Posted by buickanddeere on September 25, 2012 at 08:16:05 from (184.151.63.193):
In Reply to: Re: 53 series Detroit posted by bgreer75 on September 24, 2012 at 19:11:29:
Look at the service specs in your 53 series service manual. The air box pressure is iirc under 12 inches water column of pressure . Valves and piston ports are open at the same time. Now if a turbo is added which causes exhaust back pressure, then airbox pressure will be measured in psi while under load. Or if the cam timing is changed and/or sleeve port height is changed. There are at least two different sleeve port heights for the 53 series. There were 17 to 1 S engines. 19 to 1 turbo engines. 21 to 1 N engines. There may have been 25 to 1 military engines but they are considered some sort to proprietory military equipment not for public use.
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