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MG TD TF 1500 - Info on carbs synchro gaget

Not sure of the "official" name, if there is such, so I attached a photo of what I'm looking for. Does anyone know where I can purchase, or possibly borrow, this carb airflow synchronizing tool? Neither Moss nor Abingdon Spares list such, and the SU website doesn't refer to it either.

Additionally, is this the best tool for the purpose? I'm assuming it has to be better than the "ear and tube" technique.

As always, appreciate any help anyone can provide -- John

John Brickell

I've got one John.. pretty basic but very functional. Supprised Moss doesn't have any. When I was young and my hearing was good I could do just as good a job with a piece of hose and my ear. Not so much now. There are other variaties out there but usually a lot more expensive. I'm gonna take my stuff over to a locals place later this week and tune his Bugeye for him.
LaVerne

Forgot...the name brand of the tool is Unisyn. Not sure about the spelling.
LaVerne

Found one here if you really want to buy one. Get some local guys to share the cost. Use it once and then it will be in the box for years unless you like screwing with the carbs.

http://www.jegs.com/p/Edelbrock/Edelbrock-Uni-Syn/743621/10002/-1
LaVerne

Thanks LaVerne. I owe you another (at least one) OSH. I have contacted the site you posted and ordered the Uni-Syn. $25.99 and in stock. Arrives on Friday.

Also, read your very good news on Facebook.

Cheers -- John
John Brickell

Moss is still selling them, 386-200, $33.95. I'd suggest trying to locate an original Unisyn, if at all possible. The tool has been around for a very long time. I bought my first one in the 50's. Bud
Bud Krueger

Thanks Bud, and I swear I looked at the Moss catalog and didn't see it. As posted above I did purchase a Unisyn from the site LaVerne suggested.

John
John Brickell

John,

That's not the one you want. It will work, but it's a challenge to get a good reading. I have one that I can bring down for us to use to set up your carbs. When I do, I can get you the brand name. I got mine through Autosport up in Seattle, but I'm certain you can get one online and shipped to you.

Hang on to your receipt and don't use it. I've used both, and this one I have is MUCH better.

Alex
Alex Waugh

Thanks Alex, and will do as you suggest. See you soon -- John
John Brickell

The brand is a Synchrometer and is often refered to as the "snail type carb sync meter". In some cases (TF's) special elbo's are needed to use it, but it's way worth it. They sall factory elbos that go in place of the rubber tip that's on the end (see picture), but the ones I have were made out of PVC parts machined to fit inside the carb throats so I can swap the meter back and forth. After using both the unisyn and this synchrometer, I find this one to be MUCH better.

Alex

Alex Waugh

Sorry -- that's not what you want either. The best tool for the job (IMO) is the "SU Toolkit" (item B in this photo from Moss). Unlike the other two, this one allows you instantly to compare the airflow at all throttle settings, and also to more easily set the fuel mixture.

Rob Edwards

Alex,

Would you please post a picture of the PVC adapter that you had made.

Thanks,
Jim
James Neel

See http://www.ttalk.info/picture_this.htm#Synchrometer%20Adapters Bud
Bud Krueger

When you get to the 'Picture This' page, just scan down and click on the Synchrometer link. Bud
Bud Krueger

Quote

**Unlike the other two, this one allows you instantly to compare the airflow at all throttle settings, and also to more easily set the fuel mixture. **

Instructions here http://www.mgaroadster.co.uk/SU_Carburettor_Tool/SU%20Carburetor%20Tool.pdf

Geoff E

Rob,

Yes, that tool is a good one. The style I posted does allow for very high air flow volumes and thus well over idle. I also like that I'm measuring airflow not just piston height. They should be the same but I can imagine finding out the hard way they are not.

Bud Krueger's photo link is where I got my dimensions from. They work great.
Alex Waugh

The piston height /must/ be the same between carbs at every airflow level. If the piston heights are different between carbs at the same airflow then you have more serious problems. At a particular airflow, the pistons should be at the same height. If they're not, then the carbs will be at different stations on the needles and so you'll have different fuel mixtures in each carb. In other words, the carbs should be matched before syncing otherwise syncing is meaningless. (The first way to test the matching of the dashpots/pistons is to perform the drop test as described in the manual.)

In addition, with the synchrometer or unisyn you have to move the tool back & forth to compare. With the SU toolkit, you just open the throttle. If the carbs are matched, the pistons will rise at the same rate -- i.e. the pointers will be aligned at all throttle openings. If they don't, then the carbs aren't matched and can't be synced. The SU toolkit makes this dead simple to spot.
Rob Edwards

Well said, Rob.

BTW, the source of the Synchrometer adapter on Ttalk is our frequent contributor, John Progess. Bud
Bud Krueger

This thread was discussed between 20/09/2011 and 22/09/2011

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