excessive crankcase psi
Race Director
Joined: Jan 2003
Posts: 17,696
Likes: 3,683
From: Central Arkansas
I would say that a high level of positive pressure in the crankcase itself would not cause bogging or stalling - but the mechanical conditions creating the high positive pressure in the crankcase possibly could if serious enough.
Safety Car
Joined: Sep 2004
Posts: 4,049
Likes: 134
From: St. Clair Shores MI
C2 of Year Finalist (track prepared) 2019
2017 C2 of the Year Finalist
I don't know enough about the crankcase venting on a '63 to say for certain, but when I fried the rings out of my 66, it puked oil like a college freshman at 3000 RPM and above, and it never stalled..........
Race Director
Joined: Oct 2005
Posts: 12,470
Likes: 1,548
From: Camp Verde AZ
C1 of Year Finalist (performance mods) 2019
2017 C1 of Year Finalist
No. You could have 1000 PSI inside the crank case, and as long as the seals didn't blow out, it wouldn't make any diff. Of course ignoring increased friction from pushing compressed air around vs atmospheric air.
There is no net change in crank case volume during running vs stopped, so no difference.
Doug
There is no net change in crank case volume during running vs stopped, so no difference.
Doug
Team Owner
Joined: Aug 2007
Posts: 58,061
Likes: 7,146
Army
Yup. Excessive blow by is one source of crankcase pressure.
Le Mans Master
Joined: Feb 2008
Posts: 6,508
Likes: 1,927
From: Folsom CA
I saw a 427 that had excessive blow by, it would actually blow the valve cover out.
Found out the cylinders were bored wrong on a recent "rebuild". The rings would not seat on the poor cross hatch finish. It actually ran perfectly but had smoke and huge blow by.
It took a new hone and new rings to fix.
Found out the cylinders were bored wrong on a recent "rebuild". The rings would not seat on the poor cross hatch finish. It actually ran perfectly but had smoke and huge blow by.
It took a new hone and new rings to fix.
