Longevity no balance shafts
I have done a ton of reading and studying on the balance shaft delete idea. This is a short summary of my findings and others opinions with BSE. Some of this info came from right here on TGC, many other sites and of course my own motors.
pros-
frees up horsepower because of less rotating mass
fewer moving parts = more reliability
no chance the weak tiny belt can break and tangle in the main timing belt.
cons-
-more vibration feel to driver/passengers,doesnt affect internal balance of
engine.
-some say the rear stub puts to much stress on pump and pump wears
prematurely.
-no oil groove on some replacement stub shafts caused damage in short
period of time.
-to high of oil pressure because of blocked ports
I have seen and read a few methods of accomplishing this, not saying I agree or disagree with any particular one but here they are.
1.simply remove small belt.
-problem with this is you still have a shaft with weights and no other to counteract it and you have shaft rotating at 2x the crank rpm.
2.leave front shaft in place or remove shaft and turn bearings around.
-if you are taking the cover off might as well send a few more minutes and take a few pounds off the motor and block those holes.
3.remove rear and replace with stub shaft or turned down original.
- I was planning on turning the stock shaft down on a lathe until I looked at the surface the shaft rotates on the pump, mine only has 100k on it. I was thinking it was the best way to go as it was supported by 2 bearings this way. Since the bearing contacts are on two different components the chances of getting a perfect alignment is slim I have since changed my mind and am putting a good quality mitsubishi stub shaft in as well as a new oil pump.
Heres the wear on mine.
http://i1225.photobucket.com/albums/...r/IMG_1311.jpg