Lotus Europa Community
Lotus Europa Forums => Garage => Topic started by: BERNIEHUMBER on Sunday,May 14, 2023, 04:55:47 PM
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HI:
In the process of getting some Plastigauge to make sure of main and crank bearing to shaft clearances.
What should I be looking for as min/max for bearing clearances?
The crank was reground somewhere in its life and I want to be sure of the bearing clearances.
I use 1 thou for ever 1 inch of crankshaft dia.
The main would be 2.2 thou and the crank 2.0 thou.
From those with experience in the 807 rebuild does that sound ok?
Thanks
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I check to see if I have the 807 specs specifically.
Have you seen this link ?
http://www.lotuseuropa.org/images/WorkshopManual/S2_Section_E_-_Engine.pdf
This is what I have on an 807 , see pic
Dakazman
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I went spelunking into my manuals and gradually remembered we've been here before. Renault doesn't list crank/rod oil clearances. They give crankshaft diameters and wear limits, but that's it. Going from LOTS of experience, the oil clearance should range between 1.5 thou and 3 thou with optimal being 2 thou to 2.5 thou. Anything less than 1.5 thou is just too tight, and above 3 thou, too loose.
If you are building a racing engine, you would 2.5 thou to 3 thou for a looser fit to suit an engine that is going to live in the higher rpm ranges.
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HI:
Thanks for the input.
I checked a Renault manual that includes the 807 and it didn't give me that reground clearance that I was after (like what you have shown Dakazman).
I hope this engine to be more of a reliable street engine with a bit of snap to it than anything else.
My Shannonville days are past me now.