how many gallons?

What is the best way to determine how many gallons of fuel to give a blown engine? I have a 1710ci 12 cyl allison and just curious the best or a good way to figure it out. I am jumping in to this blind and have went "to me" super rich and super lean and got little change. The system is an mix of hillborn and enderly stuff. The manifold is hillborn, the nozzles are enderly and a K barel valve with a hillborn pump. blower makes 26lbs at our rpm range. Any info would be great. Thanks Branndon Scott.

 

a WWII p-47 or p-51 mechcanic would probly know ( lol ) im sure there is a formula just jokin around

 

Mike C says 9.5 gallons for 30psi boost at 300ft DA


At first I thought it was a typo 1710ci LOL

 

Wayne Longnecker (515) 367-4184 could speak intelligently to fueling an allison.

He has built many allisons for his own pulling tractors and others, including Europe customers. Some of his combinations that I know of; 2 turbos feeding into the allison centrifigual charger, 2 turbos, centrifigual charger and last an allison with 2 roots blowers. Oh, he also had an allison that he cut in half to make a 6 cylinder.

His stuff runs.

 

I just reread your post, sounds like you are using the original blower and is that the slower blower speed.

At least on the turboed allisons, Hilborn's "pinch valve", where increased boost psi returns less fuel to the tank, are commonly seen.

Have the heads been ported?
Seems to me the more stock headed allisons running the fast blower speed were making about 40 psi.

Bollinger's in Illinois don't run turbos and probably could also help. (217) 325-3281 I don't know them, this appears to be there Trucking bus. phone #

Allison trivia: 4 valves per cylinder, 2 overhead cams, 5.5" bore x 6.0" stroke, 2 spark plugs/cyl, no head gaskets and the con rods are a fork and knife design (the cylinders are straight across from each other)

If you draw us how your system is plumbed we could diagnose it better.

 

Thanks for all the info guys.

Sodak, we have a run a pinch valve aka sensor valve on this already. Also I am "told" by the owner that this is the high speed compressor running at 9.6:1od. I'm not sure on the heads being ported or not? Thanks for the contact info I will make some calls on Monday.

Mike, No on the egts or flow meter. It has no data logger at all the only thing I have is a tattle tale fuel pressure gauge and a pyrometer on 1 cyl on left and right which I have to depend on the driver to remember to look at durring the pull As far as the rich or lean when I started on this it had been tuned by a reputable tuner here in Bakersfield and he didn't run a main at all. When I started it wouldn't rev over 2,000 and I took a shot in the dark and threw a .130 in it and the rpms came up nice. It only revs to about 4,200 on the high side from what I gather. So that is where I got the rich or lean I should have said I threw a lot more fuel at it, not rich or lean. With my shot in the dark it turned about 2200-2400 with a sled hooked up and made it to 200' where it wouldn't go above 1800 on the last 5 or 6 outings and would barely make it to 100'. So I know I went the right direction but Just wanted some input from you guys.

Another question, this thing has an intake box over the manifold how much will the cubic inches of that box affect the total boost #?