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Is there a high pressure replacement oil pump for a 80 1100 LT?
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Gustov
80 GS 1100 LT, 83 1100 G "Scruffy"
81 GS 1000 G
79 GS 850 G
81 GS 850 L
83 GS 550 ES, 85 GS 550 ES
80 GS 550 L
86 450 Rebel, 70CL 70, Yamaha TTR125
2002 Honda 919
2004 Ural Gear up -
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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mine: 2000 Honda GoldWing GL1500SE and 1980 GS850G'K' "Junior"
hers: 1982 GS850GL - "Angel" and 1969 Suzuki T250 Scrambler
#1 son: 1986 Yamaha Venture Royale 1300 and 1982 GS650GL "Rat Bagger"
#2 son: 1980 GS1000G
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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.Comment
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I'm running a Star Racing high volume oil gears on my 80 GS1100L. I bought it off Ebay so I'm not sure if they still make it.
1983 GS 1100E w/ 1230 kit, .340 lift Web Cams, Ape heavy duty valve springs, 83 1100 head with 1.5mm oversized SS intake valves, 1150 crank, Vance and Hines 1150 SuperHub, Star Racing high volume oil pump gears, 36mm carebs Dynojet stage 3 jet kit, Posplayr's SSPB, Progressive rear shocks and fork springs, Dyna 2000, Dynatek green coils and Vance & Hines 4-1 exhaust.
1985 GS1150ES stock with 85 Red E bodywork.
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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.
VGustov
80 GS 1100 LT, 83 1100 G "Scruffy"
81 GS 1000 G
79 GS 850 G
81 GS 850 L
83 GS 550 ES, 85 GS 550 ES
80 GS 550 L
86 450 Rebel, 70CL 70, Yamaha TTR125
2002 Honda 919
2004 Ural Gear upComment
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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.Originally posted by gustovh View Post
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.
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