Lately, my pal and I decided to opened up our SC and check whether is there any oil in it. Indeed, the SC is dry, no oil. Based on advise from one of the threads here, we topped it up with 75W90 fully synthetic gear box oil, there is no over filling and we know there are two chambers.

Both of us took our cars for a dyno run and realised that both have lost 30WHP, compared to our previous dyno runs before change oil! Two cars with SC oil changed both have the same problem!

My queries are what should be the proper oil to use and how much of it? Separately, I have email Eaton and hopefully will get an answer from them too. Thanks.

 

GM part #12345982 is the Supercharger Oil they use in their Eatons. I'm pretty sure that's what the guys on here have been using.

 

Problem is that we may not be able to get this GM part, as there is no supercharged GM/ Ford cars here in Singapore!

Anyone know what grade oil is this GM oil?

 

I'm pretty sure the oil is designed specifically by Eaton for Eaton superchargers. Using any other oil may cause some problems.

 

perhaps the oil may have have some damaging properties, after years ...but I gotta think that Wet and Lubed is better than DRY ...
The SC isnt like a auto trans or the like where the fluid may foam or have different hydrolic properties

 

Yeah but thirty horsepower. I find that hard to beleve.

 

yes +-30HP ...Must be a bad test or something else going on.

But lube is GOOD

 

Do you have to pull the blower to get at it? Im curious.

 

The 75W90 oil is in both cars for less than 1-2 months. My friend feels the 'drag' after he changed it and took it to the dyno. Numbers show that he lost power. To ensure that the oil is indeed the culprit, I also dyno my car. Prior to that oil change nothing major has been done to the car (except ac compressor) and no modifications.

Yes, its 30WHP lost for both cars. The dyno is the same we use before and after oil change.

Btw, when we took out the SC when changing oil, we also check that there are no metal fillings (due to grinding of gear/ vanes). The SC is intact, though no oil.

 

That = Strange.

 

Is this something we are supposed to check regularly as part of the general inspections? How does one check the level of oil in our superchargers?

Rich

 

Post #71

 

What about an issue with the Dyno? Like the numbers are off or something wasn't tuned right.. 30hp seems very big IMO. I haven't had the chance to take the SC apart as of yet. But I know enough about vehicles to think the 30hp loss probably isn't from the lube you installed.

 

No way it's the oil. And it only takes a few ounces to fill up both ends and these have nothing to do with the rotors, mainly just the water pump.

 

http://cgi.ebay.com/ebaymotors/Super...mZ380034369285

 

Do you have a boost gauge on either car? You may have a boost leak after reinstalling the S/C and intercooler.

 

No boost lost. Boost same as before the lost.

No issue with the dyno. Even if there is, it will be systematic error. The delta/ change of power will be still correct.

Yes, I know the GM12345982 oil to be used. Even Eaton emailed me and confirmed that. It is just in Singapore, we can't find this part. Think will order online and get it fixed asap.

Will update you guys after I change oil and dyno again.

 

I know I'm late to this but....I believe it takes about 30hp to drive the supercharger at redline. To lose another 30 due to an oil change sounds very strange. Anything is possible until you find out the real cause, but it would seem near impossible to double the supercharger drag due to an oil change. Please keep us updated.

 

I talked to my SA, and she said that the supercharger doesn't have any oil in them, because I also read the thread and thought that maybe I should change the oil in my supercharger only to find out that it doesn't contain any oil.

 

Wrong. The supercharger ABSOLUTELY has oil in it. But changing it is not a scheduled maintenance activity, and there's not easy way to do it.

 

I think a little clarity is in order here, the oil is only where the gears and bearings are.......in the end caps - not in the whole s/c, so it is only a few ounces.

I have large blowers in my plant - it's the same device as on our cars only much larger - they run high volume and low pressure - and I use 30 wt compressor oil - synthetic, non-detergent - the same stuff I use in my large 15 hp air compressor.

I think 75w90 is the wrong stuff to use, especially if it's cool outside. It also may not be compatible with the oil seals in the s/c. I'd get it back out of there asap, and maybe flush the bearings and seals with some ATF or something thin to wash out the EP gearoil before putting the s/c oil back in.

 

EXACTLY 75w90 is wrong...... way wrong.

Try - http://www.superchargersonline.com/p...ssories_sc_oil