Injector Pressure
Injector Pressure
Lead Driver
Joined: Nov 2002
Posts: 9,557
Likes: 44
From: Concord, NC
Are you going to be feeding the engine extra air to go along with this extra fuel? You'd have to calibrate the computer (with a chip) for the bigger injectors, but there wouldn't be any more fuel getting to the engine then, so what is gained? There are other things that would be more beneficial than larger injectors. The stock injectors can handle a little over 300 hp, so unless you have built up the motor a lot, stock injectors are all the flow you need.
Posting Guru
Joined: Dec 1999
Posts: 1,903
Likes: 2
From: Copley, OH
Exactly!
Bigger injectors will not add any HP on a stock engine. Unless you have modified things to the point where the stock injectors cannot keep up, they are a waste of time and money -- and will probably give you drivability problems as well.
Depnding on how hard you want to push theduty cylce and your actual BSFC the stock 19# units are good for at least 245 HP and possibly as much as 285 HP. 300 HP requires a 100% duty cycle, not rweally a good idea.
Bigger injectors will not add any HP on a stock engine. Unless you have modified things to the point where the stock injectors cannot keep up, they are a waste of time and money -- and will probably give you drivability problems as well.
Depnding on how hard you want to push theduty cylce and your actual BSFC the stock 19# units are good for at least 245 HP and possibly as much as 285 HP. 300 HP requires a 100% duty cycle, not rweally a good idea.
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Elder User
Joined: Oct 2003
Posts: 986
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From: Gulf Shores, AL
I plan on building the engine soon it has 300k plus on it. I am going to bump up the compression to about 9-1 put a medium cam in it and so forth. I am not going to drag race it but according to desk top dyno I will be gettin about 290 ponies and about 400 lb-ft of torque
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Posting Guru
Joined: Dec 1999
Posts: 1,903
Likes: 2
From: Copley, OH
400 ft-lbs is a lot with any streetable cam, I'd guess it's virtually impossible with stock heads. 290 HP is reachable, depending on what is included in your "and so forth" but frankly, I'd bet against.
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Elder User
Joined: Oct 2003
Posts: 986
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From: Gulf Shores, AL
Here is the exact numbers and specs. If you have desktop dyno plug this in. The numbers are: (at the flywheel)
Engine RPM Power Torque
2000 135 354
2500 174 365
3000 212 370
3500 247 370
4000 283 371
4500 310 362
5000 329 346
5500 341 325
Not quite 400FtLb but very close
Block: 302
Bore:4.032
Stroke:3.000
Heads:Low performance/Ported, Large valves
Intake Valve:1.94in
Exhaust Valve:1.65in
Compression
:1
induction Flow:700CFM (Not sure on exact CFM)
Manifold Type: Tuned Port (not 100% sure of TPI or Sequential)
Exhaust: Large tube headers open exhaust.
Cam Shaft: Comp Cam XE250H
Lifter: HYD.
Specs @ seat to seat
Int. Lift: .460in
Exh Lift: .474
Engine RPM Power Torque
2000 135 354
2500 174 365
3000 212 370
3500 247 370
4000 283 371
4500 310 362
5000 329 346
5500 341 325
Not quite 400FtLb but very close
Block: 302
Bore:4.032
Stroke:3.000
Heads:Low performance/Ported, Large valves
Intake Valve:1.94in
Exhaust Valve:1.65in
Compression
:1induction Flow:700CFM (Not sure on exact CFM)
Manifold Type: Tuned Port (not 100% sure of TPI or Sequential)
Exhaust: Large tube headers open exhaust.
Cam Shaft: Comp Cam XE250H
Lifter: HYD.
Specs @ seat to seat
Int. Lift: .460in
Exh Lift: .474
Hotshot
Joined: Oct 2002
Posts: 18,488
Likes: 22
From: The Big, Oregon
Actually, throttle body airflow is closer to 600cfm, and assuming you will be running mufflers on this thing, your numbers drop to 356hp and 345lbs/tq. Even at this, you will need to have to reprogram.