Uni-syn

[dimps8]

DAMN......PURCHASED A UNI-SYN SYNCHRONIZER TOOL TO BALANCE MY SOLEX CARBY'S THIS WEEK END. PLACED SYNCHRO TOOL OVER THROATS WITH A GOOD SEAL AND FLOAT DID NOT MOVE. IT ONLY MOVED WHEN I SCREWED IT RIGHT DOWN TO THE MAXIMUM RESTRICTED AIR POSITION, BUT IT ONLY BOBBLED ABOUT ABIT. IDLE WAS ABOUT 1000 RPM. WHAT CAN I BE DOING WRONG??? FEELS LIKE THE UNI-SYN ISN'T SENSITIVE ENOUGH??

[Green 912]

Clean it up put it back in the box and send it back. They will work if you use them just right but there is a much better choice available for a little more money. Get a Synchrometer. The gray plastic unit. Made in Germany, very easy to use, durable, no adjustments needed and very accurate.

[wwwcad]

I think you can get the Synchrometer at www.redlineweber.com if my memory serves me right!

Bill

[Green 912]

Peformance Products has it if Pelican does not. 800 423 3173 P#903 589 $67.95 USD The bobing ball type unit can be used but it is not nearly as accurate and must be used very carefully for it to be any better than just using your ears to set the carbs.

[adot]

Synchometer at Stoddars is $53 part # t80.750.000

Brett

[ron69912t]

I have used my UniSyn for many years and lately on my 69 912 with Solexe's and recently with a Weber conversion. It works OK and is a little crude but it does get you in the ballpark.

I recently ordered a Syncrometer and am waiting for it to arrive, I'll make a comparison test and report on ease of use and accuracy between the two.

You must be sure you are not sucking any air around the bottom seal of the UniSyn. Take off the air cleaner base so you have a good seal on the carb top. if you use some kind of homemade extension tube to raise it over the carb throat be sure to put rubber on the ends to seal the extension tube. You can choke off all the air to the carb when it seals properly.

Good luck
Ron

[Green 912]

I bet you will toss the unisyn in the trash 2 seconds after you try the new one! No ballpark, dead on.

Last year someone on the Potomac website very nicely tried to give one away (it was left over from an old car he no longer had) but had a hard time doing so.

[ron69912t]

I bought my UniSyn in 1969 to adjust the triple carbs on my 1968 911L. As I recall it was a very touchy thing to do.

Ron

[WFBowen]

Unisyns worked best on the British cars where you had half of a big six sucking through a tiny SU. I never had problems with two old Jags, but when I tried it on a 67S I had, I merely had to guess as to what the "bounce window" on the thing was telling me, so I went back to the old rubber hose method, which works if nothing else is available. The POS is probably still at the bottom of the Los Angeles landfill.
A couple additional thoughts on syncing: Make sure you check the sync at midrange revs and, if faced with chosing mid or idle, sync to midrange. Exactly synced carb opening is critical.

[912s]

I've never used a Unisyns but do own a Synchometer that I've used on my car as well as multi-carb motorcycles and snowmobiles. In either case a vacuum leak or improper seating will make the tool inaccurate.

I'm sure people could argue both sides of this and maybe it's because I'm a computer geek by trade, but I like knowing the number that I'm shooting for when moving from carb to carb, not just did that look like it was in the same place as the last one....

Maybe you can borrow one and see which you prefer?

[Rick Becker]

I first purchased a Unisyn, then purchased a Synchometer. On a 912 with a big bore kit, the Unisyn restricts the airflow and the marker in the tube hardly moves.

The Synchometer doesn't restrict the air nearly as much. Worth the extra $ in my view.

[timmy]

I have to agree with Rick, the syncrometer is the best I bought one at Nevada Off road buggy here in Las Vegas for 30.00 out the door , paid for itself, less hassle, easier to read, less hand work I spent 6 hours working on the carbs, [they sat for 2+ years] full of varnish almost like fiberglass in the bowls and air ways the sync saved me back the time I spent on the rebuild.

[dimps8]

I think your right. I rebuilt my solex's yesterday. They were in excellent shape to start with which helps. Installed them, fixed up some sloppy linkages and fired them up. Ran ok, fine tuned idle mixture screws which responded well. Balanced carbs with new unisyn,(works slightly better than last one). I'm going to purchase a synchrometer though, like previous posts said, shooting for numbers is spot on! I road tested the car and she ran great. Idle was smooth, and power came on great. no flat spots.