BK STE Schleyer Synchrometer Carburettor Balancer (High-Flow Airflow Meter) 1–35 kg/h
Product description
What it is and why people buy it
If you’re trying to get multiple carbs or throttle bodies pulling evenly, a sync tool becomes one of those “small thing, big difference” purchases. The BK STE Schleyer Synchrometer is built for carb and throttle body balancing by measuring airflow, rather than relying purely on vacuum gauge feel or rough visual checks.
On paper, it targets airflow ranges of 1–35 kg/h, and it can extend up to 50 kg/h when the high-flow bypass is used. That makes it interesting for tuning that reaches into higher-RPM territory, where a basic meter can be left wanting.
That said, it’s not a universal “any engine will work” miracle tool. It’s designed around intake fitment and airflow measurement, so your setup still needs to match the intended style of connection and the intake size range.
What to know before you buy (fitment and measurement range)
The most practical thing to check is the physical fit. This Synchrometer uses a rubber cone with a stated fitment range of 48–70mm intakes. The description also gives guidance that the rubber cone fits approximately 62–70mm carbs and around 51–67mm intake bores.
In real terms, this is the kind of tool you’ll use by inserting the cone into the intake area (or fitting it to suitable components like ram pipes/velocity stacks depending on your layout) and then comparing readings between cylinders. If your engine’s carb body or intake bore falls outside what the cone range covers, you may find yourself fighting a poor seal—which can make results less trustworthy.
The second key point is the airflow measurement range: it measures airflow from 1–35 kg/h, and the rotating sleeve bypass can extend the measurement up to 50 kg/h. The bypass design is the part that allows headroom for higher airflow conditions, but it’s not something you’d typically run all the time. If you’re mostly dealing with low-to-mid throttle balancing, you might not need the bypass at all—so the extended range only really matters if you’re working where airflow climbs.
Key features that show up in day-to-day use
This tool is positioned as a carb & throttle body synchroniser that’s aimed at accurate balancing, using airflow readings for multi-carb and ITB systems.
A few details stand out from the description:
- High-flow airflow measurement: suitable for measuring airflow from 1–35 kg/h, with bypass up to 50 kg/h.
- Adjustable bypass sleeve: the rotating sleeve can open a bypass to extend measurement range.
- Wide intake fit range: rubber cone intended for 48–70mm intakes, with the extra notes on approximate carb and bore sizes.
- Universal-style usage: described as usable for ram pipes, velocity stacks, and direct intake fitting, including multi-carb and ITB setups.
- Compact workshop size: listed as approximately 105mm length and 48–69mm diameter body, so it’s easier to store and handle than bulkier approaches.
None of that automatically makes it “easy” for first-timers, though. If you’re new to synchronising carbs or throttle bodies, you’ll still need to understand your own engine’s procedure (idle stability, warm-up, how you adjust linkages, and what readings you expect to see).
Where it shines (and the engines people typically have in mind)
The Synchrometer is described as ideal for Weber, Dellorto & SU setups, and it’s also framed for carb and throttle body balancing across multi-carb and ITB systems.
So where does it make sense?
You’re likely to get the most from it if you’re:
- tuning several throttle points and want consistent cylinder-to-cylinder airflow readings
- working with intakes/carb bodies that are in the stated 48–70mm cone range
- doing higher-RPM tuning where the bypass extension up to 50 kg/h can give you headroom
Worth noting that it’s more of a specialist tuning instrument than a one-off diagnostic gadget. If your goal is quick “is it roughly equal?” checks, you may find yourself looking at simpler tools first—this one is about getting closer to accurate balancing.
The limitations to be aware of
No tool like this is completely plug-and-play.
You should take care with three areas:
- Seal and fit quality: the rubber cone fitment range matters. A slightly off fit can mean you’re measuring less reliable airflow.
- Choosing the right measurement mode: the bypass is meant to extend range up to 50 kg/h, but it’s still your job to use the correct approach for your engine’s conditions.
- Expectations for “universal”: although the description says it works for ram pipes, velocity stacks and direct intake fitting, your actual intake layout still needs to physically cooperate.
It’s not the best choice if your setup is outside the cone’s practical range or if you want a quick, low-fuss process with minimal adjustment effort.
Is it worth it?
It makes sense if you’re setting up or tuning multiple carbs / throttle bodies and you want an airflow-based synchroniser that can handle 1–35 kg/h readings, with an adjustable bypass that extends the measurement up to 50 kg/h. It’s a solid pick if your intakes fall within the 48–70mm range and you value a dedicated balancing tool for workshop use.
It might not be a great match if you’re unable to achieve a good seal with the rubber cone, or if your engine layout doesn’t suit direct intake/stack-style fitting. And if you only need rough checks, you may find this approach a bit more involved than you want.
In short: for people who actually go through the synchronisation process, it looks like a serious bit of kit. For everyone else, it could be more complexity than necessary.
Mini FAQ
How does the bypass feature affect measurements?
The description states the rotating sleeve bypass extends the measurement range from 1–35 kg/h up to 50 kg/h. In practice, you’d use the bypass when your tuning conditions push beyond the standard range.
What engines and setups is it aimed at?
It’s described as suitable for Weber, Dellorto and SU setups, and for balancing multi-carb and ITB systems.
Will it fit my carbs or intake bores?
Fitment is stated for 48–70mm intakes. The rubber cone is also described as fitting approximately 62–70mm carbs and 51–67mm intake bores, but if your components sit outside these ranges, you’ll want to think twice.
Can it be used on ram pipes or velocity stacks?
Yes, the description includes ram pipes and velocity stacks as intended usage contexts, as well as direct intake fitting.
Final verdict
Overall, the BK STE Schleyer Synchrometer looks like an airflow-measurement synchroniser built for people who want more accuracy than “eyeballing” balancing can provide. It’s best when your intake geometry matches the cone range and you’ll benefit from the bypass extension if your tuning goes into higher airflow conditions.