dusty_v141 Posted September 3, 2009 Report Share Posted September 3, 2009 hey guys i know this is an old post but i got a few questions. when you change the port timing dont you take metal out of the bottom of the port right? and those numbers are how long the port stays open? if i decide too put put small boost ports in what size would you recomend? i want too get a set of stock jugs when i get ahead on bills and stuff like that lol,if that ever happenes and do a full drag port too them. Thanks for the help guys. Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted September 3, 2009 Report Share Posted September 3, 2009 hey guys i know this is an old post but i got a few questions. when you change the port timing dont you take metal out of the bottom of the port right? and those numbers are how long the port stays open? if i decide too put put small boost ports in what size would you recomend? i want too get a set of stock jugs when i get ahead on bills and stuff like that lol,if that ever happenes and do a full drag port too them. Thanks for the help guys. most (99%) of the time on exhaust, main transfers, secondary transfers and boost ports, you take material off the top of the roof, to increase the duration (length of time a port is open). i guess there would be some time a guy might take some material off the floor of like an exhaust port.....that would only be if the floor wasn't low enough to begin with, where the piston crown edge was below the port floor @ bdc. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted September 3, 2009 Report Share Posted September 3, 2009 most (99%) of the time on exhaust, main transfers, secondary transfers and boost ports, you take material off the top of the roof, to increase the duration (length of time a port is open). i guess there would be some time a guy might take some material off the floor of like an exhaust port.....that would only be if the floor wasn't low enough to begin with, where the piston crown edge was below the port floor @ bdc. Or if you're building a stroker motor.... Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted September 3, 2009 Report Share Posted September 3, 2009 Or if you're building a stroker motor.... right. i should have posted that i was talking a stock stroke motor. Quote Link to comment Share on other sites More sharing options...
dusty_v141 Posted September 3, 2009 Report Share Posted September 3, 2009 o ok thanks. that answered alot of questions. what about boost ports;would they be good for a stock stroke bike. and if so where should i put them and how big do i need too make them.all the ones i have seen are at the very top of the intake. thanks again Quote Link to comment Share on other sites More sharing options...
Snopczynski Posted September 3, 2009 Report Share Posted September 3, 2009 Before you do anything, you should run some two stroke performance books like A. Bell's book, Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted September 4, 2009 Report Share Posted September 4, 2009 Before you do anything, you should run some two stroke performance books like A. Bell's book, ....very true. also, i would recommend the "high performance 2-sroke engine" book from john c. dixon. its a little too much in depth from the start, but makes a great book to read after the a. graham bells book. also, out of the extra boost ports that i've seen, 98% of them were on the bottom corner of the intake ports. Quote Link to comment Share on other sites More sharing options...
dusty_v141 Posted September 4, 2009 Report Share Posted September 4, 2009 ok my bad i have not seen a set with boost ports in awhile lol. do you think books a million have those books or can i read them on the net. thanks again Quote Link to comment Share on other sites More sharing options...
Darthwall Posted September 4, 2009 Author Report Share Posted September 4, 2009 hit up amazon.com or one of those sites for the books definatly read into it before you start messing around it might seam simple at first but if you go into porting blind you will go through alot of cash finding what the right way is. its an art that alot of people on these sites dont like to talk about because they had to find out the hard way and spend alot of time doing it I gave up on learning it cause I didnt have the time so I let someone on here do a set for me cause he wanted practice and well its been 6 or 7 months and I havent even seen them since so looks like LE got a free set of jugs Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted September 4, 2009 Report Share Posted September 4, 2009 hit up amazon.com or one of those sites for the books definatly read into it before you start messing around it might seam simple at first but if you go into porting blind you will go through alot of cash finding what the right way is. its an art that alot of people on these sites dont like to talk about because they had to find out the hard way and spend alot of time doing it I gave up on learning it cause I didnt have the time so I let someone on here do a set for me cause he wanted practice and well its been 6 or 7 months and I havent even seen them since so looks like LE got a free set of jugs I think I know who you are talking about. That kid is kinda a loser. He said that he was going to send me some money for a crank, but never did. Good thing I never shipped it out. For those books, I got some on amazon. Another good book is the one from gordon jennings. I'll post the link later. Quote Link to comment Share on other sites More sharing options...
Alex29573 Posted September 4, 2009 Report Share Posted September 4, 2009 is the general rule on the exhaust port that if you raise it you get top end and if you widen it you get acceleration? Quote Link to comment Share on other sites More sharing options...
mopar1rules Posted September 4, 2009 Report Share Posted September 4, 2009 (edited) is the general rule on the exhaust port that if you raise it you get top end and if you widen it you get acceleration? Both will give acceleration gains. Sometimes you only need to widen exhaust to get correct time/area. Sometimes you need to raise as well. Sometimes the blowdown period might be too short and you raise exhaust to increase blowdown time. Raising exhaust will take some bottom end away, but give you more top end. Widening the exhaust will increase mid-top and increase bmep and take nothing to little off the bottom. Edited September 4, 2009 by mopar1rules Quote Link to comment Share on other sites More sharing options...
Darthwall Posted September 4, 2009 Author Report Share Posted September 4, 2009 I think I know who you are talking about. That kid is kinda a loser. He said that he was going to send me some money for a crank, but never did. Good thing I never shipped it out. For those books, I got some on amazon. Another good book is the one from gordon jennings. I'll post the link later. ya thats the same guy I bought some of his suspention parts from him and they showed up quick and with no problems so I thought he was a good guy well Ive been wrong before and I think this was another of those times Quote Link to comment Share on other sites More sharing options...
dusty_v141 Posted September 4, 2009 Report Share Posted September 4, 2009 ok goys i will read into it while i saving too buy a set of jugs.your right, it is an art and you have too be patine or you will screw it all up lol.i have not read everything yet but i have read alot on this site "MacDizzy The Enthusiast website". there is alot of stuff in there that is really interesting. i think i am going too go to school and be a machinest,and i want my own custom parts and high performance shop someday. thanks guys. Quote Link to comment Share on other sites More sharing options...
BSHEE400 Posted September 4, 2009 Report Share Posted September 4, 2009 here you go clicky linky Quote Link to comment Share on other sites More sharing options...
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