On 18 Nov 2002 at 17:23, R. Ashford Little II wrote:
> The question is this: since I get more smoke at upper rpm's, but the
> manifold vacuum pressure is less at upper rpm's than at idle, then why
> doesn't it smoke more at idle than at those elevated rpm's?
Here's a guess. Depending on the state of your PCV system, higher
rpms create more pressure in the crankcase, and thus higher pressure
at the tops of the valves via the pushrod tubes, thus pushing more
oil down the valve stems.
--
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire, '70 GT6+
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