Four into One Does Go....

That's going to change the characteristic of the engine torque curve, with the branch lengths so much shorter and the 4:1 rather than 4:2:1 arrangement. I believe it will help the top end a bit while softening up the middle, but I'd have to refresh my memory on that. How much of an effect will depend on how much attention Rover paid to the TC's exhaust tuning.

It looks like a fine solution to the cracking problem.

Yours
Vern
 
That's going to change the characteristic of the engine torque curve, with the branch lengths so much shorter and the 4:1 rather than 4:2:1 arrangement. I believe it will help the top end a bit while softening up the middle, but I'd have to refresh my memory on that. How much of an effect will depend on how much attention Rover paid to the TC's exhaust tuning.

It looks like a fine solution to the cracking problem.

Yours
Vern
I seem to remember Mr york saying that rover pursued all out power at the top on on the tc... So for everyday drivability your exhaust may well be an improvement.
 
That's going to change the characteristic of the engine torque curve, with the branch lengths so much shorter and the 4:1 rather than 4:2:1 arrangement. I believe it will help the top end a bit while softening up the middle, but I'd have to refresh my memory on that. How much of an effect will depend on how much attention Rover paid to the TC's exhaust tuning.

It looks like a fine solution to the cracking problem.

Yours
Vern
I have a 2200TC and the 2 into 1 section where the manifold meets the exhaust pipe is formed by flattening the two pipes into two semicircles and welding them into an exhaust pipe sized collar - looks less than optimal. I have looked in the workshop manual and now obtained a second hand manifold where the two pipes go into a proper 2 pipe collector then into a single pipe and collar. The 2200TC version looks much more restrictive.
 
That was a change round about the series 2 introduction from the earlier style with a traditional collector. I'm not sure it's actually a step back, though it's fair to assume it was done mainly to cut costs. I've seen aftermarket headers for V8s done the same way, with the claim that the flattened pipes improve flow with a bit of a venturi effect that keeps the gas velocity high as it merges and continues into the downstream pipe.

Yours
Vern
 
Hi, It's not exactly an extractor manifold with unequal length primaries. Cost cutting I would say as well, along with more reliability in terms of less breakages through poor fitment or mounting.

Colin
 
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