Oops, I said that wrong, in the SR classes ESR really no longer exists except
in other sanctioning bodies, and there it's usually 850 cc, though that varies
too. The sizes (or more correctly, performance potentials) go from A (biggest)
to H (smallest). As you'll see from the other replies, these rules are
complicated, as you would expect any rule that started out too simple (engine
size) and later was tweaked frequently to try to keep race classes reasonably
competitive across marques.
On Jan 3, 2010, at 8:17 AM, Bill Babcock wrote:
> They are SCCA (Sports Car Club of America) classifications. P means
>production, the D and E reflect the performance potential of the car. In
>theory (or at least in the sports racer categories, like DSR which means D
>Sports racer) it's based on engine size, with D being 1 liter and E being two.
>In practice it has more to do with what the rules committee had for breakfast
>and who owns the ox that is being gored.
>
> TR3's are usually EP, Peyote is EM which means E Modified.
>
> On Jan 3, 2010, at 5:11 AM, MadMarx wrote:
>
>> I've several times seen these DP EP extension on the US car numbers.
>> What does they indicate?
>>
>> Cheers
>> Chris
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