Pin height pop quiz

[2eighTZ4me]

I'm a JE piston with a 33.5mm pin height. I want to live in a stock L28 F54 block. What has to go underneath me to accomplish this?

 

If I refer to the following information (and have no reason to believe it is not true) http://www.zhome.com/rnt/L28conversion/3031FAQ.html

 

Then block height is 207.9mm.

Rod length for a 240 rod is 133mm

Pin height (the JE piston above) is 33.5mm

 

SO.....If I use a stroker crank at 83mm THEN,

 

I take half of the throw of the stroker crank 83mm/2 = 41.5mm - then add pin height 33.5 + 41.5 = 75mm

 

Then - 207.9mm - 75mm = 132.9mm - meaning the 240 rod on a stroker crank with these pistons would bring me to .1mm under the deck, and therefore I would not need a 2mm head gasket.

 

Reason I ask - I got these pistons yesterday and mic'd them up and this is about the only combo I can think of that would yield what the original purchaser was going after. The OP is currently residing under the "where are they now" column....hence the question.

 

Can someone confirm if my math is correct before I plunk down the bones for these slugs?

[Xnke]

Yes, the above combination would work. However, that is not the ONLY combination that would work.

 

Are these flat top or dished pistons?

 

For Max Piston speed under 1100m/min, the cast piston redlines are acceptable.

 

L24 crank and L14 rods would also fit, with .9mm deck clearance, for 2.5L and 1.8 R/S ratio, cast piston redline of around 7300RPM

 

L20A crank and L13 rods would also fit, with a -.4mm deck clearance, for 2.4L and a >2 Rod/stroke ratio and a cast piston redline of about 7800RPM

[2eighTZ4me]

These are JE forged pistons, and they'll be ceramic coated on top and sides. They are of the dished variety - and a rather deep dish at that. Going with the stroker setup. I believe this should work out just fine.