I had an electric pump on the car that lasted about 3 weeks and now its burnt up. I was looking into the moroso system but that has to be rebuilt every so often on a race car...so its not really good for the street. What kind of systems are people running on the street for an EVAC setup that have been on the car long enough to trust that is will not fail after a month.

 

Vacuum pumps are not good for a street engine,they cause a lack of lube oil in places that need it.If ya haven't got low tension rings ya don't need it.
Ya probably won't see a HP gain until 15-20 in of vacuum or a very small one.
Call Moroso and ask them. Ya gonna need a 600+dollar set up to get any countable vacuum.

 

I'm using a system from Star Machine, and only running a peak of about 7in of vacuum.

I have it because-

I did not like open breathers dripping oil on my headers.

I will have no oil seepage due to crankcase pressure, everything is nice and clean.


http://www.ls1speed.com/artwork/intmd8/large/036.jpg

http://www.starvacuumpumps.com/catalog.php?cat=1

 

For the STREET??

No brainer. Baffled valve covers, PCV valve in one, breather in the other. So let it be written, so let it be done.

Trust me, you can't beat it. Ask me how I know.

 

That might work for a 13 second car. It will never work for a 1200hp daily driver..

INTMD8,
Do you drive your car on the street? Did the company say anything about having to rebuild the pump? That is something i need but i will have to see if I can fit it.

 

Why not?I used this set up on a 1500HP super comp. Sealed,PCV,exhaust extractors,what more da ya want.
We later went with a vacuum set up at 20 inches,but guess what the car was no quicker and it was as dry before the vacuum.
If your turbos are pressuring the base,put a one way check valve in the PCV line..On blower cars that's what I do.

 

Yes, my car is primarily street driven. Star machine said I might have to rebuild it every 10k miles or so, but I don't have enough miles on it yet to give a good feedback on reliability. I will say that I researched many vacuum pumps and this was the highest quality pump I could find.

 

This works like a charm... do it

 

Don't know if it actually does anything but I've got a Cobra R electric vacuum pump on mine. Don't know how many in/hg it pulls, but it seems to work ok. Sounds pretty cool, and has a nice suction sound when you pull the oil cap off.






P

 

I found after having alot of blow by and dipstick gyserts, the header evac systems installed on a "street" car does not work. There is simply too much back pressure in the exhaust system with mufflers installed so it actually pressureized the block itself causing a few oil leakage problems. This was done in 2 configurations-1. with anti blow back valves installed on collectors nipples and another without them installed, both netted the same results of excessive oil seepage under valve covers, through valve cover baffles, and shooting my dipstick tube out.

I dropped exasut at one race, reinstalled the valve cover to collector hoses and then it was fine, so it just proved what all the other guys were telling me that the mufflers slowed down exhaust a bit too much. FWIW, with exhaust open or all intsalled there was no difference anywhere on the track itself-ran the same. but multiple tests have shown that even in an ideal set-up/perfect world the moroso header evacs do noit provide enough vacuum to really net any gains so that goes along with what others have said about not seeing anything after they're installed.

Next set-up will either be a 3 or 4 vane pump, even if it does need to be rebuilt once in awhile, being able to adjust vacuum is the only way to see any real benefits.

 

Thats funny, because they actually do work, You have to put the steel pipe in the collector generally at a 45* angle, and into the pipe an inch or less, On my dads 600 hp pontiac, it is worth 12 hp varified on the dyno. And a breather doesn't help performance wise, its always better to have some suction on the motor, it relieves certain constant blowing of air in between the reciprocating assembly. If you install the "red neck" tubes in the headers, they are more effective, and will cause no loss in power, because no oil is being introduce into the air fuel mix.

 

Still ran 8.90 huh? really I'm just kidding.


PCV is a must for non-boosted street cars, but totally ineffective when under boost and the big problems occur.

If you are really just trying to keep blowby in check and oil off of your valve covers/headers etc and the engine is in good shape consider remote mounting a dry sump beather tank off of a valve cover. The tanks are baffled and do a pretty good job seperating the oil from the blowby gasses. Usually you would drain this regularly but you could plumb the drain back into a valve cover for oil recirculation.

If you are looking for power with a vacuum pump as well keep in mind you'll still need the above breather tank for the outlet of the pump. A wet sump engine is a tradeoff with a vacuum pump. You have to be careful with the vacuum drawn because the oil pump will fight the vacuum as it needs to be fed and its drawing a vacuum of its own.

Really though if blowby is a real problem for you and the dipstick is popping out etc you may just need to refresh your shortblock. While blowby will increase with higher cylinder pressures from forced induction it will still be fairly minimal and shouldn't cause problems on its own - talking very hot street engine here that is allowed to warm up.

Do not trust a pcv valve to seal off boost on its own and do use a checkvalve as racerdude suggests if you intend on keeping it.

 

To dispute this....

And to compliment this....

I'll post this...

20 is a bit too extreme. Following quote from a different forum from a racer with mucho professional class race experience. "A very small amount can be very helpful. It's those first few inches that really help the power. I would take 1" over nothing any day and go to great lengths to get it."

EDIT: I'll gladly take 5" from any cheapo pump that will last longer than my last oil change. Anything is better than any amount of pressure buildup in the crankcase.

 

As I was putting my motor together, the guys doing my machine work (and really teaching me alot about performance that I didn't know) mentioned something to me about putting a vacuum pump off of a Corvette on my car. I'm assuming this vacuum pump would be similar to the Cobra R pump pictured above.

I'm all for trying new stuff out on the car that might help out a bit. From the simplicity of how the Cobra R one pictured is set up, it would be really simple to do a back to back dyno run and compare.

There seems to be a good bit of disagreement in this thread, but my question is this- taking into account my modifications in the signature, if I were to put say a Corvette or Cobra R electric vacuum pump on my car, regardless of whether it helps at all could it damage anything?? If not, and I can find one for a good enough price I will give it a try.

 

the other good benefits of up to 12 or 14, in my personal experience, seems to work well, anything more, on some motors they will begin to suck in silicone from the intake to block seal, suck in valve cover gaskets on less than well maintained motors. The extra vacuum helps rings seal, reducing blowby, helps valve seals control oil better at high r's, reduces pressure from reciprocating parts in the motor, making it easier to turn(parastic loss). I am going to use the evac in the headers, for 10-15hp gain, for 40$, it is a worthwhile gain for the money, I will have one coming out of each valve cover.

So whats the deal with this cobra r pump?