I was wondering if anyone knows a good place to find 370 Marine Pistons? I'm looking for just a plain set, no fly cuts or coatings. There may a possible 1st Gen build-up in the future, Thanks. :smoke: :smoke:
Thanks for the replies, I wasn't sure who might have the best price Piers-Haisley-Cummins. Does anybody know what they go for, roughly? I've been to Jeff's shop a couple of times and I understand why Cummins South doesn't want to recommend anything he does. He is straightforward in telling you what you do and don't need. Plus he makes more power in these little engines than most people that work at Cummins would believe with many of the stock internals, and that's bad for the parts business. I met many nice people while I was there, and had a great time at his shop and the track. :smoke: :smoke:
The reason some people machine the factory piston is to retain some of the stock compression but still have the larger piston bowl. The marine pistons that Van Haisley machines the dome out of will yeild a compression of around 13:1 I believe.
This is why I'm not a fan of 370 injectors in a land motor, not how the spray pattern is outside of the piston bowl, and also how different the spray pattern looks from one nozzle imprint to the other. The spray pattern of a 370 injector is 155 degrees, the piston bowl on the land motor is 145 degrees, this poor atomization and delivery of fuel outside the piston bowl leads to excess smoke and heat. The 370's are a good injector for the money, but I believe that they are not a great injector without being honed and matched to a specific piston bowl. At the time this motor was runnig 370 injectors with 18* of timing, with more advanced timing the spray pattern would be wider.
most shops will tell you to have your stock tips burned out to .12 ( = to a 370) that way it stays in the bowl. I was told a staock piston is good to
23.5* of timming befor you get outside the bowl, where a marine piston is good to 40* with staock spray angle before it gets outside the bowl.
I thought I should add a little info to this list, I forgt to mention the 3rd Gen injectors. Also if you hear injector flow measred in microns, 1 thousandths~39 microns.
Marine 370's are actually 0.012's of an inch. But that is a very good and very true statement. This is also why I wouldn't recommend running over 24* of timing on a truck that is daily driven.
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