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Old 01-25-2012, 05:05 AM   #77 (permalink)
oil pan 4
EV convert
 
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Quote:
Originally Posted by IamIan View Post
then I to would never have to leave lean burn .... hmmmm....
The problem with staying in lean burn under heavier load is it can cause pre-ignition and possibly burn exhaust valves.
Spending much time under load in 13.2 and/or 15.7 to 1 air fuel ratios burns exhaust valves.
13.2:1 creates the most torque and highest EGTs, but EGTs and NOx peak at 15.7:1.
Anything much leaner than 16:1-17:1 (around where honda lean burn is) burns at a good temperature but doesn't create much power, getting up to speed on the highway, passing and going up mountians could become a problem.
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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.
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