13:1 Compression Pistons in 340 Small Block

nm9stheham said

Very good point on the e85... I'd put e85 and 12.5 SCR roughly on par with 93 gas and 10 SCR.

The e85 idea ought to tempered with the OP's availability. Not as hard to find around bigger cities, along interstates and in the cornbelt. Not the case here, I have 1 station within a 30 mile radius and 5 stations within a 70 mile radius. It goes to 0 stations if you head west into the mountains of VA and WV. And in the Rockies, it is 100-200 between stations in most areas. Not a good choice for a higher consumption rate fuel and a not-great-fuel-mileage engine to start with.

I dunno exactly where in OH the OP lives to see; in the southern part of OH, e85 availability looks darned poor.

Click to expand...

I agree. And want to reiterate the point that availability of E-85 in the midwest (corn country.) Is decent. May not be true everywhere around the country. And on a final note. Exhaust will smell different. I think it smells a little like french fries mixed with petro. And fuel efficiency certainly falls. I'm not sure how much at WOT. But could be as high as 40%. You get less BTU of energy from alcohol than gas. But you can compress alcohol alot farther before auto detention.

I love listening to the younger "Tuner" kids speak that higher octane and race gas increases power in and of itself. It doesn't. In fact it produces a little less energy. But higher octane can be compressed more than low. So in the end? You want to use the lowest octane fuel your build will accept before detonation issues occur.