96x71 or 96x78 motor - That's the question |
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96x71 or 96x78 motor - That's the question |
KenH |
Jun 13 2006, 12:23 AM
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#1
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Senior Member Group: Members Posts: 680 Joined: 16-January 03 From: Gilroy, CA Member No.: 156 |
In playing with my el-cheapo dyno program it looks like you can get the same HP with either a 71mm or 78mm stroke. The 78mm however gives a bit more torque.
Over all the CAM seems to give the biggest improvement. The question is - is it worth the hassle to go to 78mm stroke (T1 rods, special pistons, clearence issues, cost of rods, crank, pistons) for 10'lb of torque?? Looks like 96mm x 71mm with good heads, proper CAM, optimun fuel delivery, FI or Carb, will make a pretty good motor. Comments?? Ken |
Mark Henry |
Jun 13 2006, 06:16 AM
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#2
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
I'm sorry but those desktop dyno programs are most of the time BS.
Just sticking a great big cam in an engine is about the biggest mistake an amateur engine builder makes. There is no replacement for displacement. and Your engine is only as strong as its weakest link. |
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