[mgarblik]

With a Q-jet, Fuel A should show all the fuel being used. Fuel B should show 0 and be plugged off. The BSFC is crazy high. The fuel B numbers are contributing to this. The one page printout does not show any air flow numbers. Did they have an air hat on the carb? If not, that's another reason the numbers are so weird. Allot of wrong stuff going on with that printout. It's a computer . Garbage in, garbage out. As mentioned, the only usable data is the oil pressure. Spark plugs should be coal black. If not, the data is completely useless.

[Stan Weiss]

Originally Posted by mgarblik

With a Q-jet, Fuel A should show all the fuel being used. Fuel B should show 0 and be plugged off. The BSFC is crazy high. The fuel B numbers are contributing to this. The one page printout does not show any air flow numbers. Did they have an air hat on the carb? If not, that's another reason the numbers are so weird. Allot of wrong stuff going on with that printout. It's a computer . Garbage in, garbage out. As mentioned, the only usable data is the oil pressure. Spark plugs should be coal black. If not, the data is completely useless.

OK lets do some math. The dyno sheet is hard to read so I may have gotten a number wrong. Lets look at peak Hp - 4300 RPM.

Using Fuel A plus Fuel B and the shown BSFC we get 181.95 Un Corrected HP

Using Fuel A plus Fuel B and the shown A/F ratio we 2036.9 lbs/hr Air or roughly 445 SCFM

Using 181.95 Un Corrected HP and Fuel A we get a BSFC of 1.14097

Using Fuel A and the shown A/F ratio we 1712.7 lbs/hr Air or roughly 374 SCFM

I get a 1.053 Correction Factor

Stan

[mgarblik]

Originally Posted by Stan Weiss

OK lets do some math. The dyno sheet is hard to read so I may have gotten a number wrong. Lets look at peak Hp - 4300 RPM.

Using Fuel A plus Fuel B and the shown BSFC we get 181.95 Un Corrected HP

Using Fuel A plus Fuel B and the shown A/F ratio we 2036.9 lbs/hr Air or roughly 445 SCFM

Using 181.95 Un Corrected HP and Fuel A we get a BSFC of 1.14097

Using Fuel A and the shown A/F ratio we 1712.7 lbs/hr Air or roughly 374 SCFM

I get a 1.053 Correction Factor

Stan

Thanks for doing the thinking, {math} for me. Made some sense out of that mess. I am a little puzzled by that fuel B. It should be zero and blocked off 100%. A Q-jet only has one inlet/fuel bowl. Certainly has some problems there. Some dyno, some carburetor, some engine? I think it's all because it's a Pontiac!!