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Old February 22nd, 2019, 08:46 AM   #201
jkv45
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I thought the only advantage of E85 was the ability to crank the boost, and not much to be gained for a normally aspirated engine.

Is that right?
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Old February 22nd, 2019, 09:21 AM   #202
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Quote:
Originally Posted by jkv45 View Post
I thought the only advantage of E85 was the ability to crank the boost, and not much to be gained for a normally aspirated engine.

Is that right?
Ability to "crank the boost" on E85 comes from two things. First, it's a higher octane rating them regular pump (around 105 octane). Second, ethanol burns cooler, so lower cylinder temps.

There is gains to be had an a NA engine. On a NA 250, no, probably not much. But I ran E85 (with increased timing) on my NA ZX12R and it did provide gains.

Of course all depends on your combo, compression ratio, ability to adjust timing, etc
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Old February 22nd, 2019, 04:18 PM   #203
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Yep, E85 is about 108 octane and actually out-performs 110-octane race-gas I get at Sears Point raceway down the street. Most likely due to the cooler running to avoid detonation. Yeah, on NA engine, you have to tune to get extra power such increasing compression and advancing timing. Using in stock Ninja 250, won't get much gains.

I can actually run 13.0:1 compression on 100-bore NA engine with E85. Or 25psi with boost.
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