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Posted:
Wed Mar 31, 2004 9:52 amby HP by GD
Hi Guys
I found this great forum just recently and I am new to all this information. I have a question about making a device to use on my dyno to measure the air flow into the motor. Are the meters that most of the companies sell using the annubar type device? If so is there a place where I can read a how to make one? I am very new to this so I am looking for some serious help!
Thanks
GD
Posted:
Wed Mar 31, 2004 1:56 pmby maxracesoftware
Link to 2 pictures of SuperFlow Air Turbine
the Air Turbine uses 0 to 5 volts
with certain value volts = CFM
could adapt Air Turbine from SuperFlow or Land & Sea Dynometers to your Dyno ???
i use the Air Turbine along with hooking up Vacuum ..to check
Carb CFM , Volumetric Efficiency, BSAC, A/F Ratios,
carb's jet front -to- rear , check also intake and exhaust
wave tuning effects , etc.
Like you, i always wondered about a annubar type device ??
it might be better than Air Turbine ????
The Air Turbine will sometimes affect engine's HP/TQ output
because carbs breathe from sides as well as top
and Air Turbine adds to tuned length a little in effect
after making so many dyno tests and gathering Data,
i remove Air Turbine for rest of Tests to compare .
Rochester Q-Jets and Carter ThermoQuads seem more sensitive to dyno tests with/without Air Turbine
and Holley carbs usually are not as much affected
the Air Turbine is great at revealing tuned lengths/diameters
especially on Exhaust side
Posted:
Wed Mar 31, 2004 2:39 pmby Mouse
Annubars require a lead-in length and exit because they require the air flow velocity to be evenly distibuted in the pipe to get an accurate reading. So they may not be well suited to mount on top of a carb because of the wave-tuning effect already mentioned.
My flow elements require a much shorter lead-in, and even shorter exit, but non-the-less, a lead-in is still required.
John