Difference in BMAZOR flow meters?

[MarkScott]

At a recent race, I didn't have my meter with me. Believe it may be a Gen2, purchased back in 2009 / 2010. With the assistance of Dave Roach, we set my motor with his Gen4. Now at a practice session, I used my meter with the reading Dave set my motor up at the race. It seemed to be lean, even though I was at the rich end of what Dave suggested for the motor.

Specifics: OS XM V1

Race settings w/Gen4: 80 - 90 -- seemed to run good with some smoke

Practice w/Gen2: 80 - no smoke, ran like a banshee in heat. But kept blowing plugs during each run.

I was quickly running out of plugs, K&B L1, so I stopped the practice session.

So the question goes: is there a difference in how each generations of this great tool to be off on a single motor? I realize I need to have my meter with me at all times to set my motors up.

 

[bmazor]

At a recent race, I didn't have my meter with me. Believe it may be a Gen2, purchased back in 2009 / 2010. With the assistance of Dave Roach, we set my motor with his Gen4. Now at a practice session, I used my meter with the reading Dave set my motor up at the race. It seemed to be lean, even though I was at the rich end of what Dave suggested for the motor.

Specifics: OS XM V1

Race settings w/Gen4: 80 - 90 -- seemed to run good with some smoke

Practice w/Gen2: 80 - no smoke, ran like a banshee in heat. But kept blowing plugs during each run.

I was quickly running out of plugs, K&B L1, so I stopped the practice session.

So the question goes: is there a difference in how each generations of this great tool to be off on a single motor? I realize I need to have my meter with me at all times to set my motors up.

You are right! The reading with GEN-4 different than GEN-2 and sensitive to air condition changes. Boris

 

[dave roach]

Mark

All the meters don't read the same.I have tryed 6 meters that were the gen 4 on my OS engine and not the same reading.

Dave

 

[Marty Slater]

Mark been playing with a boating buddy's meter

same motor with only 15% nitro[ stop laughing] mostly just playing around

Gen2 meter I believe at 90 good run 94 pulls plug a little 100 sucks it out

KB1Ls also waiting on some more input from others

seriously stop laughing

Marty

 

[Curtis Maglinger]

We've found the same changes between Gen 4's. One read 90, other 100, and another read 95........ I guess that is just the way it is and that might not make that much of a difference for the motor? My brother has Gen4 and I was going to get one for me and after seeing a couple gen 4's reading different, I figured it would just confuse me and our records......since I'm not the best at adjusting needles. But it is a little easier than lugging the old flow and air density at each race.

 

[Buckshot]

Every flow meter is different! Even ones built the same day of the same vintage. I had 4 meters of the same "generation" lined up on my bench and flowed the same needle with each meter and each one read differently.

The flow meter is a reference tool only. Once you get a good tune and check the needle with YOUR meter that's YOUR number. It will not be the same number if you use someone else's meter.

I love my Boris meter!

 

[Don Ferrette]

Every flow meter is different! Even ones built the same day of the same vintage. I had 4 meters of the same "generation" lined up on my bench and flowed the same needle with each meter and each one read differently.

The flow meter is a reference tool only. Once you get a good tune and check the needle with YOUR meter that's YOUR number. It will not be the same number if you use someone else's meter.

I love my Boris meter!

DING! DING! DING! DING!!!

Exactly! Buck's post is spot on the mark, your meter is YOUR reference. Even the old "gas" flow meters never read exactly the same.

 

[moparbarn]

+2 on Buck's comments. While the meters don't read the same, they are VERY sensitive! Changing the tubing you use from the meter to the boat will change readings. If you want or need to change your tubing from the meter to the boat, flow each boat with the old then the new, & write down what will be your new flow numbers. Learned this lesson the hard way (-;

 

[John Knight]

Someone a year or two ago published a list comparing the readings from a GEN2 and a GEN4 meter. The numbers were vastly different. Maybe someone will remember the list and republished it for reference. It is a ballpark reference as noted previously.

Changing any tubing in the system, meter or boat(s), will likely change the readings as well. Swap an engine and it will change again. Pipe too. I keep a book for all my readings and I record the lake location, temp, humidity, air density, engine, plug type, pipe, prop and then the flow reading. Doing this gives a real solid point of reference for future running.

 

[bmazor]

+2 on Buck's comments. While the meters don't read the same, they are VERY sensitive! Changing the tubing you use from the meter to the boat will change readings. If you want or need to change your tubing from the meter to the boat, flow each boat with the old then the new, & write down what will be your new flow numbers. Learned this lesson the hard way (-;

I have to make clear questions about Flow Meter.

1. The air flow is different from one pump to another and can be ~15%, but very stable. So reading will be different!

2. When air condition changes (atm pressure, temperature, humidity) it change air flow resistance and of course reading;

3. The manometer show resistans for air flow. This include all air flow tract. Any changes in this track will change the reading as well as air condition changes!

Boris

 

[MarkScott]

Thanks all. Figured that was the case, just wanted to make sure.

And Marty, thanks for the laugh! Can't recall the last time I used 15%, even in the old NDS and GTX's...

 

[shoboat]

Boris,

How does the air pump compensate for air density changes during the day?

Just Trying To Figure This Out,

Mark Sholund

 

[bmazor]

Boris,

How does the air pump compensate for air density changes during the day?

Just Trying To Figure This Out,

Mark Sholund

The Flow Meter is sensitive to atmospheric pressure, air density, temperature and humidity. The same position of the needle may give a different reading depending on current air condition. You must adjust the needle to compensate. It is not 100% right, but very close.

This is biggest benefit of new generation of flow meter.

All nitro boaters notice that setting of needle is different depend of morning, midday, evening . Good Luck

 

[Marty Slater]

does the higher nitro make this adjustment more critical ?

marty

 

[bmazor]

does the higher nitro make this adjustment more critical ?

marty

Hi, Marty! This adjustment for fuel flow, I did not run nitro and have zero experience. Boris

 

[moparbarn]

Marty, the needle will be as fickle as ever the higher the nitro you run. The meter shows you a close to ideal flow #, AFTER you find the ideal needle by testing. When you get that great lap, flow the engine immediately. Record that #, it is your # to set the needle to for a VERY, VERY close to perfect needle. Anywhere, anytime, any condition. Changing your setup WILL change the #, test & find the new one.

 

[Marty Slater]

THANK YOU moparbarn

marty