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Wisconsin Engines Single cylinder up to V4 engines.

Wisconsin Engines

V4 Wisconsin Blowby

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Old 04-13-2009, 05:39:39 PM
Michaeljp86 Michaeljp86 is offline
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Question V4 Wisconsin Blowby

Do these engines have blowby? While running the vg4d I pulled off the cap where you pour oil in and there was quite a bit of air blowing out. It wasnt smoking any like it was burning oil.
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Old 04-13-2009, 06:36:05 PM
Ed Radtke Ed Radtke is offline
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Default Re: V4 wisconsin blowby

thats just windage.check your crank case breather valve.
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Old 04-13-2009, 08:31:42 PM
TWest TWest is offline
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Default Re: V4 Wisconsin Blowby

The cap that you had to remove in order to pour the oil in is the crankcase breather. There is no breather valve on the V-4 engines as Ed stated, only on the 1 and 2 cylinder Wisconsins. Ed is correct though as what you feel or hear is "windage" or a small bit of blow-by as all engines have some of it. If your engine is not smoking and is running ok you shouldn't worry about it.

If it does begin to smoke you would have to pull the heads, measure the bores and check the rings.
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Old 04-13-2009, 09:46:58 PM
Andrew Mackey Andrew Mackey is offline
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Exclamation Re: V4 Wisconsin Blowby

Since this engine is built in the Vee configuration, at some point there are 2 or 3 cylinders with the pistons traveling in the same direction at the same time. This raises or lowers crankcase pressure slightly. Removing the fill cap while the engine is running, is NOT a good idea, as it allows this pressure/vacuum diferential to escape. At high speed, you could have gotten a bath of hot crankcase oil! Don't open the cap while the engine is running. It is not a good idea to pull the oil dipstick, while the engine is running, for the same reason.
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