 96x71 or 96x78 motor - That's the question |
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| KenH |
 Jun 13 2006, 12:23 AM
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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 |
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| KenH |
Jun 13 2006, 05:36 PM
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Senior Member Group: Members Posts: 680 Joined: 16-January 03 From: Gilroy, CA Member No.: 156 |
This is the set-up.
96mm pistons 44 webbers - 36mm venturie 4 to 1 headers, Phase 10 muffler WEB CAM 86 - not firm on this yet Heads upgaded to 44 x 38 So is it worth $1000 to go to a 78mm crank over the 71mm crank?? This comment below needs more to go with it to be of value. "There is no replacement for displacement. and Your engine is only as strong as its weakest link." Ken |
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Posts in this topic
KenH 96x71 or 96x78 motor - That's the question Jun 13 2006, 12:23 AM
So.Cal.914 Torque is nice but the shorter stroke is going to ... Jun 13 2006, 12:36 AM Twystd1 It really depends on your end result.
What are yo... Jun 13 2006, 01:22 AM Mark Henry I'm sorry but those desktop dyno programs are ... Jun 13 2006, 06:16 AM anthony Raby has graphs posted for all his engines at www.... Jun 13 2006, 06:08 PM BMXerror "There is a replacement for displacement. It... Jun 13 2006, 06:23 PM
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