marine bowl piston

[warhammer92]

whats your guys take on marine bowl pistons vs stock. I want opinions, your knowledge and the pros/cons?
In a performance and daily driver?
I have no comparison since never drove the truck with stock pistons.

[RCCUMMINS89]

I know marine injectors are incredibly more responsive and don't need as much timing.

Therefore Marine pistons would allow one to use the marine injectors without the INCREDIBLY bad hazing and smoking.

[warhammer92]

whats the compression ratio with them. I know its lower than stock. and with the larger bowl and lower compression allows more air correct? If so wouldn't there be substantial amount of hp gain since there would be more fuel being burnt. less haze, fuel economy and throttle response?

[RCCUMMINS89]

Lowering compression won't increase throttle response.......and it'll create more haze.

HOWEVER, I was under the impression that they ran the same compression. But might be wrong on that.

[warhammer92]

I wasn't sure that's why I put the question marks. im just a kid out there to learn. I was always told to lower the compression in diesels to get more power but im open minded and like to hear peoples opinion. the only way I could find out is having an identical truck with stock pistons. which would be impossible cus everyone is different. and around my town my truck is poorly judged

[DodgeFreak]

I don't think you want to lower compression unless you have a lot fuel and have lots of boost.....you'll get poor starting, lots of hazing and if not set up right no more power and lots of money down the tubes for a work truck. And I'm pretty sure the marine pistons are the same comp. as ours. Unless you get them with reliefs.

[warhammer92]

Wouldn't it be only hard starting in cold weather? I can hit 65# of boost. I don't daily drive my truck and its not a work truck. I just got tired of getting on the freeway at 45 and having take a few miles to get up to 70. If I were to build my idi I would spend a fortune just trying to get 300hp and it wouldn't be a fun truck to drive. I built my truck to the way I wanted. But now I'm just trying fine tune everything and to get a better understanding of these engines

[RCCUMMINS89]

If smoke or haze is an issue........the only way changing compression to help that is if you RAISE compression.

However, most will lower compression in competition only scenarios because it lowers peak cylinder pressures at wot. Lowering compression doesn't do anything for driveability. It simply keeps things from blowing up at huge amounts of boost and fuel.

What's your set up again? Do you have a cam? Also, you would probably benefit from a lot more timing (of course I don't know where it's at)

[warhammer92]

300cc flowing pump, m4 fuel pin, 5x16 injectors, 64mm turbo,marine pistons and a 188/208 cam on the way.mild head porting and timing is about 18 deg. Gear ratio is 4.10 with 40" tall tires and have a fully built auto.I just had my converter loosened up to 1800 stall

[RCCUMMINS89]

Cam will help............might want to bump your timing another 3 degrees or so to see if that'll help with the smoke. Also, that m4 pin isn't going to help the smoke issue.

[warhammer92]

It just smokes under a load or if I shift to soon.manual valve body.
But I leave my foot out of it most of the time. Since California is full of cry babies.
Blowing smoke looks cool and all but I could careless about it.when I was in high school it was the coolest thing but it got old seeing my furl gauge go down fast. But seeing I have stacks its gotta smoke a little when I go offroad

[RCCUMMINS89]

I think you'll be really happy once you get that cam in

[warhammer92]

Yeah in pretty excited but my bank account isn't. Good thing I only have 2k miles on my can bushings and bearing.they look brand new