03-12-16, 04:15 PM
Hi Slappy,
My understanding is that it is not so crucial on a 4 stroke, but, on a 2 stroke removing all the baffles is the kiss of death because the 2 stroke does not have exhaust valves and relys on the restriction of a baffled exhaust to retain back pressure, I know that there are very noisy expansion boxes for strokers but their design/shape helps retain the back pressure.
As back pressure is not so important on a 4 stroke because of the exhaust valves doing the job I would think that it would do very little to the mixture to Petrol/Air ratio. I know with my race can (PipeWerks) it says in the bumph that come with it, that no mixture adjustments is necessary with or without the baffle in. The only real difference then if that is true is the sound and maybe, just maybe, the exhaust gasses clear the system a tad quicker, where or not that would impact on power I don't know if it did it would be for the positive i would imagine.
If anyone knows different to that please do say as I am only going on what I have heard and read and not through any real knowledge or experience.
Other than removing the baffles with a 2 foot long piece of galvanised water pipe and a club hammer many many years ago on a 250cc Ambassador Villier 2 stroke twin, it made a huge difference to the way the bike performed, with baffles in 82 mph with baffles out 72 and absolutely gutless, reverse tuning I believe its called.
Anyway Miniear & Bruce of Guildford ordered me to new silencers that cost me 23 quid, it don't sound much I know but it was in the late 60's.
My understanding is that it is not so crucial on a 4 stroke, but, on a 2 stroke removing all the baffles is the kiss of death because the 2 stroke does not have exhaust valves and relys on the restriction of a baffled exhaust to retain back pressure, I know that there are very noisy expansion boxes for strokers but their design/shape helps retain the back pressure.
As back pressure is not so important on a 4 stroke because of the exhaust valves doing the job I would think that it would do very little to the mixture to Petrol/Air ratio. I know with my race can (PipeWerks) it says in the bumph that come with it, that no mixture adjustments is necessary with or without the baffle in. The only real difference then if that is true is the sound and maybe, just maybe, the exhaust gasses clear the system a tad quicker, where or not that would impact on power I don't know if it did it would be for the positive i would imagine.
If anyone knows different to that please do say as I am only going on what I have heard and read and not through any real knowledge or experience.
Other than removing the baffles with a 2 foot long piece of galvanised water pipe and a club hammer many many years ago on a 250cc Ambassador Villier 2 stroke twin, it made a huge difference to the way the bike performed, with baffles in 82 mph with baffles out 72 and absolutely gutless, reverse tuning I believe its called.
Anyway Miniear & Bruce of Guildford ordered me to new silencers that cost me 23 quid, it don't sound much I know but it was in the late 60's.