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Replacement oil pump?

If I remember correctly, the 1100 is a roller-bearing engine.
In that case, a "high-pressure" oil pump would only need 15-20 psi to qualify.

These roller-bearing engines only need large volumes of low-pressure oil flowing through the rollers to keep them cool. They have enough pressure to keep the cams from touching their bearings, but don't need the 60 pounds or so that we are used to seeing in car engines.

I don't see a pressure spec in my Clymer manual, but I think it is in the 7-12 psi range.


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Just remove the stock oil pump gears and replace with gears from a GS 750 4 valve model. I think most guys that race with a gs motor do it.
 
rosco15 said:
Just remove the stock oil pump gears and replace with gears from a GS 750 4 valve model. I think most guys that race with a gs motor do it.
Click to expand...

The gears from the 2 valve 750 motor will also work.

Hap
 
Just thought that I might remind you that the LT is a chain drive 16 valve motor. My only concerne is getting enough oil to the top end.
V
 
gustovh said:
Just thought that I might remind you that the LT is a chain drive 16 valve motor. My only concerne is getting enough oil to the top end.
V
Click to expand...

Yep, I got an '81 1100E, same motor. There is no way to put a "high pressure" oil pump on the motor. It's a matter of volume, thus the use of different gears to increase the amount of oil flowing, not the pressure. Kind of like when you have a garden hose with no nozzle - you can keep opening the water valve, more water keeps coming out but the pressure doesn't increase much, if at all. The only way to increase pressure would be to place restrictions in the oil galleys and that is counterproductive to what you want.

The 16 valve 750 motor, while it looks VERY similar to the 16 valve 1100 motor, has an entirely different oil system. Because it uses plain shell crank bearings, it requires a high-pressure oil system.

If you want to insure oil is getting to the top end, you could put a top end oiler on your bike but that will only help you if you've installed larger diameter cylinder stud bolts. If you have not modified the motor, you are probably getting more than enough oil to the cams unless something else is wrong.

Hap
 
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