Oilt temp range

[Guest]

I have a '80 GS750 TSCC motor. The "book" says normal oil temp is 140 degrees. Does anyone have an idea of what the normal temperature range is?

I'm asking because this motor is in a road racing sidecar. Airflow is limited around the motor. I'll be using an oil cooler and was thinking of adding a fan for the time I'm sitting on the grid waiting for the start. Most automotive remote thermostats kick on at 165 and I'm thinking this is too high.

[Nessism]

I have no idea what "book" you are referring to, since 140F is no where near the typical oil temperature on your bike. Most of the time it will run in the 240F range, with air flowing over it. Slow down in traffic and it will crest 300F.

In your application you don't need a thermostat. It will just add more connections which can leak.

[OLDENUFF]

book probably meant 140 C. which is about 250 F.

[tkent02]

book probably meant 140 C. which is about 250 F.

Still a thermostat can only impede the flow of oil through the cooler, if the problem is your oil getting too hot you do not want one.

[Kyler]

My Clymer manual (for '77-82 bikes) under the oil pump section says normal oil pressure is 43-78 PSI at 3,000 RPM and 60 degrees C (140 F). I wonder if that is a typo. But I'm glad to know the temp is a lot higher. That means I can use automotive components.

I'll try it without the oil thermostat first. I'm adding an Innovate MTX-D Oil Temp/Pressure gauge that allows me to download data. I'll watch temp/pressure and go from there.

[Nessism]

That particular GS engine is the only one that isn't bullet proof. Lots of them fail from oiling system problems which wipe out crank/rod bearings, and cams/rockers/head. Suzuki promoted a fix that involved shimming the pressure relief spring .60". I'd do that at minimum, and use synthetic oil (not car oil either - diesel or motorcycle oil).

When you plumb the oiling system make sure you are not adding too much extra flow resistance. Last thing that engine needs is poor flow.

Oh, and you might want to search out Basscliff's website so you can download a real manual.

[Kyler]

That particular GS engine is the only one that isn't bullet proof. Lots of them fail from oiling system problems which wipe out crank/rod bearings, and cams/rockers/head. Suzuki promoted a fix that involved shimming the pressure relief spring .60". I'd do that at minimum, and use synthetic oil (not car oil either - diesel or motorcycle oil).

When you plumb the oiling system make sure you are not adding too much extra flow resistance. Last thing that engine needs is poor flow.

Oh, and you might want to search out Basscliff's website so you can download a real manual.

Yup - have a copy from Basscliff's site. It mentions the same pressure #s but doesn't mention temps at all.

Thanks for the advice on the shimming - I'll definitely do that!