blow by? This can't be normal
Thread Starter
Melting Slicks
Joined: Aug 2000
Posts: 2,009
Likes: 1
From: Springfield MO
blow by? This can't be normal
After doing a cam/head swap on a 2000 I am seeing oil spit out of the dip stick (when it is pulled out of the tube) at idle. It quits as the engine revs. The cam is really aggressive (in the ball park of 245 248 ish at .050 and a little above .600 lift on a 112. The compression is around 11.5:1. Oil pressure at idle is 48 psi via a ported LS6 oil pump.
The work was done by a professional and well known ls1 specific shop. It ran for 2 weeks before it got to the point of blowing the dipstick out and massive amounts of oil everywhere. We did a leak down on it and discovered 5,7,and 8 had terrible results. So we pulled the heads and found oil in between the layers of gasket (cometic). That should say that the gasket didn't seal right? Anyways, the cylinder walls looked great. You could still see the original machining marks. Now upon reassembly (with GM head gaskets and ARP bolts) we are seeing oil being spit out of the dipstick tube. I plan on re-torqueing the heads and doing another leak down on it as soon as it cools.
Has anybody had similar problems before?
The work was done by a professional and well known ls1 specific shop. It ran for 2 weeks before it got to the point of blowing the dipstick out and massive amounts of oil everywhere. We did a leak down on it and discovered 5,7,and 8 had terrible results. So we pulled the heads and found oil in between the layers of gasket (cometic). That should say that the gasket didn't seal right? Anyways, the cylinder walls looked great. You could still see the original machining marks. Now upon reassembly (with GM head gaskets and ARP bolts) we are seeing oil being spit out of the dipstick tube. I plan on re-torqueing the heads and doing another leak down on it as soon as it cools.
Has anybody had similar problems before?
Pro
Joined: May 2004
Posts: 744
Likes: 0
From: St. Peters MO.
No issues with a blowing dipstick, but since install of a cam my ride likes consuming oil. After researching the LS style engines PCV problems and now your issue of the dipstick there's got to be something in the design that's not just right. Should be interesting to watch the new LS2 to see if GM has addessed the problem that really doesn't exist, "yeah right".
