Chrysler, Dodge, and Jeep news from Allpar

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.”)

Anodized Viper TA debuts

Yesterday, at the New York Auto Show, SRT debuted a combination of its Viper Anodized Carbon Special Edition Package with the Time…

Challenger Scat Pack: Dodge 392

The 6.1 liter V8 was restricted to SRT cars; the 6.4 was used only by SRT as well, until Ram got a…

European Jeep sales rose 32%


European registrations of new Jeep vehicles took off in March, jumping 32.4%, the second-largest increase of any Fiat/Chrysler brand. A total of…

Charger, Challenger to sport 8 speeds, more

Dodge has released full details on the new 2015 Dodge Charger and 2015 Dodge Challenger.
All Dodge Chargers, and all Challengers with…

Categories: Motorsports.

Jeep deal for China production by end of April
Renegade in NYC
Renegade and Rubicon

Anodized Viper TA debuts

Challenger Scat Pack: Dodge 392

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