Thread: cubic inches?

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As I remember from the hazy past, a reference book said that the bore limit on a gasoline engine was considered to be 4.0 inches. Once that was exceeded, the flame front would begin to weaken. Many early engines exceeded that and that's where the guide originated. I can't remember if it was also cited in a Smokey Yunick (genuflect here)book or not - he did tons of experimental engine work. Anyway. it's not that you CAN'T, it's simply a case of diminishing returns. I wonder if things like electronic fuel injection stretch that limit now, because that 4" figure assumed use of a carb.

I'm sure that ignition technology, among other things have come a long way since then also. My bore is only .010 from being 5" and it sure ain't short on power.

MAN,, A THOUSAND CU. IN. .. NOW YOUR
THINKING LIKE "JAY LENO"....
CAN'T SAY I WOULD MIND OWNING A
NEW 572....

In street dress, the limit of a gasoline motor is -about- 1 liter (66 cubes) per cylinder. Once you start getting into race setups and super high compression with ideal combustion chambers you can pull off more.

Justin

Originally posted by Hoxviii
In street dress, the limit of a gasoline motor is -about- 1 liter (66 cubes) per cylinder. Once you start getting into race setups and super high compression with ideal combustion chambers you can pull off more.

Justin

Don't forget Gm's 572.

572? hmmmmmmmmmmm........ how about the 396,427,and 454 small blocks

Originally posted by gassersrule_196
572? hmmmmmmmmmmm........ how about the 396,427,and 454 small blocks

$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$$

well then ill build a 301 for just $$ isntead of $$$$$$$$$$$$$$$$$$$$