Zonko
Stainless
- Joined
- Aug 20, 2011
- Location
- Northern Germany
Sooo, been a long time, stayed away from PM on purpose, just had too much electric engineering and general life related stuff to take care of to be flooding my mind with really cool but less important mechanical knowledge
I have a Honda 750, the last version of that legendary series, the CB 'Sevenfifty' RC42. The same engine was sold in the US in a slightly different frame and called the CB 750 Nighthawk ,i believe.
Exhaust system is this monster:
https://www.totalparts.nl/picture/motorsloop/000000053364-1.jpg
Unfortunately that usually looks like this:
https://www.dd6vsk.de/fotos/0515-exhaust2.jpg
The crome plate on that weird collector/interference manifold dies and the thing declares itself holy....ehhh...holey .
Sounds kinda nice but impedes engine performance and i don't want a cop magnet for an everyday ride. Used exhausts are crazy expensive because they all die and aftermarket is even worse because the rc 42 is rather rare and German vehicle inspection rules are insane in 5 dozen different ways. Making it commercially unfeasible to offer good solutions to most engine related problems unless there is sufficient volume to pay for all the legal nonsense.
So, i will weld that thing or have it welded. At least 2 confirmed holes, both currently plugged with glass fibre mat, annealed sheet copper and a bunch of strong stainless hose clamps - which works well enough to be rideable but still has the exhaust pop and the engine braking behave jerky at low revs due to the carbs being not quite in sync with the unsymmetric, leaky system.
Probably more pinholes or weakspots at the very least.
I have access to: Stick(*chuckle*) and oxyfuel.
Very little experience with oxyfuel welding but i do braze a lot and to my big surprise i actually managed to weld sheet metal of similar thickness without much trouble. Sure, any real welder would laugh at them, but sheesh, that exhaust can't get any worse looking.
What has me troubled is distortion. Lets assume i weld up 2 big holes and 3 nasty spots that are almost blown with patches and oxyfuel. Will that thing still fit the bike ?
Should i have that mig welded instead ? Less heat in a smaller area......
I have a Honda 750, the last version of that legendary series, the CB 'Sevenfifty' RC42. The same engine was sold in the US in a slightly different frame and called the CB 750 Nighthawk ,i believe.
Exhaust system is this monster:
https://www.totalparts.nl/picture/motorsloop/000000053364-1.jpg
Unfortunately that usually looks like this:
https://www.dd6vsk.de/fotos/0515-exhaust2.jpg
The crome plate on that weird collector/interference manifold dies and the thing declares itself holy....ehhh...holey .
Sounds kinda nice but impedes engine performance and i don't want a cop magnet for an everyday ride. Used exhausts are crazy expensive because they all die and aftermarket is even worse because the rc 42 is rather rare and German vehicle inspection rules are insane in 5 dozen different ways. Making it commercially unfeasible to offer good solutions to most engine related problems unless there is sufficient volume to pay for all the legal nonsense.
So, i will weld that thing or have it welded. At least 2 confirmed holes, both currently plugged with glass fibre mat, annealed sheet copper and a bunch of strong stainless hose clamps - which works well enough to be rideable but still has the exhaust pop and the engine braking behave jerky at low revs due to the carbs being not quite in sync with the unsymmetric, leaky system.
Probably more pinholes or weakspots at the very least.
I have access to: Stick(*chuckle*) and oxyfuel.
Very little experience with oxyfuel welding but i do braze a lot and to my big surprise i actually managed to weld sheet metal of similar thickness without much trouble. Sure, any real welder would laugh at them, but sheesh, that exhaust can't get any worse looking.
What has me troubled is distortion. Lets assume i weld up 2 big holes and 3 nasty spots that are almost blown with patches and oxyfuel. Will that thing still fit the bike ?
Should i have that mig welded instead ? Less heat in a smaller area......