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NASCAR engine changes detailed

In a post at the Petty Racing site, “SpacemanSpiff” described why Petty Racing is not using the new Mopar NASCAR engine, as Penske is.

Several factors are involved. First, it appears that development was curtained by GEM for a time due to doubts about Dodge’s continued NASCAR involvement and Gillette’s commitment to Dodge.

The new engine, R6P8, is the sixth generation R-block and eighth generation polyspherical head; it is very different from the previous generation, and requires a major redesign to the car. The engine is also 100 pounds lighter, so the weight distribution in the cars needs to change, requiring more development time and making it inappropriate, again, to attempt to put the new engines into cars designed for the existing ones.

NASCAR’s Car of Tomorrow, according to this source, is less forgiving regarding handling and weight distribution, and there is a ban on testing at NASCAR tracks, which makes the situation more difficult. Penske did run the engine last year in some races, but apparently does not share their information with other Dodge teams.

The R5 was a left-bank-leading engine, while the R6 is a right-bank-leading engine, due to NASCAR’s many specifications; the distributor moved to the front of the engine, and many parts were designed for an integral cable-driven fuel pump drive (electric pumps not being allowed). The R5 was retrofitted to allow this, but the R6 was designed for it. The R6 also has a shorter block, despite slightly wider bore spacing, and has a narrower head casting; some external oil lines were replaced by internal passages. There is now more coolant flow through the engine, and it can be directed by engine builders as needed via orifices (as can oil flow; there is room for oil restrictors as well). This engine therefore has more consistent horsepower for longer periods.

(Thanks to “Hemi Magnum” and “Mopar Bob.”)

Steckly scores in National 250

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Three-time series champion Scott Steckly earned his first win of the 2014 NASCAR Canadian Tire Series season Saturday in the National 250 at the Autodrome St. Eustache in St. Eustache, Quebec. Starting from the No. 2 spot, Steckly dominated the race in the No. 22 Canadian Tire/Sylvania Dodge, leading for 202 of the 250 laps and beating Alex Guenette and the No....

Vipers victorious at the Brickyard

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Jonathan Bomarito and Kumo Wittmer participated in the traditional kissing of the bricks after winning the GT Le Mans class in Friday’s Brickyard Grand Prix at Indianapolis Motor Speedway. This is the first Viper win of the 2014 IMSA TUDOR United SportsCar Championship season and it’s a major win for SRT Motorsports....

Friday racing results

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Austin Wayne Self, driving the No. 22 AM Technical Solutions Dodge, finished second in the Scott Get Geared Up 200 presented by Federated Car Care that ran late Friday at the Lucas Oil Raceway in Brownsburg Indiana, just outside of Indianapolis. He crossed the finish line 5.378 seconds after Brandon Jones in the No....

Ram 1500 weight close to 2015 Ford?

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Ram spokesman Nick Cappa wrote, We have received inquiries on weight reduction regarding half-ton trucks and a 2014 vs 2015 weight comparison from one of our competitors. … The 2014 Ram 1500 uses aluminum in strategic locations including the hood, suspension components, engine components and drive shaft. The more interesting story is our apples to apples weight numbers....

Categories: Motorsports.


NHRA-Johnson-Coughlin-Countdown-Web
Coughlin clinches Countdown berth in Sonoma
NHRA-Beckman-Sonoma-Web
Johnson Clinches Countdown berth in Sonoma
NCATS-Steckly-Natl250-Web
Steckly scores in National 250
SRT-IMSA-Brickyard-Kiss-Web
Vipers victorious at the Brickyard


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