The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: montmil on May 10, 2009, 07:09:11 PM

Title: Cheap, effective manometer
Post by: montmil on May 10, 2009, 07:09:11 PM

This DIY manometer was copied from an idea from the Power Parachutes company as a simple method to confirm Bing carb synchronization prior to flight. Some ultralight flyers mount the tubing to the airframe and do away with the yardstick.

All I had to buy was twelve feet of 3/16' ID vinyl tubing. Everything else was in the shop.

The fluid is BMW brand 7.5 wt. fork oil. The purple color is a bonus as it's easy to see. I figure that makes the stick an official BMW tool. Add enough oil to have about 12-inches in the tubing. Attach each open end to the vacuum ports on the bottom of both Bing carbs. Support the stick in a vertical position and you're ready to "simonize" those carbs.

(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fi196.photobucket.com%2Falbums%2Faa1%2Fmontmil%2FBMW%2520R65%2FManometer.jpg&hash=8522a9cf7969f12aeefa76eb867c8e7d16126741)

Title: Re: Cheap, effective manometer
Post by: Justin B. on May 10, 2009, 07:32:33 PM

What you have done is re-invented the $2 carb synchronizer!  I'm gonna have to break down and build one since my dual vacuum gauge brainstorm flopped...

Title: Re: Cheap, effective manometer
Post by: montmil on May 11, 2009, 05:42:28 AM

...then shop the Big Box stores. I paid $0.23/foot for the tubing at Ace BMW Supply & Hardware. So my two-buck manometer cost me a bit more. They do work quite well.   Monte

Title: Re: Cheap, effective manometer
Post by: beemer on May 11, 2009, 06:40:40 AM

It's a great item to make!!!here's mine,made it about a year ago.
(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fi77.photobucket.com%2Falbums%2Fj49%2Fmazan_2006%2FDSCF0492.jpg&hash=afdd898c0b767295c31bb38f128de4248ce2d599)

Title: Re: Cheap, effective manometer
Post by: Justin B. on May 11, 2009, 09:25:22 AM

Even when inflation (since the original) is taken into account you came out well!

Title: Re: Cheap, effective manometer
Post by: MrRiden on May 11, 2009, 09:57:50 AM

One of my favorite tools! Here's my fancy schmancy version


(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fi101.photobucket.com%2Falbums%2Fm70%2Fmrridden%2FP1010007.jpg&hash=1607da2b17ecd7b275537984e6e6cd820477b417)

Title: Re: Cheap, effective manometer
Post by: nhmaf on May 11, 2009, 11:25:55 AM

Hopefully there aren't any NY troopers here to notice your "borrowed" New York state highway sign !
 ;)

Title: Re: Cheap, effective manometer
Post by: Justin B. on May 11, 2009, 11:30:02 AM

I was thinking along similar lines in that they are probably glad he lives somewhere else!

Title: Re: Cheap, effective manometer
Post by: MrRiden on May 11, 2009, 03:28:50 PM

Sign is from the 30's, design long ago rendered obsolete. Did I mention it fell off a truck. ;) Every NE transplant that walks by while the bay door is up stops and chats when they see it. Now I want a California Rt 1 sign to go with it. Back to manometers, here is a different take on a differential manometer

(https://bmwr65.org/smf/proxy.php?request=http%3A%2F%2Fi101.photobucket.com%2Falbums%2Fm70%2Fmrridden%2FBaby_bottles.jpg&hash=761958760fda3c425671bf95e3b5e551c1464fa2)

Title: Re: Cheap, effective manometer
Post by: Lucky_Lou on May 11, 2009, 04:36:04 PM

whats the best way to attach it to the carbs??
Lou

Title: Re: Cheap, effective manometer
Post by: Bob_Roller on May 11, 2009, 04:57:17 PM

There is a barbed fitting on the bottom of each carb, that you attach the hoses to.

Title: Re: Cheap, effective manometer
Post by: montmil on May 11, 2009, 05:46:56 PM

Look for a closed-end rubber tube about 20mm long on the bottom of the carb body. Or, you may have a screw in the vacuum take-off tube, same location. FYI, It's an odd thread so don't lose it.

Using the DIY el cheapo grande manometer, both carbs should be hooked up during the synchronization operations.

Monte

Title: Re: Cheap, effective manometer
Post by: MrRiden on May 11, 2009, 06:33:56 PM

Quote

whats the best way to attach it to the carbs??
Lou

Only one way. Connect both ends before starting!! hook 'em up here

http://www.webbikeworld.com/Motorcycle-technical-articles/pulse-air/vacuum-takeoff.jpg

Title: Re: Cheap, effective manometer
Post by: Justin B. on May 12, 2009, 01:10:59 AM

Rich, looks like some new-fangled still design!  ;D