LML How strong/reliable are lml delipped pistons

Fingers

Fingers

Village Idiot
Vendor/Sponsor
Apr 1, 2008
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White Oak, PA
One of the features reducing piston strength was the wide wrist pin area on the LBZ - LLY Pistons. T
I have not seen the LML design to comment intellegently about them.

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MAXX IT OUT

MAXX IT OUT

Neglected
Mar 1, 2013
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Des Moines, Iowa
juddski88 said:
Do you know why the lip is removed to start with?
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I was referring to this and yes I know what and why delipping.
Fingers said:
This is a spin off from another thread.

I am nearly done with my piston bowl design and hope to cut the first one this weekend. I have used a FEA program to try and refine what I think is a reasonable compromise that does not require a significant reduction in compression ratio.

For background, here is the analysis of a stock LLY piston showing where the stress exceeds the strength of the material.

attachment.php


And here is a delipped piston under the same load. Note that it is NOT stronger than the stock piston.

attachment.php


Here is my latest design:

attachment.php


This maintains the stock compression ratio leaving some room for valve relief cuts if need be.

IF the FEA can me trusted, the design is 50% stronger than the stock configuration.

The cast pistons have a steel band embedded in them which I need to miss for the new design. So wish me luck when I cut the first one since I don't know exactly where it is on the blanks I have bought for this project.
Click to expand...
 
MACKIN

MACKIN

Smell My Finger...
Aug 14, 2006
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