Technical > Spud Miller's Cave

Injection tubes

<< < (3/3)

Cajuninjector:
We run 2-3/4 diameter hilborn and used the stock length tubes for a little while but ended up cutting them till they are only sticking up about 2"
We never saw any kind of gain or loss playing with stack length but our combo is probably a little different than most. 
This statement is straight from hilborns website:
Since horsepower gains of 5% to 10% are average for a system with ram tubes we strongly recommend using them on all models. The longer the ram tube length, the more low-end torque. The shorter the length, the more top-end torque

hotrod316:
awesome, thanks for the info from hilborns site. i would say that your engine prolly wouldnt know any real difference in the velocity stack lenth unless you went to a really long one, the manifold itself has to act as part of the ramtube, and i bet that you are limited to what that motor wants with that manifold length tube on it, a small length change on the velocity stack the engine prolly didnt even notice IMO.

I found the stock intake box boots were actually velocity stacks on a set of carbs i had, so i can going to use them on my racebike carbs and see if i can pick up any mph.  I will try making a set eventually and will do a study on whether length matters at high rpm fast mph.

Navigation

[0] Message Index

[*] Previous page