DarkHorse/GT/ PowerPoint chatter

[D/\rK•650]

To be clear, I am not claiming it is "all bull." I just don't know, and there is not sufficient information available to me searching on the internet to make a decision one way or the other on some of the marketing claims.

Understood. No worries.

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[Marty1000]

Just checking page 12 in the DH book that came with the purchase of the vehicle it clearly states that the DH uses the GT500 forged connecting rods. The crankshaft shares same steel forging as used on Mustang GT3. The cylinder heads have a new intake manifold with two 80mm throttle bodies. There is no more info on engine internals.

 

[Junkyard Dog]

The crankshaft shares same steel forging as used on Mustang GT3.

Interesting. I wonder if that is the forging prior to machining. The GT3 is a 5.4 liter engine that starts life as a Gen 4 Coyote 5.0. I can't find what they do to it to get the extra 0.4 liters of displacement.

 

[Junkyard Dog]

https://www.mustangspecs.com/mustang-gtd-vs-gt3-comparison-performance-design/

The engine is modified with a larger bore and stroke, resulting in a 5.4-liter displacement. The cylinder block and heads remain similar to standard versions, and many parts like the valve train and crankshaft are shared with production models.

Engine Base	Coyote V8 (S650 Mustang derived)
Displacement	5.4 liters (94 mm bore x 96.5 mm stroke)
Fuel Delivery	Direct injection only.

 

[Junkyard Dog]

Valve Train	Mostly standard components
Crankshaft	Production matching forging

 

[Junkyard Dog]

Only direct injection is used to keep the system simple and reliable for long races.


And that is all I can find.

So maybe they machine a production forging for a slightly longer stroke. Stock stroke is 92.7 mm. Stock bore is 93, so they increase the bore by only one mm. The increased displacement is almost entirely due to the increased stroke of 3.8 mm.

 

[Junkyard Dog]

Callies makes a 4340 forged crankshaft with this stroke, but everything I read, including what I posted above, is that they somehow use the production forging in the GT3 car.

https://www.callies.com/catalog/product/compstar-ford-coyote/

 

[Junkyard Dog]

The GT3 engine is hand built in England. You can see it at around 3 minutes into this video.

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