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View Full Version : motron 60lb injectors?


shorti28
10-30-2005, 09:38 PM
how much hp can these injectors support? and are they 60 lbs or 65lbs. What turbo will make that kind of power and run 3,500 stahl or should i do 4000 stahl. I'm looking for high 9s to low 10s. Ive seen the recipe pages but I want to know who's running what turbo with good success. and aren't there some new turbos that don't require high stahls for big power.

kenmosher
10-30-2005, 11:03 PM
They are "MotoTron" injectors (now Edge injectors ... Edge Products has partnered with MotoTron to make more flow rates with similar design for the high performance aftermarket and Edge handles the injector line).

They are rated at 60#s per hour at 43.5 psi and 80% duty cycle. They are extremely linear precision pieces that easily support increased differential pressure for even more flow (at 5 BAR they flow almost 83#s per hour).

I've presonally used them on a couple of 900-1000 HP V8s (supercharged) and my Turbo Regal to the tune of 650+ HP with 50 psi rail pressure. They were originally developed for Mercury Racing's 1150 HP twin screwcharger boat motor.

shorti28
10-31-2005, 11:38 AM
thank you.

Ormand
10-31-2005, 09:11 PM
how much hp can these injectors support They will EASILY support 1200 horsepower- in a 12 cylinder engine! In a turbo Buick, 600 would more reasonable. Scott must be running pretty lean to get to 650+ with them.

kenmosher
11-03-2005, 09:07 PM
Ken ... is not running lean .. :D

9:1 at the top end (need to turn down the DC on them). 54 psi rail pressure with dual pumps.

The cool thing is that they follow the typical pressure curve formula and will flow up to 83.5 psi at 5 BAR with no problems. We have some crazy Haybusa guys running them at 100 psi base pressure (though we don't recommend it) with no problems and some insane tire shredding horsepower (550 rwhp).

Ormand
11-18-2005, 05:18 PM
KEN- not scott..How do you get that much power per pound of fuel? Sometimes a naturally aspirated engine, with high compression,will get 1/2 lb per horsepower-hour, but most of the folks I've seen who had numbers for turbo engines run rich enough so that they are more like 0.60 to 0.65 lbs per horsepower-hour. That was the basis for my guess that you were running lean. at 0.60, that would be 100 horsepower per injector. You are running a little less than 0.60, which sounds reasonable to me, but it is better than the claims I've been reading over these past years. And if you're running 9 to 1, that would seem to make you LESS fuel efficient, not MORE??? I would think that to be that efficient, you would be nearer to 12 to 1 A/F.

kenmosher
11-18-2005, 05:28 PM
Target was 11.8:1, but we only maintained that until 21 psi or so. Then I basically overrode it with the VE Map and went to really rich for safety (these were engine dyno sweeps, so they happen very quickly).

The 9:1 was where we ended up after 21 psi and about 5200 RPM ... killed the power/torque too. Peak was at about 4900 RPM for HP and fell off as it got too rich. Really interesting process. As we zero'ed in on things, I thnk we could probably have gotten a little more RPM range and power by trimming the top numbers.

Unfortunately, I popped a lockwire and caused a leaking head gasket to end our fun (it probably happened very early in the day when we discovered that one pump wasn't enough and ran EXTREMELY lean a couple times.).

It was really interesting to see how max power and AFR were related. You could get a pretty dramatic swing in output with just a couple points of AFR (if you were on the edge of Rich or Lean). There was definitely a "sweet spot" where you could drift a few points and it didn't make much difference. You hit the edge though and things changed quickly!

I've taken it apart and no damage, so milled out the receiver grooves and put it back together with Cometics.

Some calcs:
Power: 650 horespower
Number of injectors: 6
BSFC: 0.55
Duty cycle: 0.85
736 cc/min injector (70.1 lbs/hour)

The "60s" are basically running closer to 65 lb/hr (mine flowed at about 64). Using the flow equations, they are right at 72.42 lb/hr @ 54 psi, so that's pretty close to both our guesses.