That's what the factory PCV systems does. The last version used from about '70
to '74 works the best *without a PCV valve*. It connects the oil separator
canister on the timing chain cover to special ports on the SU's without a PCV
valve and works very well as long as the engine is in good condition.
> On Nov 26, 2021, at 12:51 PM, David Ambrose via Spridgets
> <spridgets@autox.team.net> wrote:
>
> Has anyone ever tried actively pulling crankcase vacuum to prevent the
> leak?
>
>> On 11/26/2021 7:34 AM, Rick Fisk via Spridgets wrote:
>> Hi David,
>>
>> The kits from MED engineering in England work. But they are quite pricey
>> and require removal and machining of the rear main cap. The kits from
>> Gerard's Garage work well and are also pricey. I ran one of his kits on one
>> of my race engines and it worked well. But Gerard quit making them a few
>> years ago. He came out of retirement a few weeks ago and said he was going
>> to produce another batch, but I believe it's too late to get in on this run.
>> The other kit for sale out there and sold by Moss, Spridgetmania, etc. all
>> come from the same supplier in England. They slow the leak down, but don't
>> really stop it. I have one of those on another engine.
>>
>> I also have a well built properly ventilated engine with the nothing but the
>> factory eyebrow piece and it doesn't leak. My last street Midget was a '72
>> with the factory PCV system functioning properly and it didn't leak. :-)
>>
>> Rick
>>
>>>> On Nov 26, 2021, at 9:51 AM, David Doiron via Spridgets
>>>> <spridgets@autox.team.net> wrote:
>>>
>>> Anyone have experience with the various rear main seals?
>>>
>>> W David Doiron
>>> ------------------------
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