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Forum: Hot Heads Tech Talk

Forums->Hot Heads Tech Talk->Re: Re: Re: Max Compression ratio on pump gas?

330Topolino
Re: Re: Re: Max Compression ratio on pump gas?


> > No personal experience (yet), but have heard from multiple sources that E85 allows for some significantly higher compression. Requires a much lower A/F ratio, so your mpg will be down. But runs cooler and will make more HP. It’s all a trade-off.
>
> Higher C/R because it has a higher octane rating, but the lower MPG (about 25% reportedly) is because E-85 simply doesn't have the energy (BTUs) in it that E-0 or E-10 has.

BTU difference is true on gallon for gallon basis, hence the lower MPG. On the other hand, factoring in the lower F/A ratio you can make more HP. Like I said, it’s a trade off.
  user offline
on: Mon 16 of Apr, 2018 [17:02 UTC] reads: 92

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