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Re: Do blown motors need more fuel pressure?
[Re: Ramrod39]
#1480859
08/07/13 02:55 AM
08/07/13 02:55 AM
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Joined: Aug 2003
Posts: 43,223 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,223
Bend,OR USA
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Quote:
A buddy of mine is putting a blown big block together. He is figuring out his fuel system. Is 7 psi a good fuel pressure for a blown motor? That is what I've always heard is about right for normally aspirated motors.
Pressure is not the thing to concentrate on, you want enough volume to feed the motor to make sure it has more than enough fuel for the intended HP it has Fuel can aireiate(SP?), get air bubbles into the fuel stream, making pressure but not enough volume Is he going to suck through the carbs or blow through them? How many and how big of carbs. and which type and size blower? He will need a big enough fuel line pickup in the fuel tank, big enough fuel filters and fuel line to feed the motor, big enough fuel pump and regulator and big enough needles and seats to keep the fuel bowls full enough to not starve the motor at wide open throttle Lots of gremlins out there , and then you need enough ignition to fire the sparks plugs under pressure I have thought of making a blown pump gas BB wedge motor(Indy 440-1 CNC ported, 500 C.I.) that would have right at 9.0 to 9.25 to 1 comp ratio and use a 10.71 blower and under drive it so it would have between 3 to 5 lbs pressure at 6000 RPM, two big carbs and get after it, that would probally need a aftermarket block to be safe though
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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