Hi Guys,
Seen these about a bit on Autograss cars & was wundering if anyone knows the therory behind them, what they do?
Seen these about a bit on Autograss cars & was wundering if anyone knows the therory behind them, what they do?
just a plenum extender for an SU carb maybe paul ? a bit like EBB,s t/b stack ?
Paul aren't they just longer inlet tracts?
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My mechanic did a few articles about this on his Capri engine, he had really long inlet tracts, then started chopping them back whilst the car was on the RR, there is some mathematical formulae for optimum torque/bhp ratio, ill see if he's got his articles on PDF and mail them to you if you like? It's a bit of a dark art though!
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just down to airflow i guess, the inlet valve closes after bottom dead centre eh, and this causes reversion (more reversion on long duration cams).so a long narrow tract will create a faster airflow, and less reversion hence the common bunch of banana,s modern design mani,sThat's it Dave yeh I was just wondering how this improved torque ...
Dunno actually, don't wanna seem too keen! Maybe next week although it may be later in the year as there is always a lag, mad ####er had a reliant robin that is now turbo'd, on Tbs, and running on ethanol! Blokes a mad scientist!
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just down to airflow i guess, the inlet valve closes after bottom dead centre eh, and this causes reversion (more reversion on long duration cams).so a long narrow tract will create a faster airflow, and less reversion hence the common bunch of banana,s modern design mani,s
dunno paul, i think is just a way to counter the inlet closing lag of a peaky cam, so you can cram extra air in during the high torque area (4k ish).Cheers Frank, would this make any difference if the longer tube was after the throttle butterfly? Or is the point it's between the inlet valve and tb?
Cheers Frank, would this make any difference if the longer tube was after the throttle butterfly? Or is the point it's between the inlet valve and tb?
dunno paul, i think is just a way to counter the inlet closing lag of a peaky cam, so you can cram extra air in during the high torque area (4k ish).
so running a race cam can create so much reversion that the powerband does,nt start till 5k, but the torquetube speeds up the airflow and cancels out some of the reversion i guess
Jenvey write a good summary on intake selection criteria and what to consider when making selections Paul.
http://www.jenvey.co.uk/jenvey/throttle-body-selection-with-jenvey-dynamics
I've mailed mark so ill see if he comes back to me, if not ill have to dig out the copies and scan them etc!
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