Common Rail Injector Body Maximum Flow?

[Brayden]

Volker what are your thoughts about the stock injector body.. At what point does the injector body itself become the restriction instead of the nozzle?

I had a conversation with a Super Stock Tractor puller builder a while back and he said that common rail will never make it into tractor pulling because the injectors couldn't flow enough volume.

I think that's BS.. What's your take? Can a CR injector flow enough fuel for 2500hp?

Brayden

 

[mytmousemalibu]

Good thread, i've been intrested in this aswell! You want the holes in the nozzle to be the smallest restriction but i tore into a crapped LB7 injector once. Not real sure of what all i saw but i can definatly see room for improvment inside, wonder is some extrudehoning could do some massaging in there!

 

[malibu795]

knowing the inj lines is roughly 3/16-1/4" ID

stock LB7 holes are .0066" with 7 holes. is .145068sq in tottal area for 7 holes

the biggest i have heard is 80% over (180%) of .0066" = .01188" that is if you kept the same 7 holes

.01188*3.14=.0373032 sq inches per hole. * 7 holes .2611224 insq tottal area of the holes combined. little over a 1/4insq woth of area


if the inj body can would be next restriction, then lines then cp3(s)

.25" ID line has .785insq of area
.1875 ID line has .58875insq

 

[Brayden]

Injection line ID is 2mm ID IIRC and 8mm OD. It's a standard size line from what I can remember. I'll be at the shop in a few hours. I'll look at them.

Working on my birthday.. I swear I need a hobby!

 

[Brayden]

Yeah it's either 2mm ID or 3MM ID. That's about as large of a fuel injection line I can find. If it's 3MM line (.120") that is roughly .371 square inches of area. I think they're 2mm though..

Brayden

 

[mde]

The next restriction you got (beside the holes) on the injector is the bar filter in the inlet nipple of the injector. There is just 0.02 mm clearance (0.00787") which filters the particle of the CR-pump.

I just quick calculated how much holes in the nozzle we need to get the 2.5kHP ==> 20 x 0.205 mm diameter which is pretty wild, and I think the injector nozzle would not support that much flow (breaking the cap of the nozzle) but the injector himself I think it would support the high flow.

Also you would need 5 CP3's (13 l/min) or a high flow pump like this L'Orange pump which flows 13l/min and is 120 lbs .... I will see whether I get some pics here, the website is down from them ....

 

[Brayden]

What about a nozzle with 7 @ .030" what would those flow? I've personally seen a set of nozzles this size.. They had to atomize like crap.. But injectors are like carburetors to the 12v cummins guys... you never can get to big... :screwy:

 

[malibu795]

thats funny Brayden......bigger carb mean more power... true to a point :rofl:


happy bday

 

[mde]

What about a nozzle with 7 @ .030" what would those flow? I've personally seen a set of nozzles this size.. They had to atomize like crap.. But injectors are like carburetors to the 12v cummins guys... you never can get to big... :screwy:

520% but no atomization and smokes like crap :screwy:

compare stock / 0.030

sorry, problem with my server

http://picasaweb.google.com/vsc.mde/Tech/photo?authkey=quFNuskGrPc#5204705853343648674

http://picasaweb.google.com/vsc.mde/Tech/photo?authkey=quFNuskGrPc#5204705866228550578

 

[mde]

 

[Brayden]

Thanks!

thats funny Brayden......bigger carb mean more power... true to a point :rofl:


happy bday

 

[Brayden]

Could the nozzle be custom made from a material that could withstand the 20 @ .205 mm configuration you were talking about earlier?

 

[mde]

Could the nozzle be custom made from a material that could withstand the 20 @ .205 mm configuration you were talking about earlier?

You are running 400% over injectors, in the moment it makes no sense to talk about this, our pistons crack over 800HP, cylinder heads don't flow this amount of air .... The fuel supply is the easiest part of all ...

Happy B-day Brayden

 

[Brayden]

I'm not trying to use this on the Dmax.. More like a 650 cubic inch tractor engine.

Was wondering if it was possible to fuel enough through a CR injector to support a pro-stock tractor.

Thanks,

Brayden

 

[mde]

Here a pump with a flow of 20l/min which covers 3MW ~ 4000 HP, do you it's enough?

I think medium duty injectors are not big enough to supply this amount of fuel in this short time, here some injectors I worked and did some R&D work for it:

 

[Brayden]

1000mm3 should be good for 2000hp though wouldn't you think?

 

[Bentley]

1000mm3 out of one injector, WOW!!!

Thanks for all the good information Volker!

 

[duramaximizer]

What voltage do those fire on? Any chance of getting a custom OS? How would you run 6 via EFI Live. I haven't seen a tractor with a V8 diesel yet. hmmmm.

 

[mde]

What voltage do those fire on? Any chance of getting a custom OS? How would you run 6 via EFI Live. I haven't seen a tractor with a V8 diesel yet. hmmmm.

Firing with 48V / 20 Apmps boost current / 10 Amps holding current. Using my stand alone ECU controller and SW

 

[duramaximizer]

That darn picture doesn't enlarge, I don't know what the deal is?

Sweet. :cool2: