sleeper06 Posted March 19, 2008 Report Share Posted March 19, 2008 I just got done porting my stock cylinders for a 4mil. I have shearer inframes,35mil pwks,4mil stroke 5mil long rod. My exhaust is 27.5mm from deck, i lowered my intakes as much as possible,transfer top at44mm(stock),I lowered all transfers and exhaust to match piston BDC. Iwas wondering if an additional boost port would would bennifit me.IF one of the porting gurus could contact me.I was planning on boring my jugs tommorow if i feel better but wanted some insite before i did. im looking for a drag port so any adjustments can still be made. if you dont want to post up,PM me. THANKS My usual go to guy isnt open at 10:30 at night Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted March 19, 2008 Report Share Posted March 19, 2008 Some of the big builders I have talked to and seen portwork done by don't use auxillary ports. I had cut them in my first set of cylinders and Lynn at LC Performance told me to fill them in because he has expirimented with them extensively and found that they slow you down. Rudy Kurtz (Port Magic) doesn't use them and I also don't think K&T uses them either. Also, you're running more exhaust duration than me along with about the same trans duration, I was told I should increase my transfer duration even more to work with my exhaust duration. Keep in mind my porting is a dune port for stock stroke and I am at 26.5mm (196 deg) on my exhaust and 42mm (125.5 deg) on my transfers.... I was told I would see more gain if I increased my trans duration into the high 120's or about 41.2mm from the deck. You may want to research your timing a little more before you go throwing it together. Quote Link to comment Share on other sites More sharing options...
Bansh-eman Posted March 19, 2008 Report Share Posted March 19, 2008 (edited) when you say auxillery ports are you reffering to the small ports drilled at an angle at the bottom corners of the intake like in this pict? btw thats a blaster motor so dont worry about it having them on top as well Edited March 19, 2008 by Bansh-eman Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted March 19, 2008 Report Share Posted March 19, 2008 when you say auxillery ports are you reffering to the small ports drilled at an angle at the bottom corners of the intake like in this pict?btw thats a blaster motor so dont worry about it having them on top as well Yes, those are the ports I was referring to, many people call them boost ports or boyesen ports or worm holes. As I understand the "boost port" or dust port as it is otherwise known is the one in the center above your intake windows. BTW, is that pic of the blaster cylinder one from Kevin's website?? Quote Link to comment Share on other sites More sharing options...
_Hex* Posted March 20, 2008 Report Share Posted March 20, 2008 when you say auxillery ports are you reffering to the small ports drilled at an angle at the bottom corners of the intake like in this pict?btw thats a blaster motor so dont worry about it having them on top as well to really get boost ports to work properly you need to weld the side of the cylinder and really open the passage in order to really get fuel/air mixture down faster. from what ive seen i dont think pmr or kt use boost ports. some people have had success some choose not to its all up to everyone own opinion Quote Link to comment Share on other sites More sharing options...
Pasi S. Posted January 3, 2015 Report Share Posted January 3, 2015 I´m a DIY home porter. How large those Boyesen ports should be to work good? (haha) Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 3, 2015 Report Share Posted January 3, 2015 Everybody knocks Jim at passion, but he definitely could make a difference with them. He uses the extra ports in the liner like extra intake window. However a port the size he uses would definitely aid in transfer volume. His stock cyl 12 port once sorted out fucking moves. I did change a couple things, but right now it's nasty. Cubs and his Passion X stuff, not so hot.... Quote Link to comment Share on other sites More sharing options...
Zillaguy Posted January 3, 2015 Report Share Posted January 3, 2015 Post was from 08, someone got the pick axe out on this ine! Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted January 4, 2015 Report Share Posted January 4, 2015 I've been diggin' old shit all day. 1 Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted January 4, 2015 Author Report Share Posted January 4, 2015 That was my first lol I've come a long way lol, that brings back some memories 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.