toolman Posted April 10, 2009 Report Share Posted April 10, 2009 Took my new pistons and cylinder to a new shop to get the cylinders bored. Started discussing banshee mods porting and such. One of the guys in the shop tells me you need to put the motor togather with out the head and when the piston is all the way down see if the port openings are completely open if not mark the piston and take it back apart and grind the top of the piston in the area that was marked until you get all the ports completely open. He said it is usually 1mm or less So he saying to notch the top of the pistons so you get full flow . I really do not want to grind on a brand new set of pistons. So what do you guys think? Is he crazy or what. Thanks Tim Quote Link to comment Share on other sites More sharing options...
xXBlessedWithDeathXx Posted April 10, 2009 Report Share Posted April 10, 2009 I believe its vitos power pistons that you can buy like that. i think its Vitos but not positive. Quote Link to comment Share on other sites More sharing options...
MILO Posted April 10, 2009 Report Share Posted April 10, 2009 personally, i wouldn't grind on any new piston for any reason. that's just asking for a disaster to happen. i'd rather have the porting corrected to match the stroke & pistons. Quote Link to comment Share on other sites More sharing options...
toolman Posted April 10, 2009 Author Report Share Posted April 10, 2009 He was telling me to grind notches in my new wiseco pistons. Quote Link to comment Share on other sites More sharing options...
brian Posted April 10, 2009 Report Share Posted April 10, 2009 Stay away from that clown ! Quote Link to comment Share on other sites More sharing options...
toolman Posted April 10, 2009 Author Report Share Posted April 10, 2009 I have been here since 2003 and never heard anything like this, I'm not going to start grinding on new pistons!!!!!!!!!!! We just ride trails we do not need the fastest machine just a good dependable one. Quote Link to comment Share on other sites More sharing options...
blowit Posted April 10, 2009 Report Share Posted April 10, 2009 Took my new pistons and cylinder to a new shop to get the cylinders bored. Started discussing banshee mods porting and such. One of the guys in the shop tells me you need to put the motor togather with out the head and when the piston is all the way down see if the port openings are completely open if not mark the piston and take it back apart and grind the top of the piston in the area that was marked until you get all the ports completely open. He said it is usually 1mm or less So he saying to notch the top of the pistons so you get full flow . I really do not want to grind on a brand new set of pistons. So what do you guys think? Is he crazy or what. Thanks Tim Sounds like you got some bad advice. Grinding on the top of the pistons is not all that bad if you know what you are doing but he probably did not tell you this will change the port timing too?? I would not recommend making any port changes unless you know what is going on there and sounds like you are best to assemble as is. Many machine shops have " an idea" what is going on but port timing is critical in them. Notching the pistons is a 40yo method of "poor man" porting but also good for testing theories because used pistons are always cheaper than new cylinders and easier to cut. Brandon Quote Link to comment Share on other sites More sharing options...
xXBlessedWithDeathXx Posted April 10, 2009 Report Share Posted April 10, 2009 i have a link below to show what i was talking about but they are made that way. Vitos power pistons. Quote Link to comment Share on other sites More sharing options...
Duneman101 Posted April 10, 2009 Report Share Posted April 10, 2009 piston notching was very common back in the day, in fact alexander Graham Bells book two stroke tuning mentions it a bunch of times, it has draw backs though like changing the integrity of the piston, could cause a grenade. i would just go with a reputable builder. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted April 10, 2009 Report Share Posted April 10, 2009 piston notching was very common back in the day, in fact alexander Graham Bells book two stroke tuning mentions it a bunch of times, it has draw backs though like changing the integrity of the piston, could cause a grenade. i would just go with a reputable builder. Yeah, it's talked about many times in that book... Quote Link to comment Share on other sites More sharing options...
flotek Posted April 11, 2009 Report Share Posted April 11, 2009 yeah well that idea was acceptable in 1965 but youd be way further ahead to have the cylinders sent out and professionaly ported by somene who uses a porting program and with many years exepriance there is no replacment for doing it the right way . Quote Link to comment Share on other sites More sharing options...
toolman Posted April 11, 2009 Author Report Share Posted April 11, 2009 Just to make things clear. I'm noT going to do any work on my pistons and it was not the people at the shop it was some guy that was there picking some parts up. Quote Link to comment Share on other sites More sharing options...
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