530grafix Posted January 6, 2008 Report Share Posted January 6, 2008 what do you guys think about using a reed spacer for the vaccum line on a pump. reason being I dont really want to drill into my cylinders. also would it really matter if I put the spacer between the reed and the carb since Im only using it for vaccum. Thanks Quote Link to comment Share on other sites More sharing options...
theshee Posted January 6, 2008 Report Share Posted January 6, 2008 Should work fine. I have seen guys drill their billet intakes and it works. Quote Link to comment Share on other sites More sharing options...
530grafix Posted January 6, 2008 Author Report Share Posted January 6, 2008 Should work fine. I have seen guys drill their billet intakes and it works. my concern is that if i go in the side of the spacer will it draw enough since the reed is only about 1/16th" from the spacer or should i go through the top. Thanks Quote Link to comment Share on other sites More sharing options...
theshee Posted January 6, 2008 Report Share Posted January 6, 2008 hmmm... never thought about that. I would think it would still be ok but im not 100% sure. Quote Link to comment Share on other sites More sharing options...
530grafix Posted January 6, 2008 Author Report Share Posted January 6, 2008 hmmm... never thought about that. I would think it would still be ok but im not 100% sure. what about putting the spacer between the carb and the reed instead then there should be plenty of vaccum right? Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted January 6, 2008 Report Share Posted January 6, 2008 what about putting the spacer between the carb and the reed instead then there should be plenty of vaccum right? There is only vaccuum when the motor draws air in if you put it inbetween the carb and reeds. If you put them inbetween the cylinders and reeds there is going to be greater pressure differences and I would emagine the pump would pump better, because the pump would be subjected to neg and pos pressure. The pump really doenst need to have good flow of vaccuum. It just needs pressure changes to force the diaphram back and fourth. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 7, 2008 Report Share Posted January 7, 2008 There is only vaccuum when the motor draws air in if you put it inbetween the carb and reeds. If you put them inbetween the cylinders and reeds there is going to be greater pressure differences and I would emagine the pump would pump better, because the pump would be subjected to neg and pos pressure. The pump really doenst need to have good flow of vaccuum. It just needs pressure changes to force the diaphram back and fourth. Incorrect...on some pumps. My Mikuni DF62 (Octagon high flow pump, 65L per hour) will work on vacuum only... I can't speak of others cause that's the only kind I use. Quote Link to comment Share on other sites More sharing options...
530grafix Posted January 7, 2008 Author Report Share Posted January 7, 2008 here it is, ya think its gonna work? Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 7, 2008 Report Share Posted January 7, 2008 If you have a 4 mil cub, why are you using reed spacers?? If it were me, I'd pull on side off, stuff a rag down the intake, get a shop vac on the inside and drill it from the outside. Between the vacuum and the rag, you'll be fine.... I sure wouldn't trust that...to be honest. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted January 7, 2008 Report Share Posted January 7, 2008 Incorrect...on some pumps.My Mikuni DF62 (Octagon high flow pump, 65L per hour) will work on vacuum only... I can't speak of others cause that's the only kind I use. If your vaccuum line is drilled in to the cylinder then isnt it exposed to neg and pos pressure? I know you dont have to have the pos pressure but I was just figuring it would pump better because it would cause the rubber diaphram to move back and fourth more, pumping more fuel. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted January 7, 2008 Report Share Posted January 7, 2008 here it is, ya think its gonna work? I would grind or cut the excess off the threaded barb flush with the inside of the reed spacer though. Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 7, 2008 Report Share Posted January 7, 2008 If your vaccuum line is drilled in to the cylinder then isnt it exposed to neg and pos pressure? I know you dont have to have the pos pressure but I was just figuring it would pump better because it would cause the rubber diaphram to move back and fourth more, pumping more fuel. You're correct...it is exposed to a pulse (pos and neg pressure). However, it's not necessary.... I'm still curious as to if these are for his 4 mil cub in his cylinder, or another motor... You don't need reed spacers on a cub...that's really my point. Putting them on only to have a fuel pump barb is not a great idea, that's a few more gaskets for an air leak... Quote Link to comment Share on other sites More sharing options...
530grafix Posted January 7, 2008 Author Report Share Posted January 7, 2008 (edited) If you have a 4 mil cub, why are you using reed spacers??If it were me, I'd pull on side off, stuff a rag down the intake, get a shop vac on the inside and drill it from the outside. Between the vacuum and the rag, you'll be fine.... I sure wouldn't trust that...to be honest. iwas trying to avoid drilling the cylinders. Aderaline recomended this. they said its what they do if the customer doesnt want thecylinders drilled..and yeah its for the 4mil cub. Edited January 7, 2008 by 530grafix Quote Link to comment Share on other sites More sharing options...
dajogejr Posted January 7, 2008 Report Share Posted January 7, 2008 Drill the cylinders, much easier and cleaner... You want the reeds as close to the cylinders as you can get them...this is not a trail bike. My 10 mil was done the way I described, we got it all together and totally forgot to drill it for the vacuum barb. Rag, shop vac and a drill. Ran it all season, still going.....no issues with it unless you count the smoked piston due to getting greedy and leaning it out.... Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted January 7, 2008 Report Share Posted January 7, 2008 You're correct...it is exposed to a pulse (pos and neg pressure).However, it's not necessary.... I'm still curious as to if these are for his 4 mil cub in his cylinder, or another motor... You don't need reed spacers on a cub...that's really my point. Putting them on only to have a fuel pump barb is not a great idea, that's a few more gaskets for an air leak... That is all I was saying. If he is going to go the reed spacer route put it inbtween the cylinder and reed because it would have a bigger pressure pulse. Dirlling the cylinder would be the best way to go though. You could always put a threaded pluge in it if you decided you didnt want to run alky any more. Quote Link to comment Share on other sites More sharing options...
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