Assuming you have cut the head down a bit, do you think the top compression
ring is opening into the intake valve/pocket relief at the top of the liner
and blowing past the ring? If you are .010" out of the hole, there is not
much left at the top ring landing.
On Wed, Aug 16, 2017 at 6:27 PM, fubog1 via Fot <fot at autox.team.net> wrote:
> Check the gasket thickness, it depends on what piston/wall clearance,
> rods, and RPM you use.
> You generally need around .030 piston/head with stock rods, so add that to
> your pop-up of .010 for minimum gasket thickness.
> If you run good rods you can run a little less before the pistons smack
> the head.
> It's perfect when there isn't any carbon build up on the piston tops under
> the squish area.
> When it's not right, it goes BRRRRRRRRRRRRR...
> HTH
> Glen
>
>
> 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.
>
>
>
>
> -----Original Message-----
> From: timmmurphh--- via Fot <fot at autox.team.net>
> To: fot <fot at autox.team.net>
> Sent: Wed, Aug 16, 2017 5:48 pm
> Subject: [Fot] FW: Grattan VSCDA next weekend?
>
>
>
> -----Original Message-----
> From: timmmurphh at gmail.com [mailto:timmmurphh at gmail.com
> <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 <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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