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 Posted: 10-06-2005 01:56 pm
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Ian S

Joined: 04-05-2005
Posts: 5

I have some questions on ring gap sizes for standard bore on 2.2ltr engine build, using either deves or moly rings

lotus recommend for the lotus sunbeam -  15 - 20 thou no. 1 ring

                                                                   19 - 24 thou no. 2 ring

which is the best ring set to use for a fast 2.2 road car, along wth the best size for the ring end gaps?



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 Posted: 10-06-2005 09:45 pm
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Greg Fletcher

Joined: 03-11-2005
Location: Lake Nacimiento, California USA
Posts: 421
Moly rings are superior in durability and longer life, although the break-in period is longer. The rule of thumb is that moly rings tend to transfer heat more efficiently away from the piston and to the block, which is always desirable.

The ring gap recommendation is set by the ring manufacturer so don't go necessarily go off the old Lotus spec. All the ring kits come with recommendations for various engine configurations: stock, track, sprint, etc. For the specific moly rings we sell in the club store (again, this may vary by manufacturer, if you don't purchase these rings- check the instructions that come with yours), for a peppy street motor, the manufacturer recommends .004" per inch of bore on top and .005" per inch of bore on the number 2 ring. Figuring an approximate 3.75 bore on this engine (they vary of course), it's safe to plan your gap in the 14-16 thou for the top and 17-19 thou on the 2nd ring.

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