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Old 01-13-2019, 02:42 PM   #1
woody56usmc

Name: woody56usmc
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155 degree or 145 degree pistons?

Hey guys Iím building an engine and I have 2 engines to choose from. Both are 12 valve Cummins. One is an 89 with marine style pistons and one is out of a 93. I have a Farrell Diesel stage 4 P7100 to put on the engine I choose to rebuild. Here is my question....is there an advantage to using the 155 degree pistons over the 145 degree pistons? I believe there would be a slight advantage with the 155 degree pistons but not sure how much. However, Iím not an expert so does anyone have any thoughts on this?

Thanks


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Old 01-13-2019, 10:53 PM   #2
cummin get it
 
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With the larger angle you can run more advanced timing and still spray in the bowl.
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Old 01-13-2019, 11:39 PM   #3
Rich dzl

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155 marine is the best for performance ,145 degree is an emissions based piston.
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Old 01-14-2019, 06:29 PM   #4
woody56usmc

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Thanks guys! Thatís what I was thinking I just wanted to make sure lol


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