SU carb tuning - anyone have a vacuum gauge?

[rallycross]

This is a bit of a long shot but does anyone have a Vacuum gauge we could borrow next week for tuning a triple SU carb set up?

My trusted mechanic knows how to set these up but has long since lost his vacuum gauges after a garage fire in the 90's (hopefully the fire was nothing to do with his carb' tuning activities I probably should ask him about that!)

We are trying to fine tune a 6 cylinder Jag running triple SU carbs next week.

Any help much appreciated - its not the sort of thing you can buy from EuroCarParts.

[glenrobbo]

Just use a length of rubber tube as a stethoscope to compare each carburettor inlet flow rate - it's surprisingly accurate.

Or construct a manometer using a U-tube of transparent plastic tubing containing a bit of dyed water, fastened to a graduated backboard. It's not rocket surgery.

[Rubin215]

Ask at your local motorbike shop; bikes are still generally multiple carbs or multiple throttle bodies.
Cheap vacuum gauges are less than £50 online, but most decent workshops will have a digital set which they will lend out for a large credit-card deposit and a case of beer.

[littleredrooster]

Yup, got some. Where are you?

Edit: just spotted you're in Surrey, so probably a non-starter.

Edited by littleredrooster on Friday 28th October 09:47

[kev b]

It is simple to make a set using aquarium tubing filled with AT fluid stapled to a board, surprisingly accurate.

Quicker than finding a set to borrow, costs less than £5.and you will always have them available

You tube has lots of how to vids. as do various bike forums.

[rallycross]

littleredrooster said:

Yup, got some. Where are you?

Edit: just spotted you're in Surrey, so probably a non-starter.

Edited by littleredrooster on Friday 28th October 09:47

thanks for the offer much appreciated.

[rallycross]

Rubin215 said:

Ask at your local motorbike shop; bikes are still generally multiple carbs or multiple throttle bodies.
Cheap vacuum gauges are less than £50 online, but most decent workshops will have a digital set which they will lend out for a large credit-card deposit and a case of beer.

thanks for this idea will give it a go rather do this than make something up from scratch.

[geeman237]

Or buy one of these https://www.amazon.co.uk/STE-BK-Synchrometer-ITCBK...

I have used one on my Daimler SP250 and helped a friend with his triple SU E-Type. It works well. Make sure you get the right adaptor to fit the carb throat.

[V8 FOU]

Got one - if Tunbridge Wells isn't too far. Bottle of claret is the usual hire rate........

[Rubin215]

http://www.mandp.co.uk/index.php/default/economy-s...

Cheap and cheerful.