howardsmed
Ragged trousered Philanthropist
Hi JackAnd a dyno sheet to prove what exactly? No peeps on my end, I've proved my point years ago , do you think you're the only one who's digested the XS 650 head for extra flow that yielded positive gains? And besides, I was making a friendly comment to have a conversation with Christian, not you, so why are you being so defensive? This is one of the reasons I left this forum, people like you who get their feathers ruffled by misreading the context of the message. The work you've done is nothing new( but it's pretty porn) as I was doing it decades ago just never pushed it to your extent and went in another direction to achieve my personal goals in reconstructing the intake port and like you I was successful. Christian if you're reading this, glad to see you come back every now and then........Later
On the 880 we raised the inlet port by around 6mm, Steve Mann who owned and raced the bike did the work, have you done the same ?
Steve machined the head ( and broke into the bottom of the spring pocket) and shrunk in a an aluminium tube,
I did something similar but far less elaborate on the SR500 head, it has sufficient casting thickness to lift the port + 6mm, and then weld the floor in ( see pic) i have access to a flow bench, a friend has an SF600 with data acquisition capabilities, and enormous knowledge ( albeit not on SR500, but Subaru turbo drag racers) have you done this ? and what are the gains?
I based the straight shot approach as per the Yamaha 5 valve engines where you can see the piston, looking down the carb or injector body, they flow well, and produce good power with very mild cams
we are 1/2 way into a 908cc engine with XV750 pistons and an 84mm stroke, will be nice to see how that goes
Howard