Intake question
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Intake question
So I read in a magazine a few times that, in regards to intake runner length, that long runners promote low end power, and short runners promote high end power (in the simplest of terms)
That being said, the 300 carb intake runners seem to be quite shorter than the 2 mile long intake runners on the efi 300....yet the carb 300s seem to make a tick more low end power than the efi 300s.
How does that work out?
That being said, the 300 carb intake runners seem to be quite shorter than the 2 mile long intake runners on the efi 300....yet the carb 300s seem to make a tick more low end power than the efi 300s.
How does that work out?
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There is a lot more to making power than manifold runner length. it is just one factor, fuel, timing, compression and in the case of the 4.9l cylinder head design are other factors. Yes lengthening the runners will boost lower end power but you have to compare apples to apples.
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From: Boise, Idaho
I think part of the difference in their power levels is that the stock carb'd motor came with a very restrictive intake and exhaust manifold (length of the runners aside) and a tiny 1bbl carburetor. The EFI system simply allowed more air in and out of the engine in terms of pure CFM.
The stock carb'd motor was around 120hp and 255tq whereas the EFI was 150hp and 265tq.
Throw the EFI exhaust manifolds onto a carb'd motor as well as a better breathing intake and bigger carb, and that alone will meet or beat the EFI power ratings.
Either way though, it's hard to tell without doing some serious how much the length of the runners factors in.
The stock carb'd motor was around 120hp and 255tq whereas the EFI was 150hp and 265tq.
Throw the EFI exhaust manifolds onto a carb'd motor as well as a better breathing intake and bigger carb, and that alone will meet or beat the EFI power ratings.
Either way though, it's hard to tell without doing some serious how much the length of the runners factors in.
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