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Tool Talk Discussion Forum

Catch can vs condenstator

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jack12345

07-29-2006 20:30:04




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A catch can goes on the PCV hose leading to the intake manifold same as a condenstator.Whats the differance? Both collect Blowby, oily vapor, water etc. Manufactors claim increased eng life more power and better gas mileage. Catch cans have been used on raceing cars for years. Anyone have any feedback use?




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Tim Casbolt

07-30-2006 06:50:49




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 Re: Catch can vs condenstator in reply to jack12345, 07-29-2006 20:30:04  
The pcv valve goes in one valve cover and is connected to a full vacuum source. Another hose is connected to the air filter assembly and goes to the other valve cover on a V engine or the opposite end of the same cover on an inline engine. This allows the vacuum source to pull filtered air into the engine and create positive pressure in the crankcase. Negative pressure puts a lot more stress on the gaskets causing leaks. Not sure about the catch can idea. The most common race car setup I've seen is to weld nipples into the header collectors, install checkvalves to the nipples, and run a hose from the valve covers to the checkvalves. The vacuum created in the collector causes constant vacuum in the crankcase. The down side is that this will always release some oil mist into the atmosphere. This is said to produce some measureable amount of horsepower improvement, but I'm not a believer.

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