RV8 Intake Route Length
Discussion
Any advice on the following would be most appreciated.
Having made some recent modifications that have altered the characteristics of the engine can anyone tell me what effect altering the length of the plenum to AFM (flapper injection) air intake pipe would have ?
Is there an ideal length for all applications (or specifically a TVR 4.5 litre) and if not then what effects would shortening, lengthening or straightening the route have ?
Thanks in advance.
Having made some recent modifications that have altered the characteristics of the engine can anyone tell me what effect altering the length of the plenum to AFM (flapper injection) air intake pipe would have ?
Is there an ideal length for all applications (or specifically a TVR 4.5 litre) and if not then what effects would shortening, lengthening or straightening the route have ?
Thanks in advance.
Reverend,
Aside from the fact that it looks like you have a hotwire mass AFM that is pretty much what it looked like after I moved the coolant tank - although I did move it to the windscreen bulkhead leaving the left inner wing clear.
Basically all I have now done (and I don't have the savvy to be able to get pics up) is to enclose the whole AFM and filter in a box with a big flexi hose running down the left wing and then under the PAS pump down to where the scoop will be mounted.
I did have to reduce the pipe between plenum and AFM further though in order to make room for the box as otherwise the bonnet strut hit it when closed. As the flapper AFM is bigger than the mass meter anyway this pipe is less than half the length of yours - around 110mm.
Shortening the pipe made a big diference to power delivery, almost as if the engine was unable to pull enough air. Tried it with the box lid off and inlet hose disconnected and just the same so it was purely shortening the intake pipe that did it, the box and hose aren't adversely affecting it.
Obviously it has had some kind of detrimental effect on airflow but does anyone have a definitive answer as to the hows and why and what is the ideal length ?
Aside from the fact that it looks like you have a hotwire mass AFM that is pretty much what it looked like after I moved the coolant tank - although I did move it to the windscreen bulkhead leaving the left inner wing clear.
Basically all I have now done (and I don't have the savvy to be able to get pics up) is to enclose the whole AFM and filter in a box with a big flexi hose running down the left wing and then under the PAS pump down to where the scoop will be mounted.
I did have to reduce the pipe between plenum and AFM further though in order to make room for the box as otherwise the bonnet strut hit it when closed. As the flapper AFM is bigger than the mass meter anyway this pipe is less than half the length of yours - around 110mm.
Shortening the pipe made a big diference to power delivery, almost as if the engine was unable to pull enough air. Tried it with the box lid off and inlet hose disconnected and just the same so it was purely shortening the intake pipe that did it, the box and hose aren't adversely affecting it.
Obviously it has had some kind of detrimental effect on airflow but does anyone have a definitive answer as to the hows and why and what is the ideal length ?
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