240zip Posted October 7, 2010 Share Posted October 7, 2010 I was looking at an intake for my triple DCOE set-up and noticed it had no balance tube (this one is a spare). Instead of a balance tube someone put in air fittings on each runner and created an odd set-up with hoses attached to a tube that sits on top. It seems it originally came with no balance tube. Under what circumstances (i.e. racing?) would you run a set of triple Webers without a balance tube? Are there any advantages to no having a balance tube? Quote Link to comment Share on other sites More sharing options...
josh817 Posted October 7, 2010 Share Posted October 7, 2010 (edited) I think its for those who run no vacuum advance or brake booster, so that would be for racing. Now that I'm thinking about it. The whole point of Weber's, Mikuni's, Solex's, etc is that you want each intake pulse to be separate from one another so its a defined pulse down the runner rather than a big mix up of pulses in one collector. This would allow you to tune for... better efficiency? Whats the term the EFI guys use, volumetric efficiency I think. Anyway, a balance pipe seems like it would make the individual pulses of vacuum distributed throughout the manifold... Seems like it would defeat the purpose. I have a balance pipe, now I'm upset. The balance pipe helps for equalizing the vacuum so for those who are using the brake booster, vacuum advance, or as I just recently discussed with Braap a MAP sensor, it will work properly when using a radical cam that would cause vacuum problems when its not "in cam". Have you ever heard V8 dudes putting in huge cams and all of a sudden their brakes aren't so great and the ignition timing is kind of funky. The larger cam kills vacuum and if you are only pulling from a single runner (single cylinder) for your brake booster then it won't work as well which is why you use a balance pipe or a vacuum reservoir. You know, the whole variable compression thing. Radical cams with long duration will have a lower compression at lower RPM's due to the timing events between valves and pistons. As the RPM's come up and it the cam kicks in (THATS MUH VTEC BABY) the compression rises and the intake pulses become more defined. Hey, I typed a lot. Sorry. Edited October 7, 2010 by josh817 Quote Link to comment Share on other sites More sharing options...
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