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Old 05-26-2008
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4-108 compression?

Does anyone know what are the compression specs on a perkins 4-108 are supposed to be?
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Compression ratio on a 4-108 is listed as 22:1 in the Perkins Workshop Manual.

Bill
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Old 05-26-2008
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Around the 420 lb range
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Old 05-27-2008
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At 22:1 the compression in PSI would be appx. 330; but if your engine is at 420 that might be the gauge pressure produced when cranking.
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For the mathematically inclined the bore is 3.125" with a stroke of 3.5" and is of course a 4 cylinder. The manual has the displacement of 107.4 cubic inches. As mentioned earlier the ratio is 22:1. I am looking for the serviceable wet and dry cylinder compression values. The wet test came in at 490 psi. exactly the same for all 4 cylinders. Can anyone confirm? Thanks
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