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Ron Earp · 12-19-05, 11:08 AM

If you take that formula and plot venturi size vs. peak RPM, for a 342 inch motor, this is what you get.

I did it in a spreadsheet so I can vary engine displacement easily and the results are telling. A 289 is very happy with 44mm venturis since it'll go to over 7800, while 347 is not and will peak about 6700 RPM.

12-19-05, 11:08 AM	#17 (permalink)
Ron Earp Ron Earp Site Administrator Join Date: Sep 2001 Posts: 3,936 Rep Power: 57	Re: TWM/Weber manifold flow If you take that formula and plot venturi size vs. peak RPM, for a 342 inch motor, this is what you get. I did it in a spreadsheet so I can vary engine displacement easily and the results are telling. A 289 is very happy with 44mm venturis since it'll go to over 7800, while 347 is not and will peak about 6700 RPM. Attached Thumbnails