[Tigers] Fwd: Restated: Mistake in Performing Tiger's Valve ClearanceCheck

[Jay Laifman]

I’m confused.  Why are you asking?  It sounds like you think you have cracks in the pistons because you used clay before and you are considering taking apart the engine.  But you are not sure you have cracks, so you are asking about the clay.  

If that is true, perhaps the first question to be considered is why do you think you have cracks?   And if you have them, it would seem irrelevant whether or not the clay was the cause.


Begin forwarded message:

> From: Tom Witt via Tigers <tigers at autox.team.net>
> Date: January 23, 2018 at 11:58:45 PM PST
> To: "Tiger's List" <tigers at autox.team.net>
> Subject: Re: [Tigers] Restated: Mistake in Performing Tiger's Valve ClearanceCheck
> Reply-To: Tom Witt <atwittsend at verizon.net>
> 
> 1 cubic inch is 16.4 CC’s. The combustion chamber is at least 49cc’s and likely larger towards 54cc’s (or more, I don’t have my combustion chamber numbers floating off the top of my head). The clay is pliable and would only squeeze into a void area of which there is at least three times its volume in space. And think of it this way, the cylinder pressure is upward of 150 PSI - and that is even before ignition.  My guess it is HIGHLY improbable that the clay being offset would cause a piston skirt to crack. Push a piece of clay under your finger and see that the finger doesn’t bottom out on the surface it is pushed onto with virtually no clay underneath.
>  
> <image[1].png>
>  
> From: Rob Hogan via Tigers
> Sent: Tuesday, January 23, 2018 9:17 PM
> To: Tiger's List
> Subject: [Tigers] Restated: Mistake in Performing Tiger's Valve ClearanceCheck
>  
> BECAUSE approximately a 1 sq. in. small flat of modelling clay was placed (not near the piston's periphery) in the squish area of the piston instead of only under the head's combustion pocket, would the assembled piston and rod's rotation have caused the piston to cant in the cylinder bore enough to crack a piston skirt?
>  
> Is there any other potential weak area that could be cracked by piston to head interference with clay in between?
>  
> I hesitate to disassemble the engine to search for possible part cracking if the clay interference is really incapable of causing something to crack.
> 
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