Lotus Elan

What is going on with my rebuilt engine?

PostPost by: 2cams70 » Thu Aug 22, 2019 6:04 am

You don't need upgraded main bearing caps unless your block is earlier production with the rounded type caps (120E, 2731E, 681F). These days the cap mounting face on the block is typically ground down very slightly prior to line boring with the cap in place in order to avoid the need to fit bearings with oversize OD. This moves the crank centreline a couple of thou toward the cylinder head deck surface.
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PostPost by: rgh0 » Thu Aug 22, 2019 7:23 am

You can line bore with new steel caps for the standard bearing shell O/D

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PostPost by: benymazz » Thu Aug 22, 2019 12:34 pm

2cams70 wrote:You don't need upgraded main bearing caps unless your block is earlier production with the rounded type caps (120E, 2731E, 681F). These days the cap mounting face on the block is typically ground down very slightly prior to line boring with the cap in place in order to avoid the need to fit bearings with oversize OD. This moves the crank centreline a couple of thou toward the cylinder head deck surface.


Yes, the block is a 120E with the rounded caps. Good to know about the line boring, thanks.
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