have a power-band that had a pretty broad power curve? Does anybody run 15cc domes and if so how is the bottem-end power? Quote Link to comment Share on other sites More sharing options...
Aussie Quad Racer Posted April 13, 2004 Report Share Posted April 13, 2004 you do not understand compression and exhaust port duration, raising the exhaust port reduces static compression but when under load at high revs, it will have more compression due to better signal (within a small rpm range) at the port drawing more fuel into the cylinder and pushing unburn gases back into the cylinder Quote Link to comment Share on other sites More sharing options...
Josh A. Posted April 15, 2004 Report Share Posted April 15, 2004 Do the big carbs slow you down with no porting?the only motor id run 15s on is an alky FULL out 350 with a pvl, drag port it and get a pvl then you can use all that compression Quote Link to comment Share on other sites More sharing options...
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