SonOfSand Posted March 26, 2011 Report Posted March 26, 2011 Hey guys, I think these are small bore, just wanted to ask someone that knows. Thanks. Quote
Boston Posted March 26, 2011 Report Posted March 26, 2011 kinda hard to tell from that pic. does the it neck down at all where the flange is welded or just the same diamater? Quote
pabansheematt Posted March 26, 2011 Report Posted March 26, 2011 They look like small bore to me. Quote
SonOfSand Posted March 26, 2011 Author Report Posted March 26, 2011 kinda hard to tell from that pic. does the it neck down at all where the flange is welded or just the same diamater? If I am understanding you correctly, yes. Did you click on the picture to enlarge it? Quote
crazycanuck Posted March 26, 2011 Report Posted March 26, 2011 (edited) Im pretty sure those are small bore. Here is a Picture of Big bores, notice the step in the flange area? Edited March 26, 2011 by crazycanuck Quote
SonOfSand Posted March 26, 2011 Author Report Posted March 26, 2011 Thanks for confirmation guys. I'm putting them on a HJR 10 mil cub, does anyone know if there is something to be gained by going to big bores? Quote
crazycanuck Posted March 27, 2011 Report Posted March 27, 2011 Thanks for confirmation guys. I'm putting them on a HJR 10 mil cub, does anyone know if there is something to be gained by going to big bores? did you pick up a 10mm????? Quote
SonOfSand Posted March 27, 2011 Author Report Posted March 27, 2011 did you pick up a 10mm????? I wish! No, just helping a friend do a new build in my garage, he bought the pipes used, and the guy told him they were BB. I will probably need a 10 mil to best you though. LOL Quote
camatv Posted March 27, 2011 Report Posted March 27, 2011 those are small bores the flange to pipe is nearly the same on BB most people think that just cause the pipe dia is BIG makes thema BIG BORE pipe and they are sold that way. small bores will REV and the BB's will make more TQ on the 10's i personally like the added TQ them larger motors dont really like to rev to 13K anyways. Quote
SonOfSand Posted March 28, 2011 Author Report Posted March 28, 2011 those are small bores the flange to pipe is nearly the same on BB most people think that just cause the pipe dia is BIG makes thema BIG BORE pipe and they are sold that way. small bores will REV and the BB's will make more TQ on the 10's i personally like the added TQ them larger motors dont really like to rev to 13K anyways. Is it a significant amount of TQ? Thanks Cam. Quote
ban565 Posted March 28, 2011 Report Posted March 28, 2011 I believe that the inside diameter of the sm bore is 7/8 in the big bore is one inch . Quote
RadarRacing Posted March 28, 2011 Report Posted March 28, 2011 On the other end of the pipe there is a difference. The smallbores taper down to the stinger before they really curve in towards the middle of the bike, the bigbores curve in towards each other and actually are fat still just under and inside the top frame tube. Mine actually crowd my lectrons but my 4mil likes bigbores. Quote
J-Madd Posted March 30, 2011 Report Posted March 30, 2011 For what its worth, I dynoed BB OOF vs SB OOF on my 10 mil Cub. They made the same HP, but the BB made it sooner in the rpm range, and that means more TQ. NO difference in times at the track with them, using the same tires/gearing/jetting on both. YOur results may vary. Quote
SonOfSand Posted March 31, 2011 Author Report Posted March 31, 2011 For what its worth, I dynoed BB OOF vs SB OOF on my 10 mil Cub. They made the same HP, but the BB made it sooner in the rpm range, and that means more TQ. NO difference in times at the track with them, using the same tires/gearing/jetting on both. YOur results may vary. Good to know, thanks. Quote
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