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02-07-2011, 06:04 PM | #21 |
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Re: model b -- P C V positive crankcase ventilation
"In a turbo or super charged engine (intake manifold has pressure, not vacuum) how do you make a PCV system work properly?"
By taking the vacuum from between the carb and blower/turbo. "run a draft tube from the upper rear of the valve cover to a venturi attached to the end of the tailpipe, or perhaps within a slightly enlarged pipe somewhere after the muffler. The slight suction produced by exhaust past the venturi would do the work, but again, wouldn't pass modern emissions." I would hope the slight suction could overpower the flame front in the unburnt fuel component of the blowby. |
02-07-2011, 06:09 PM | #22 | |
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Re: model b -- P C V positive crankcase ventilation
Quote:
Positive Crankcase Ventilation works whenever the engine is running. |
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02-07-2011, 06:15 PM | #23 |
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Re: model b -- P C V positive crankcase ventilation
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03-03-2011, 02:04 AM | #24 |
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Re: model b -- P C V positive crankcase ventilation
Mike, you are right on with the exhaust creating the vacume to relieve the crank case pressure. I did this on my model b engine and it works 100 percent. Moroso sells a kit with the exhaust bung and a check valve and the breather cap with the fitting on it. It uses a five eights high temp oil line for the relief. I also added another breather to the motor for cross flow breathing. AS I said I have a model b engine ,so I added a breather to the block where the fuel pump would normally be. Life is good
Ron |
03-07-2012, 12:08 AM | #25 | |
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Re: model b -- P C V positive crankcase ventilation
Quote:
Positive Crankcase Ventilation is Fresh air in Old air out through a PCV valve to meter the flow into the intake manifold and prevent backfire into the crankcase. This also works when the car is not moving. Crankcase ventilation is fresh air in old air out through the road draft tube, Works only when the car is moving. In this case "Positive" probably means whenever the engine is running it is being ventilated, Not just when the car is moving. Bill |
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03-07-2012, 08:43 AM | #26 |
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Re: model b -- P C V positive crankcase ventilation
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Piece of cake... Happy Motoring, Chris |
03-07-2012, 09:18 AM | #27 |
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Re: model b -- P C V positive crankcase ventilation
Chris in CT - sounds like a great idea, but I'm not familiar with "straight-up marine-type flame arrestor". Could you possibly post a photo? Would a marine parts supplier carry something like this?
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AL in NY |
03-07-2012, 09:38 AM | #28 |
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Re: model b -- P C V positive crankcase ventilation
Chris in CT: Ditto: pictures please. P/n's and where you purchased the parts.
Paul in CT |
03-07-2012, 01:58 PM | #29 | |
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Re: model b -- P C V positive crankcase ventilation
Quote:
Bill |
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03-08-2012, 04:12 PM | #30 | |
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Re: model b -- P C V positive crankcase ventilation
Quote:
To those who want pictures, I'll try to take these and post them, but have not done this before. If I can figure out how to do it, I'll be glad to post them for you. Chris |
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03-08-2012, 07:53 PM | #31 | |
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Re: model b -- P C V positive crankcase ventilation
Quote:
Which would be more efficient than a slight negative pressure. Bill |
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05-10-2018, 07:47 AM | #32 |
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Re: model b -- P C V positive crankcase ventilation
Any updates?
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05-10-2018, 10:20 PM | #33 | |
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Re: model b -- P C V positive crankcase ventilation
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