Re: Detroit 4-71

Posted by buickanddeere on June 21, 2007 at 21:12:25 from (216.183.132.114):

In Reply to: Detroit 4-71 posted by Roy Suomi on June 21, 2007 at 20:55:46:

The two stroke Detroitas have a flat torque curve compaired to a four stroke. A four stroke tends to have sharp peak in both the torque and HP curves.
The detroit's flat torque curve meams it's allways giving her best torque fro idle to redline rpms. HP just varies with rpms. Unlike a four stroke that has to be lugged down to peak volumetric efficiency rpms to obtain peak torque.
The end result is that a 200HP detroit can feel underpowered to those used to 200HP four strokes.
The Detroit two stroke isn't the most fuel efficient engine out there. It is however very reliable and costs less than a just a set of emmissions fourstroke common rail injectors to rebuild an entire two stroke.
Make certain it's the later high compresison N engine rather than the hard to start S series. The S engines smoke more too. If replacing injectors use the C series, they are better than even the N injectors.
The gasser rear gear ratio will be plenty high for the diesel. A 53 four valve can run 2800rpm however a 71 series isconsidered a 2300rpm motor. Unless of course it has military parts in the valve train. Then 2800-2900 for brief spurts is ok.

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