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Originally Posted by SB
(Post 4220450)
Improper exhaust dimensions can / will add more reversion (intake + exhaust) tendencies esecially when at 'worst length'.
When the energy wave comes back to the valve and it's open...slurp. Serious. :poopoo: |
Originally Posted by SB
(Post 4210917)
Following is just conversation:
Blow thru carb's aren't the most trustworthy thing on the open water. I'm a diehard carb guy, but with blowthru's I personally would go EFI/ Agai, just personal opinion and conversation. Basically I'm waiting for full report of this engine before I listen to what may have happened without evidence. |
Originally Posted by FIXX
(Post 4211294)
Dont rule out your intercooler,,it might have a hole in it and injecting water into the carb..you said hard starting which the engine could have been trying to start on water with the fuel.. pressure test the cooler..
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What was timing at? I didnt see that said anywhere, there are many things that cause this... timing is a huge factor people overlook...and plugs... but you guys got that..
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we have run blow thru carb setups(done properly) and had no issues...
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Originally Posted by Black Baja
(Post 4220490)
Very true. And an easy way to tell if this is happening is look at the intake runners / ports in the head if there is evidence of carbon then the cam, exhaust or cam &exhaust aren't right.
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Originally Posted by the deep
(Post 4221187)
Exactly what I found when tearing down my HP500 . Wonder what was left on the table running the stock Gill exhaust .
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Originally Posted by Black Baja
(Post 4221591)
I would imagine a good bit. When this occurs the cylinder is not getting cleaned out. A good clean mixture can't get into the cylinder and its going to re-burn the already spent charge. There are many factors that can cause this to happen bad valve springs/ valve job, exhaust, cam cylinder head ect ect. This phenomenon really has me wondering how beneficial it would be in a custom build to bolt the exhaust on the head and flow the head same with the intake. Based off those numbers then cam the motor. I think this would give the best package...
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Originally Posted by Black Baja
(Post 4221591)
I would imagine a good bit. When this occurs the cylinder is not getting cleaned out. A good clean mixture can't get into the cylinder and its going to re-burn the already spent charge. There are many factors that can cause this to happen bad valve springs/ valve job, exhaust, cam cylinder head ect ect. This phenomenon really has me wondering how beneficial it would be in a custom build to bolt the exhaust on the head and flow the head same with the intake. Based off those numbers then cam the motor. I think this would give the best package...
One thing that does make sense to flow on an exhaust is the muffler...if it has one.. Edit in: a 'spent' charge cannot reburn. It does, however, occupy space that fresh air/fuel should be occupying, and thus will be down on power. |
BTW: I learned the hard way many years ago that I was losing almost 40hp on a mild 375-400 SBC.
It was the headers - wanna guess how ? It's something I have never overlooked since then and I have seen it as an issue almost a dozen times since then. |
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