SLORYDER Posted April 23, 2010 Report Share Posted April 23, 2010 Now I've seen this done on 250 r's , suzuki lt's and sm's, but not really on the banshee. What I would like to try is to drill 2 additional ports from the intake directly into the auziliary rransfers. To me this mod would substantially increase the flow through the transfers and reduce pumping losses.. Now, I know there will be limitations, such as hitting the water jackets and getting the angles right, but I don't see and reason not to try it. I mean let's talk about what effect it would have on things; first and foremost it would reduce the velocity through the transfers, the degree depending on the size of the ports-but would this necessarily be a bad thing if you are shooring for mid-top end hp? I guess getting the angle exactly the same as the secondaries would be difficult to impossible, but what would the effect be of putting them at less of an angle bu 15 or so degrees or so? I have actually seen a pic of banshee jugs with these ports installed, so it looks like it is possible. Thoughts? Quote Link to comment Share on other sites More sharing options...
NVRBanshee Posted April 23, 2010 Report Share Posted April 23, 2010 ive seen it alot down here they call it boost ports i think lol Quote Link to comment Share on other sites More sharing options...
banshee_terror_ Posted April 23, 2010 Report Share Posted April 23, 2010 ive seen it alot down here they call it boost ports i think lol were have u been. alot of cubs and stroked bikes run them. i mean allot. i have them on my 4mill. Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted April 23, 2010 Report Share Posted April 23, 2010 Nothing new here, my passion 12 port has these boost ports (boysean ports) cut in them, and matching holes machiend into the liner, then jim had to tig weld the cylinders at booth rear areas on the outside of the cylinders. Cody Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted April 23, 2010 Report Share Posted April 23, 2010 Heres one of the welds! Cody Quote Link to comment Share on other sites More sharing options...
ECshee Posted April 23, 2010 Report Share Posted April 23, 2010 "worm holes" ??? Quote Link to comment Share on other sites More sharing options...
AKheathen Posted April 23, 2010 Report Share Posted April 23, 2010 "worm holes" "boost ports" "boysen ports" etc, yah it's been done allot, but, as mentioned, welding is needed to make tham of any substantial size. otherwise, you have to be really carefull, and make them of a small diameter Quote Link to comment Share on other sites More sharing options...
wvbansheeboy Posted April 23, 2010 Report Share Posted April 23, 2010 <a href="http://s668.photobucket.com/albums/vv44/becareless06/?action=view¤t=IMG00002-20091217-2106.jpg" target="_blank"><img src="http://i668.photobucket.com/albums/vv44/becareless06/IMG00002-20091217-2106.jpg" border="0" alt="Photobucket"></a> my porting.. smaller boost ports Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted April 23, 2010 Report Share Posted April 23, 2010 link no worky! Quote Link to comment Share on other sites More sharing options...
firebanshee Posted April 24, 2010 Report Share Posted April 24, 2010 You can do it without welding but you have to be REALLY careful.If you weld it you can go ALOT bigger. Quote Link to comment Share on other sites More sharing options...
blowit Posted April 24, 2010 Report Share Posted April 24, 2010 Nothing new here, my passion 12 port has these boost ports (boysean ports) cut in them, and matching holes machiend into the liner, then jim had to tig weld the cylinders at booth rear areas on the outside of the cylinders. Cody Not sure if I agree with creating a port from the aux port to the bore but to each their own. Those cylinder looks really good though. Jim does nice work. Brandon Quote Link to comment Share on other sites More sharing options...
alf44 Posted April 24, 2010 Report Share Posted April 24, 2010 So i was just looking at a set of cylinders I got from someone and there supposed to be drag ported. These boost ports are there and so is the welding. I was wondering what this was all about. So what are the benifits of this and is it a good thing? Do you have to run a certain type of piston? Quote Link to comment Share on other sites More sharing options...
firebanshee Posted April 24, 2010 Report Share Posted April 24, 2010 So i was just looking at a set of cylinders I got from someone and there supposed to be drag ported. These boost ports are there and so is the welding. I was wondering what this was all about. So what are the benifits of this and is it a good thing? Do you have to run a certain type of piston? Those boost ports allow you to have a denser fuel charge.The boost ports do this by allowing the fuel charge to flow through the ports and get drawn down into the crank case before the windows in the piston line up with the intake ports.You do not need special pistons. Quote Link to comment Share on other sites More sharing options...
trickedcarbine Posted April 25, 2010 Report Share Posted April 25, 2010 Worm holes, boost ports, auxillary ports, whatever you call them, they do make a difference. The local shop I work with for my porting shows no gains on a flow bench and no real peak power increases, however when coupled a larger exhaust port there are decent gains to be had over using one with out the other. In testing the real gains are in a more linear or broad power band wich comes on sooner and lasts longer and a noticable throttle response is a huge bonus. 1 Quote Link to comment Share on other sites More sharing options...
papa_smurf49319 Posted April 25, 2010 Report Share Posted April 25, 2010 Not sure if I agree with creating a port from the aux port to the bore but to each their own. Those cylinder looks really good though. Jim does nice work. Brandon Pretty soon you will be gettting a real good look at them lol. Cody 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.