digital sync tool
 

I've been seeing some motorcycle mechanics on youtube use this tool and they seem to like it, wondering if it could be useful to us

has anyone tried this already?

https://thedigisync.com/

It looked promising enough to me to send them my money, but I haven’t used it yet. Looks well built and hopefully works as well as claimed.

Looks very interesting. I wonder if/how it would work on Webers or Zenith carbs?

Subscribed.

I bought it to do my PMO ITBs. Because I use the vacuum ports to tell the engine how much fuel to supply, removing the lines to hook up the tool will make my ECU think that there is no vacuum and it won’t run right.

I was thinking that maybe I could use a hand vacuum pump to make the computer think it’s getting a signal and then I can hook up the Digisync to the 6 ports and adjust.

What do you guys think of the plan? If it should work, I could give it a try in the garage soon and report back.

Why not use a t fitting so your ecu can get a real reading

Because all 6 plenums sum together to feed the computer and you would get an average reading of all of them on the tool instead of being able to get them balanced.

It could be possible to leave a couple hooked to the computer, sync the others and then switch and sync the rest; not sure if that would be as accurate though.

The other option, could be to do do a throttle position sensor table instead of vacuum so the engine could run while doing the sync.

It’s been a long time since I owned a car with carbs, so do they have a vacuum port on each cylinder and does it get hooked up to something during operation?

It seems overly complicated but you could split the hose from each throttle body and then send one hose to the device and one to the common plenum to the ECU…

Alternatively, yes switching to TPS for fueling would solve that problem.

Julian,

Wouldn’t that effectively connect all of the vacuum signals together, so you would get the same reading on all bodies even if they were different individually?

I may try my vacuum pump on the MAP and then hook up each port to the tool individually.

I’m about to drop the engine for a cam sensor and new ECU, so doing the test now would really just be to help the community decide if the tool is valuable.

If it works, I can can lend it to you once you get your engine back running.

Rutager

Hmm now that I think about it I think you’re right.

Perhaps just switching to tps for this procedure is best.

maybe look at these
https://raytechautomotive.com/products/synchroking-carb-throttle-body-balancer?variant=39568458186945http://forums.pelicanparts.com/uploa...1765363301.png

PMO Carbs
 

PMO's have an open port (cleaning) that may have the same thread size as their line adapter.

Arrows point to possible ports to screw in the vacuum adapters
http://forums.pelicanparts.com/uploa...1765420670.jpg

Looks interesting.

Good luck,

Manifolds can also be drilled and tapped for fittings

I have this unit for my PMO ITB, works great. Way easier than a single sync tool and more accurate.

Are you running TPS for your fueling tables? If MAP, how do you keep the engine running without the proper vacuum signals?

A while ago I tested the electronic balancer (not digital though) from my BMW motorcycle engine. If you just connect it to the vacuum ports of both banks, you get some average values which are fluctuating quite a bit. Probably can be used for a rough left/right synchronization, but no replacement for a good old airflow tool. Certainly better to connect all 6 throttles, but not sure if it is worth the effort.

http://forums.pelicanparts.com/uploa...1765533614.jpg

TPS only. Have a MAP but not part of the tuning table.

Too Much Tool?
 

What a cool old tool.

I agree - appears a rather involved process for 6 carbs when the flow/synchrometer is considered good enough by most.

I would be interested in monitoring and recording that sort of data while driving though, but again $$$$ vs synchrometer.

We have always relied on the more "classic" syncrometers- with great results. That said, I am interested in the product where we can adapt it, and for the price, it is worth exploring its uses in our shop.

Cheers