JasonC SBB

Would water injection into the s/c inlet be a solution?

patsmx5

iTrader: (16)

Maybe. The oil seal died while on the highway though, not under load. I've never tried to use WI during cruise, not sure how that would work.

I asked whipple about water injection to cool the blower and they said they do not recommend it. But they won't answer any of my questions with a straight answer, so who knows. I have read other people who had rotor contact under load had good luck with water injection, and it makes sense.

JasonC SBB

Hmm I remember the outlet air gets hotter when the throttle is closed because there's very little air mass.

Do you have a bypass during cruise / vacuum?

patsmx5

iTrader: (16)

Yeah the twin screw is internal compression, so it's always heating the air. I do have a bypass valve setup and working. I even tested the bypass valve after the failure to verify it was working.

One thought I had was if there was a way to cool the air going to through the bypass, since that would cool the SC in cruise. But there is no easy way to do that.

vehicular

iTrader: (3)

Are you recirculating your bypass valve? On roots blowers with the bypass valve open, the air passes through the blower over and over and IATs measured at the blower outlet creep up to >255F (the range of my IAT sensor). I expect the whipple is the same or worse. Dumping the bypass valve to atmosphere helped considerably, but is loud at idle.

patsmx5

iTrader: (16)

Yes I'm recirculating in. Good info on temps! Like you say, mine is probably worse...

No way I can dump it. I tried running/idling the car and reving it once with the SC outlet to atmosphere. It scared me when I reved it. It was one of the loudest things I've ever heard.

aidandj

iTrader: (5)

Muffler on the outlet.

patsmx5

iTrader: (16)

Dumping it isn't a good solution anyways even if you could make it quiet.

Car is close to being ready to test everything, so I'll know soon enough how the temps look.

vehicular

iTrader: (3)

Why? Unless you're running a MAF what difference does it make?

The SC outlet to atmosphere is exponentially louder than just bypassing to atmosphere. Dumping a long ways from the SC outlet helps tone it down. Also, a foam filter on the outlet helps quiet it down some.

patsmx5

iTrader: (16)

Because I have a throttle upstream of the SC. So opening the bypass to atmosphere is the same as opening the throttle up, the engine would just suck air through the bypass and accelerate. Would not work on my setup.

And even if it did, it's WAY too loud, there is no way in hell I'd drive the car with the SC being any louder than it already is.

If the SC is somehow still too hot during cruise then I'll probably figure out a way to cool the air being recirculated. But I really hope it doesn't come to that and I don't think it will.

aidandj

iTrader: (5)

Check valve

patsmx5

iTrader: (16)

A check valve doesn't fix anything though.

Anyways I'm not dumping the bypass, that will not work and would be too loud even if it did work. I feel like I said that 3 times already.

patsmx5

iTrader: (16)

Temperature data. Pic is weird shape so you'll probably have to click it to open in a new link, and then hit the + sign to actually be able to read it. Conclusion is that SC compressor and oil case temperatures are not significantly raised due to its location in the engine bay. I sent this to Whipple himself asking for their blessing. We'll see what he says.

vehicular

iTrader: (3)

https://www.modernperformance.com/pr..._blowoffvalves

I'm not trying to be a troll about this, just pointing it out. I think one of these would work excellent, and not be offensively loud at cruise.

patsmx5

iTrader: (16)

Well after weeks, emails, phone calls, Whipple's staff are excellent liars. They won't contact me back or tell me what a normal operating temperature is.

However, after 3hr drive with the SC installed, I'm seeing ~200*F.

The oil case is 20*F cooler on the front getting airflow vs the side that is not. So the fan has to be helping some. Haven't shut it off to see what the oil temps would do without it, but clearly it's got to be helping some, so it's staying on the car.

Oil so far is clear as the day I poured it in, and levels is holding. Looks like this problem is fixed!