NR 91 First start

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That is plenty of heat. Just takes time.

A better way is to pull the shaft out of the motor. That way the log does not get hot.
 
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I have erased alot of the data for the 91 i would have to measure again..

But my engine has 188.5 exh and around 132 trans if i remember.. The blowdown around 27.5 ..which could be raised a little.
looks like blow down is 57. 188-132=57.a little low but i would try it.also depends on what rotor timing looks like.i really like to know how well these big alum rod motors will hold up.
 
micheal this is new motor mods for my 91

raisred sleeve .0.008thou

exh - 188.7

trans - 136

rotor open 214

rotor close 70-- cut 4 degrees more

squish 0.013" 9.4CR

216 duration

havent tested yet ...
 
Last edited by a moderator:
micheal this is new motor mods for my 91

raisred sleeve .0.008thou

exh - 188.7

trans - 136

rotor open 214

rotor close 70-- cut 4 degrees more

squish 0.013" 9.4CR

216 duration

havent tested yet ...
micheal this is new motor mods for my 91

raisred sleeve .0.008thou

exh - 188.7

trans - 136

rotor open 214

rotor close 70-- cut 4 degrees more

squish 0.013" 9.4CR

216 duration

havent tested yet ...
Thanks gents..
 
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