Marine P7100,355HP @3000 RPM pumps

[moparguy]

Made a trip to the classifieds and noticed an ad for marine P7100s. Anyone know how these work on our engines.



I'd guess that the 355 hp would be flywheel, and that the engines they're for would differ somewhat from ours, prehaps lower compression, of course 370hp or so marine injectors, basically no exhaust system to deal with, ect.



In thinking about how this pump would work for us, my first thoughts are that we would not see the hp numbers the marine guys do.



So, would one of these be a worthwhile upgrade for us? Better than the 215 pump?

 

[HoleshotHolset]

Make sure the one you buy isn't from a counter-rotating engine... . if a boat has twin engines... 99. 95% of the time one of them is standard rotation and the other is counter-rotating. So if you installed a counter-rotating engine in your truck... it will go like hell in reverse, but no so well in the proper direction... ...



This theory applies to gasser marine engines... . as that is what I have most experience with.

Again, I'm not even sure if this applies to the injection pump... . but it might... . Buyer beware!!



Matt

 

[The patriot]

Originally posted by HoleshotHolset

So if you installed a counter-rotating engine in your truck... it will go like hell in reverse, but no so well in the proper direction... ...

Matt

I may be wrong here, but the oil pump would probibally be turning backwards too, so it wouldnt go like hell for long.

Eric

 

[Cummins Corvette]

I asked Piers that question and he said no, the 215 pump is the ideal pump. I don't really understand why though. The bigger the plungers and cam, the more fuel the thing can move. I remember him saying that the marine pump isn't ideal for a truck application because it lacks features like the afc or something. The 300 hp rv engine pump should be the ideal pump then. In should have just as much advance and be able to move a lot more fuel than the 913 can. I have always been really curious about this. I hope the pros show up and explain everything.

 

[HoleshotHolset]

patriot,



hilarious stuff!!



Matt

 

[Joe G.]

The thing to remember about marine stuff is that the application requirements are so different. Full throttle operation for hours or days is common. Excelleration is not common so things like turbo lag are not a consideration.

 

[Hutchew]

just .02 worth of not much.......

I would imagine there may be a problem with overheating, since a marine engine has what could be considered an infinite source of coolant, whereas we are stuck with what we can stuff into 4 cores. Maybe?

 

[Joe G.]

James,



It's not quite that simple. It's true that there is an infinite source of cooling flow of ocean water, but our trucks also have an infinite flow of air. Marine engines operating in salt water do not pump the water thru the engine block like they did fifty years ago. They have cooling systems with coolant and thermostats. Most either use a heat exchanger mounted somewhat like a radiator that has outside water pumped thru it instead of air or a system of tubes attached to the bottom of the boat called a keel cooler. In neither case is salt water pumped thru the engine. I've had heating problems with marine engines, usually during really rough weather so it's a lot of fun to deal with. A stuck stat or anything else that causes a overheating problem is the same on land or sea.