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Reply to "Engine Leaks"

Marshall, on a 1641 you shouldn't be using that much at all. If you get a bigger motor in the future, maybe our experiences can help you.

Stan explained what is happening in a larger aircooled type1 very well.

I had a never-ending(worsening?) blowby problem. I vented the valve covers and case(1/2" ID hoses and fittings). I built a large 550-style angled tube breather. I installed a sand-seal. I even installed an rpm-controlled solenoid that evacuated vapors into the exhaust. Still got vapors and mist all over the engine compartment.

So then I went down the dry-sump rabbit-hole. Stan was happy to have the company LOL! I tried different breather arrangements, along with the dry-sump. Still had oil mist.

Last summer, I rebuilt the top end of my motor. New Mahle forged pistons and cylinders. Used Total-Seal for 2nd compression ring and oil scraper 3rd rings. Sent the heads out for guides and re-cutting the seats. I bought a Gene Berg case-cutter and cut the case, and installed the GB double lip seal. Along with the rebuild, I changed the main case breather. I enlarged it from 1/2" to 3/4" ID, through the distributor hole.

It is now much, much better, but there will always be a little mist when I rev up to 6500. If I keep the revs below 5000, the engine stays very clean. But if you play up there where it sounds SO good, there will be some oil mist generated that will overwhelm whatever system you have in place to prevent it.

Last edited by DannyP
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