aleyesonme Posted August 14, 2013 Report Share Posted August 14, 2013 ive searched and have not came across an answer, so here goes. Was curious why do some boots have the holes for a crossover and some boots dont? and if the crossover is not needed why are some boots made for them? just curious, thanks Quote Link to comment Share on other sites More sharing options...
toytech Posted August 14, 2013 Report Share Posted August 14, 2013 Some aluminum intakes have the crossover built in. Some guys dont run any crossover. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted August 14, 2013 Report Share Posted August 14, 2013 The crossover adds to crankcase volume. That could be good or bad, depending on the motor and application. It seems like the crossover would be a good idea to me, but we don't run them on drag motors. Most people don't. Maybe they are better for on and off throttle, rather than WOT. Quote Link to comment Share on other sites More sharing options...
aleyesonme Posted August 15, 2013 Author Report Share Posted August 15, 2013 Some aluminum intakes have the crossover built in. Some guys dont run any crossover. that i understand but if some guys dont run it then whats the pros of running one. and i see jmadd says it adds to crankcase volume, what are the pros and cons to that? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted August 15, 2013 Report Share Posted August 15, 2013 I think on the crankcase volume, the less the better because you get more velocity from the air/fuel mix for drag racing. Not sure about mx or trail riding. Tim at Titan Racing who is a two stroke genius had a whole discussion on it on Planet Sand. That being said, most probably don't know or try to check their crankcase volume. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted August 15, 2013 Report Share Posted August 15, 2013 Wouldnt the intake have to be on the other side of the reeds in order to add to crank case volume? I just figured it helped ballance each side out when idling and cruzing at low speeds. Quote Link to comment Share on other sites More sharing options...
J-Madd Posted August 15, 2013 Report Share Posted August 15, 2013 Yea. It's behind the reeds. I wasn't thinking about that. Sorry for the misinformation. Quote Link to comment Share on other sites More sharing options...
aleyesonme Posted August 15, 2013 Author Report Share Posted August 15, 2013 Wouldnt the intake have to be on the other side of the reeds in order to add to crank case volume? I just figured it helped ballance each side out when idling and cruzing at low speeds. Hmmm, well bikes that don't run em idle and run well at low speeds as well. Wonder what yamaha was thinking when they made this feature.....with no for sure answer guesss I'm back at square one. Thanks for the help tho guys. Anyone else with some more clarity? Quote Link to comment Share on other sites More sharing options...
aleyesonme Posted August 15, 2013 Author Report Share Posted August 15, 2013 (edited) One therory is it is to help keep fuel from escape the engine before the reeds close. It uses the incoming force of the opposite intake, the crossover tube transfers it to the other side to try to force any outcoming fuel back into the engine. It works on similar principle as a boost bottle. Oh ok think that's a lil better explanation......so are u saying that intakes built for a crossover is a better way to go? Edited August 15, 2013 by aleyesonme Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted August 16, 2013 Report Share Posted August 16, 2013 I just installed chariot reed cages and chariot's non cross-over billet intakes. I tuned them, sync'd them and I can't tell the difference. Thing flat out rips with no low speed, mid speed or high speed issues at all. Going to install chariot's billet timing plate and advance the timing to +4* tomorrow morning. Quote Link to comment Share on other sites More sharing options...
aleyesonme Posted August 17, 2013 Author Report Share Posted August 17, 2013 I just installed chariot reed cages and chariot's non cross-over billet intakes. I tuned them, sync'd them and I can't tell the difference. Thing flat out rips with no low speed, mid speed or high speed issues at all. Going to install chariot's billet timing plate and advance the timing to +4* tomorrow morning. yeah thats what im getting at. seems to act the same with or without one. just dont know the politically correct reason Quote Link to comment Share on other sites More sharing options...
Strm Trpr Posted August 18, 2013 Report Share Posted August 18, 2013 +4* on the plate made it even crisper with more power throughout the rev range. One thing is, the stock cylinders are lacking in top end. As far as stock intake w/cross-over tube to non cross-over billet intakes, I can't tell any difference whatsoever. Quote Link to comment Share on other sites More sharing options...
camatv Posted August 19, 2013 Report Share Posted August 19, 2013 the only reason the banshee has it is because of a factory yamaha racer demanded it on a dirt back way back in the 80's the "boost bottle" was his thing. the 3 wheeler had it and the banshee and a bunch of dirt bikes. a few years after that the factory ditched it on the dirt bikes and that was the end of that. welll because they didnt want to retool for the good ole money making bitch that was banshee they just left it on there. no other 2 stroke has a "crossover tube " that i know of. to make it simple more crankcase volume hurts performance, but can lessen the pipe "hit" now back in the 80's pipe hit was super violent making it hard to control some dirt bikes. of course they came a very long ways in that regards and lessening crank volume didnt stick.. so before everyone goes runnign out to the garage to measure their crank volume modern 2 strokes have pretty minimal crank volume issues. most dirtbikes even end up with stuffed cases and crank stuffers to lessen it even more.. that helps keep the fuel/air moving and going into the transfers where it belongs.. just my view on it. the "intakes" that have the tube are just asking for air leaks. most DO leak eventually ( sometimes right out of the box WTF) and are total crap as far as i'm concerned Quote Link to comment Share on other sites More sharing options...
BeeCanBanshee Posted August 19, 2013 Report Share Posted August 19, 2013 I noticed gas coming out of the crossover tube the other day on my bike.... So what your saying is its ok to go ahead and by intakes with no crossover and I'm ok? Quote Link to comment Share on other sites More sharing options...
Nightmare Posted August 19, 2013 Report Share Posted August 19, 2013 I noticed gas coming out of the crossover tube the other day on my bike.... So what your saying is its ok to go ahead and by intakes with no crossover and I'm ok? Yup Sent from my SGH-T679 using Tapatalk 2 Quote Link to comment Share on other sites More sharing options...
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