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GENERAL => DRAG RACING => Topic started by: Vrace on November 13, 2005, 01:49:59 PM

Title: What cams on a 1507cc dragbike busa with lectrons??
Post by: Vrace on November 13, 2005, 01:49:59 PM

I need an opinion.
What cams must be use on a 1507cc busa dragbike with 44mm lectrons and Dyna electronics?
I have webs .415/.395 and the bike lost power over 10.700 rpm. I want power over 12000 rpm.
The bike has the  stock valves on the cylinder head. Oversize valves help for my problem?

Title: Re: What cams on a 1507cc dragbike busa with lectrons??
Post by: DarkFalcon on November 13, 2005, 03:00:31 PM

I would go with 34mm valves and an intake with at least .431 lift....you might sneak by with a .425... and a duration of around 255 @ .04 or 1mm. Use the current intake on the exhaust. The current set-up cannot keep up.....the window time/area is inadequate. I would suggest that the exhaust valve should be increased by 1mm as well. Get other opinions as well.

Title: Re: What cams on a 1507cc dragbike busa with lectrons??
Post by: Vrace on November 13, 2005, 04:54:44 PM

what is the duration at 0.40 of .415/.395 web cams

Title: Re: What cams on a 1507cc dragbike busa with lectrons??
Post by: gnd111 on November 13, 2005, 07:30:43 PM

Maybe these cams...

445/415 WeB Cams setup...

Title: Re: What cams on a 1507cc dragbike busa with lectrons??
Post by: DarkFalcon on November 13, 2005, 08:05:26 PM

Quote from: Vrace on November 13, 2005, 04:54:44 PM

what is the duration at 0.40 of .415/.395 web cams

244I and 242E, both @ .05. To convert to .04, add 4 or 5 degrees of duration though it depends upon ramp design. The different rod ratio makes the case for the longer intake.