Hi,
I had a little time to play today and went to the local speed shop for some baseline numbers.... I have a '72 Plymouth Valiant with 225/auto trans combo and Power Steering as the only real power robbing option. I recently found a NOS 1920 Holley Carb that I installed...everything is stock including the original exhaust system at 45,000 miles....the only mod is the fuel filter mod and extended tip spark plugs and timing is set at 8 Degrees BTDC.
Things to keep in mind for my runs, peak torque was coming in at @ 2250RPM's and holding level then dropping by 3500 RPM, Horsepower peaked at at @3000 RPM and started to fall off by 3750RPM....speed shop is sending me pics and I will post pics of car and dynojet graphs soon.
First pull was 79.99 HP and 134.20 Torque....the technician tells me she was a little lean and it kept wanting to downshift into 2nd making it hard to get a clean run.....I was ROFL as my prediction was 70 HP so I was just blown away by the numbers.....tech says lets do another run....OK!
Second pull was almost identical and was plagued with downshifting so he shut her down and then lifted the hood and started to say what if we do this and that??? OK!
Third pull I shortened the kickdown linkage and that solved the downshifting...woohooo and then I removed the Air/Fuel screw protection cap thingy and backed the screw about 3/4 turns and was rewarded with a slightly less lean mixture, thumbs up from the tech, "she went 96 miles per hour", and 80.78 HP and 138.08 torque, WOW !!
For an engine that was starting to drop off by 3750RPM's it sure made alot of noise but it was fun and very enlightening....thoughts of lighter reciprocating mass, electric fan, milled head, bigger valves/cam/exhaust stormed in....still deciding what mods to do next....any ideas to hit the magical 100hp ?........nico
! nico