It's just one less place for the crankcase to vent, so you feel it more up top.
On 6/26/11, Bob Spidell <bspidell at comcast.net> wrote:
> That was our first thought, too. But the head was rebuilt by an extremely
> meticulous mechanic (a New Zealander living in Modesto, CA) so although it's
> possible it's not probable.
>
> Trying to figure out if/how installing a rear main seal could cause this.
>
> Bob
>
> --------------------------------
> Bob Spidell - San Jose, CA
>
> ----- Original Message -----
>
>
> Worn valve guides??
>
> Sent from my iPhone
>
> On 26/06/2011, at 12:58 PM, Bob Spidell <bspidell at comcast.net> wrote:
>
>> After bragging about our 100M's compression numbers I have a
>> concern. We seem to be getting a lot of pulsed pressure in the valve
>> cover, as felt at the oil filler hole. There is very little pressure
>> at the end of the road draft tube. Given we have good compression,
>> so, theoretically shouldn't have a lot of blow-by, what could cause
>> pressure in the valve cover? The engine was totally rebuilt, and I
>> believe we cleaned out the road draft tube but don't remember for
>> sure (we were otherwise pretty careful).
>>
>> All hints, ideas, even knowledge welcome.
>>
>> TIA,
>> Bob
>>
>> --------------------------------
>> Bob Spidell - San Jose, CA
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