Flow testing

[JD 1931]

What size container (in CC) is use to measure the amount of flow when testing zenith jets and where can it be bought? Thanks...

 

[Brian T]

Hello JD 1931,
I purchased mine from a medical supply outlet and it measures to 250ML
they can also be found at a photography supplier.

 

[JD 1931]

Thanks for the info, ordered one on Amazon.....

 

[MikeK]

If you have a scale that measures in grams you can use any old container for your timed catch. Just tare it out. 1g H2O = 1cc = 1ml. This will be more accurate than trying to read the meniscus on some graduated containers.

 

[Brentwood Bob]

what to use to hold the jets in place? clear tubing?

 

[160B]

What size container (in CC) is use to measure the amount of flow when testing zenith jets and where can it be bought? Thanks...

I use a 100 ml for the idle jet and a 250 ml jet for the others. One ml equal one cc.

Flow test values (jets):​

Main – 140-150 cc per min.​

Cap – 150 – 180 cc per min.​

Comp – 138 – 142 cc per min​

Idle – 38 – 42 cc per min

 

[160B]

what to use to hold the jets in place? clear tubing?

I built mine from PVC tubing with a submersible pump. I used plastic tubing to attach the jets.

 

[Brentwood Bob]

Looks like I will be rube goldberging an appratus. Don't want to be accused of tinkering. Thanks for the pictures and explainations.
Now if I can just keep the fuel clean.
Bob

 

[RUNNERBUN]

I use a 100 ml for the idle jet and a 250 ml jet for the others. One ml equal one cc.

Flow test values (jets):​

Main – 140-150 cc per min.​

Cap – 150 – 180 cc per min.​

Comp – 138 – 142 cc per min​

Idle – 38 – 42 cc per min

Hi 160B, as a matter of interest, do you have a suggested flow rate for the Model B Carb. and also what head pressure do you use for the above flow rates.
Thanks
TC

 

[Wagga A'er]

Ford Garage has wealth of info on the B carb including flow rates.

 

[RUNNERBUN]

[QUOTE=Wagga A'er;1122410]Ford Garage has wealth of info on the B carb including flow rates.

Thank you Wagga A'er. I have seen the information on the Ford Garage site, however it seems that some use a head pressure of 36" others use 37 1/4" while others do not state a head pressure.
There has been information here on the Barn where new flow rates have been developed to give the best power and economy and are more suited to the modern fuels. Very rarely is the head pressure given for the new flow rates.
I am running a standard 32 to 34 engine, with counter balanced crank. (C on the Head) and I'm striving to get the best of both worlds. (power and economy}

 

[Synchro909]

I use a 100 ml for the idle jet and a 250 ml jet for the others. One ml equal one cc.

Flow test values (jets):​

Main – 140-150 cc per min.​

Cap – 150 – 180 cc per min.​

Comp – 138 – 142 cc per min​

Idle – 38 – 42 cc per min

I assume that is using water and with a head of 40". Is that so??

 

[160B]

1. Tom Endy's web site,specifies the following flow rates using a 36 inch column of water.

http://www.ocmafc.com/techarticles/Tom%20Endy%27s%20Special%20Topics/Newer%20-%2001-2010/Zenith%20Carburetor%20Overhaul%20-%2011-2007.pdf

Flow test values (jets):​

Main – 140-150 cc per min.​

Cap – 150 – 180 cc per min.​

Comp – 138 – 142 cc per min​

Idle – 38 – 42 cc per min

2. Steve Pargeter's Zenith Model A Carburetor Restoration Guidelines version 3 specifies the following flow rates with a 36 inch column of water.

Flow test values (jets):​

Main – 150-160 cc per min.​

Cap – 150 – 185 cc per min.​

Comp – 138 – 142 cc per min​

Idle – 44 – 48 cc per min


3. Gordon Biggar's Restoring the Model "A" & "B" Carburetors the "Rex" Reheis way specifies the following flow rates for the A carburetor

Carburetor Flow test values (jets): at 36 inch column of water Model A​

Main – 140 - 150 cc per min.​

Cap – 150 – 185 cc per min.​

Comp – 138 – 142 cc per min​

Idle – 44 – 48 cc per min
​

4. Gordon Biggar's Restoring the Model "A" & "B" Carburetors the "Rex" Reheis way specifies the following flow rates for the B carburetor

Carburetor Flow test values (jets): at 36 inch column of water Model B​

Main – 136 - 142c c per min.​

Cap – 372 – 462 cc per min.​

Comp – 110 - 118 cc per min​

Idle – 43 – 47 cc per min
Power 110 - 118 cc per min

Carburetor Flow test values (jets): at 37.25 inch column of water Model B​

Main – 138 - 144 cc per min.​

Cap – 378 - 470 - 185 cc per min.​

Comp – 112 – 120 cc per min​

Idle – 44 – 48 cc per min
Power 112 - 120 cc per min



TC, I hope this helps. There are a lot of different flow rates recommended, In Gordon Biggars book they state the ranges were developed by Steve Pargeter, so you may assume that that the main jet flow data in paragraph 3 above (140 - 150) is a typo and should be 150 - 160??

 

[Kevin in NJ]

here is the link to Vince's site which gives the Ford specs for flow rates:

Flow Rates

 

[RUNNERBUN]

Thank you 160B

Regards from down under
T&C

 

[Brentwood Bob]

Wonder what Renners Corner uses? and/or Berg's? Guess I will call.
Appreciate 160B documenting his sources.
Bob