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TVR exhaust questions...
Posted: Sat Nov 14, 2009 12:13 pm
by topcatcustom
Are the manifold primaries all the same diameter from different models with the front facing exhausts? i.e. 400, 450, 500...
And does the fact that the primaries are all completely different lengths make much of a difference or does it broaden the power range?
Posted: Mon Nov 16, 2009 10:40 am
by kiwicar
"And does the fact that the primaries are all completely different lengths make much of a difference" Yes it means you get no resonent tuning and no gain over a cast manifold.
"or does it broaden the power range?" only in that it give you no aditional power at any point in the rev band.
Mike
Posted: Mon Nov 16, 2009 11:04 am
by spend
Yes the manifolds are the same for all the chim/griff models, just some variations over the production run ie pre catconv models, bolted flanges and clamped flanges.
The lengths are a bit of a hypothetical puzzle, equal length manifolds have only made good gains when compared to poorly fettled manifolds, when compared to 'nicely' matched manifolds gains were minimal. Its fairly hard to equate all the results we have seen, but I have personally witnessed quite a lot of the testing in this area.
IMHO smooth flowing close to the ports / flanges seems to be most beneficial. If wishing to go further then arranging merges to defer 90deg conflicts/collisions seems plausible without resorting to the complexity of a full 8-4-2-1. Having said that the aftermarket solutions from JP/ACT with long primaries (instead of the big precat collector & cat dustbin) do seem to work just about as well as anything?
Posted: Mon Nov 16, 2009 11:12 am
by topcatcustom
Its a bit of a bugger as I have very little room for the exhausts and I may be able to squeeze TVR ones in- but just not sure if they would be much good or not!
On a seperate note is there enything wrong with the TVR mufflers as used on Tuscans etc?
Posted: Mon Nov 16, 2009 12:13 pm
by spend
The looping round the front, and a y-piece down the front of the engine has lets say 'unique' challenges :hehe:
I guess you are talking about the later T-series cars perpendicular silencer arrangement? Cerberas also use a similar arrangement.
Tuscan racers are probably of more interest to you, with extremely long complex primaries, but exits by the passenger door sill.