[TR] TR4A Aluminium Head

[Bill Beecher]

I have 86mn pistons, do I need a 91mm to outskirt the liners?  Is Comtic the best head gasket for aluminum heads?

Straightedge show no sign of warpage, and no visible damage any where now that it is cleaned.  

Tom, how hot and how long in the oven?  Can I just sneak it in under Momma's biskets?

Many thanks to all,

Bill


Sent from my Altair 8800

On Apr 4, 2017, at 10:34 AM, Tony Drews <tony at tonydrews.com> wrote:

Definitely has the symptoms of blown head gasket.  I've had much better luck with compressible gaskets than solid ones.  Solid ones need liner protrusion to be PERFECT.

The Aluminum heads have the intake valves unshrouded like you'd get if you milled a stock head.  My latest head gaskets have been Cometic ones.  On line their store lists 88 mm gaskets but if you call you can get a 91 mm gasket.  This is almost large enough diameter to keep the fire ring completely out of the combustion chamber.  Steve Yott was having some 92 mm ones made of a similar design.

I can't comment much on the head itself - I know one of my racing competitors ran an aluminum head for a few years and had constant head gasket problems so went back to iron at some point.

Regards, Tony

At 06:53 PM 4/3/2017, Bill Beecher wrote:
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> Happy Monday List,
>  
> Have had a problem with some water up in the rocker area of the TR3(TR4A Motor) ever since I bought it last year.  Just now getting to a point where I can pull the head and see if I can see what the issue is.  Below are my observations:
> 1. Did not know it was an aluminum head until today, re-torqued it last year when I first saw this problem at 95lbs.  Learned today it should be 70lbs.
> 2. Runs great, compression checks out good at 150-55 across all.  But after getting up to highway speeds then coming back to town it quickly overheats and blows the water past the rad cap.
> 3. Cannot see any damage to the solid copper head gasket.  Is this the right type gasket for an aluminum head?
> 4. Cannot see any damage to the head, how do you check an aluminum head?  I would think that magnaflux would not work here.
> 5. Drained and checked the oil last fall, no water present in the case.
>  
> Any suggestions from the collective wisdom would be greatly appreciated, seems this motor was intended for some level of performance as it also has Moss�s roller rockers. 
>  
> Many thinks to all,
>  
> Bill B
> TS30800L
>  
>  
>  
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