Triple cylinder header designs - MVAgusta.net
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post #1 of 23 (permalink) Old 03-07-2014, 11:49 AM Thread Starter
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Triple cylinder header designs

The thread "Exhaust options. F3-B3-Rivale-Turismo Veloce" got me thinking about the difference in exhaust header designs. Years of racing have taught me that things like header length, collector style and volume all play their part. But it's still somewhat of a black art to me. A quick search revealed some different approaches to the problem of gaining horse power and torque for triples.

This is the MV Agusta's 675 race unit.



Notice the outside cylinders Siamese together whereby the middle runs separate. It does however increase in size but there are no balance tubes as such.

This is Termignoni's effort.



Very traditional design with three pipes of near equal length, (middle pipe appears to be slightly longer). Balance tubes are placed adjacent to each other at about 1/3 distance between the outlet port and the collector.

At first glimpse HP Corse's header looks to be a copy of the Termi.



However, looking closer they are quite different. Bends are greater, balance tubes are closer to the outlet port and there is a lack of formal collector.

For comparison here is the stock Triumph 675 beside it's Arrow replacement.



First thing you notice is how much the Arrow unit matches it's stock counterpart. The second being the balance tubes on such an angle.

As I do not build performance exhaust systems for a living anything I say would be pure speculation. However, we do have some experienced types on here. I'm sure we'd all be keen to hear from those who have used different makes as to what their feelings were. What are the possible reason to chose one design over another? Anyone?

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Last edited by Stephen W.; 01-27-2016 at 09:48 AM.
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post #2 of 23 (permalink) Old 03-07-2014, 06:49 PM
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Triple cylinder header designs

I have no insights. But I am subscribing to this thread.

Great topic, Stephen. Is Kevin Cameron on this forum?

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post #3 of 23 (permalink) Old 03-16-2014, 09:22 PM
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I have no insights. But I am subscribing to this thread.

Great topic, Stephen. Is Kevin Cameron on this forum?
Be nice if he was, I'm curious too. Great pics and observations!

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post #4 of 23 (permalink) Old 03-17-2014, 06:20 PM Thread Starter
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I’ve been researching lots and so far all I’ve managed to do is prove the old adage; “the more I learn the less I know”.
Although this article I've linked is more about auto headers it is probably one of the best / briefest summaries I’ve read so far. It is a little dry but if you read it all the way through while referencing the different photos from my first post you’ll start to understand which change does what.

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post #5 of 23 (permalink) Old 03-17-2014, 07:45 PM
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Interesting article, Thanks!

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post #6 of 23 (permalink) Old 03-19-2014, 10:03 PM
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Wink pipes?

Stephen;
pipes are simple.....its acoustics, Henry Ricardo got Knighted for figuring it out in 1928
Bill "Grumpy" Jenkins figured out reversion
Daniel Bernoulli figured out flow in 1738

here is the Pipe Formula Program I wrote for an HP 42S calculator ~30 years ago;
http://www.apriliaforum.com/forums/s...pipe%20formula

only bikes have crossover pipes

if you can't make them exactly the same length.....learn to knit

I like "merge" collectors.....they take a little off the top but they widen the torque peak

the posted pictures......

the MV race pipe is a disaster....the pulses are all fucked up by the different lengths and the collector is too small and maybe too short

Termignoni angled crossovers whats with that?
don't like the collector again too small and maybe too short

HP Corse hands down best pipe here.....ditch the crossovers though again collector too small and maybe too short


the collector must be the same length as the head pipe from the exhaust valve to the collector......

its acoustics

Stephen in post#4 is that a triple? the outside pipe must go to the top of the collector.....or they have to make a corkscrew out of the middle pipe to eat up the length

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post #7 of 23 (permalink) Old 03-20-2014, 05:07 AM
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I read that whole article and it left me amazed at what people do for a living. Motorcycle headers seem to have the additional challenge of putting it all together in a package that fits in the space inside the fairings.

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post #8 of 23 (permalink) Old 03-20-2014, 05:14 AM
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Quote:
Originally Posted by silentservice703 View Post
I read that whole article and it left me amazed at what people do for a living. Motorcycle headers seem to have the additional challenge of putting it all together in a package that fits in the space inside the fairings.
And not just always the most power Chuck, but the most usable too.

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post #9 of 23 (permalink) Old 03-20-2014, 05:16 AM
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Stephen in post#4 is that a triple? the outside pipe must go to the top of the collector.....or they have to make a corkscrew out of the middle pipe to eat up the length
No, that's a YAMAHA M1 4 banger Noel.

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That would have to be true when designing for street use...or the track too, I suppose.

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