When did they start and end production?

 

1984 - present

 

I believe '99 was the last year a bike rolled out of the factory with a EVO.

 

Actually it is 1984 to 1999, here is a list of the years of the HD motors

Flathead: 1909-1936

The Flathead was named because of the tell-tail flat vented tops that are recognizable at the top of each cylinder head. This is the famous motor that propelled the Harley-Davidson to victory after victory in the motorcycle races of the twenties.

Knucklehead: 1936-1947

On the eve of WW2, Harley-Davidson introduced an overhead-valve V-twin with knuckly looking valve covers. The new motor, affectionately named the "Knucklehead", performed well both for HD and for America in the difficult years to come.

Panhead: 1948-1965

WIth improvements to engine design, like hydraulic valve lifters that supplied oil through rocker arms, the Panhead hit the market in 1948. It was named for the pan-like valve covers replacing the knuckle covers.

Shovelhead: 1966-1983

By 1966 the Panhead underwent still more improvements. The most noticeable being the distinctive enclosed cylinder head in a sleek, slightly curved top. At a glance this looks unmistakably like a shovel with the pushrods tubes resembling the handle of a shovel, and the shovel itself.

Evolution: 1983-1999

In 1984 on the heels of a bold employee buyout of AMF, the motor company went public and introduced its now famous redesign of the V-twin. This radical new design utilized styled square blocks to house the valve train. This motor, revered as the Evolution engine is known amongst Harley enthusiasts as "the Blockhead".

Twin Cam 88: 1999-Present

With numerous American motorcycle manufacturers trying to surface and resurface, Harley-Davidson introduces its most revolutionary engine yet. The Twin Cam 88 gets its name from its two cams versus the single cam in all its ancestors. This motor also goes by the nickname "Fathead" for just exactly that, bigger heads. With this new engine design Harley-Davison puts one more notch in its insurance for success.

 

Thank-You!

 

Arent they still putting evos in the sportsters?

 

Sportsters has the Revolution.

 

I thought the Vrod had the revolution

 

I never really thought about that but I guess your right, the Sportster may still have the Evo style heads but it has always been a twin cam motor. The Revoution is the V-Rod

 

They call the sporster motor an XL evolution motor. It has been in there since 1986. They redesigned it somewhat for 2004 but it is still an Evo.