| [ Total Views: 1020 | Total Replies: 4 | Thread Id: 114013 ] |
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 paslow22
Seriously Crusin Dubber
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| posted on September 23rd, 2021 at 07:21 PM |
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Vintage Speed 43mm on a 1915?
Hello,
Thinking of a 38mm Super Sport (quiet ) or a 42mm full system for my 1915, but think the 42mm may be may be to big and noisy, currently have a Fatboy
it's noisy.
Anyone running 38 or 42 on theirs and what are the downfalls if any?
Any information would be a great help.
Thanks
Darryl
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 vw54
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Always Waiting 4 Friday
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| posted on September 24th, 2021 at 08:33 AM |
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I ran 38 mm pipes more than big enough for 1916 engine
Also made the front pipes fit inside heater boxes to keep warm in winter
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vw54
Super Administrator
Always Waiting 4 Friday
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| posted on September 24th, 2021 at 07:13 PM |
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pm sent
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 Bizarre
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The artist formerly known as blue74l
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| posted on September 25th, 2021 at 07:05 PM |
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Are you running heater boxes?
No point running a 42mm system if you are.
What sort of HP are you getting.
I ran 38mm (stock) on my 1916 with heater boxes and that made ~75 HP at the wheels.
Unless you are going for 100+ ponies I would stay with the38 mm system
Futue te ipsum!!!
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paslow22
Seriously Crusin Dubber
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| posted on September 26th, 2021 at 08:25 PM |
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| Quote: | Originally
posted by Bizarre
Are you running heater boxes?
No point running a 42mm system if you are.
What sort of HP are you getting.
I ran 38mm (stock) on my 1916 with heater boxes and that made ~75 HP at the wheels.
Unless you are going for 100+ ponies I would stay with the38 mm system
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HI,
Standard crank, twin 40 carbs, stock heads, 12 lb flywheel, 1.25/1 rockers, magna spark dist, and it goes quiet well.
I noticed more torque after fitting the rockers.
No Heater boxes, unknown horsepower, So I ordered a 38mm, should be a lot quieter, I'm half deaf and it's still to noisy.
Thanks for the input.
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