[Build Thread] -- Journey to 700+ WHP [Supercharger]

[milkcow500]

This has been an ongoing issue with this blower for a number of years. What's happening is that the output shaft seal is leaking hot compressed air into the housing, which causes the oil to plash upwards. The only real solution I've seen to this was to plug BOTH sides, since it is a self-contained unit.

Edit: Rusty's idea sounds pretty good imo.

[redondoaveb]

Here's an article from SOHO Motorsports blog where they mention over spinning the supercharger and oil coming out of the breather at high rpm/boost. Of course I think Ben's car was seeing about 18psi.
https://sohomotorsports.com/700-rwhp...d-nissan-370z/

[Optimiser]

Originally Posted by Rusty

All the vanes on the impeller are in the air flow. No part of the impeller touches oil. The oil is in the middle housing. Think what is happening is a combination of things. Oil level, high rpm, fluid expansion, poor venting. The oil capacity of the housing isn't that much. With high rpms, the oil gets splashed around a lot. Also with the high rpms, you heat which makes the oil expanses. And then you have a pipe plug with a simple hole drilled into it. One thing to do. You need to do is make a shield on the bottom of the vent plug to keep oil away from it. And put some type of breather on top of it. Also what you could do. Put a hose fitting where the vent plug goes. A length of hose. Then you need an orifice of some type in the hose. Then put the end of the hose into a catch can.

When I worked for ElliottTurboMachinery. I built and repair stuff like this.

"Also what you could do. Put a hose fitting where the vent plug goes. A length of hose. Then you need an orifice of some type in the hose. Then put the end of the hose into a catch can."

This is exactly what I've been thinking and have purchased a few cheap bits and pieces to make something like this up.

[Optimiser]

Originally Posted by milkcow500

This has been an ongoing issue with this blower for a number of years. What's happening is that the output shaft seal is leaking hot compressed air into the housing, which causes the oil to plash upwards. The only real solution I've seen to this was to plug BOTH sides, since it is a self-contained unit.

Edit: Rusty's idea sounds pretty good imo.

Isn't plugging both holes risking seal blowout even with the upgraded seals?
I'd love to do that but am too worried that the little breather really needs to breathe. I would have thought it's designed that way for a reason.

[milkcow500]

Originally Posted by Optimiser

Isn't plugging both holes risking seal blowout even with the upgraded seals?
I'd love to do that but am too worried that the little breather really needs to breathe. I would have thought it's designed that way for a reason.

I've been told that it isn't necessary, but it's really not a definite known. To put it in perspective, the procharger is a very similar design and it does not utilize a vent plug. I know a couple people who have ran with no vent, but no real long term testing yet.

[bcfromfl]

I've read back through the posts, and couldn't find what your target psi was...do you know approximately where you were at when you experienced the leak? Were you at 18psi?

[ANMVQ]

Originally Posted by milkcow500

This has been an ongoing issue with this blower for a number of years. What's happening is that the output shaft seal is leaking hot compressed air into the housing, which causes the oil to plash upwards. The only real solution I've seen to this was to plug BOTH sides, since it is a self-contained unit.

Edit: Rusty's idea sounds pretty good imo.

It is,

Mine did this when it was still stock @ 9PSI, I had fluid all over my windshield. Funny cause they tried to blame me at first saying I had power washed my engine and push water into the unit :/

[cupcakez]

Originally Posted by bcfromfl

I've read back through the posts, and couldn't find what your target psi was...do you know approximately where you were at when you experienced the leak? Were you at 18psi?

Not even close.
My set up is only good up to 13 PSI max I believe.
I do not have the correct pulley setup yet to make it 18 psi.

I do have the 928 fully upgraded parts but only using a 3.0" SC pulley with the stock idler + 3.2" SC pulley on the SC belt side.

[Optimiser]

Originally Posted by bcfromfl

I've read back through the posts, and couldn't find what your target psi was...do you know approximately where you were at when you experienced the leak? Were you at 18psi?

Mine was 10psi when it leaked and went over my windscreen at a track day.

[bcfromfl]

Originally Posted by Optimiser

Mine was 10psi when it leaked and went over my windscreen at a track day.

I'm losing track of what everyone's running. Do you have the standard V3, the Si trim, or the 928 impeller/rebuild?

[Optimiser]

Originally Posted by bcfromfl

I'm losing track of what everyone's running. Do you have the standard V3, the Si trim, or the 928 impeller/rebuild?

Mine is the standard Vortech V-3 Si that came with the Stillen kit but over spun with different pulleys.

[cupcakez]

- 928 impeller/rebuild
- 3.0" Vortech SC Pulley + Stock 3.2" Pulley + Stock Idler Pulley = Supercharger belt side
- Stillen 9PSI Pulley

- Way too much overspin at higher RPM's = oil spouts out.

I have the shipping plug (non-vented plug) with me in case I need a last resort to solve the issue but, I don't want to risk seals blowing out yenno?

I also e-mailed Carl from 928 to see if he had any ideas to circumvent or fix this issue other than what was already shared on this thread.

Will let you guys know if he has any plausible solutions!

[turtle64b]

Originally Posted by Optimiser

Mine is the standard Vortech V-3 Si that came with the Stillen kit but over spun with different pulleys.

The standard V3 with the Stillen kit for us is the SCi trim impeller. The SC trim impeller is an upgrade from Vortech.

[milkcow500]

Vortech SCi-Trim
Vortech Si-Trim
Vortech T-Trim

There's also the Paxton Novis, which use the same bracket and are similar design to the V3.

[cupcakez]

So, Carl from 928motorsports e-mailed me back with a response to the leak issue.
He told me to use his calculator on 928 website to find out how much I am actually spinning assuming no slip.

The calculator has 3 components:
(1) Size of Crank Pulley Diameter
(2) Size of Blower Pulley Diameter
(3) Internal Blower Setup Ratio for V3
(4) Max Engine RPM

Is the crank pulley the diameter of my ATI crank pulley that I had put in? 5.5"?

Is the blower pulley diameter .. I don't know? Isn't there 3 different pulleys on the supercharger belt? 2 SC pulleys and 1 idler pulley? I changed out one of the stock 3.2" SC pulleys for a 3.0" so would I put 3.0?

Max Engine RPM speed = 7.5k ish?

Anyone can help?


SOHO responded but didnt really answer my question, so Im not even going to post what they said.