QUOTE (Backcountry @ Dec 17 2008, 09:43 AM)
index.php?act=findpost&pid=21100Something in the 44mm range would be good. As some have mentioned a good balance between a carb that is easy to tune and still will work well on the top end.
As for your compression. Maybe I'll be a bit frank here and perhaps even a little pointed. You have a $10,000 motor, now is not the time to start taking short cuts on set-up. You really should know what compression RATIO that motor is. To me there is an apparent absence of any knowledge of the configuration of that motor- thats not necessarily a bad thing if you had professional engine builder do all the set-up for you based on their testing and proven outcome. But when its bad is when someone buys a motor and starts making changes without even knowing where they are starting from.
Its the cutting edge of Banshee performance currently and its not your average 350 duner. As such you need to make sure your set-up is correctly done in an effort to prevent a catastrophic failure. Head geometry is crucial to that- with that much bore and stroke there is little wiggle room to get it wrong. You must know what the compression RATIO is- such a large motor will typically not tolerate much above 15:1(gas) & 16:1(methanol). If you start jacking the compression around to try to establish some mythical PSI reading- you may very well wind up with a failure. The massive stroke and bore of that set-up will need to have increased squish clearance, reduced MSV values, and a moderate compression ratio. Get on Ebay and find a burrette tube. Then. Many thanks to one of my mentors Howard Richards of RED- here's a nifty link to an article on how to calculate your UCCR:
http://www.sacoriver.net/~red/uccr.html
That much bore and stroke will make plenty of torque- risking $10K on trying to squeak another few HP out of it by putting it on the edge of detonation with a high and perhaps even unknown compression ratio......
you wont win planetsand that way.....
