Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: hoffbug
Date: May 03, 2014 09:52PM

Seems there was quite a range of compression ratios for the Olds/Buick 215 V8.. In stock form they ranged from 8.75 - 11 to 1 ..
I was wondering what you are finding for octane requrements in the higher compression engines in real world driving?


MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: MGBV8
Date: May 04, 2014 09:05AM

I get by on premium with my factory 11:1 Buick 215 which I assume has a bit less than advertised static compression.


MG four six eight
Bill Jacobson
Wa state
(324 posts)

Registered:
10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: MG four six eight
Date: May 05, 2014 12:15AM

I ran 91 premium with 10.25 to 1 pistons.
87 cheapy regular with 8.8 to 1 cast pistons.
91 premium with 8.5 to 1 forged pistons and boost.

Bill
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britcars
Phil Ossinger
New Brunswick, Canada
(346 posts)

Registered:
02/02/2009 07:58PM

Main British Car:
1977 MGB Roadster, Rover 3.5 ADVENTURE BEFORE DEMENTIA!

authors avatar
Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: britcars
Date: May 05, 2014 03:39PM

I run regular in my Rover 3.5. Has 10.5 pistons but I'm using a Felpro composite gasket instead of the factory steel gasket so I think I would be in the 9.5 to 9.75 range. No problems with detonation or other issues.


hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: hoffbug
Date: May 05, 2014 10:12PM

Thanks..I'm getting cheaper as I age.


Joyridin'
Ron Z

(12 posts)

Registered:
04/29/2014 12:53PM

Main British Car:
Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: Joyridin'
Date: May 06, 2014 08:14AM

Anybody tried running E85? It is somewhere between 105 and 115 octane. They rate it at 105, but with the alcohol cooling effect, it is closer to 115. A buddy runs 11.5:1 compression with 15 pounds of boost on his street car with E85. It is a much newer engine, but the concept is the same.


Moderator
Curtis Jacobson
Portland Oregon
(4577 posts)

Registered:
10/12/2007 02:16AM

Main British Car:
71 MGBGT, Buick 215

authors avatar
Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: Moderator
Date: May 06, 2014 10:44AM

I'm in the habit of putting Premium in my aluminum V8 even though it's probably a waste of money to do so.


I'm told that when corn and ethanol are in short supply, "E85" pumps sometimes dispense mid-level fuel that has a higher gasoline proportion. The pumps might be dispensing E30 or E50 or whatever, this week. In those cases, the pumps should be labeled accordingly but I wouldn't count on it. If you've got a late model Flex Fuel vehicle, it's no big deal because your engine can sense the difference in fuel performance and adapt automatically. More gasoline in the blend means you get higher MPG. For an engine with a carburetor or a less elaborate fuel injection system...

reference



hoffbug
Tony Hoffer
Minnesota
(323 posts)

Registered:
10/15/2007 05:25PM

Main British Car:
Olds 215 EFI

Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: hoffbug
Date: May 11, 2014 01:52PM

Good to know the 11 to 1 engines are getting by on Pump Premium.


MGBV8
Carl Floyd
Kingsport, TN
(4514 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: alumium 215 V8 guys. What are you using for fuel/ Octane?
Posted by: MGBV8
Date: May 11, 2014 03:25PM

Premium here in East TN is 93. I can get it with or without ethanol.

The local Shell station has two pumps with Turbo Blue race gas for $6.99. One pump is 100 octane unleaded that you can pump into your tank. The other is 110 leaded race gas that you are supposed to pump into gas cans. I used to run a mixture in my Camaro.


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