Revolution Performance
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
There is a law pending in our House of Rep (Federal level) that would mandate ALL gas be sold at I believe it's 95 octane. The thinking there is the refineries will not charge the much higher prices after they get this gas up and running for all to use and it will also help in fuel mileage. Like I said it's on the books but will it ever come up for a vote is anyone's guess.
Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Yup, that math works, I just didn't think you could add a quarter inch of bore without case boring.
Seasoned HDF Member
Joined: Jul 2013
Posts: 11,185
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From: In my head
Thank you!
Intermediate
Joined: Sep 2018
Posts: 33
Likes: 17
From: Ft Worth, TX
High octane
Not a wives tale. High octane allows running higher compression which does produced better mileage.
HD EFI Guru
Joined: Jan 2008
Posts: 4,492
Likes: 4,777
Sure if your building a new engine, but just adding higher octane to and engine that does not need it, typically will lower the fuel economy hence the Old wise tail. Since 87/89/91 has been the fuel standards in the USA for going on 10 + years now, the engines are designed to run on those octanes. Building a new engine to run on say 93 octane or 95 octane is completely different. Putting in higher octane fuel than what is needed typically only lowers the level of dollar bills in your wallet.
Grand HDF Member
Joined: Nov 2017
Posts: 4,251
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From: Texas
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Grand HDF Member
Joined: Nov 2009
Posts: 4,315
Likes: 1,663
From: Tampa
Yes, raising CR allows higher octane with the result of better engine efficiency, but notice I said "alone". Raising octane results in a slower, but more consistent burn. One that is not as susceptible to hot-spot preignition.
Last edited by Mattbastard; Sep 26, 2018 at 09:02 PM.
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Tourer
Joined: Sep 2012
Posts: 497
Likes: 50
From: CA
If anyone is interested this is what the gasoline future may look like in the US.
https://www.detroitnews.com/story/bu...ards/33902227/
https://www.detroitnews.com/story/bu...ards/33902227/