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#1 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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As the title says. I ordered a crankcase evac kit on summit. Payed attention to the instructions religiously and...
It works on my full exhaust street engine. At 500rpm it pulls 3-4 inches vacuum and I can imagine much greater at higher rpm. The top end feels a little stronger too. And this is only one side done so far haha. most people at the track in Bremerton report half a tenth to a tenth faster 1/4 mile times with this kit but usually run 11.80 and faster. and this isn't just talk, we did this on our 67 belvedere with a 496. We ran consistant at 10.64 and started running 10.58. So if your curious about the kit or want to try make sure your running large tube exhaust, good headers and mufflers that are high flow. Any questions comments or concerns? Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#2 |
Registered User
Join Date: Jun 2007
Location: Cape Coral, Florida
Posts: 1,123
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Re: Installed crank case evac today...
Will this help with moisture problems inside the motor? With a mild cam my pcv doesn't take all the moisture out of the motor, and I get a build up on the inside of the valve covers. Is 2.5 inch exhaust with turbo mufflers ok to run with this? Or do I need higher flowing exhaust than that?
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1986 Custom Deluxe 10 1978 Caprice 2 door - sold 1937 Chevrolet 2 door sedan - project |
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#3 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Installed crank case evac today...
Turbo mufflers prob not. I get a lot of moisture in my engine as well. If you have an aluminum intake a little known fact is that the aluminum sweats when the engine is cooling. Kind of like a window on a cold morning.
I have not run the evac kit long enough to know if it will help ( just on a couple hours ago) but I imagine it would If your pcv does not creat crankcase vacuum at idle then either your ring seal is bad or your pcv isn't hooked up right or your like me with bad ring seal and a cam that makes insufficient vacuum Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#4 |
Registered User
Join Date: Sep 2011
Location: Knoxville, Tn
Posts: 408
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Re: Installed crank case evac today...
Something I researched forever when I had my C5, really no reason at all not to run one if you got the money. It's got a ton of advantages.
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#5 |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Installed crank case evac today...
I was hesitant cause everywhere you search they say it won't work on street cars or full exhaust systems
NOPE THEY WERE WRONG Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#6 | |
Registered User
Join Date: Sep 2010
Location: Kirkland, WA
Posts: 241
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Re: Installed crank case evac today...
Quote:
I definitely would not hook up a system like this to a muffled car. On a street car you're much better off to use an electric system as mentioned by Firebirdjones. The additional weight is negligible and it works 100% of the time, not just when conditions in the exhaust stream are just right. |
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#7 | ||
Registered User
Join Date: Sep 2011
Location: Knoxville, Tn
Posts: 408
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Re: Installed crank case evac today...
Quote:
Quote:
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#8 | |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Installed crank case evac today...
Quote:
However I'm pulling vacuum all the way up to 3000rpm (didn't rev it higher in consideration of neighbors) but it seems to work all the way I have a three inch xpipe system and spintech mufflers so that seems to be working. But I think anything smaller prob wouldn't work Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#9 |
Registered User
Join Date: Jul 2012
Location: Salt Lake City
Posts: 59
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Re: Installed crank case evac today...
Pardon my ignorance, but anyone wanna put the crankcase evac in a nutshell?
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#10 | |
Registered User
Join Date: Jul 2009
Location: washington
Posts: 4,178
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Re: Installed crank case evac today...
Quote:
The other is belt or engine driven and is a vacuum pump Third is an exhaust system the had a tube in the collectors and the exhaust pulls a low pressure area across the tube and crates vacuum. On the end of this tube there is a one way valve and some heater hose that runs to an air oil separator on the valvecover that looks like a breather Posted via Mobile Device
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377 sbc thumpr cam autogear m23 muncie 3:73 Detroit trutrac 3''spintech prostreet mufflers xpipe 1 3/4 headers build thread !http://67-72chevytrucks.com/vboard/s...d.php?t=577217 Iroc gauge threadhttp://67-72chevytrucks.com/vboard/s...d.php?t=554511 |
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#11 |
Registered User
Join Date: Sep 2011
Location: Knoxville, Tn
Posts: 408
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Re: Installed crank case evac today...
Basically it hooks into your PCV system, is run by a belt attached to a something (idler on my C5, not sure on a SBC) and pulls a vacuum from the crankcase into a catch can. It helps to seal the piston rings and helps with oil consumption.
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#12 |
Registered User
Join Date: Oct 2009
Location: Prescott, Arizona
Posts: 2,396
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Re: Installed crank case evac today...
What we usually do for those that are junkyard savy and want to save some coin, is pull the electric vacuum pumps from newer fords.
You don't need high flow exhaust for this one to work. Just wire it up, hook it to the PCV system, and you have a vacuum pulled all the time. Usually hide the electric pump up inside the wheel well or somewhere inconspicuous, they run fairly quiet and don't draw much amperage,,,very stealthy for those trying to keep stock appearance ![]() |
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#13 | |
Registered User
Join Date: Nov 2011
Location: Oklahoma City Oklahoma
Posts: 1,056
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Re: Installed crank case evac today...
Quote:
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Tags |
crankcase evacuation, crankcase pressure, evac kit |
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