Topic: How to sync your own sync gauges?

[Dos]

Hi everyone,

I noticed that even when I synced my carbs they still sounded like crap.
I read that sometimes when you buy carb sync gauges they may not all be set at the same spec.

How do you sync all your gauges to be the same with your dampers. I feel this is tricky. Even when I get all gauges to be at the same spot when I rev and hold down they seem to change. I test on one cylinder and then switch out the house for each gauge

[TwoTired]

Supply a common vacuum source to all the gauges at the same time.  Aquarium supply places offer manifolds for one in and four out distribution.

Cheers,

[DaveBarbier]

You definitely do have to calibrate all gauges. You’re doing it right, connecting all gauges one at a time to the same cylinder.

I have the needle vacuum gauge ones, not the fluid in a tube ones. I feel better using them than when I used the blue fluid type. Those seemed to be more erratic. Maybe too sensitive?

Assuming all maintenance operations are completed correctly and the carbs have a decent bench sync and you have no air leaks, they should be fairly steady and syncing shouldn’t take more than 5 minutes.

[DaveBarbier]

Ok, TT and I said competing procedures. I’ve heard to connect the gauges one at a time instead of all at once. TT has much more experience syncing than I do though.

[TwoTired]

Ok, TT and I said competing procedures. I’ve heard to connect the gauges one at a time instead of all at once. TT has much more experience syncing than I do though.

Both methods work if your memory is good.  But, if all gauges get the same source, they better read the same.  I use a little Mity Vac hand pump for calibration. ... Cause I have one...

Cheers,

[Dos]

Yeah I’m doing one cylinder one at a time.

Is it me or is it very easy to get inaccurate results. Does it matter if the dampened are at different specs? Just as long as the needles are in the same spot right?

[TwoTired]

The dampers are able to shut off the vacuum entirely.  This is why I use a common source and manifold.  A closed damper won't allow the gauge to read.
I've also used the manifold to connect to a common cylinder.  Then adjusted the dampers so all the gauges react in the same way with the same excursions.

Cheers,

[rotortiller]

Calibrate (match) at operating values.

[flybox1]

^^^ those gauges are a breeze to sync.

Calibrating one at a time to Cyl 1 is what I usually do.
Its more important that your (calibrated) gauge needles all point to the same spot on every dial.....unless you get no vac reading at all

[evanphi]

^^^ those gauges are a breeze to sync.

Calibrating one at a time to Cyl 1 is what I usually do.
Its more important that your (calibrated) gauge needles all point to the same spot on every dial.....unless you get no vac reading at all

+1. I have the same gauges and I hook them one-by-one to the same cylinder to make sure they are all reading the same. Then I hook them up to their individual cylinders and adjust the carbs.

[dave500]

I hook all four at once to the vacuum advance port on my car,nice strong steady vacuum.

[Dos]

I have the same set ^
I guess what I’m asking is, since I can adjust the dampeners individually wouldn’t that make it inaccurate? Like how can I set the dampening to be the same on all of them so when I adjust them the needles are in the sample place?

[dave500]

the damper is a damper,it just stops the needles going hay wire,you adjust the damping enough to allow the needles to still move not cut off the vacuum fully.

[TwoTired]

I have the same set ^
I guess what I’m asking is, since I can adjust the dampeners individually wouldn’t that make it inaccurate? Like how can I set the dampening to be the same on all of them so when I adjust them the needles are in the sample place?

By adjusting them to a common source at the same time, as I explained earlier.  Besides you adjust for equal at muddle of the needle excursion, rather than using peaks and minimums.

[evanphi]

I have the same set ^
I guess what I’m asking is, since I can adjust the dampeners individually wouldn’t that make it inaccurate? Like how can I set the dampening to be the same on all of them so when I adjust them the needles are in the sample place?

You take the covers off the gauges and adjust the needle position with the little brass screw. Set the dampers so the needles barely move.