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Thread: BMW M12/M13 turbo 1.5 liter four cylinder Formula 1 motor photos/pictures/specs - 1500+ horsepower

              
  1. #1
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    BMW M12/M13 turbo 1.5 liter four cylinder Formula 1 motor photos/pictures/specs - 1500+ horsepower

    Since there has been discussion about BMW engine building prowess and I was disappointed at the lack of knowledge displayed I thought I would post some details and pictures. I am going to do a retrospective article on this motor but for it to be up to my standards I will need to spend some time doing research.

    Just some quick info, this motor is based on a BMW M10 production block from the 60's. Yes, a production block from the damn 60's. They would seek out seasoned blocks and ones that had gone through many heat cycles as these were often the strongest. I'm not a metallurgist but someone else should be able to explain why.

    Anyway, these motors actually produce more power than the dyno's they were using could even read so we don't even know the exact figures. They say 1500 horsepower at 79 psi or so but rumors were they saw even more than that.

    Formula 1 changed the rules because BMW simply raised the bar (pun intended) too far. BMW then left Formula 1 after turbocharging was banned. This right here is what makes me proud of BMW, a production engine that dominated in racing for over 2 decades:

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  2. #2
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    Click here to enlarge

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    Sick little motor.

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    Click here to enlarge Originally Posted by Sorena Click here to enlarge
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    Sick little motor.
    More like we should bow in worship.

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    The reason they wanted a seasoned block was because all the heat cycles redistribute the residual stresses that were left in the block after casting/machining. After a block is cast, machined, heat treated etc... If you were to view the block in a stress profile (such as in a casting FEA analysis) you will see that it has internal stresses that are present. When you add on top of that external stresses, you have a part that has both residual internal stresses and forced loads on it. So a block that has been stress relieved such as a seasoned block was preferred back then.

    Nowadays blocks generally get stress relieved, as do cranks, rods etc... Shot peening rods is also a common theme to help increase strength. They shoot tiny steel balls at the rods to compress the outer surface, since the outer surface is in compression any cracks that form will want to close back up and not propagate.

    the M10 was an amazing little engine. It was simple, and strong. They made over 1500 hp on boost alone, stock block.

    Speaking of which, where is that guy with the M10 that ran 12s? I think it was a brown colored 318, he doesnt post much, someone @ him I forgot his name.
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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
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    More like we should bow in worship.
    Wondering what was Datsun building
    in that era.

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    Here is an engine that was rebuilt recently and dyno'd at just 3.3 bar. It makes 200 hp at 7000 RPM, but 800 hp at 9500 RPM!!!




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    Do want!

    sales@ardesign.info | tel. 303.351.3515| www.ardesign.info
    Powering some of the world's fastest BMWs

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    Wow. And I thought 1000whp Supras were laggy!

    What octane fuels did they use for this stuff?

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
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    Here is an engine that was rebuilt recently and dyno'd at just 3.3 bar. It makes 200 hp at 7000 RPM, but 800 hp at 9500 RPM!!!Click here to enlargeClick here to enlarge
    They could take these thing to over 12,000 rpm and 4 bar. They got limited to no more than 4 bar after that...

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    Click here to enlarge Originally Posted by SlicktopTTZ Click here to enlarge
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    Wow. And I thought 1000whp Supras were laggy!

    What octane fuels did they use for this stuff?
    I believe it was nitromethane.

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    Interesting. The throttle body is mounted right on the inlet of the turbo. I think that would remove the necessity for a BOV. I'm not sure about the other effects this would have.

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    I actually think I see independent throttle bodies at the cylinder head AND a throttle body before the turbo. Quick throttle response, and no need for a BOV.

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    Sticky I dont think it was nitromethane, I am sure they used pure toluene which is about 118 octane fuel and the equivalent AFR's of regular gasoline. Toluene is the main ingredient in gasoline which is a mixture of different hydrocarbon chains, the pure $#@! is very high octane and also very cancer causing.
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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
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    Sticky I dont think it was nitromethane, I am sure they used pure toluene which is about 118 octane fuel and the equivalent AFR's of regular gasoline. Toluene is the main ingredient in gasoline which is a mixture of different hydrocarbon chains, the pure $#@! is very high octane and also very cancer causing.
    Yeah, it's not nitromethan, that $#@! is crazy.

    If I recall correctly, they wanted to use pure toluene but that had to add something else in order to lower the octane for whatever reason. Not because they wanted to, it was the rules.

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    3 out of 3 members liked this post. Reputation: Yes | No
    According to Ian Bamsey in his book "McLaren Honda Turbo, a Technical Appraisal", the F1 teams, including Honda, were running 86% Toluene 14% n-Heptane to meet F1 requirements.

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    Click here to enlarge Originally Posted by andrew20195 Click here to enlarge
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    According to Ian Bamsey in his book "McLaren Honda Turbo, a Technical Appraisal", the F1 teams, including Honda, were running 86% Toluene 14% n-Heptane to meet F1 requirements.
    Thank you! I knew I had read something like that.

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