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knuckle head
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knuckle head
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Looking for a A65 or A10 siamese exhaust or 2 into 1 aftermarket pipe is any condition so long as the pipes before the junction are not dented..Thanks


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
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I think classic British spares carries them

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I may have a set or 2....i'll look this week
Bill in OHIO

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knuckle head
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knuckle head
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Originally Posted by BillHerring3
I may have a set or 2....i'll look this week
Bill in OHIO
Thanks, do let me know, Tony


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
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Went to the Warehouse found the main pipe NOS...but the short pipe looks too long..send me your email or ph # I'll send 2 pics 419-466-7444
regards Bill

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knuckle head
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PM sent


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
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Bill,
If you have another set I would be interested
Thanks,
Richard

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what is the advantage, if any, of siamesed pipes in this application?

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knuckle head
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knuckle head
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Less parts....Some claim more power, some say less, some say no difference.....


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
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Don't know what he's building but a good tuned set of 2 n 1 headers can do wonderful for the bottom end pull and mid range. Great fun for the eighth mile dirt, worked well for me on A65 anyway. but retired the pipes few years ago and just kept for memories.

[Linked Image from i.postimg.cc]

Last edited by breeze1954; 12/20/20 11:10 pm.

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Originally Posted by breeze1954
Don't know what he's building but a good tuned set of 2 n 1 headers can do wonderful for the bottom end pull and mid range. Great fun for the eighth mile dirt, worked well for me on A65 anyway. but retired the pipes few years ago and just kept for memories.

[Linked Image from i.postimg.cc]

nice collection. how do u tune them?

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Didn’t mean to alter the thread; but the headers are made to exact equal dimensions. Then you pick your silencer and just jet and tune the bike to match what you want. What you have coming in and what you have going out have to be in proportion with each other. That’s what I was taught anyway and it always seemed to work well for me. Though I do tend to run my old bikes a little rich now these days.


Nothing ticks you off more than that moment during an argument when you realize you're wrong!

Tim Kirby

Small print Disclaimer: I am not responsible for spelling, grammar or political correctness. Actually I'm not very responsible at all!
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DOPE
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i run 1-5/8 inch open pipes on a T120, and tune them with extensions

the bare pipes are 32 inches and i can clamp on tubes that make them 34, 36, 38, and 40

[Linked Image from i.imgur.com]

on this machine th ebest length is 34, which is way shorter than even ordinary TT pipes

wouldn't know what to do with a muffler though. that introduces multiple complexities, like a megaphone.


i'm old enough to remember when patriotism meant not trying to overthrow the government.
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knuckle head
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Eddie Dow the known BSA tuner liked the unequal length siamese pipes on the A10....That was then and more is known about exhaust tuning...
Like Kevin I have found a 34 inch pipe to make the best speed, but 1.5 diameter .....Our bikes are very close in performance
but have different carbs, cams and so on but like the same pipe length
Current thinking is the intake, cams and exhaust must all work together, each requiring adjustments.....
The A10 I am building is just a fun back road bike, no need fror maxmum power


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"
Joined: Dec 2013
Posts: 5,745
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DOPE
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the unequal pipe thing may have been to broaden the power band by peaking the cylinders at slightly different rpm

like tuning ignition, exhaust, and intake 500 rpm apart. they don't give you the highest peak but it spreads out more

dunno how vibration would be affected

leo goff told me to use 1 5/8-inch pipes. i have some standard TT pipes to experiment with, 1 3/4-inch and whatever their length should be. i think the length was pretty much stadardized by years of flattrackers.

Last edited by kevin; 12/23/20 12:10 am.

i'm old enough to remember when patriotism meant not trying to overthrow the government.
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knuckle head
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[quote=kevin]the unequal pipe thing may have been to broaden the power band by peaking the cylinders at slightly different rpm

I like that line of thinking......


79 T140D, 89 Honda 650NT ,61 A10 .On a bike you can out run the demons
"I don't know what the world may need
But a V8 engine is a good start for me
Think I'll drive to find a place, to be surly"

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