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Paul Dunstall did something similar to this on Nortons :
Well if you can call a 2 into 1 into 2 similar to a 2 into 2 with an X shape balance tubes then yes I suppose it's similar!Paul Dunstall did something similar to this on Nortons :
Yes but the SF was similar to a commandoAl, looking at the thread title… and then at your post… my thoughts are: its a Laverda…
It's rearward facing, and will deflect slightly as it gets bevelled off. No worries.I'm more curious about why they kept the damn mainstand attached? Look how close that thing is to the pavement, could be a fine way to get chucked if it catches
It's a 360 degree twin. The five hundred Lavs are 180 degree.If you use a 2 into 1 exhaust and advance the opening point of the exhaust valve, if theyre is no restriction paat the collector, you get more torque but also more noise. The Exup on some superbikes is supposed to deliver more torque, but what it really seems to do is reduce the noise which comes from more radical valve timing.
The cross under the motor of the Laverda motor allows both header pipes to exhaust into both mufflers. So the noise problem is reduced without increasing restriction.
Paul Dunstall's exhaust had a collector which exhausted into a short piece of tail pipe which had a reverse collector and two mufflers. The Laverda is a 180 degree twin, so the pulses are not regular, as they are with a Norton engine. The SFC Laverda exhaust still seems to work well. I watched the bike in the picture trounce all the fast Z900 Kawasakis at Phillip Island , back then.
I think a 2 into 1 exhaust cannot work well with a 180 degree crank motor due to interference, but it would still be better than a restrictive exhaust.
No he didn't! Most of the section under the bike is a single pipe!Paul Dunstall did something similar to this on Nortons :
I still have the two downpipes from my dunstall system
Following a mechanical disaster and to accommodate a different cylinder head temporarily, I did exactly that with a Dunstall front Y section, under the motor and into a speedway 'silencer'....I still have the two downpipes from my dunstall system
The Y at the rear rotted first so I cut that off and ran it with a single megga directly under the motor
Then the front Y section rotted through and I gave up with it