engine horsepower help
09-20-2007, 03:55 PM
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Car: 1986 caged out firebird
Engine: 454 = wheelies
Transmission: th400 stall and trans brake
Axle/Gears: 4:11 ford 9" with ladder bars
engine horsepower help
ok i am building a 454 stroker i would just like the estimated hp and tq of the engine here are the specs the ingine is bored .060 over and the pistons are kb 25.5 dome pistons with a compression ratio of 12.1 to 1 the heads are a ported ovel port head ad the cam is a .560 / .573 lift and 240 int./246 exh. at .050 and a 112 Lobe Separation plus i have 1.8 roller rockers the intake is a weind intake good from 1500 rpm to 6500 rpm so it matches the cam also have hooker long tube headers
09-20-2007, 11:32 PM
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Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Which oval port heads?
Are you sure about that compression ratio? What did you intend to burn for fuel?
Are you sure about that compression ratio? What did you intend to burn for fuel?
09-21-2007, 12:02 PM
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Car: 1986 caged out firebird
Engine: 454 = wheelies
Transmission: th400 stall and trans brake
Axle/Gears: 4:11 ford 9" with ladder bars
Re: engine horsepower help
i am sure about the compression ratio and i will be running 104 octain and the number on the heads read 336781
09-28-2007, 11:49 PM
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Car: 1986 caged out firebird
Engine: 454 = wheelies
Transmission: th400 stall and trans brake
Axle/Gears: 4:11 ford 9" with ladder bars
Re: engine horsepower help
anyone have an idea
09-30-2007, 07:48 AM
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Car: A Portly 85 Z28
Engine: 4.530 X 4.250 BBC
Transmission: under rated for this application
Axle/Gears: also under rated
Re: engine horsepower help
Well here`s what my calculations come up with...I`m assuming by stroking you mean a 1/4 stroke...
cylinder bore size 4.310
piston stroke length 4.250
head gasket bore 4.375
gasket thickness .039
combustion chamber cc 119.
piston dome CC 25.5
piston / deck clearance .016
calculated engine compression 10.502183258123432:1
total displacement volume 106.93282925581089 CC
to get a true 12:1 you will need a 40cc dome. So with a 496 cubic inch with a pump gas friendly 10.5 to 1 and a small hyd flat tappet, 1 7/8 headers, dual plane intake and oval port heads you will have quite the torque monster, I would guess it to have around 575-600 ft lbs of torque and probably 500 HP or so at a lower rpm say somewhere around 3500-4000, that is one hell of a pump gas STREET motor!
cylinder bore size 4.310
piston stroke length 4.250
head gasket bore 4.375
gasket thickness .039
combustion chamber cc 119.
piston dome CC 25.5
piston / deck clearance .016
calculated engine compression 10.502183258123432:1
total displacement volume 106.93282925581089 CC
to get a true 12:1 you will need a 40cc dome. So with a 496 cubic inch with a pump gas friendly 10.5 to 1 and a small hyd flat tappet, 1 7/8 headers, dual plane intake and oval port heads you will have quite the torque monster, I would guess it to have around 575-600 ft lbs of torque and probably 500 HP or so at a lower rpm say somewhere around 3500-4000, that is one hell of a pump gas STREET motor!
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