Possible Setup - Carbs And Linlet Tract Length

[chownr 0]

After doing some reading there seems to be a lot of info re TBs but not much about Carbs although Im sure most of the info is transferable. Am I right that to get the best benefit of low down torque the inlet tract should be as long as possible? The inlet tract lengths that have been used for an Mi16 seem to be in the range of 280-330mm. Is this the max that can be accomodated in the engine bay without massive alterations?

 

Calcs seem to suggest possible benefits of running a tract length of 300-350mm for a 7000rpm engine - can anyone comment?

 

What were the results from thos of you that did RR sessions varying tract length?

 

My current plan is to run R1 varbs on a short inlet manifold to create a valve to butterfly distance of 200mm. Then to use some trumpets on the back of the carbs to create an overall trumpet length somewhere around 330mm (more if posssible). ANy comments on this? id like to create something with as much low down torque as possible - I know Ill have to do RR sessions or live tests but am I starting in the right ballpark?

 

Std head with mild porting at the moment but plan on cam change over the winter (and yes I know the cam chanceg will affect everything!!

 

All comments welcome

 

Thanks

 

Rich