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Old 11-25-2011, 04:38 PM   #3 (permalink)
oil pan 4
EV convert
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Join Date: Jul 2011
Location: NewMexico (USA)
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Sub - '84 Chevy Diesel Suburban C10
90 day: 19.5 mpg (US)

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The problem with running low tension (about 5 to 10 pounds) or very low tension (3 to 5 pounds) with an engine that draws a strong vacuum is the possibility of increased oil consumption.
Gassers that do run low or very low tension usually run vacuum pumps (maintain no more than 8 to 10 inches of Hg).
There is a new dodge that runs low tension rings but the block has been engineered to maintain bore roundness through heating cycles and many thousands of miles of driving.

The only way we can get close to that engeering is to have your block machined while torqued with a deck plate, mains torqued and block heated to near operating temperature.
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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