Originally posted by Scott Liggett
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The Silver Buick's 1969 Firebird OHC six project.
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Originally posted by Monk View PostProgress.....need some video of motor runningEscaped on a technicality.
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Manifold Modification
Originally posted by TheSilverBuick View PostI can't bring myself to drill injector bungs into the stock 4bbl manifold.
Of course, you can also drill into a Clifford aluminum one, or make a spacer plate from 1" flat which has the singular function of adapting the injectors. There are no dedicated bolt holes for the intake manifold (they are all shared with the exhaust) so you might need to be creative in your mounting scheme. You're already drilling and tapping into your head, so another 4 to 6 holes shouldn't be such a big deal.
It might be a good exercise, anyway, since you'll have to mock up a new water neck. Even the 1969 configuration - which does away with the bypass adapter - might still interfere with injectors on the #1 runner.
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I've noticed the issue with the thermostat housing that may require sub-optimal angle of the injector(s). I've thought about moving all the injectors upstream a bit and try and lay them over at a steeper angle, but run into issues running into the carburetor. You may of seen pictures of one mock up I did running a fuel rail with two injector pairs then steel tubing, that way cylinders 1 & 2 could be laid over a bit to clear the thermostat housing, then 3 & 4 more upright to clear the carb, then 5 & 6 like 1 & 2. Definately a sub-optimal lay out though.
One advantage to using the stock manifold would be I'd finally be able to try out a carb for a cheap throttle body Another flipside is I may be able to sell the modified intake to someone else that may want to tackle an EFI OHC project (especially if I have proven it runs and works). I'll put this option back on the plate.
I like the idea of a spacer for the injectors, simply cut the intake portions of the flange out of 1" aluminum, but the mounting I can see being an issue as you state. All the methods I can think of off the top of my head expose the aluminum to high exhaust temperatures. As long as the aluminum doesn't melt (like heads and intake cross overs metallurgy?) expanding the 1" intake flange over the exhaust manifold and notch the aluminum for the exhaust manifold to fit under it and run the bolt through the spacer and into the original hole in the head.Escaped on a technicality.
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after watching a carburetor work and seeing / listening / reading the "injector angle" poo on the info-mercial-net, I've decided that the idea is to get a charge of fuel and air into the cylinder, shut the damn valve, and go BOOOOM.
When I ask about why injectors high up the runner make more horsepower, I get answers, but I can't tell why.
Suddenly I'm reminded of that ratty ass 5.3 powered Fairmont - Parish? DG, what was his name? He used to hang out here a bit. Anyway, my favorite quote "Is it straight?" ... "I don't know, does it really matter that much?"
That car hauled ass for cheap and I don't think it knew or cared that it was a total bastard.Flying south, with a flock of bird dogs.
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^^^^^ What Beags said.
I got a lot more done before I was smart enough to know what was impossible.
Fortune favors the foolish maybe? Or don't let perfect get in the way of done?Last edited by STINEY; December 5, 2012, 04:37 PM.Of all the paths you take in life - make sure a few of them are dirt.
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Originally posted by Beagle View PostThat car hauled ass for cheap and I don't think it knew or cared that it was a total bastard.
But you're probably right, as long as the air and fuel make it into the cylinder together in the right proportions, it's going to run better than average.
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Originally posted by William Wilson View PostIf you're worried about thermal expansion causing the exhaust to leak, because I am, why not use a chunk of iron/steel to make the spacer.
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Originally posted by STINEY View PostI got a lot more done before I was smart enough to know what was impossible.
Fortune favors the foolish maybe? Or don't let perfect get in the way of done?
So carry on, Randal - the whole deal is (in the words of my bro) "The Art of the Possible". That's how retrofit plumbing works.
DanLast edited by DanStokes; December 5, 2012, 05:13 PM.
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Don't worry Beags and Stiney, I do plenty of "bad practice" and "bad engineering" just to try it out (you see my oil tube mod? Complete hackery believe it or not. I don't even know the bit size, been rubbed off, found it in the pile of inherited bits). I just hesitate when I know I can likely sell the intake for almost what I paid for the whole engine =P I only called it sub-optimal, I didn't say I wasn't going to do it I can drill holes and epoxy in injector bungs waaaaaaaay easier than building my own intake, and that appeals to meLast edited by TheSilverBuick; December 5, 2012, 05:49 PM.Escaped on a technicality.
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