<html><body><div style="font-family: Arial; font-size: 12pt; color: #000000"><div aria-label="Compose body">I'm having a similar problem, never seen it before. I'm on a fresh built motor from the off season, top to bottom.</div><div aria-label="Compose body">I'm on my third top end tear down and can't find the compression leak. I've had all the liners out,</div><div aria-label="Compose body">Started out with .003 - .004 liner projection. Cold, pre-start compression was 210 +/- 3 lbs across </div><div aria-label="Compose body">all cylinders. After start and cam run in #'s 1 & 2 cylinders are 90lbs exactly. I've done this three times</div><div aria-label="Compose body">the first time with solid copper gasket, the second two times with Cometic composite gaskets.</div><div aria-label="Compose body">After the second time all liners were removed, and re-elevated to .004-.005 with thicker base gaskets.</div><div aria-label="Compose body">All the pistons out and re-ringed. It wasn't the rings, I was really hoping I got a couple compression rings </div><div aria-label="Compose body">in upside down but no.</div><div aria-label="Compose body">I use a torque plate every time a liner is removed to seat it squarely in the bore. Before that I used to </div><div aria-label="Compose body">use the head to seat them. Trying to cinch down a liner with a head stud was always futile because </div><div aria-label="Compose body">they will rock in their bores.</div><div aria-label="Compose body">The compression never returns to 210, after the first heat cycle on a new head gasket 1 & 2 drop to 90 </div><div aria-label="Compose body">and stay that way. A cracked head is highly unlikely as it seems # 1 & 2 are sharing the same compression leak</div><div aria-label="Compose body">since both are consistently 90 lbs. On a leakdown all I can hear is air in the crankcase. My best guess at the moment is</div><div aria-label="Compose body">it's getting past at the pushrod gallery. No compression getting into the cooling system or I/E ports.The gaskets do not show</div><div aria-label="Compose body">leaks like you would see after a common head gasket failure with either evidence of coolant passing through or</div><div aria-label="Compose body">hot gasses getting by. I have a total of about 65 minutes run time on the motor.</div><div aria-label="Compose body">All I can think of is some sort of block deformation going on. I bought a couple precision straight edges, the head is</div><div aria-label="Compose body">perfect, with the block in the car it's difficult to tell.</div><div aria-label="Compose body">I pretty much tabled my season before it ever started in May, ran out of time for it. I'm getting damn good at tearing the top</div><div aria-label="Compose body">end off of it though.</div><div aria-label="Compose body">jim g</div><div><br></div><hr id="zwchr"><div style="color:#000;font-weight:normal;font-style:normal;text-decoration:none;font-family:Helvetica,Arial,sans-serif;font-size:12pt;" data-mce-style="color: #000; font-weight: normal; font-style: normal; text-decoration: none; font-family: Helvetica,Arial,sans-serif; font-size: 12pt;"><b>From: </b>"timmmurphh--- via Fot" <fot@autox.team.net><br><b>To: </b>"fot" <fot@autox.team.net><br><b>Sent: </b>Wednesday, August 16, 2017 10:27:04 AM<br><b>Subject: </b>[Fot] FW: Grattan VSCDA next weekend?<br><div><br></div><br><div><br></div>-----Original Message-----<br>From: timmmurphh@gmail.com [mailto:timmmurphh@gmail.com] <br>Sent: Monday, August 14, 2017 12:20 PM<br>To: 'Tony Drews' <tony@tonydrews.com><br>Cc: ryan.murphy@fdlco.wi.gov; Steve Yott <tr4@wi.rr.com><br>Subject: RE: [Fot] Grattan VSCDA next weekend?<br><div><br></div>Sadly, we won't be able to make it.<br><div><br></div>I just got the block back from the machine shop last Tuesday. Not enough<br>time to get everything together and in the car and ready to go by Thursday.<br>The good news is the liner stick out is the 0.004 the machine shop said they<br>machined the liner seats and deck to. It's still a bitch to measure, as the<br>liners "wobble" on the seats and when you're looking for 0.004 it's a<br>problem. I finally have a decent dial indicator gage setup to at least give<br>repeatable readings. The figure 8's used was a set of copper ones I had<br>that measured 0.016. The machining was done on a single setup on a Rottler<br>floor type vertical 4-inch spindle milling/boring machine. These are<br>special purpose machine tools built specifically to machine engine parts,<br>such as blocks and heads. After all the machining to get the stick out<br>right I now have the pistons sticking up about 0.010 above the tops of the<br>liners. No problem with the composite Payen head gasket.<br><div><br></div>Thanks for all the responses to the Figure 8 gasket question. I did<br>eventually hear back from Moss UK. They said their steel fig. 8's are 0.016<br>and their copper fig. 8's were 0.018. No explanation regarding the<br>different thickness other that they have not had reported problems with the<br>gaskets. I'm not sure where the 0.020 thick copper ones that I measured<br>came from or for that matter, the 0.016 thick copper ones I'm using.<br><div><br></div>Tim & Ryan Murphy<br>1961 ('61, it is Comm. No. 511 and was built in 1961 per British Heritage)<br>TR4 #317 BRG<br><div><br></div>-----Original Message-----<br>From: Fot [mailto:fot-bounces@autox.team.net] On Behalf Of Tony Drews via<br>Fot<br>Sent: Saturday, August 12, 2017 6:21 PM<br>To: fot@autox.team.net<br>Subject: [Fot] Grattan VSCDA next weekend?<br><div><br></div>Anyone else going to Grattan next weekend?<br><div><br></div>Vroom, vroom, Tony Drews<br><div><br></div>_______________________________________________<br>fot@autox.team.net<br><div><br></div>http://www.fot-racing.com<br><div><br></div>Donate: http://www.team.net/donate.html<br>Archive: http://www.team.net/archive<br>Forums: http://www.team.net/forums<br>Unsubscribe/Manage:<br>http://autox.team.net/mailman/options/fot/timmmurphh@gmail.com<br><div><br></div><br><div><br></div><br>_______________________________________________<br>fot@autox.team.net<br><div><br></div>http://www.fot-racing.com<br><div><br></div>Donate: http://www.team.net/donate.html<br>Archive: http://www.team.net/archive<br>Forums: http://www.team.net/forums<br>Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/toodamnfunky@comcast.net<br><div><br></div><br></div><div><br></div></div></body></html>