looses power

[Pvt Parts]

Originally Posted by 69Cobra

Yes. But there's not 3 or 4 tenths more with the same hp to run 122mph.

Just curious does anybody have good data on what it takes hp wise to pick up 1 tenth at this level?

You're right. If he's looking for 3 to 4 tenths, he's down on power big time.

[69Cobra]

Originally Posted by Frank Castros

Thanks Glenn,

This is not my car, but a friends who is not a Class Racer member and cannot post here. It was my idea to post because he's is frustrated and I knew you guys could help.

I know the engine has been dyno tested, but not flogged and I'm not familiar with the data.

Because of the small carburetor I think the Super Victor intake is too much, and he's going to try the smaller Victor at the track.

The fuel delivery theory has been adequately addressed, and I agree the 2.77 low gear and 4.89 rear are correct for the combination, also shifting at 6,000 seems to make sense.

Thanks to everyone for the thoughts, but if there are more ideas, I'm all ears.

He's only looking to go 10.40s or 50s.

This is what I was going off of.

[D. Hake 4459]

I'm with Paul in post #2. Jim Hale could be a big help on that combination. His '64 Sport Fury can run those times in G/SA at about the same weight. I wouldn't expect him to give away all his secrets but he might point you in the right direction. I don't know how tall of a tire you have on there but that seems like a lot of rpm for 122 mph. Converter slippage?

[Paul Precht]

Approx 15 HP per tenth in this range and weight. Four tenth's quicker with the present gearing would put this car through the traps around 8,000 RPM with a motor that makes peak HP below 7,000, not good for ET or the life of the motor. Without knowing the cam specs, head casting and flow specs it's hard to know what the potential is and that's assuming the short block is up to snuff. The carb should be set up on a flow bench because just a couple of degree's on the secondaries with an AFB can make a huge difference in flow, and when you're running a carb that's the equivalent of a 2BRL carb on a motor this size that is very important.

[69Cobra]

Based on some MPH, RPM, Gear ratio calculations assuming he's using a 30" tire with very little % slip. He's either running 136MPH, a 5.49 gear or only really turning it about 6,681RPM's. Obviously we know what his real MPH and gear ratio is, so that only leave a couple things. Either its only running about 6700 out the back or the converter is flat gone and slipping over 10%.