Special exhaust on Pinto
Hello,
some time ago I saw a photo of a rather "special" exhaustmanifold a Pinto (b/w photo).
Today I saw a Mk1 for sale with a similar manifold (other photo).
What's the effect of these "thingys" that connect 2 manifold-runners??
Regards, Leon.
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Re: Special exhaust on Pinto
ive had similar on some of my bike engines (in bikes) presumably trying to use one branch to create a scavenge effect on another, although possibly its actually to dampen exhaust pulses.
i remember reading from a well respected source that a lot of late 80's onwards bikes used to deliberately have steps or other measures in the exhaust to "kill" pulse waves, and thus get a very smooth step free non peaky power delivery.
for instance my old gsx 750 would pull from nothing to the red line with no sudden steps in power, you could give it full throttle at 2000 rpm in any gear and it would go whilst at the same time it pulled to the limiter at 13K, thats a 11K wide powerband!
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Racer
Re: Special exhaust on Pinto
It's for sure a "balance" pipe. I do believe not all about exhaust systems is already know. Worth giving it a try. Possible these things only work in a very tight combination of camshaft, duration etc... Never tried myself.
I did once had a "wrong build" manifold for an S2000. By accident the welder had joined 1 and 2 and 3 and 4 in a 4-2-1 manifold I ordered. I did not even noticed and engine went very well. After it came in for e rebuild I saw the mistake. We have corrected, hoping I could find more power but was not so and total power band was not better (did made other jumps is the torque line).
V8 and 2 cylinders usual need a balance pipe to work well.
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Re: Special exhaust on Pinto
My old Bonnevilles had balance pipes across the two cylinder although most racing bikes didnt have them ???
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