Anything new with the p-pump conversion injectors?

[Smokem]

Originally Posted by shiftycapone

I just had my mach 6's pop tested and they came out at 260bar. Funny since they came to me from Don that way, for my truck when it was a vp. Eric at browns told me he thinks they are lowered to help the vp live.

I've seen them from 240-290BAR, it has nothing to do with helping the VP44 live.

[shiftycapone]

Originally Posted by Smokem

I've seen them from 240-290BAR, it has nothing to do with helping the VP44 live.

Please elaborate on what the reason for lowering the pressure is in a vp injector to the point where it gets into p-pump opening pressures?

[RonA]

I think Don has specified 305 Bar as where vp injectors are set. The pressures fall with time. I'm not sure where my 7's started, but after a little less than a year they were at 260. I checked them recently and they are down to 245. I have been seeing more smoke at idle and slight throttle too. I don't know if the two are related, but they do seem to be.

[shiftycapone]

Originally Posted by RonA

I think Don has specified 305 Bar as where vp injectors are set. The pressures fall with time. I'm not sure where my 7's started, but after a little less than a year they were at 260. I checked them recently and they are down to 245. I have been seeing more smoke at idle and slight throttle too. I don't know if the two are related, but they do seem to be.

My machs have maybe 10k on them, so I guess it could just be a normal "wearing" of the spring.

[Smokem]

You will not see a drop of 40BAR with "normal" wear.

[shiftycapone]

Originally Posted by Smokem

You will not see a drop of 40BAR with "normal" wear.

I didn't think I should, but after hearing Ron have some similar results it made me think. I don't feel that I put anymore wear on injectors than any other person. Manufacturing issues?

[RonA]

Originally Posted by shiftycapone

I didn't think I should, but after hearing Ron have some similar results it made me think. I don't feel that I put anymore wear on injectors than any other person. Manufacturing issues?

Mine didn't start out any where near 305bar. Probably around 4000psi if i was to guess. There is always the possibility that the gauges are different. I have thought about checking my tester against a couple others to see how the readings compare.

[dieseljunkie]

I ran my inj @ 280 bar in my VP set-up and was told to leave them alone for my new P-pump set-up. (sled pull only).

[985cumminslover]

im planning on going with a scheid 13mm ppump soon ima keep my mach 7s there was a truck with mach 7s with 24v pop pres that had a columbus built 12mm pump that made 800hp on fuel with i believe 62 over 88 twins turbos

[Smokem]

I've seen many 24v injectors, from a few different companies have opening pressures all over the place, and often quite a bit too low.

[dieseljunkie]

Originally Posted by Smokem

I've seen many 24v injectors, from a few different companies have opening pressures all over the place, and often quite a bit too low.

It was explained to me that lowering the pop pres to much on VP inj will lose the desired atomization of fuel, however the higher (than a 12v) opening pres will shorten the duration of the injection event. So other than a conversion injector we are stuck with what we have, but is it nessicary in a competition application only? What other options are there?

[Smokem]

Originally Posted by shiftycapone

Please elaborate on what the reason for lowering the pressure is in a vp injector to the point where it gets into p-pump opening pressures?

Price the shims for a stepped nozzle holder. So much easier to just put nozzles on and send them out the door.

[RonA]

Originally Posted by Smokem

Price the shims for a stepped nozzle holder. So much easier to just put nozzles on and send them out the door.

I set the lathe up to machine shims first. Then test them all and figure out what size shim they are going to need. Then make a shim, assemble and test the injector till it's where I want and then move on to the next. I don't blame some places for cutting corners. I wouldn't want to do it for money, but i don't mind taking the time to keep mine where they need to be.

Ron

[RCP Diesel]

I've seen quite a few interesting things.... using zinc washers as shims, and still having them set between 240 and 280 in the same set of injectors.

[SHughes]

Originally Posted by 985cumminslover

im planning on going with a scheid 13mm ppump soon ima keep my mach 7s there was a truck with mach 7s with 24v pop pres that had a columbus built 12mm pump that made 800hp on fuel with i believe 62 over 88 twins turbos

That sounds familiar...

Personally I would LOVE some injectors built just for the application (tighter spray angle too), however I, like most just don't have the funds to get any (especially when talking about a new product). So for now my standard, probably worn out Mach 7's will have to do. Unless I could sell a kidney for some new sticks.

[shiftycapone]

Originally Posted by SHughes

That sounds familiar...

Personally I would LOVE some injectors built just for the application (tighter spray angle too), however I, like most just don't have the funds to get any (especially when talking about a new product). So for now my standard, probably worn out Mach 7's will have to do. Unless I could sell a kidney for some new sticks.

You ran a 13mm? I had always thought it was a 12mm?

Scott what size is your primary's compressor? Think you said 83-85 one time not positive and can't find the post.

[SHughes]

I ran a 12mm pump, just a simple 215 built by CDS and the primary is an 85

[bsmith]

You guys are making me think I need to check my pressures. Its been a lil smokey under light acceleration, more than usual.

What's a good psi for a p pump conversion?

[Stangpwr71]

Originally Posted by bsmith

You guys are making me think I need to check my pressures. Its been a lil smokey under light acceleration, more than usual.

What's a good psi for a p pump conversion?

4000-4200 psi

[RCP Diesel]

Originally Posted by Stangpwr71

4000-4200 psi

why do you say this?