[Fot] Liner Protrusion, TR-4

[Greg Blake]

In response to your piston question, nope. Several of us in CVAR still run with 87mm pistons.  

Greg

Sent from my iPhone

> On Dec 16, 2015, at 10:47 AM, davehogye <dlhogye at comcast.net> wrote:
> 
> Hi Mike,
> That's a tough call.  Fortunately for me, I had Greg Solow advising me during my build.  When I first checked the protrusion, I had really low measurements along one side of the block.  I actually had the block machined on a slight angle to clean it up.  That gave me higher protrusion than the .003-.005" spec. at .006-.007".  So I think it's better to be on the high side than shorter than .003" of the factory spec.
> If I recall correctly, when I torqued the head without a gasket in place it went to .001" around 40lbs. of torque with the .006-.007" protrusion.  So something is squishing or giving quite a bit when the head is getting torqued.  
> This is why a torque plate should always to used when the liners are bored.  The liners change shape under pressure.
> I wouldn't get too hung up on what is happening with the head on torque measurement, but .008" with the head off seams a little high.  But I thought .006-.007" was high too.
> Really, at that point I decided to just put the thing together.
> With the head off, are you still getting .008" protrusion?
> The only reasonable thing you can do to change that, is change the figure 8 or take a little off the top of the liners.
> Perhaps Ken can advice you better than me.
> Man, is everyone using 89mm pistons now?  
> 
> Dave
> 
> 
> From: "Michael Moore" <mmoore at mtmcpafirm.com>
> To: "Tony Drews" <tony at tonydrews.com>
> Cc: "davehogye" <dlhogye at comcast.net>
> Sent: Wednesday, December 16, 2015 5:18:03 AM
> Subject: RE: [Fot] Liner Protrusion, TR-4
> 
> Tony and Dave,
> 
> This is my first racing engine rebuild (2nd engine rebuild I have ever done), and I am trying to figure out each step as I go, so any advice would really help. I have read Tony's rebuild tips on the web, and Kas books. But it's sometimes hard to put word in correct actions.
> 
> I am currently fitting new liners I got from ken Knight, I assume these are ones you got Tony.
> 
> With them held in by bolts and washers torqued to 40lbs I had .007 protrusion, using .015 steel figure 8s, the copper I have are .020, so I assumed too thick.
> 
> After talking to Mordy Dundst, I put on head without gasket, before tightening I had .008 between deck and head. After tightening to 40lbs I could barely get .003 between head and block. Something doesn't seem right.
> 
> Can you guys advise on what I am doing wrong, or what I should do?
> 
> 
> Thanks, Mike
> 
> 62 TR4, Race car
> 63 TR4, Street car
> 
> Mike & Becky Moore
> 6050 Ruhl Road, Fairview, PA 16415
> 
> mmoore at mtmcpafirm.com
> 
> 
> 
> 
>  
> -----Original Message-----
> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Tony Drews
> Sent: Tuesday, December 15, 2015 9:13 PM
> To: fot at autox.team.net
> Subject: [Fot] Liner Protrusion, TR-4
> 
> Quick question re: liner protrusion in a wet liner engine.  My new liners dry fitted with "stock" figure 8 gaskets (0.020" thick) have 0.010" protrusion.  Too much, I know.  So, I'm going to make my own fig 8 gaskets out of shim stock.  I have my choice between 0.015" 
> shim stock and 0.012" shim stock which would give either 0.005" or 0.002" protrusion dry.  Any thoughts on which way I should go?  I'm assuming that when I put some goo on the fig 8 gaskets to ensure that they seal that I'll get another thou or two protrusion so would go with the 0.012" shim / 0.002" protrusion.
> 
> I'll be running the Cometic gasket with the fire rings.
> 
> TIA
> 
> Cheers, Tony Drews
> 
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