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gledge wrote: Sun May 08, 2022 9:44 pm Hey I haven’t read all this thread but have you tried changing the apparent longest rod for the shortest one ... just to eliminate wrongly ground crankshaft?


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FbSTDwagon wrote: Sun May 08, 2022 5:48 pm HSD advise the max height above deck they do is .015” with a .045” head gasket. Which leaves .030” compression squish.

I am using on of Harvs late EJ style head gaskets which measures .060” thick, I’ll guesstimate no more than 10% gasket squish which will leave the gasket at .054” compressed thickness.

So even if the piston were .020” above deck there will be heaps of clearance, but when I get this issue sorted the pistons will all close to zero deck.

Which then leaves the next issue… with a zero deck why would I use a .060” head gasket?
All I’d be do is robbing my self of some compression, so after I get everything measured I may get a new gasket made up at .040” thick… but I’ll wait and see my findings first.

Harv wrote: Mon May 09, 2022 7:39 am

FbSTDwagon wrote: Sun May 08, 2022 5:48 pm HSD advise the max height above deck they do is .015” with a .045” head gasket. Which leaves .030” compression squish.

I am using on of Harvs late EJ style head gaskets which measures .060” thick, I’ll guesstimate no more than 10% gasket squish which will leave the gasket at .054” compressed thickness.

So even if the piston were .020” above deck there will be heaps of clearance, but when I get this issue sorted the pistons will all close to zero deck.

Which then leaves the next issue… with a zero deck why would I use a .060” head gasket?
All I’d be do is robbing my self of some compression, so after I get everything measured I may get a new gasket made up at .040” thick… but I’ll wait and see my findings first.

Rough guide: quench should be 38-43 thou. Run it down as low as 32 thou if you are not flogging the motor routinely. For ally rods (which grow more), run 60-65 thou.

Cheers,
Harv

FbSTDwagon wrote: Mon May 09, 2022 10:37 amAlthough the brain is ticking in getting some .040 gaskets made…

Harv wrote: Mon May 09, 2022 10:51 am

FbSTDwagon wrote: Mon May 09, 2022 10:37 amAlthough the brain is ticking in getting some .040 gaskets made…

Maybe coppery ones, from Ridgecrest:
https://coppergasket.com.au/

Cheers,
Harv

EK283 wrote: Mon May 09, 2022 11:30 am So I have read this in detail and to be honest it is all a pain in the neck to get right especially when you have to rely on others to do work.
I would do the following.
Measure all piston gudgeons to top to make sure they are equal.
Measure all conrods big end to small end.
With your crank in measure each journal at top dead centre with your deck gauge.
You will have all the information then and how to overcome it.
Crank, because it has been machined undersize it is possible that it’s offset ground. That’s a problem.
Conrods, pick the ones that are equal then get some more and have the closed and honed to match the others.
Pistons, I find it hard to believe they could be different but you never know ! Machining the tops is one way around it but they will have to be rebalanced of course.

Ultimately if it was slapped together with all different measurements it would still go fine and you probably wouldn’t notice the difference !

Welcome Drew to the world of blueprinting !!!

Regards Greg

Errol62 wrote: Mon May 09, 2022 12:19 pm Good advice on matching the higher crown to larger CC, but as Greg says good to know where the problem is. Big end journals ground -0.01" I would think it possible to be the issue but money on the rods.

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