| through a stock head with 3 angle valve job.... - And at .1 inches of exhaust lift;
open exhaust ports (free air) flows 75.6 cf/min @ 28inches of mercury
stock exhaust manifold flows 63.61 cf/min " " " "
stock hand ported manifold flows 67.5 cf/min " " " "
greg dupree tubular manifold flows 73.41 cf/min " " " " - at .2 inches of exhaust lift;
open exhaust ports (free air) flows 144.82 cf/min @ 28inches of mercury
stock exhaust manifold flows 95.09 cf/min " " " "
stock hand ported manifold flows 93.12 cf/min " " " "
greg dupree tubular manifold flows 136.77 cf/min " " " " - at .3 inches of exhaust lift
open exhaust ports (free air) flows 163.7 cf/min @ 28inches of mercury
stock exhaust manifold flows 99.6 cf/min " " " "
stock hand ported manifold flows 99.6 cf/min " " " "
greg dupree tubular manifold flows 148.18 cf/min " " " " - at .4 inches of exhaust lift
open exhaust ports (free air) flows 178.28 cf/min @ 28inches of mercury
stock exhaust manifold flows 101.0 cf/min " " " "
stock hand ported manifold flows 101.8 cf/min " " " "
greg dupree tubular manifold flows 150.8 cf/min " " " " in summary,
stock manifolds have a total loss of flow of 133%
hand ported stock manifolds have a total loss of flow of 128%
greg duprees tubular manifolds have a total loss of flow of only 33%.
(percentage can be seen as "lacks effeciency", higher = worst) the greddy tubular manifolds come in at a low 21% and
pentroof manifolds are 13% Just doesn't seem worth the time to me :\ Got this info from nixit
Thanks,
Mike
1991 Black Twin Turbo (Show and Go) 
FAVORITE QUOTES----- "I think I'll pass on giving my car a handjob" - joel(PA)
"I wish I had a woody. (n/m)" - fairladyz90999
"I did plug the holes, But I did it by taping over them a lot, I didnt think that maybe HOT air is comming through there, And it melted the tape, damnit im an ass." - DC 21
"If I wanted a smooth ride, I would have bought a Lincoln." |
