Intake Runner Taper
Intake Runner Taper
(OP)
Hi all,
I have a question regarding intake manifold runner taper. I have read somewhere, don't remember where, that adding a taper to an intake runner has the effect of shortening the runner. The example I remember seeing said something to the effect of: a 2* taper on a 14 inch long intake runner will make the engine see an 11" runner. Is this correct?
If so how do you calculate runner taper to runner length to determine it's effect on cylinder filling at various RPM's?
Any help is greatly appreciated.
I have a question regarding intake manifold runner taper. I have read somewhere, don't remember where, that adding a taper to an intake runner has the effect of shortening the runner. The example I remember seeing said something to the effect of: a 2* taper on a 14 inch long intake runner will make the engine see an 11" runner. Is this correct?
If so how do you calculate runner taper to runner length to determine it's effect on cylinder filling at various RPM's?
Any help is greatly appreciated.





RE: Intake Runner Taper
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its pretty easy after you've done a lot of Research and Developement on Dyno and DragStrip
best results will be from 1.3 to 1.4 times intake valve area in sq. inches
you can make taper area larger, but start to loose runner length "tuning" effects.
the only reason to make Taper Area greater than 1.4 Ratio would be to try to get plenum's runner entry as much under carb throttle bores as possible
then it would be trade off/compromise between mixture distribution and correct runner length
Max_Taper_Area = Int_Valve_Dia * Int_Valve_Dia * .7854 * 1.4
safer;
Max_Taper_Area = Int_Valve_Dia * Int_Valve_Dia * .7854 * 1.3
inside plenum area max area = Max_Taper_Area
min recommended Taper Factor = 1.2
Larry Meaux (maxracesoftware@yahoo.com)
Meaux Racing Heads - MaxRace Software
ET_Analyst for DragRacers
Support Israel - Genesis 12:3
RE: Intake Runner Taper
Thanks in advance,
Colin
RE: Intake Runner Taper
Larry Meaux (maxracesoftware@yahoo.com)
Meaux Racing Heads - MaxRace Software
ET_Analyst for DragRacers
Support Israel - Genesis 12:3
RE: Intake Runner Taper
"diameter" ....its not the diameter ...but the area
the area is directly calculated
the diameter can be indirectly calculated from the area
Diameter = (Max_Taper_Area ^ .5) / (.7854 * Taper_Factor )
Taper_Factor = 1.4 max recommended 1.3= OK 1.2= minimum
Larry Meaux (maxracesoftware@yahoo.com)
Meaux Racing Heads - MaxRace Software
ET_Analyst for DragRacers
Support Israel - Genesis 12:3