Head Gasket - Page 6 - LotusTalk - The Lotus Cars Community
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post #101 of 102 (permalink) Old 09-06-2019, 10:22 AM
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Originally Posted by jtrealty View Post
If you did have a gasket failure it most certainly could be the "nip" not to spec. Do you by any chance have the measurements from the last head job? Not only is there a spec on the necessary minimum and maximum, there is a certain amount allowed between each cylinder and it has to be in an ascending order.
David Teitelbaum
I can't find my notes with the nip measurements, but I do remember spending some time juggling the new JAE provided liners to get the most even taper with my block. I think the service notes show a lower number than Changes recommends for iron liners (.004").
I'll check them again when I pull it apart.

1985 BRG Turbo Esprit
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post #102 of 102 (permalink) Old Yesterday, 07:29 PM
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Pulled the head, and the gasket failed in the same spot, top of the cylinder on the intake side of #3 and 4.

When I went to zero my nip gauge, I realized it was not totally flat, so no nip #'s yet.

Disassembly torque on the head nuts seemed low, at about 50ft/lbs to release the nut, but I have no frame of reference on how much they relax with heat cycles and gasket compression, let alone the thread lubrication situation. It went together with at least 90 ft/lbs and ARP lubricant. Hate to think I need to re-torque the nuts after break-in...

CC'd the head (37cc) and piston recess (27cc) @ TDC and with gasket volume I think that gives me a 8.39:1 static compression ratio.

1985 BRG Turbo Esprit
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