You can drill and tap a carb spacer to hook up the PCV. The pressure inside the engine will increase if the PCV valve doesn’t. Here are the most common bad PCV valve symptoms: Sludge can start to buildup in the crankcase, which can have serious repercussions on the engine in the long run (PCV valve clogged). dunno what that equates to on the metric scale though. A bad PCV valve can cause many serious issues, especially if not taken care of on time. I narrowed it down to a 7/8 socket, seeing as the 13/16th was too small, the 15/16th was too big, so one stands to reason. Its bigger then 22mm, which is the largest metric socket I tried. If the intake has a threaded plug you can hook up the PCV valve there. The new valve is 19mm, but the one that is on there now is some goofy ridiculously large size. He said most companys tig weld the hole up after drilling but delkron threads thiers and plugs it.He said to check and make sure that the hole/plug is sealed good and not allowing it to loose any vacum on the up stroke of the motor. The breathers should be alright on the test stand. Underneath the cam side case there is a hole in the casting where the mnfgrs drill out the breather passage that runs from the lower cam cavity back up to the breather gear. Replacement positive crankcase ventilation valve, PCV Valve for the Audi TT Refer to Ignition Coil and Ignition Coil Module Replacement in Engine Electrical It's function is to recycle a small amount of exhaust gas back in to the intake air to help cool the combustion process for a more complete burn of the air/fuel mixture 1200 SeriesThroughout PSI's program of continuous product improvement. My PCV hose is plumbed to the PCV nipple at the base of the rear (primary) carb. One thing Posey did tell me to check out on the delkron cases. I also picked up a spyke pcv valve that I may try between the case and canister. I just built a leak down tester and I am going to see what that tells me. FCP Euro gives you the entire rundown on the replacement of the PCV valve for the B8 Audi. I put a pure power oil filter on it and that helped but it hasn't taken care of the isuue all togeather. Its even compatible with the factory Race DP exhaust system. I have oil issues too when I get over the 4500 rpm range. I took a 1/2 to 5/16 threaded reducer and put in my heads then used 5/16 solid bolt to mount my carb/breather bracket to the heads. Posey, at one time he was a tech at delkron, said that they actually recommend pluging the head breather ports and just use the case breather. You're effectively contaminating your oil with fuel and carbon.I have pre 93 delkron cases with the bottom breather. There is no real 'chart' or spec page for PCV valves. Is it easier to rethink the entire design that has been used since like 1988 on ALL turbo cars? Or is it easier to make it better? Your current idea provides no vacuum to the crankcase. I'm saying it's a bad idea so that others don't think it's going to work.cause it won't.Īsk yourself this. So the crankcase pressure will be vent to atmosphere freely (no PCV valve). so.I hooked a New breather up there, and ran it to a Catch Can. A couple of months ago, I discovered I had a breather function in the early Delkron cases that I'm running. I think I will connect the PCV valve opening and valve cover opening to a oil catch can with a breather. Hi Everyone, Have a '96 80' Evo spcn softail, w/ ev-27 cam, modified cv carb, 2 into 2 aftermarket pipes mild build. I saw many professional race car/drift car also use this setup. ![]() Venting PCV and valve cover breather to atmosphere is not the best way, but it works fine for many people. We specialize in high horsepower forced induction engines SOLD 1LE PCV System - Catch Can GM (12653073) Almost new As shown in photos 49 Shipped within the U This is especially true in a pressurized induction system like a supercharger or turbocharger due to increased crankcase pressure from blow-by They compress the air flowing into the engine (see How. After reading ton of PCV system threads from Nissan, Honda, etc., the only ways to create vacuum are to connect PCV valve to exhaust or install electric pumps.Ĭonnect the PCV valve to intake is not a good idea, because having unmetered air entering intake will create idle/tuning issue, and the PCV valve will shut under WOT/boost.
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