ill read that pulling guys often switch to marine pistons. is this jus bc of the bowl config.?

 

yea I think it's just for the bigger bowls.

 

there also .20 less than stock so if you run a +.20 HG and -.20 pistons you get =.40 over stock lowering your compression and allowing more air into the cylinder = more bang for buck

 

Well i'm overhauling my truck and am thinking on buying a marine kit. alot of the external mods will come later but question is will it still run well w/ alot of the stock parts? obviously changing the timing with it tho.

 

Shoe

a marine engine (12 valve ) has horsepower range of 220, 310, 370.

these engines use the same components you use in your dodge truck, the only parts that your truck dont have are the following.

hx40m turbo
heat exchanger
sea water pump
intercooler (some people have put them on there trucks)
wet manifold

most of your marine engines use the CAV pump, instead of the inline or the VE

a Cummins motor that is well maitained can take 400 horsepower safely and last a long time.

 

What ever happened to ceramic piston crowns? About 10 or 15 years ago, they were supposed to be world-changing technology, but, where are they?

 

Marine pistons with around 15.3 compression ratio, as opposed to wherever in the 18~ish range the stock compression ratio is, will cause noticeably more blue smoke while cold and sluggish non-boost response. I wouldn't recommend it for a daily driver.

 

Ceramics are still out there, they don't seem to be as popular due to price which kinda leaves them for the all out diesel enthusiast, it's overkill for anyone else. I've also heard of the ceramic on top of the piston cracking/failing and I believe they just ceramic coat the skirts for less drag now. Still aids in high temp stability just doesn't block all the heat up top, only helps pull the heat away. Anyone else have more insight?


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So the lower compression doesnt allow it to burn as clean?

If i can find a good price for coating i wanted to go for it. I have one guy in mind but i havnt talked to him yet.

 

The engine can only handle so much pressure above the piston before stuff breaks. The engine designer has two options to make pressure above the piston; he can increase compression ratio, or he can cram more air into a lesser compression ratio.

More air burns more fuel, so you'll make more power with more air crammed into a lesser compression ratio. But low compression ratios cause lower combustion temperatures when you're not cramming in tons of air; this causes inefficient burning at low power levels, causing haze and lazy low-horsepower performance.

Low compression pistons on top of big air flow is the recipe for making *****-to-the-walls power, but if you need to ask about it then I wouldn't recommend it for a daily driver. Especially on a VE engine that's inefficient to begin with.