Woolfman Posted February 17, 2009 Report Posted February 17, 2009 Ok just so I would know exactly what kind of port work I have for when yall ask. I asked my port guy what he did and he told me he raised the exaust port, and matched all transfer ports just to let the motor flow better. So all you port guys what kind of port would that be? A dune port? He said that is all he did cause I didn't want to lose any bottom end. Everybody who has had port work done by him loves it and so do I he is a perfectionist so he takes a little longer and only does it for friends on all kinds of two stroke motors. But when I asked if it was a dune port he kind of looked at me funny maybe it's cause he mostly does it for mx racers. Quote
deckheight Posted February 17, 2009 Report Posted February 17, 2009 Hard to tell... One persons "dune port" might be anothers "trail port"... If you really want to know about your porting you will need to find out what the durations and time areas are for both the exhaust and transfers. Quote
blowit Posted February 17, 2009 Report Posted February 17, 2009 (edited) Ok just so I would know exactly what kind of port work I have for when yall ask. I asked my port guy what he did and he told me he raised the exaust port, and matched all transfer ports just to let the motor flow better. So all you port guys what kind of port would that be? A dune port? He said that is all he did cause I didn't want to lose any bottom end. Everybody who has had port work done by him loves it and so do I he is a perfectionist so he takes a little longer and only does it for friends on all kinds of two stroke motors. But when I asked if it was a dune port he kind of looked at me funny maybe it's cause he mostly does it for mx racers. The term "dune port" means nothing really. That is just a descriptive that applies to something in between a drag port and an MX port. It sounds to me like you got a mish mosh of porting. Raising the exhaust while just matching the transfers is the wrong way to go for MX in our opinion. We and most other engine builders would call this a play port or a trail port. I would have to see the entrance of the intake and transfers but that is what is sounds like. Glad you like it.. Brandon Edited February 17, 2009 by blowit Quote
flotek Posted February 19, 2009 Report Posted February 19, 2009 a descriptive label like "dune" or "mx" is a relative term that has no said industry standard ,personaly i would not consider that to even be a trail port though ,there are certianshapes widths and angles that will definitly have certain favorable characteristics .a builder must maintain a relationship between the exhaust and transfers to be done correctly ,this is your blowdown and if its off it can really hinder perfomrance and make a very narrow powerband ,banshee engines were originally designed in 1969 ,there is much more that needs addressed and many hours of extensive porting needs to be spent to get them to produce big power gains reliably . Quote
mopar1rules Posted February 20, 2009 Report Posted February 20, 2009 Ok just so I would know exactly what kind of port work I have for when yall ask. I asked my port guy what he did and he told me he raised the exaust port, and matched all transfer ports just to let the motor flow better. So all you port guys what kind of port would that be? A dune port? He said that is all he did cause I didn't want to lose any bottom end. Everybody who has had port work done by him loves it and so do I he is a perfectionist so he takes a little longer and only does it for friends on all kinds of two stroke motors. But when I asked if it was a dune port he kind of looked at me funny maybe it's cause he mostly does it for mx racers. i've always read that when you raise the exhaust port, you will lose bottom end. maybe i'm wrong? Quote
Snopczynski Posted February 20, 2009 Report Posted February 20, 2009 i've always read that when you raise the exhaust port, you will lose bottom end. maybe i'm wrong? You are right. Quote
Woolfman Posted February 20, 2009 Author Report Posted February 20, 2009 So what is the up side of raising the exhaust port? So are you guys saying I didn't get a very good port job? I'm fairly new to banshee's I'm used cr250s and cr500s from my moto days and that port worked good on those. Quote
locogato11283 Posted February 20, 2009 Report Posted February 20, 2009 thats obviously a mild dune port, swirled with a woods port and some drag sprinkles on top.. Quote
mopar1rules Posted February 20, 2009 Report Posted February 20, 2009 So what is the up side of raising the exhaust port? the up side would be that you will make more peak hp w/raising the exhaust port. bottom end is always sacraficed tho w/this method. you need to rob peter to pay paul. Quote
blowit Posted February 20, 2009 Report Posted February 20, 2009 thats obviously a mild dune port, swirled with a woods port and some drag sprinkles on top.. I did not see any drag sprinkles anywhere. Maybe some clean up candies though. B Quote
Woolfman Posted February 20, 2009 Author Report Posted February 20, 2009 thanks guys for all the imput now I can sleep at night :biggrin: Quote
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