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01-03-2014 08:27 PM  4 years agoPost 1
Grimracer

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Eau Claire WI

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Not that anybody gives much of a hoot or that this is useful to you.. I thought I would show you my Boris Mazor Flow meter.
I use this in RC boat racing (really nice to have for that, we just cannot land and re-tune) but also use it with my Helis.
How it works is it’s a controlled volume and pressure of air that is pumped thought the needle/carb if you’re motor. Some flow meters are propane based and I have had those in the past but this is much nicer.
This is a Gen 2 meter and Boris is on his 4 gen now.. Larger gauge face and lipo power.
This is a great tool for setting up your carb or after a rebuild, its also great for telling you when your motor is starting to go south. It is important to note however that meters with in a generation can be used for comparative readings but out of generation cannot. In other words numbers from a Gen 2 are not going to be compatible with other gens.
One turns on the meter, calibrates the pressure by pinching the line and adjusting to 300mmHg before each test. Place the line on the fuel nipple and take a reading.
So you know.. My TT 56 flows number at:
HSN 45 mmHg
Mid 84 mmHg (Measurement taken with the slit apex in the barrel aligned with the casting parting line)
LSN 145 mmHg (Measurement taken with the slit apex 1mm wide)

This pic show the carb off the motor but of course you can do this with it installed on the motor and in the machine.

One of the benefits of this is.. although it does not self-adjust for air density its better than a shot in the dark. I find that once I have a good set of numbers (get in a few good flights and record your numbers) you can then make adjustments morning, night and month after month with little to no guess work. Maybe because I fly more Scale then anything else I find use in this but its hard to beat for setting up a motor.. want to REALY SEE.. 1/12th turn.. you cannot beat it.. Have a bad needle oring.. you cannot beat it..

Anyway… helps me better understand and helps with setups.

Grimracer

Michael J Zaborowski

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01-03-2014 08:41 PM  4 years agoPost 2
jbjones

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Columbus, Mississippi

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Thanks for the description, Grim. I always kind of wondered what these things were actually measuring when the topic came up over on iWaters.

Edit: I thought that they were measuring the amount of cooling water going through the head, so some could open/restrict the flow.

Makes sense, now.

-Joey

J. B. Jones

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01-03-2014 09:02 PM  4 years agoPost 3
Grimracer

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Eau Claire WI

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Joey,

They can indeed be used for that but the realy benifit to this system is carb tuning.

The ablity to adjust both low and high speed (and mid range for that matter) are just hard to live without when you have one of these. As you might or might not know.. In RC boating (some of the hydro classes and mod tunnel classes) dont use a LSN.. we have to have a VERY fat fuel load to cool the chamber if we have to lift from a 30,000RPM pass. If we dont the system will over heat and the motor will shut off or the boat will not climb back on the pipe.

In my sport 40s and 1/8 Scale I do however use the LSN.. I dont typicaly race those boats WFO!

I take my flow meter with me every time I go flying.. check my notes.. adjust to the number if needed and fly.

Take care dude and look forward to racing (and flying) in 2014..

Grimracer

Michael J Zaborowski

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01-03-2014 09:18 PM  4 years agoPost 4
Russell Bear

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League City, Texas USA

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Mike, Thanks for the topic. I used one of Boris' first or second generation flow meter when I was racing as well. Saved my butt running the twins!

Thanks...

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01-03-2014 09:26 PM  4 years agoPost 5
Grimracer

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Eau Claire WI

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Russell,

First and foremost hope you are well.. As you know first hand.. With a twin its instrumental in getting "numbers".

In heli use its just as nice because you can trouble shoot or setup a new carb with some qualification. Not just a guess.

None of this comes until you use it some but you understand.

take care man

Grim

Michael J Zaborowski

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01-07-2014 03:00 PM  4 years agoPost 6
Grimracer

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Eau Claire WI

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I am getting a few questions on how to set the Low Speed Needle on your motor using a flow meter.

Using a flow meter is a mere guess UNTILL you have a good run on the motor. Regardless of this you can get close using a flow meter.

On my meter. I will just call out the way I do it on a typical motor.. I have found that a LSN setting higher then 150 (.50 size motor) is likely lean (again Gen2 meter).

The real benefit of the meter is you can see the relationship between the LSN, Midrange and HSN using the meter. Having said this it might not mean it’s linear.

On a (3 adjustment carb) To start I set the LSN at 120, the mid at 80 and the HSN at 40. Overall these look to be close to get me started and the motor past the first few tanks.

Grim

Michael J Zaborowski

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