DreamShee03 Posted June 26, 2006 Report Posted June 26, 2006 Whats up HQ. I was just wandering about cross over tubes on the intake. I have a pair of billet intakes without any crossover tubes or anything and just wanted to know if i would be better getting some intakes with the tube. Thanks a bunch guys. Quote
DUB Posted June 26, 2006 Report Posted June 26, 2006 Whats up HQ. I was just wandering about cross over tubes on the intake. I have a pair of billet intakes without any crossover tubes or anything and just wanted to know if i would be better getting some intakes with the tube. Thanks a bunch guys. go without the tube. I have pro design intakes without the cross over tubes and v-force 3 reeds. It runs awsome! Dave Ripp from Ripps power sports turned me on to the idea. Sadly he passed away last December but if you have anymore questions you should contact Louie Swan at twistercrankshaft.com Quote
BigRed350x Posted June 26, 2006 Report Posted June 26, 2006 My intakes have the cross-over tube built in. You kinda need some sort of crossover tube if you get real technical into the operation of a twin cylinder two stroke, but they will run good with or without one. Quote
[email protected] Posted June 26, 2006 Report Posted June 26, 2006 yeah you need cross over tubes if you get technical . my mechianch saw my silicon seal rig job on my billet intakes and he got all mad at me saying i rig all my shit...... fuck it i had him fix it and convert to alcy. it ran fine without the crossover tube but i guess its needed Quote
hittintrees srh Posted June 26, 2006 Report Posted June 26, 2006 my pro desgin intakes dont have a cross over-my shee freekin ripps it up Quote
jankab Posted June 26, 2006 Report Posted June 26, 2006 Whats up HQ. I was just wandering about cross over tubes on the intake. I have a pair of billet intakes without any crossover tubes or anything and just wanted to know if i would be better getting some intakes with the tube. Thanks a bunch guys. You don't need a crossover tube, my 38 mm intakes don't have them and my 10 mill cub set-up on 39's without a crossover made 125 hp on the dyno Quote
BigRed350x Posted June 26, 2006 Report Posted June 26, 2006 You don't need a crossover tube, my 38 mm intakes don't have them and my 10 mill cub set-up on 39's without a crossover made 125 hp on the dyno Yes your bike will run ok without them, but they are a good thing to have. Any time you have multiple cylinders you should have something to equilize the pressure between the cylinders during operation. Its a good thing to have, but not totally necessisary. Quote
DreamShee03 Posted June 27, 2006 Author Report Posted June 27, 2006 Sweet then, The intakes are trinity or pro design i cant remember but they have no cross over tube. I guess i just wont worry about it and run it. Thanks guys Quote
csrmel Posted June 27, 2006 Report Posted June 27, 2006 im no expert on this but i will speculate that the cross over tube is good for equalising the air flow incase youre carbs are slightly unsynced. i think the tube makes slightly unsynced carbs still work OK in relationship to each other. for racing where you frequently do things like check floats and change jets and such a intake with no tube is probably OK because youre more apt to keeping the carbs in sync compared to a casual rider. Quote
odaen Posted June 27, 2006 Report Posted June 27, 2006 Yes your bike will run ok without them, but they are a good thing to have. Any time you have multiple cylinders you should have something to equilize the pressure between the cylinders during operation. Its a good thing to have, but not totally necessisary. Not 100% sure, but I don't think they equalize pressure between cylinders since they are upstream from the reeds. I think it's the same concept of the boost bottle, where the air/fuel from one carb has a certain amount of inertia built up from when the transfers are open, that whey they close, the crossover allows this mass some place to go as the other cyliders transfers prepare to open a short time later. Quote
Chemical Castration Posted June 28, 2006 Report Posted June 28, 2006 Not 100% sure, but I don't think they equalize pressure between cylinders since they are upstream from the reeds. I think it's the same concept of the boost bottle, where the air/fuel from one carb has a certain amount of inertia built up from when the transfers are open, that whey they close, the crossover allows this mass some place to go as the other cyliders transfers prepare to open a short time later. You're correct. At a certain part of the RPM (depending on the motor and reeds) the draft in the carbs'll be reversed temporarily because the reeds dont shut in time. The crossover tube was designed to store the charge so it wouldn't be pushed back into the carbs (creating a rich condition.) The problem with boost bottles is that they were marketed as a universal magical trinket that would make you go super fast. If properly designed for your configuration, they can help quite a bit. Quote
mouse Posted June 28, 2006 Report Posted June 28, 2006 ive got the k@t intakes and the crossovers are built right inside of them Quote
ThE_BaNsHeE_mAn88 Posted June 28, 2006 Report Posted June 28, 2006 im haveing a prblem were my left cylinder wont run at an idle but once you get the rpms up is runs good. could the crossover tube be cloged and just make the left side foold? Quote
blueshee03 Posted June 28, 2006 Report Posted June 28, 2006 im haveing a prblem were my left cylinder wont run at an idle but once you get the rpms up is runs good. could the crossover tube be cloged and just make the left side foold? doubt it,sounds like your carbs aint in sync maybe. Quote
odaen Posted June 28, 2006 Report Posted June 28, 2006 doubt it,sounds like your carbs aint in sync maybe. could be a clogged pilot as well. Quote
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