banshee0509 Posted September 26, 2006 Report Share Posted September 26, 2006 I have a question on those boyesen ports that alot of people ha drllied in thier intakes, Will theywork on a drag ported stock 350 with t5s,with ed 190* transfers 124* +6 timing. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted September 26, 2006 Report Share Posted September 26, 2006 What boysen ports are you referring to? Do you have a link or a picture?? Quote Link to comment Share on other sites More sharing options...
ohiobanshee Posted September 27, 2006 Report Share Posted September 27, 2006 I think he is talking about boost ports drilled from the intake port into the transfer ports on each side. Quote Link to comment Share on other sites More sharing options...
2003LimitedBanshee Posted September 27, 2006 Report Share Posted September 27, 2006 I think he is talking about boost ports drilled from the intake port into the transfer ports on each side. Yep I'm sure that must be what he is talking about. Back when boost ports first came about, some of the first to start doing this with any noteriety was Boyesen. Or so legend has it. To answer your question, banshee0509, boost ports are used in conjuction with drag style porting by many users. However, and I'm not claiming to be a builder, I don't know that those durations etc you were mentioning would be generally classified as a drag port. Also, since I got the impression you are considering porting your own bike, I don't know that this is something I would try first shot out of the hole. Although, you do have to start somewhere. I'm not planning on adding boost ports to my cylinders when I port them in a few weeks, but that is just me. Did you read the link over at PS? Any response on your transfer angle post on PS? Quote Link to comment Share on other sites More sharing options...
lowriderb Posted September 27, 2006 Report Share Posted September 27, 2006 with the stock cylinders i wouldnt do it.. to make the boost ports big enough to be worth while you will run the risk of cracking the ears off the cylinders.. imo i wouldnt cut them into the stock cylinders... also drag ported with 190* exhaust duration? that doesnt sound right.. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted September 27, 2006 Report Share Posted September 27, 2006 Ahh...that's what I thought, just wanted to be sure we're on the same page. I haven't heard 'em called Boysen ports before, just boost ports. Jim at Passion does this, called the Passion 12 port I think, but...he Tig welds extra material there. Quote Link to comment Share on other sites More sharing options...
2003LimitedBanshee Posted September 27, 2006 Report Share Posted September 27, 2006 Ahh...that's what I thought, just wanted to be sure we're on the same page. I haven't heard 'em called Boysen ports before, just boost ports. Jim at Passion does this, called the Passion 12 port I think, but...he Tig welds extra material there. Bingo (and credit to lowriderb too). I understand that you are left will very little cylinder material left, and without additional welding it would certainly crack. Believe some still crack after being welded anyway... Quote Link to comment Share on other sites More sharing options...
banshee0509 Posted September 27, 2006 Author Report Share Posted September 27, 2006 Thanks guys im just trying to get opinions before i start grinding . Ive been porting and polishing Molding Dies for over six years and want to give these two strokes a try like somebody said I got to start somewhere right. So if those durations don't sound to good for a drag port what might be a good numbers for a drag port on a stock 350 with t5s.......anybody ......thanks. :baseball_wassat: Quote Link to comment Share on other sites More sharing options...
2003LimitedBanshee Posted September 27, 2006 Report Share Posted September 27, 2006 From what has been passed along to me, I have heard that T5's really don't work well with port timings much above 194* exhaust duration. Again, not claiming to be a builder, just insight/advice passed to me in my search for porting specs. Wise men have said, you can always take more, but you can't add back on. So, keep that in mind when messing with the port timing. If want a more aggressive grind, take it in incriments. Also, as you change parts, for instance pipes, CPI's and the like will accept more ED more willingly. Also, again, PS has seemed to be the place for the technical discussion. I was amazed at the help and specs I was able to mill through with some (reportedly) reputable sources. Quote Link to comment Share on other sites More sharing options...
banshee0509 Posted September 27, 2006 Author Report Share Posted September 27, 2006 thanks limited banshee 2003 for all your help . Yeah i looked at that thread you started man they gave you a gang of info those guys are great .......did you ever port your own motor ,just curious to see how they came out for a first timer got any pics..... thanks.. Quote Link to comment Share on other sites More sharing options...
2003LimitedBanshee Posted September 27, 2006 Report Share Posted September 27, 2006 Two weeks from now. I was going to be porting this month, but I've got a trip planned next weekend (Oct 6th), and rather than risk not getting it done (or rushing it) I decided to put it off until I get back. It will go to the dyno for a baseline the following week, and then tear down, and tear in. After all is done it will go back to the dyno to see what kind of results I was able to pull. I've done all my own tuning, and the bike will be tuned by me before heading to the dyno again, so it will be a true DIY'er. I could not believe how much info they were willing to share, but I hope it pays off. Here is an example of what I am shooting for... Cylinder Pics These were ported by the builder that was forthcoming with all the info. As the discussion followed on PS, notice that the intakes are not huge compared with what many have pics of. I'll keep you updated as my project takes form. Good luck with yours! Quote Link to comment Share on other sites More sharing options...
lowriderb Posted September 27, 2006 Report Share Posted September 27, 2006 for a drag port i would raise a 350 up to around 198* exhaust duration.. 186-188 is around stock.. and the transfers to about 132... Quote Link to comment Share on other sites More sharing options...
banshee0509 Posted September 27, 2006 Author Report Share Posted September 27, 2006 ok keep me posted to see how they performed "2003" thanks! :beer: Im' aming for something a liitle like this. Quote Link to comment Share on other sites More sharing options...
alcoholbanshee Posted September 27, 2006 Report Share Posted September 27, 2006 for a drag port i would raise a 350 up to around 198* exhaust duration.. 186-188 is around stock.. and the transfers to about 132... That would be a good start.......I like the exhaust a little higher but no higher than 200*. Boost ports do work but welding is a must!!!!!! 1 Quote Link to comment Share on other sites More sharing options...
lowriderb Posted September 28, 2006 Report Share Posted September 28, 2006 That would be a good start.......I like the exhaust a little higher but no higher than 200*. Boost ports do work but welding is a must!!!!!! the boost ports in the banshee's would not be big enough to flow enough to be worth the hassle.. they will not be as big as what is built into the cub cylinders.. or what is in the 250R's also for the cost of possibly ripping the ear off of the cylinder i wouldnt waste my time with them.. even if it were welded.. when it rips it will be across the base of the cylinder and through the primary transfers.. pretty much ruining the cylinders. then again both of the motors that ive seen this happen to were 95-109hp motors.. Quote Link to comment Share on other sites More sharing options...
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