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Topic: blow-by with blower motor

in Forum: C3 Engines


blow-by with blower motor

Posted: 4/2/04 6:49am Message 1 of 6
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fortlauderdale, FL - USA
Joined: 3/15/2004
Posts: 288
Vette(s): 1978 greenwood custom vette, 468 blower motor side pipes.
How do you connect a pcv valve to a motor with a blower system??
I am getting some smoke at idle from my motor and want to try to correct this.
Appreciate any ideas |ohwell|



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blow-by with blower motor

Posted: 4/2/04 9:40am Message 2 of 6
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CUYAHOGA FALLS, OH - USA
Joined: 12/2/2003
Posts: 6424
Vette(s): 1975 C3 Red, T-Tops, Black Interior. All I need is time and money! Getting there!
That's when you disconnect the pcv from the engine and connect it to a blower to create the air flow through the engine. Set up the way the blower need to create a suction. There will still be some smoke from the blower outlet. If you have enough air flow volume it won't be very noticable. You cannot route that volume of air into the intake.
There are some custom headers that route the pcv into the headers. The exhaust pulses create suction and vent the crankcase. The pcv fumes get mixed with and burned by the exhaust. No smoke from the tailpipes. This does require a one way check valve to prevent pressure pulses from sending exhaust into the crankcase.
You can put a blower on the inlet side of the pcv and a filter on the outlet, and vent it that way.
Another option is a larger volume pcv valve with the stock system, but that will require readjusting the carb to maintain the correct fuel mixtures.
Now the question is why is this a problem? Does the engine have too much blowby at the rings, or has the engine been modified?

Ken Styer


blow-by with blower motor

Posted: 4/2/04 12:00pm Message 3 of 6
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The Woodlands, TX - USA
Joined: 9/2/2002
Posts: 104
Vette(s): 1976 L48 T-top, Auto, Bright Blue, smoke gray interior
To add to Ken's comments, Moroso makes a crankcase evacuation system. It provides the oil seperators/breathers that install in the valve covers, check valves, weld-in nipples for the headers. You can find it at Summit Racing, Jegs or most speed shops. I have also read a couple of articles where belt driven vacuum pumps are installed on large big blocks with low vacuum to help the rings seal. That maybe a little extreme for your application.


sstanford '76 L48

blow-by with blower motor

Posted: 4/4/04 8:41am Message 4 of 6
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fortlauderdale, FL - USA
Joined: 3/15/2004
Posts: 288
Vette(s): 1978 greenwood custom vette, 468 blower motor side pipes.
Thanks for your input. Just got a hold of the man I purchased the car from. He said I can connect a universal pcv valve directly to the front carb setup, I have two holley 600cfm's. The vacuum from the second goes to the brake booster. I will try this and let you know if it was successful.



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blow-by with blower motor

Posted: 4/20/04 6:13am Message 5 of 6
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HOUSTON, TX - USA
Joined: 11/15/2002
Posts: 296
Vette(s): 1976 L-48 coupe
Scott,
I am interested in your pcv set up. Did you resolve your problem? I am about to fire up my single carb supercharged 350 and was anticipating this problem.

|headscratch| |hammer| |wavey|


blow-by with blower motor

Posted: 4/20/04 8:59am Message 6 of 6
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fortlauderdale, FL - USA
Joined: 3/15/2004
Posts: 288
Vette(s): 1978 greenwood custom vette, 468 blower motor side pipes.
Hooking up the PCV valve to the front carb did the trick.
I am running a 1969 468 stroker motor with a 671 BDS blower with 2 holley 600's and it has stopped all the smoke I was getting.
Hope this helps you



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in Forum: C3 Engines


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