EFI, Edelbrock vs Holley vs FAST vs Accel
#21
Registered
The flow of a manifold runner is only signifcant when you're comparing runners of equal length and size. If not, you're comparing apples to oranges. The tunning effect of the runners can be significant, and since we already know the dart manifold tunes WAYY too high for these engines, any increase in flow might easily be undermined by the lack of tunning.
Also, because the single plane plenun volume is compromised for fuel distribution with a carb, and the flow bench is only flowing one runner at a time, the larger plenum volume of the HP500 manifold, although still not as large as it should be, will make a real difference in actual "on engine" airflow, since the dart runners will end up stealing airflow from each other.
Then we have other factors such as unequal airflow between cylinders from the horribly non-symetric runners on the single plane manifold, and all the extra fuel you need to throw at the engine to make up for that, and that doesn't even start to take into account the idle and torque characteristics of the longer runner manifold which will be significantly better than the single plane carb manifold.
You start to see that the flow bench is not always the best place to compare intakes, unless you are only looking for one factor.
I did data aquisition in one of the top airflow facilities in the world for over a decade, and although the flow bench ruled for developing cylinder heads, and also for refining an existing manifold design, it was not used to decide which manifold was better.
Whewww, meant to write a sentence or two. Weird what comes pouring out of a human brain, even after 6 years away from the stuff.
#23
Registered
I'm sure you are right, there's no reason to see if an intake runner flows more or less than the cylinder head it's going to be attached to. No reason to check our port work either, just hack into it and assume it's better. The ported out Dart tunnel ram I was referring to only made just shy of 800 hp @ 5700 and 741 lb of torque @ 4100, on a 9 to 1 583, N/A pump gas motor.
My comment was just an opinion, I really don't care what you run, good luck with it.
My comment was just an opinion, I really don't care what you run, good luck with it.
To be honest, if I really wanted to show your ignorance, I would have pointed out just how silly you sounded offering "flow numbers" for a manifold without any sort of conditions behind the numbers: with or without the head, what type of heads, pressure drop (which is NOT standard for manifold testing), but then again, my fault for trying to provide some real info around here instead of just jumping in with rude insults!
#24
#25
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#26
Charter Member #601
Charter Member
Smitty, I was wondering about that price!! Was going to order a few for myself. That and MSII and harness would have been under $1K. I am glad you did the leg work, saved me some time.. Thanks!!
Dick
Dick
Last edited by Mr Gadgets; 05-08-2009 at 05:49 PM.
#28
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The price was incredible though,too bad it wasn't correct. I just paid 509$ for a FAST throttle body so when I saw a whole bbc kit for 519$ I figured if they actually would sell it for that I would buy some up,I know several people that want more power out of there mpi systems,that would allow you to upgrade and still use most the stuff you already had,Smitty
#29
Charter Member #601
Charter Member
GPM, I read that and saw what you mean. Then I got to thinking they didnt actually identify the Holley equipment. I wonder if it was apples to apples comparison.
But you are correct. 989hp is a lot. I dont know if you could make a manifold and gain a heck of a lot doing it. At that level, bolting one on.. and making that power is simple enough.
But you are correct. 989hp is a lot. I dont know if you could make a manifold and gain a heck of a lot doing it. At that level, bolting one on.. and making that power is simple enough.
#30
Either one would be an improvement over the Mercruiser or Arizona stuff. You could use any ECM, harness and injectors. I'm sure you would lose less HP to back pressure when using a centrifical supercharger.
Last edited by GPM; 05-08-2009 at 08:12 PM.