kawiking Posted March 27, 2008 Report Posted March 27, 2008 how much compression do u run on your drag bikes >?? 300 ft sand /dirt drag bikes. on gas ?? Quote
rjatv Posted March 27, 2008 Report Posted March 27, 2008 how much compression do u run on your drag bikes >?? 300 ft sand /dirt drag bikes. on gas ?? Well myne has 205 pounds but alot of guys will say thats too high, but myne runs hard. Quote
KaosBanshee44 Posted March 27, 2008 Report Posted March 27, 2008 170/180 is what my buddy is gonna shoot for but i havne't hit the studies on it yet rico to be confident in what my answer would be. Quote
Geoff Posted March 27, 2008 Report Posted March 27, 2008 170/180 is what my buddy is gonna shoot for but i havne't hit the studies on it yet rico to be confident in what my answer would be. Yeah I've been told most like around 175-185. I know some run up higher but I've heard of guys popping o-rings and getting into detonations problems. Quote
okbeast Posted March 27, 2008 Report Posted March 27, 2008 I'm not sure you would tell much difference from 160-180 or so. I'm assuming your crank will be welded, so might as well shoot high, then when it gets into the hot texas summer months throw it on alky :biggrin: Quote
badassbanshee479 Posted March 27, 2008 Report Posted March 27, 2008 I have found on my 4 mil cub, 170 seems to be the sweet spot. I like to leave the comp alittle low and crank the timing. seems to come out of the hole harder! Quote
dajogejr Posted March 27, 2008 Report Posted March 27, 2008 Gas or alky, that's the question... My 4 mil on gas liked 185PSI and a TON of timing via the Dyna and Plate, on 110 and it ripped pretty good. I can't run that much compression on my 10 mil on alky. I just got new domes ordered, and it should put me around 175PSI or so. With alky, on a CUB, 165 to 180 seems to be the number. Cheetah cylinders can get away with more because the cylinder is Oringed, not the head... I got a new one piece head for mine, the domes pumped out 195 PSI or so and I popped an oring after 3 passes on the ice. When I ran my stocker cut and Oringed, no issues all year with 175 to 180 PSI. Dome shape and design vary from gas to alky...trust me on that one. Rico...reread, said you're on gas. Put it to 180 to 190, keep on giving it timing...you'll be amazed how much of a difference from 4 or 6 to 9 to 12 degrees makes. Ask badassbanshee....he finally caved in to my suggestion....LOL. Quote
kawiking Posted March 27, 2008 Author Report Posted March 27, 2008 i got a set of 20 domes from jeff.. i may get a set of 19's to test out to. im going to start my timing at 7 , ill be running vp c-12 race gas... i think 108 octane. im also alittle over 300 above sea level... ill prob run the 20's for the summer.. i plan on sending my cylns back to jeff this winter for some porting :biggrin: . i need to go F.A.S.T. :biggrin: i need to try and catch my buddies k&t 10 mill. Quote
dajogejr Posted March 27, 2008 Report Posted March 27, 2008 While I have a Dave Germain cleaned up/ported 10 mil, not a K&T motor, badassbanshee's 4 mil cub has NO problem staying right on my ass. We race as often as we can, and normally...it's who gets out of the gate is the winner. We've both been guilty of sleeping a time or two...lol. Quote
kawiking Posted March 27, 2008 Author Report Posted March 27, 2008 how many people run the dyna box ?? Quote
dajogejr Posted March 27, 2008 Report Posted March 27, 2008 Used to...sold mine to 375 banshee I believe.... I never had the time/resources to program and tune mine in. OEM works just fine for me.... Quote
Bansh-eman Posted March 27, 2008 Report Posted March 27, 2008 my cub has 185 psi. i also run the Dyna but i havent programmed it either. I just run it on curve 3 ( most advanced ) and +4 on the plate Quote
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