I have purchased a set of venom injectors and I can choose any of the following sizes in high impedance:
PART FLOW POWER
HP-619-4, 6, 8 19 lbs/hr up to 245 hp
HP-621-4, 6, 8 21 lbs/hr up to 270 hp
HP-623-4, 6, 8 23 lbs/hr up to 295 hp
HP-624-4, 6, 8 24 lbs/hr up to 310 hp
HP-626-4, 6, 8 26 lbs/hr up to 335 hp
HP-630-4, 6, 8 30 lbs/hr up to 385 hp
HP-632-4, 6, 8 32 lbs/hr up to 410 hp
HP-636-4, 6, 8 36 lbs/hr up to 460 hp
HP-640-4, 6, 8 40 lbs/hr up to 510 hp
HP-644-4, 6, 8 44 lbs/hr up to 565 hp
HP-648-4, 6, 8 48 lbs/hr up to 615 hp
HP-655-4, 6, 8 55 lbs/hr up to 705 hp
HP-660-4, 6, 8 60 lbs/hr up to 770 hp
HP-668-4, 6, 8 68 lbs/hr up to 845 hp
HP-672-4, 6, 8 72 lbs/hr up to 925 hp
HP-678-4, 6, 8 78 lbs/hr up to 1,000 hp
HP-683-4, 6, 8 83 lbs/hr up to 1,065 hp
HP-696-4, 6, 8 96 lbs/hr up to 1,185 hp
HP-108-4, 6, 8 108 lbs/hr up to 1,390 hp
HP-122-4, 6, 8 122 lbs/hr up to 1,550 hp
HP-134-4, 6, 8 134 lbs/hr up to 1,670 hp
HP-148-4, 6, 8 148 lbs/hr up to 1,850 hp
HP-154-4, 6, 8 154 lbs/hr up to 1,975 hp
HP-160-4, 6, 8 160 lbs/hr up to 2,100 hp
HP-168-4, 6, 8 168 lbs/hr up to 2,275 hp
HP-174-4, 6, 8 174 lbs/hr up to 2,350 hp
HP-180-4, 6, 8 180 lbs/hr up to 2,450 hp
These injectors are going to be used on a gen 1 sbc with a intercooled m112 eaton blower. Dart Pro1 ported heads, blower cam, 9:1 comp and accel dfi gen 6. Future mods will be to replace the eaton with a whipple. So I want to pick injectors that will work for now but be able to have the head room for the whipple. I can't decide between the 55 & 60 pounders or would a different size be a better choice. I am asking this question here because you guys have way more experience with these blowers than the rest of the camaro crowd. Please help I want to order these asap.

 

i have read that the spray pattern was better with 60's. and i read that sal had tuning issues with 55's.

that is all second hand info though. do a search here for injectors, there is some info.

 

FWIW, no real answers here


I’ve been doing research on injectors, trying to determine what makes one injector better than another. People talk about one injector having a better spray pattern than another. What makes that so? What is the ideal spray pattern? I haven’t found any information other than “so and so said” XYZ injector has the best spray pattern. While there’s nothing wrong with going with a proven/known quantity, this doesn’t really answer the question of WHY any particular injector is better. And usually “so and so” just happens to sell whichever product he is touting. Let me digress. This is true of all vendors and should be expected. There is nothing whatsoever wrong with it. They are in business to make money by selling us their products. We the consumer should be in the business of making informed decisions.

Here’s what I have found
There are three types of nozzles. I *think* the stock unit uses the pintle style nozzle. I have no idea which type is better.
There are high impedance injectors and low impedance injectors. The Ford computer apparently only supports high impedance injectors. The general consensus seems to be that low impedance will have better idling characteristics than high impedance in higher flowing injectors. Most sites list high impedance injectors up to 50 or 60lbs. Anything larger is typically listed as a low impedance injector.
More and better organized info here: http://www.sdsefi.com/injectors.htm

Moving past all that technical jargon, what makes a higher flow injector worth so much more money than a lower flow one? They have very few moving parts, and those parts all seem to be pretty easily interchanged within the same body. Can the machining costs for a larger nozzle really be that much different that it raises the price that much?

There is obviously a lot to be said for using what has worked for others in the past. I have no problem with that. Right now 50, 55, and 60# injectors seem to all work pretty well in some pretty amazing L’s. Curiously, what seems to be the accepted formula ( http://www.rceng.com/technical.htm ) for sizing injectors suggests that 75# injectors are necessary for 800HP at the crank, if I did the math correctly.

 

I ordered a set of 60's yesterday, thanks for the help

 

wonder if 180's would work in my truck...

 

I believe Sal has the 180s.

 

Concerning injectors are the flow pattern different between 50#55#60# and is a 60#injector need for a built long block heavy modded. Is there such a thing as to much injector. I know our computers can be programed to except any injector but is one better than the other and what brand is our stock injector ????thanks