Interesting Weber jetting

[rlearp]

Might want to have a look at this one on venturi size:

Optimal Venturi Size for Engine Displacment

Seems to have been borne out through emperical use too.

How was power with those chokes at say 5500 plus? Does the dyno show the power flattening out? I would guess that is one torque monster due to the indivdual runners and relatively small venturi size!!!!!

Ron

[Eljaro]

Sure Ron, mathematically a 427 needs lots of air. 48 IDA with 42mm venturis will probably still be too small . Bergs 58 Weber lookalike will probably be the ideal carb. Lots of money though.
The question is which size carb and choke can a 427 digest without losing low and medium rpm flexibility and make both cruising and high speed operation compatible. For now the 40mm choke meets that compromise well.
I'll try the 42mm as soon as I have the engine back together.
Yes, it is a torque monster, not less so with the 40 chokes. Can't tell anything about dyno measurments, since all testing was done in the car driving on open road, but I could not follow the tach needle, so fast was the engine revving up. I just shifted when the MSD limiter set at 6500 came in. Seat of the pants dyno that is.
But is was pulling over 5500 like hell.
BTW It was your comments in the GT40 forum and that chart of yours that really moved me to try larger chockes than recomened (i.e. Inglese) around here.