mrimage27

anyone know if a blow off valve can go on our superharger? if so how?

rezurex

from what i know only turbos can utilize BOV's

Lbsublime86

From what i understand no. Im sure you will get a much better explanation why but heres my thought. A turbo has to spool up to force pressure into the engine. The blow off valves have two main purposes 1.Sound cool 2.Prevent boost leakage. Supercharger's work differently by using a belt to constantly pump boost into the engine. So im guessing since the supercharger is using a belt there is no loss in boost? meaning a blow off valve would be pointless. Just tryin to help sorry if its not rite .

G

Well, actually, a blow-off valve is to relieve the engine of boost during shifts etc. And, I am almost 100% sure that a blow-off valve cannot be put on a supercharger.

scalbert

Not on the positive displacement blower on the Comptech kit. The blower is after the throttle body negating the need for a BOV.

The reason for a BOV is to elimintae compressor surge. That is when you are under boost and close the throttle. The boost that is in the intake plumbing before the TB wants to equalize with the ambient air. The only way out is back through the compressor. This causes cavitation of the compressor wheel which damages the bearings over the long run.

IT IS NOT JUST FOR SOUND!!!

With all of this in mind, yes, a BOV can be added to a supercharged system. But only to a centrifugal unit which is almost always placed prior to the TB. The Comptech blower is a roots style which is installed after the TB.

Also, the Comptech blower does use something similar; a bypass valve. It opens with vacuum and reroutes excess flow back around to the inlet of the blower. But not to atmosphere as this is still under vacuum and only intended to smooth the blower operation under vacuum.

G

Guess mom was right, you learn something new everyday!

mrimage27

so scalbert where do you place the BOV?

mrimage27

Can you run it with the bypass valve, or you have to disconnect the bypass valve?

scalbert

On what?? A turbo/centrifugal SC??

scalbert

If you are referring to the integral bypass valve on the Eaton blower, it can be run with or without. But mileage will decrease and sound will increase at idle and part throttle with it disconnected.

NiteQwill

Though adding the BOV is a possibility, on the CT S/C, there would be no gains, possibly losses as steve said.

With the use of the BV/DV, correct me if I'm wrong, but that amount of pressure is needed to run things smoothly, hence, the reason the roots shouldn't release pressure into the atmoshphere.

scalbert

Nope, still couldn't do it. If you opened a traditional BOV in a roots style system it would be like opening the throttle but after the blower. The engine would rev up, etc.