Marine pistons?

AsTroSS

AsTroSS

problems start @80 psi
How many different type/designe Cummins Marine pistons are in the market.

I knew at least 3 different:

1. Cummins orignal , teflon coated side

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2. Cummins original, non coated

Sorry I can't find better picture :doh:

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3. Mahle 155*

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Any others ?
 
Smokem said:
The ring landings are different on the first piston from the other two.
Click to expand...
What the ring landing mean?

Piston ring location to top of the piston or cap between two compression rings?



Cummins marine piston area between two compression rings are: 6 mm (0,236 inch)
and in Mahle : 14mm (0,551inch)

I do not undestand, why Cummins Marine piston is weaker than Mahle, even if they have more material around piston pin area.


Are the pistons no 2 and 3 same in my first post?
 
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Smokem said:
What is the depth from the top of the piston to the top ring landing on the pistons you have with the 155* bowl? A stock 24v piston has a compressioin ring gap of 14mm, top ring landing from the top of the piston is 10.5mm, and the bottom compression ring to the oil ring gap is 4mm.
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:thankyou2:

Whats the reason why big ring landing and big compression ring cap is better?



Do you knew why Cummins Marine piston compression rings are located on top of piston (small ring landing and very small compression ring cap)?

I think there should be good reason, because Marine engines are made for high EGT and high output.
 
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last time i priced a marine piston with the steel ring grove inserts from cummins. i belive they were 175 bucks or so each. i thought that was the biggest differance.
 
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