Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
Here's a turnkey crate engine for sale from RCS Racing Engines that uses the FIRST fuel injection intake: http://rcsracingengines.com/Perf%20Crat ... 20EFI.html
They claim 460HP @ 5,200 RPM and 520ft lbs @ 4,000 RPM on the engine dyno out of their 383. With those RPM #'s, that's got to be with a smallish cam, too. -Can you imagine building a lower CR version of this thing with a turbo or two? -Use the torque to spin the earth backwards and go back in time, ala Superman 2 and convince GM to just make this thing the original GM TPI intake.
I'm sad that they seem to be the only professional engine builders using this intake. GOOD big block torque #s in a lightweight small block package; an aluminum SBC block would have just ridiculous torque #'s for the weight for a naturally aspirated engine.
Adam
They claim 460HP @ 5,200 RPM and 520ft lbs @ 4,000 RPM on the engine dyno out of their 383. With those RPM #'s, that's got to be with a smallish cam, too. -Can you imagine building a lower CR version of this thing with a turbo or two? -Use the torque to spin the earth backwards and go back in time, ala Superman 2 and convince GM to just make this thing the original GM TPI intake.
I'm sad that they seem to be the only professional engine builders using this intake. GOOD big block torque #s in a lightweight small block package; an aluminum SBC block would have just ridiculous torque #'s for the weight for a naturally aspirated engine.
Adam
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
I would have liked to see the dyno graph. Too bad they did not post it.
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
It never hurts to ask... In my experience, they aren't really into digital communication and prefer olde fashioned phone calls.1989TransAm wrote:I would have liked to see the dyno graph. Too bad they did not post it.
Adam
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
If best atomization of fuel is the objective, use injectors with low flow rates (small orifices) at maximum allowable pressure, for the maximum length of time, usually 85% of normal duty cycle. Use a fuel with a low mean boiling point and high RVP.
For best MPG, run as lean as you can (15-16-1) using a higher specific gravity fuel.
For best mid RPM power, you will have to experiment or simulate intake runner length combinations, to find the sweet spot.
Gasoline is cheap. Go for the power. It's a lot more fun and you can always drive at partial throttle.
For best MPG, run as lean as you can (15-16-1) using a higher specific gravity fuel.
For best mid RPM power, you will have to experiment or simulate intake runner length combinations, to find the sweet spot.
Gasoline is cheap. Go for the power. It's a lot more fun and you can always drive at partial throttle.
Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
EGR is a huge benefit for fuel economy because it cuts down on pumping losses.joe 90 wrote:EGR is more for emissions.
There's plenty of engines made without EGR but maybe not in US of A.
EGR working versus not was the difference between 41mpg (US) and 35mpg in my GA16i engined Sentra.
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
;-(peejay wrote:EGR is a huge benefit for fuel economy because it cuts down on pumping losses.joe 90 wrote:EGR is more for emissions.
There's plenty of engines made without EGR but maybe not in US of A.
EGR working versus not was the difference between 41mpg (US) and 35mpg in my GA16i engined Sentra.
I do really regret buying headers before I fully thought through my combo and goals, but I drive a Vette and not a DeLorean so not much I can do about that now...
Adam
Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
EGR significantly improves light load mileage and reduces NOx emissions, but lean cruise can do just as well or better for economy, albeit at the cost of higher NOx.
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
Indeed. If you're not interested in keeping a cat happy, you can play with lean burn under cruise. OEMs have to keep the cat happy at all times, so they use EGR and nowadays wildly variable cam timing.
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
NewbVetteGuy wrote:;-(peejay wrote:EGR is a huge benefit for fuel economy because it cuts down on pumping losses.joe 90 wrote:EGR is more for emissions.
There's plenty of engines made without EGR but maybe not in US of A.
EGR working versus not was the difference between 41mpg (US) and 35mpg in my GA16i engined Sentra.
I do really regret buying headers before I fully thought through my combo and goals, but I drive a Vette and not a DeLorean so not much I can do about that now...
Adam
Can't you have some bungs welded on?
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
Its possible. big thing is does the intake have provisions for it. Ford had an external EGR set up around the time I LEFT THAT SUPPOSEDLY didnt need to be controlled by the ECM. Did the design work to fit them to a couple engines but never had the chance to learn much about how it worked. Supposedly it worked much better than the earlier version.
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Re: Fuel injectors & fuel pressure for best atomization, MPG and low to mid RPM power?
I'm too vain. I have nice shiny, coated headers and I don't want to ruin the nice coating.englertracing wrote: Can't you have some bungs welded on?
I guess the good news is that I don't have cats so lean burn is a really good option for me.
Adam