Supernatural 3.7L 9,000RPM Project (Page 15/20)
La fiera MAR 04, 08:09 PM

quote
Originally posted by sanderson231:

Since the goal seems to be to get as much atomization as possible in the big plenum, I was wondering if it would make sense to use single stage high pressure drop (direct injection) injectors .




Sanderson, the problem with that is that to get that hi pressure drop those injectors demand very high pressures. Right now I'm using 55psi on 43.5psi injectors which means I use a smaller injector and via increased rail pressure I can make the lbs/h requirement to get to the size injector the engine needs.
sanderson231 MAR 04, 11:09 PM

quote
Originally posted by La fiera:


Sanderson, the problem with that is that to get that hi pressure drop those injectors demand very high pressures. Right now I'm using 55psi on 43.5psi injectors which means I use a smaller injector and via increased rail pressure I can make the lbs/h requirement to get to the size injector the engine needs.



Yes the direct injection injectors would require a direct injection fuel pump
claude dalpe MAR 07, 04:22 PM
Rei (La Fiera) do you have a deadline to finish this supernatural 3.7L With a cool 9,000RPM red line

I can't wait to see it on the dyno (test bench)

Claude
sanderson231 MAR 07, 05:38 PM

quote
Originally posted by La fiera:


That is why I have the injectors high up in the runners. To give it enough time for the alcohol in E85 to evaporate and do its thing. There is no intercooler that will do a better job than that. And you may wonder about transient throttle response. Well, the Megasquirt has an algorithm to compensate for that. So now due to software technology I can have injectors farther away and be able to program them to make up for the difference of transient throttle response.



I did some flash calculations with E85 and the temperature is substantial if there is enough time for it to vaporize. The temperature drop across the plenum would be an indication of the extent of vaporization

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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged

La fiera MAR 07, 09:23 PM

quote
Originally posted by claude dalpe:

Rei (La Fiera) do you have a deadline to finish this supernatural 3.7L With a cool 9,000RPM red line

I can't wait to see it on the dyno (test bench)

Claude



The goal is to have it broken in and tuned on an engine dyno but I've called lots of places here and no one is willing to but a V6 on their dyno. I have another Megasquirt, water pump intake and injectors ready to just put on the dyno an let her rip. But The shops around here if you don't have an LS or a SBC or SBF with a carburator they don't want to do it. So, I just gave up on that idea. I'll put the short block together this week and just leave it there until the currently 3.7L on the car has given me the last ounce of HP and torque an I'm done testing and enjoy it on some track days this year. So I guess by the end of the year I'll pull out the short rod 3.7L and the long rod will go in for a year of testing. I have another engine on the works that the only thing I'm waiting is the piston set.
lou_dias MAR 07, 10:00 PM
That makes no sense...unless they are thinking THEY are doing the tuning.

I find a lot of these professional tuners are 1 trick ponies. I have shops around me that only tune Mustangs, and others that only tune F-bodies.

You just got to tell them you just want dyno-time...not their tuning abilities.
fieroguru MAR 08, 06:49 AM

quote
Originally posted by La fiera:
But The shops around here if you don't have an LS or a SBC or SBF with a carburator they don't want to do it.




quote
Originally posted by lou_dias:

That makes no sense...unless they are thinking THEY are doing the tuning.

I find a lot of these professional tuners are 1 trick ponies. I have shops around me that only tune Mustangs, and others that only tune F-bodies.

You just got to tell them you just want dyno-time...not their tuning abilities.



I suspect the issue is they don't have the proper engine mount setup, bellhousing flange or the crankshaft coupler to mount the 60 degree V6 onto their dyno. All could be purchased, but that likely far exceeds the revenue they would get ffrom a dyno run or two. You are probably the only one looking to dyno that particular engine, so there isn't enough demand to justify the investment.
La fiera MAR 08, 07:52 AM

quote
Originally posted by fieroguru:


I suspect the issue is they don't have the proper engine mount setup, bellhousing flange or the crankshaft coupler to mount the 60 degree V6 onto their dyno. All could be purchased, but that likely far exceeds the revenue they would get ffrom a dyno run or two. You are probably the only one looking to dyno that particular engine, so there isn't enough demand to justify the investment.



You are absolutely right Guru! I do have a Mustang dyno ten minutes from me, the same dyno I've been using for the past 12-14 years. The reason I want to bench test, tune and dyno is because I need research and data collected and use that info on my new endeavor. If I do find someone willing to work I would not mind getting what they need as far as to put my engines on their dyno. I even was looking into getting my own engine dyno. I'm pretty sure I can find something affordable maybe used. It's about $750 to 1200 to run on an engine dyno depending on the complexity of the dyno installation and tuning.
claude dalpe MAR 08, 09:46 AM
Alright Rei, I'll wait patiently and continue to follow your progress.
lou_dias MAR 08, 10:08 AM
Ah, I had assumed you would have it in the car already...