Dissapointing results switching to 7" converter

[Chris Hill]

Originally Posted by Kevin Panzino

Recently bought a new 7" converter from a reputable converter company.

Had run an old tried and true Munsinger 8" for eternity. That converter flashed to ~6,200 RPM with my combo (255/294 HP 350 SBC, powerglide, 2.08 1st gear)

Was looking to try an additional ~500 RPM stall. Converter company stated they would recommend a 7" converter for this application. Put it in the car. No other changes. They got the converter quite close, as it flashes right around 6,600 RPM. So far so good, right... WRONG... Car lost a FULL TENTH in 60' and is down .2 to .25 in 1/4. Car is confirmed to be hooking up with no spin. Big end speed is only 1/2 MPH off when the ET is .25 down, so Engine HP is still there and slip is same as old 8" Munsinger at big end so this tells me the converter is pretty efficient once it gets to overunning the sprag on the big end.

It seems the 7" converter just physically has much less torque multiplication than the 8" at a given stall speed....

Anyone else have similar experience that can chime in?? Feel free to PM me, if you'd rather not discuss in public...

Kevin Panzino

Do you have a torque curve you could share?


Or stated another way, do you know your torque at 6,200 rpm and torque at 6,600 rpm?

[Dick Butler]

Would the ones who picked up tell how high they go through the traps RPM wise?
Then the ones where 8 worked better give finish line RPM. The higher usable RPM range motors will probably pick up with the 7" as suggested.