Have you re-checked the old problem with the head thermo houisng portion
bottoming out on the water pump casting.
That is exactly the solution for the same problem I had a long time ago.
*Never be beaten by equipment.*
On Wed, Aug 16, 2017 at 11:10 AM, JIm Gray via Fot <fot at autox.team.net>
wrote:
> I'm having a similar problem, never seen it before. I'm on a fresh built
> motor from the off season, top to bottom.
> I'm on my third top end tear down and can't find the compression leak.
> I've had all the liners out,
> Started out with .003 - .004 liner projection. Cold, pre-start compression
> was 210 +/- 3 lbs across
> all cylinders. After start and cam run in #'s 1 & 2 cylinders are 90lbs
> exactly. I've done this three times
> the first time with solid copper gasket, the second two times with Cometic
> composite gaskets.
> After the second time all liners were removed, and re-elevated to
> .004-.005 with thicker base gaskets.
> All the pistons out and re-ringed. It wasn't the rings, I was really
> hoping I got a couple compression rings
> in upside down but no.
> I use a torque plate every time a liner is removed to seat it squarely in
> the bore. Before that I used to
> use the head to seat them. Trying to cinch down a liner with a head stud
> was always futile because
> they will rock in their bores.
> The compression never returns to 210, after the first heat cycle on a new
> head gasket 1 & 2 drop to 90
> and stay that way. A cracked head is highly unlikely as it seems # 1 & 2
> are sharing the same compression leak
> 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
> it's getting past at the pushrod gallery. No compression getting into the
> cooling system or I/E ports.The gaskets do not show
> leaks like you would see after a common head gasket failure with either
> evidence of coolant passing through or
> hot gasses getting by. I have a total of about 65 minutes run time on the
> motor.
> All I can think of is some sort of block deformation going on. I bought a
> couple precision straight edges, the head is
> perfect, with the block in the car it's difficult to tell.
> 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
> end off of it though.
> jim g
>
> ------------------------------
> *From: *"timmmurphh--- via Fot" <fot at autox.team.net>
> *To: *"fot" <fot at autox.team.net>
> *Sent: *Wednesday, August 16, 2017 10:27:04 AM
> *Subject: *[Fot] FW: Grattan VSCDA next weekend?
>
>
>
> -----Original Message-----
> From: timmmurphh at gmail.com [mailto:timmmurphh at gmail.com]
> Sent: Monday, August 14, 2017 12:20 PM
> To: 'Tony Drews' <tony at tonydrews.com>
> Cc: ryan.murphy at fdlco.wi.gov; Steve Yott <tr4 at wi.rr.com>
> Subject: RE: [Fot] Grattan VSCDA next weekend?
>
> Sadly, we won't be able to make it.
>
> I just got the block back from the machine shop last Tuesday. Not enough
> time to get everything together and in the car and ready to go by Thursday.
> The good news is the liner stick out is the 0.004 the machine shop said
> they
> machined the liner seats and deck to. It's still a bitch to measure, as
> the
> liners "wobble" on the seats and when you're looking for 0.004 it's a
> problem. I finally have a decent dial indicator gage setup to at least
> give
> repeatable readings. The figure 8's used was a set of copper ones I had
> that measured 0.016. The machining was done on a single setup on a Rottler
> floor type vertical 4-inch spindle milling/boring machine. These are
> special purpose machine tools built specifically to machine engine parts,
> such as blocks and heads. After all the machining to get the stick out
> right I now have the pistons sticking up about 0.010 above the tops of the
> liners. No problem with the composite Payen head gasket.
>
> Thanks for all the responses to the Figure 8 gasket question. I did
> eventually hear back from Moss UK. They said their steel fig. 8's are
> 0.016
> and their copper fig. 8's were 0.018. No explanation regarding the
> different thickness other that they have not had reported problems with the
> gaskets. I'm not sure where the 0.020 thick copper ones that I measured
> came from or for that matter, the 0.016 thick copper ones I'm using.
>
> Tim & Ryan Murphy
> 1961 ('61, it is Comm. No. 511 and was built in 1961 per British Heritage)
> TR4 #317 BRG
>
> -----Original Message-----
> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Tony Drews via
> Fot
> Sent: Saturday, August 12, 2017 6:21 PM
> To: fot at autox.team.net
> Subject: [Fot] Grattan VSCDA next weekend?
>
> Anyone else going to Grattan next weekend?
>
> Vroom, vroom, Tony Drews
>
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