One of the biggest controversies in Nascar was when Toyota came around. All other manufacturers are forced to use a production pushrod V8 block, and then modify it to race. There used to be a "must be 500 available to the general public" rule for engines, but not anymore. All of the big 3 were allowed to make very slight modifications for their next generation engine, but it's still the same block they've used for years. When Toyota came around, they have never mad ea pushrod engine, so they were allowed to start from scratch. The problem is that they were allowed to design intake ports, exhaust ports, counterbalances, and other aspects of the engine for racing from scratch. A Chevy or Ford V8 was not designed to turn 9000 rpms, but with some modifications, it can. Toyota's were designed to run at those RPMs and their power band is much different than other manufacturers. In fact, the Toyota engines have a variable power band by using different heads. That's where they gained their unfair advantage (if not unfair, at least unequal). That means that with a different configuration, they can have high speed or high acceleration. At a place like Martinsville, you need acceleration. At a Superspeedway, you need top speed. The other manufacturers use smaller engines that are bored out to 358 ci. Toyotas are designed to be 358 ci from the start. What this has allowed them to do is increase horsepower by 50-100 hp, depending on what configuration they're using. Nascar has therefore restricted the Toyota engines to run at similar horsepower ratings. Unfortunately, reducing their horsepower has not corrected the power band issue. In a perfect world, the big 3 would be allowed to design a new engine from scratch, but they don't want to dump the money into such a huge project, whereas TRD didn't mind at all. Chevy is still the manufacturers champion, and their drivers have won the last 6 championships in Cup, so why fix what isn't broken, I suppose.I am not aware of any Toyota pushrod V8's so what is their engine based on.
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