Relocating the Injectors
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Joined: Dec 2008
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From: Kinston North Carolina
Relocating the Injectors Just something im kinda doing some R&D on. Just wondering if anyone has thought or actually moved the injectors in the head in between the valvecover rail and the manifold. Before anyone starts saying theres not enough meat there, this i know. The head will have to have some aluminum built up on top of the runners in side the valve covers. The 2main reasons for doing this is #1. being able to revise injector aim directly to the base of the valve since atomization is key to a fast flamefront travel, and #2. is being able to get the pinch area opened up on the mainifold. Yes you will actually have to cut the outter part of the runner and injector boss area of the manifold off and fab up the tops of the runner. But you know as well as i do a head is only as good as the intake on top of it. I know there are a katrillion sub 9 sec LT1s out there with stock manifolds that have been fixed by the right person to perform well. But i really think the main advantage will be revising the injector angle. Just trying to see if this has been done before. I know i cant be the first to have thought of it. Any thoughts and ideas are apprieciated.
Just something im kinda doing some R&D on. Just wondering if anyone has thought or actually moved the injectors in the head in between the valvecover rail and the manifold. Before anyone starts saying theres not enough meat there, this i know. The head will have to have some aluminum built up on top of the runners in side the valve covers. The 2main reasons for doing this is #1. being able to revise injector aim directly to the base of the valve since atomization is key to a fast flamefront travel, and #2. is being able to get the pinch area opened up on the mainifold. Yes you will actually have to cut the outter part of the runner and injector boss area of the manifold off and fab up the tops of the runner. But you know as well as i do a head is only as good as the intake on top of it. I know there are a katrillion sub 9 sec LT1s out there with stock manifolds that have been fixed by the right person to perform well. But i really think the main advantage will be revising the injector angle. Just trying to see if this has been done before. I know i cant be the first to have thought of it. Any thoughts and ideas are apprieciated.
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TECH Apprentice
Joined: Dec 2008
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From: Kinston North Carolina
Yea its prolly not worth the extra effort, but its something i thought i would give a whirl. Most people dont realize how crucial good atomization is to extracting every ounce of power out of gasoline. The brake specific fuel consumption would improve. I plan on building a fairly mild stock bottom end LT1 to hang on the engine dyno to do some tuning with. I think i can get a much better tune on the engine dyno with being able to load the engine down however i need to. Especially part throttle tuning and cruising. I will be something new to me. Im use to tuning twin dominator 632 inch big block chevys, so im sure tuning with one of these will be a whole new ball game.
Well that idea has been done years ago long before our LT's. But only pro racers that did want every 1 horsepower. I knew an old man that did circle track racing and they put the injector on the head.. But like SS says, time, effort is not worth it for the power gains, For the cool factor?? Maybe..
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The biggest problem with the LTx intake is the fact that the OEM tried to aim the injector at the intake valve. This forced them to drop down the runner roof to make room for the injector body, thereby increasing runner restriction. GM didn't feel the need to install the injector in the head, even though the emissions and mileage would be most affected rather than power. I'd say the hp gains would be little to nothing. Most people in search of power usually go the other direction and point the injector at the runner floor in order to make room for the runner and optimize air flow, rather than atomization.
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From: Kinston North Carolina
The biggest problem with the LTx intake is the fact that the OEM tried to aim the injector at the intake valve. This forced them to drop down the runner roof to make room for the injector body, thereby increasing runner restriction. GM didn't feel the need to install the injector in the head, even though the emissions and mileage would be most affected rather than power. I'd say the hp gains would be little to nothing. Most people in search of power usually go the other direction and point the injector at the runner floor in order to make room for the runner and optimize air flow, rather than atomization.
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Thread Starter
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Joined: Dec 2008
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From: Kinston North Carolina
Yea i understand your point of view. I mean what good does it do to make a killer intake port that flows 280 or better and then cork it with an intake runner that only flows 220. It will still make more power because the better port will pull more depression on the intake runner. But back to the injector aim. The aim on a stock LT1 manifold is spraying it directly on the floor just before the shortside. Generally that is where the air speed is the greatest. It is possible to have to much airspeed which can cause fuel to drop out of suspension with air, or in this case never fully get into suspension. From my experience with porting these heads or alot of 23 degree SBC heads, its really hard to tame the air speed in that area of the port due to the air having to make such a sudden sharp turn. With that said, pointing the injectors directly towards the valve is only gonna help atomize the fuel, for 2 main reasons, 1 is the air begins most of its swirling at the valve, and #2 its ideal because it keeps the bulk of the fuel off the port walls, which naturally is where airspeed exist and is just another place for fuel to puddle and drop out of suspension. Anytime you atomize the fuel better its grounds for a faster flamefront travel, which negates detonation, and equates to more power with less fuel. So i believe u might be suprised at what the injector aim can do.