Avanti Compression

[mfg]

 Increasing the Studebaker 289 V8's compression ratio to 'R1' specs (with no other factory mods considered) resulted in a............. 1) 5%.....2) 10%.....3) 15%...or...4) 20%  horsepower gain.

[mfg]

No thoughts/guesses here?

[r1lark]

I'm going to say 10%.

[mfg]

5 hours ago, r1lark said:

I'm going to say 10%.

That's it!....You got it!

[64Avanti]

If you start with 8.5 and go to 10.25  (R1) then the gain would only about 5%.  If you check at the rear wheels you might get a higher % increase as you have accounted for most of the parasitic losses.

[64studeavanti]

I will agree with 5% (or less). If you take a 225 hp 289 and bump it up 10%, you get 247.5 which is more than the R1. So basically the math does not work for 10%.