[charlie66]

Does anybody know how much power a .150 needle and seat can support with e85 under 25 pounds of boost?

[johnta1]

For the life of me, I can't find the calculator.
I thought I had one somewhere on my computer at least.


Anyway, I think it can support around 800 HP.
The problem is probably keeping the bowl full while under "G's"
(also 25 lbs is like blower boost?)

I think from just the area of the needle it is like roughly 3 ounces of fuel a second on a good pump.
(probably less than 2 ounces with regular needle/seat)

[Tom Vaught]

Originally Posted by johnta1

For the life of me, I can't find the calculator.
I thought I had one somewhere on my computer at least.


Anyway, I think it can support around 800 HP.
The problem is probably keeping the bowl full while under "G's"
(also 25 lbs is like blower boost?)

I think from just the area of the needle it is like roughly 3 ounces of fuel a second on a good pump.
(probably less than 2 ounces with regular needle/seat)

"(also 25 lbs is like blower boost?)"

No, (more like Turbonetics HP-76 Turbo Boost).

Charlie has been there many times with his 4 cylinder engine. (just wants to go 30+ psi now). LOL!

Tom Vaught

[charlie66]

Originally Posted by johnta1

For the life of me, I can't find the calculator.
I thought I had one somewhere on my computer at least.


Anyway, I think it can support around 800 HP.
The problem is probably keeping the bowl full while under "G's"
(also 25 lbs is like blower boost?)

I think from just the area of the needle it is like roughly 3 ounces of fuel a second on a good pump.
(probably less than 2 ounces with regular needle/seat)

Lol! Its always when you want something that its never there.

I don't know what the motor is making, but it goes lean around half way through second gear. Im thinking of trying dual needle and seats just to see..

[charlie66]

Originally Posted by Tom Vaught

"(also 25 lbs is like blower boost?)"

No, (more like Turbonetics HP-76 Turbo Boost).

Charlie has been there many times with his 4 cylinder engine. (just wants to go 30+ psi now). LOL!

Tom Vaught

Ive really been thinking about getting fuel injection at this point. Im tired of chasing the rabbit... I find myself talking to my engine sounding like Elmer fudd scraching my head wondering where all the fuel is going. Lol... Because I know the pro-tuner 750 is more then enough for what im doing here.....

[johnta1]

What carb are you running?

[charlie66]

Its a carb that I built from scratch. I bought the parts fro BLP. http://www.blp.com/

Its a 800 4150 with all the stuff needed to do what im trying to do.

I'll be putting dual needle and seats on next and if that doesn't do it I think im going efi.

I tried contacting Big stuff 3 with no luck as well as mega squirt . So the only company that answers its phone has been Fast , so I may be going in that direction. There is one other company I want to look into as well. Pro EFI. But im at the end of trying to make this carburetor work at this point. It worked real good up to 15 to 18 psi. I just cant get enough fuel to it...

[Torment]

I've read the .150's will flow 4-500lbs/hr at standard carb operating pressures. So figuring .75BSFC that'd give you about 650hp per on paper - give or take...

Work with the FAST stuff at work... it's worked as advertised in that application.

[johnta1]

So figuring .75BSFC

You probably mean .45?
Or did you mean sp.gr. of E85?

That 4-500 could be a good number for the lb/hr.

I believe the .120 valve was about 300 lb/hr as flowed by Holley.

[Torment]

No I meant .75 BSFC. That'd be pretty safe for boosted E85 - gas being .4-.5ish.

[johnta1]

Never really thought of it using 'BSFC'.

But if using that nomenclature, I'd say for a boosted application, that would be pretty lean?
(.75 BSFC using E85)

That may be good for N/A application.
(E85 is 85% alcohol or 85% of 1 is .85)

With methanol, N/A would be .9/1.0 BSFC, and boosted would be 1.8/2.0 BSFC.

Anyhoo, make sure the float bowls stay full, especially under launch conditions with all the G's making it harder to keep full.

[Torment]

About .85 peak torque, .7 peak hp didn't hurt any parts up to 20lbs with E85 carb fed - draw through not blow through. These carbs were built for the app. by Pro Systems, the SV1 style. I had two of them - 4 bowls - and I ran a boost referenced regulator to up the pressure to 10-11psi under load. Gdlk!

[johnta1]

Yep, 2 carbs I would think would be needed.

[charlie66]

when you say .75 do you mean the lambda reading??

[Torment]

No. Brake Specific Fuel Consumption. It's a measure of fuel burned to power produced you'll typically get from an engine dyno session - at least if they have a fuel turbine installed and calibrated.

My boosted non-intercooled ethanol engine I run in the mid .6's lambda - well on the rich side of what you'll read searching around as optimum by most. The thing about ethanol is the wide range between the lower explosive limit (LEL) and upper explosive limit (UEL) - basically the percentage of available atmosphere it is combustible within. Ethanol will burn from 3-19% versus gas only 1.4-7.6%- so I read my plugs, keep a hot plug (NGK 7's) in it, and keep plenty of fuel in it. I get good performance and don't hurt parts this way. Leaning it out can pickup power, but it gets easier to take the intake pocket out of your pistons... On the flip side ethanol has a high flashpoint as compared to gas - >= 55deg F I believe. That's why the gas is blended in to help light it off.

Fueling, timing, chamber, cam profile, compression, boost, intake air temp... etc... etc... all will make each combination respond a little different. Gotta read your plugs and go from there.