<font color='black' size='2' face='Arial, Helvetica, sans-serif'>W<font size="2">ith the good rods and reasonable rpm you have plenty of clearance.<br>
You don't want too much clearance either cuz then it lessens the "squish" effect.<br>
The idea is to have enough clearance for all running conditions, plus a few thou safety margin, and no more.<br>
Glen<br>
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<div style="font-family:arial,helvetica;font-size:10pt;color:black">-----Original Message-----<br>
From: timmmurphh <timmmurphh@gmail.com><br>
To: 'fubog1' <fubog1@aol.com>; fot <fot@autox.team.net><br>
Sent: Wed, Aug 23, 2017 3:38 pm<br>
Subject: RE: [Fot] FW: Grattan VSCDA next weekend? piston/head clearance<br>
<br>
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<div class="aolmail_MsoNormal">The Payen head gasket last used was compressed to 0.055 at the fire ring. So, with the 0.010 pop-up that I have from the all efforts to deck the block, I will have 0.045 clearance. I have Carrillo rods and we try to stay to under 6000 RPM for engine “longevity”. (Not sure “longevity” is a term that can be used with a race engine!) At the most we’ll hit 6200 or 6300 RPM briefly before upshifting. Therefore, I should be within the 0.030 clearance that you recommended. It will be interesting to see what the top of the pistons looks like on the next rebuild with regard to carbon build up in the squish area.</div>
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<div class="aolmail_MsoNormal">Thanks for the advice and all the other comments on this subject. All much appreciated. Still a lot to learn<span style="font-family:"Segoe UI Emoji",sans-serif">😊</span></div>
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<div class="aolmail_MsoNormal">Tim</div>
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<div class="aolmail_MsoNormal">P.S. Finally got everything together on the engine and about ready to mate up to the transmission and put back in the car. Looking forward to ELVF next month. That will be the test.</div>
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<div class="aolmail_MsoNormal"><b>From:</b> fubog1 [<a removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:fubog1@aol.com?">mailto:fubog1@aol.com</a>] <br>
<b>Sent:</b> Wednesday, August 16, 2017 5:27 PM<br>
<b>To:</b> <a removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:timmmurphh@gmail.com">timmmurphh@gmail.com</a>; <a removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:fot@autox.team.net">fot@autox.team.net</a><br>
<b>Subject:</b> Re: [Fot] FW: Grattan VSCDA next weekend?</div>
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<div class="aolmail_MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Check the gasket thickness, it depends on what piston/wall clearance, rods, and RPM you use.<br>
You generally need around .030 piston/head with stock rods, so add that to your pop-up of .010 for minimum gasket thickness.<br>
If you run good rods you can run a little less before the pistons smack the head.<br>
It's perfect when there isn't any carbon build up on the piston tops under the squish area.<br>
When it's not right, it goes BRRRRRRRRRRRRR...<br>
HTH<br>
Glen</span></div>
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<div class="aolmail_MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">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.</span></div>
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<div class="aolmail_MsoNormal" style="margin-bottom:12.0pt"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">-----Original Message-----<br>
From: timmmurphh--- via Fot <<a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br>
To: fot <<a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br>
Sent: Wed, Aug 16, 2017 5:48 pm<br>
Subject: [Fot] FW: Grattan VSCDA next weekend?<br>
<br>
<br>
<br>
-----Original Message-----<br>
From: <a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:timmmurphh@gmail.com">timmmurphh@gmail.com</a> [<a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:timmmurphh@gmail.com?">mailto:timmmurphh@gmail.com</a>] <br>
Sent: Monday, August 14, 2017 12:20 PM<br>
To: 'Tony Drews' <<a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:tony@tonydrews.com">tony@tonydrews.com</a>><br>
Cc: <a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:ryan.murphy@fdlco.wi.gov">ryan.murphy@fdlco.wi.gov</a>; Steve Yott <<a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:tr4@wi.rr.com">tr4@wi.rr.com</a>><br>
Subject: RE: [Fot] Grattan VSCDA next weekend?<br>
<br>
Sadly, we won't be able to make it.<br>
<br>
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>
<br>
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>
<br>
Tim & Ryan Murphy<br>
1961 ('61, it is Comm. No. 511 and was built in 1961 per British Heritage)<br>
TR4 #317 BRG<br>
<br>
-----Original Message-----<br>
From: Fot [<a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:fot-bounces@autox.team.net?">mailto:fot-bounces@autox.team.net</a>] On Behalf Of Tony Drews via<br>
Fot<br>
Sent: Saturday, August 12, 2017 6:21 PM<br>
To: <a target="_blank" rel="noopener noreferrer" removedlink__d3b45dc0-8b34-4dca-93f0-20eb50788549__href="mailto:fot@autox.team.net">fot@autox.team.net</a><br>
Subject: [Fot] Grattan VSCDA next weekend?<br>
<br>
Anyone else going to Grattan next weekend?<br>
<br>
Vroom, vroom, Tony Drews<br>
<br>
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