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#30173 05/19/2002 6:59 AM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | Note that those are both for 4 bbl carbs, 2 bbl carbs use a different flow measurement system. I just wish that I knew the relationship between the two.
Fred
52 3600
69 C-10
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#30174 05/19/2002 11:25 AM | Joined: Jan 2000 Posts: 1,586 Extreme Gabster | | Extreme Gabster Joined: Jan 2000 Posts: 1,586 | Ok Fred, we all know relationships are difficult but......4 bbl carbs are rated for cfm at 1.5 Hg of pressure drop(vacuum)and 2 bbls are rated 3 Hg of pressure drop.To rate a 2 barrel the same as a 4 barrel a conversion factor of 1.414 can be used. So, for example,a Holley 500 cfm 2 bbl carb is 353 cfm if rated on a 4 bbl scale.The above information is from various carb tuning books. | | |
#30175 05/19/2002 3:38 PM | Joined: Feb 2001 Posts: 1,897 Member | | Member Joined: Feb 2001 Posts: 1,897 | Well, as for thr one-barrel carbs, CFM =Can`t Flow Much! 
There is enough good in the worst of us and enough bad in the best of us that it does not behoove any of us to criticize the rest of us.
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Be yourself. If you are ever lost, It will be much easier to find yourself if you know who you are!
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#30176 05/19/2002 5:53 PM | Joined: Apr 2002 Posts: 99 Wrench Fetcher | | Wrench Fetcher Joined: Apr 2002 Posts: 99 | What is the max RPM of a 1958 series 235?
What is the volumetric efficiency of a 1958 series 235?
What is the importance of volumetric efficiency? | | |
#30177 05/20/2002 9:44 PM | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | JD, your max rpm depends on how long you want the engine to last and what you have done to improve it. Continuous running of a stock 235 over 3,000 rpm is not recommended. I've had mine (with a 3/4 race cam) up to about 4,500, but only for a very brief period. If you have balanced rods & crank, electronic ignition, the right pistons and valve springs and a better damper, 6,000 is obtainable, but not recommended.
Fred
52 3600
69 C-10
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