64xracer Posted December 1, 2004 Report Posted December 1, 2004 I have decided to build my own billet intakes, and after a picture search of various websites, I have seen some intakes that use a balance tube or boost bottle, and some that are just two seperate intakes with nothing connecting the two. What would be wrong with not running one at all?? I had a thought that running the tube would give you a better bottom end, and act the same as not having one in the upper rpms. Just a thought of mine, could be wrong. Quote
Sandologist Posted December 1, 2004 Report Posted December 1, 2004 Purpose may be minimal but a purpose nontheless. Quote
fixitrod Posted December 1, 2004 Report Posted December 1, 2004 My intakes don't have the tube. I can't tell you what it does or doesn't do. I've read explanations on the toomey page and one that I believe holyman posted a long time ago. Quote
Banchetta Posted December 2, 2004 Report Posted December 2, 2004 I did a dyno a while back w/ no top end differences but the boost bottle actually created a slight dip when you first whack the throttle. so I left them out. Now I have a stroker w/ intakes and a bottle. I'm thinking of blocking the bottle off.. Quote
Sandologist Posted December 2, 2004 Report Posted December 2, 2004 I did a dyno a while back w/ no top end differences but the boost bottle actually created a slight dip when you first whack the throttle. so I left them out. Now I have a stroker w/ intakes and a bottle. I'm thinking of blocking the bottle off.. 287562[/snapback] I don't think you would ever see a difference on the dyno because the variations in the accuracy are more than the boost bottle would show. Though it is suppose to crispen throttle response by creating a greater volume of air to draw fron as a negative pressure is placed inside the bottle. Quote
Banchetta Posted December 4, 2004 Report Posted December 4, 2004 (edited) I did a dyno a while back w/ no top end differences but the boost bottle actually created a slight dip Edited December 4, 2004 by Banchetta Quote
RNBRAD Posted December 4, 2004 Report Posted December 4, 2004 Well the theory of the balance tube has to do with sound wave propagation and frequency. Obviously Yamaha thought it was important at one time through there R&D. I don't think this theory was tested on our machines with all these aftermarket goodies, ported and polished cylinders, big bores, long rod cranks, larger carbs, aftermarket filters, etc. I'm sure these modifications would change the sound wave frequency in the intake tract. So can we really assume that a balance tube or even a boost bottle should make an improvement on anything other than a stock machine that it was R&D'd for? Who knows, if it works for you, use it, if it doesn't then see The Rail's thread on "best use for a boost bottle" . P.S. Looks like the spacers crispened the throttle response up a bit, at a cost though. Quote
Banchetta Posted December 4, 2004 Report Posted December 4, 2004 (edited) Well the theory of the balance tube has to do with sound wave propagation and frequency. Obviously Yamaha thought it was important at one time through there R&D. I don't think this theory was tested on our machines with all these aftermarket goodies, ported and polished cylinders, big bores, long rod cranks, larger carbs, aftermarket filters, etc. I'm sure these modifications would change the sound wave frequency in the intake tract. So can we really assume that a balance tube or even a boost bottle should make an improvement on anything other than a stock machine that it was R&D'd for? Who knows, if it works for you, use it, if it doesn't then see The Rail's thread on "best use for a boost bottle" . P.S. Looks like the spacers crispened the throttle response up a bit, at a cost though. 288691[/snapback] It did seem to crispen the initial hit of the throttle, but created a dip before powerband, so yes, there is a give and take on that....I spend over 8 hours one day on a dyno comparing all these little mods. .5 hp here, 2hp there, another 1 hp there, etc. here were the results from before I went in and after I left. Now this is w/ my setup, since the stroker, I've found different mods can really shine w/ different setups, so that is a really good point Rnbrad. Note: that ported stock cages did absolutely nothing and boost bottle was removed in the 2nd run also..this was w/ the mods listed in my sig.. Edited December 4, 2004 by Banchetta Quote
Ducman Posted December 6, 2004 Report Posted December 6, 2004 Just my $0.02, if it is going to be difficult for you to add the balance tube in your design, don't do it. If its easy, do it. If your going for top end, don't do it. If your going for a lot of bottom and mid, do it. The 2 piece prodesign intakes I have don't have one, I ordered them without it. Quote
superchicken Posted December 7, 2004 Report Posted December 7, 2004 this is a little off topic but i noticed in the first dyno run that the reed spacers did give a larger and smoother torque curve in the lower rpms.what size spacers did you run if you can remember?im thinking of trying a set,but not convinced on them just yet.any thoughts on them? Quote
Banchetta Posted December 7, 2004 Report Posted December 7, 2004 The very beginning of a dyno run is unaccurate. From the time I hit the throttle and they start reading the dyno, the first 1000 rpms always has that jump up in hp, so I'm assuming that the first 1000 or so rpms might not be accurate. W/ the spacers (seat of the pants feel) will make the shee more tire breaking loose power, w/o them makes the shee smoother. Hard to tell if I liked them, I like smoother power, so I left them out. I have a set if your interested. $10+ shipping. Quote
RNBRAD Posted December 7, 2004 Report Posted December 7, 2004 What about placing the spacers behind the reeds and doing a dyno? May even smooth out the power more. Just a thought. Good posts btw on the dyno runs. Quote
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