Re: Dry sump

[Bryan Savage <basavage@earthlink.net>]

Help me here Grib.
Is the whole engine at 20" or just the crank case?
If there is 20" of vacuum around the valve seal and stem in the rocker cover
how do you get oil down the guide?
It seems like hot exhaust gas would be sucked up the guide and past the
seal so I must be missing something simple here.

Thanks,
Bryan

rgribble wrote:

>They (NASCAR) have changed valve guide and seal materials just so they
>can run the high numbers. Of course sucking the oil from the valves is
>not a good thing and not my idea of chances I'm willing to take. I
>already run 5 wt oil which doesn't leave much room for error. 
>
>Aside from sucking oil down the valve guides, these high vacuum readings
>are the reason most NASCAR engines do not use gaskets, (especially thick
>gaskets) it's metal to metal with a little RTU for looks.

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