Piston Options

[Boostediesel]

What's the price difference between these marine pistons and and aftermarket? Could the marine pistons be cut for valve reliefs safely if needed?

i think the QSB 480HP Marine pistons ran me $168 per piston. i do not know the price of regular pistons.

well if we plan it out right, my 12v block will have that 24v head on it.

Lets just say 03-04 CR marine pistons, just for conversation piece.

what would be needed then? marine spray pattern on the injector tips? I'm guessing you would need new nozzles cut to spec, correct? Would this even work for a vp44 injector?

what you will need are injector tips from and 03-04 CR. hit up Snedge and talk to him, he will be able to find out if you can run a CR pistons in VP engine

 

[SKYNYRD]

well looks like i'll be running a QSB 480 piston in my p-pumped 5.9 cr engine when i build it in a year or two.

 

[Smokem]

What nozzle will be used for a P-pumped application using the '03-04 bowl?

 

[SKYNYRD]

don't know yet that will be down the road for figuring that all out. if i can't find an injector that will work then i guess i'll be figuring out something else. my 6.7 motor build is at the top of the priority list.

 

[Got Twins???]

What nozzle will be used for a P-pumped application using the '03-04 bowl?

Smokem, will a 03-04 CR nozzle fit a VP injector body? If so couldn't one run a converted VP injector for the p-pump with a CR nozzle to work with the CR fuel bowl? What is the difference in spray angle between the VP & 03-04 CR nozzles?

Anyone know how much the VP, CR & CR Marine piston bowls differ in size or rather what each one measure out to?

 

[Smokem]

Yes, no, 153° to 143°. SO VP piston 61mm 305hp CR piston 56mm.

 

[bh10]

well if we plan it out right, my 12v block will have that 24v head on it.

Lets just say 03-04 CR marine pistons, just for conversation piece.

what would be needed then? marine spray pattern on the injector tips? I'm guessing you would need new nozzles cut to spec, correct? Would this even work for a vp44 injector?

Why you wanting to go w/ the 24v head? Probably be easier and cheaper to either do a full port along w/ a new intake manifold or wait for Hamilton's new head.

 

[SKYNYRD]

Yes, no, 153° to 143°. SO VP piston 61mm 305hp CR piston 56mm.

so the vp tip has a 10° wider spray angle and the piston bowl is also 5mm larger. so if a cr tip will fit on a vp injector body. why couldn't you run a cr tip with cr piston and a vp injector body?

 

[Smokem]

This may be an issue.

 

[gus's 03]

lol..... " fits" and " functions" are totaly diferent things.....lol

 

[Got Twins???]

This may be an issue.

Smokem...Ok, help a nobody out here i've never built injectors, disassembled an injector or anything like that so what am I looking at? I can tell they are very different design. I'm assuming VP is on the left and CR on the right?


Also if you can't mod the injector to work what about running a converted VP injector for the p-pump and just open up the fuel bowl on the CR piston?

 

[Smokem]

Your assumption is correct, what you are seeing is the difference between the pintles(needles) of the mechanical and electro nozzle types. They are not interchangeable, the electro nozzle has no need for the pin above the stroke limiting collar.

 

[dieseljunkie]

Why does everybody want a CR nozzle? Why not just get custom VP nozzles made to the spray angle you desire? :what:

 

[Got Twins???]

Your assumption is correct, what you are seeing is the difference between the pintles(needles) of the mechanical and electro nozzle types. They are not interchangeable, the electro nozzle has no need for the pin above the stroke limiting collar.

Got ya and thank you. So how about opening up the bowl on the CR piston to work with the wider spray pattern of the VP injector?

 

[Smokem]

Why use the CR piston at all?

 

[Got Twins???]

Why does everybody want a CR nozzle? Why not just get custom VP nozzles made to the spray angle you desire? :what:

It's not that everyone is set on the CR nozzle it was more of coming up with a combination of parts to make the P-pump, VP injector & CR piston work together. I draw the same comclusion as you, either a custom VP nozzle if possible or open up the bowl on CR piston to work with the wider spray angle is probably going to have to be the answer.

 

[Got Twins???]

Why use the CR piston at all?

Originally the idea of running the CR marine piston was to get a better piston than the VP at a lesser cost than aftermarket. After factoring in custom injectors or machining the bowl on the piston saving money is out the window unless you know someone that can give you a break or you can do it yourself.

 

[Randall12v]

Why you wanting to go w/ the 24v head? Probably be easier and cheaper to either do a full port along w/ a new intake manifold or wait for Hamilton's new head.

that is true. mostly just sparking discussion.

plus Got Twins has the 24v head I will get, or that sweet custom 12v intake!

 

[Randall12v]

Why use the CR piston at all?

no one needs a CR piston, we want the best option for a piston for the given application.

 

[AHall]

And since its being talked about how bout piston options using a 12v head.