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

George
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.
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on: Mon 16 of Apr, 2018 [16:18 UTC] reads: 66

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330Topolino
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Re: Re: Re: Max Compression ratio on pump gas?
on: Mon 16 of Apr, 2018 [17:02 UTC] score: 0.00
> > 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.


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