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Bob Brown four-valve Ducati TT2

Bob Brown & Darren Andrew Smith designed a four-valve DOHC head for the TT2

Phil Aynsley by Phil Aynsley
March 19, 2021
in Ducati News, Features
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Ducati four-valve TT2

With Phil Aynsley


Less well known than the two-valve Ducati TT2 based racer that Kevin Magee used to campaign for Bob Brown in the early ‘80s is this follow up design which was originally fitted with four-valve heads.

Ducati four-valve DOHC TT2 concept

As the TT2 was approaching the end of its development Bob and engineering student Darren Andrew Smith (who used it as his thesis), set about designing and constructing a set of four-valve DOHC heads from scratch (this was before Ducati’s own 851 was released).

Ducati four-valve DOHC TT2 concept – Rod Tingate built the twin spar monocoque alloy chassis and swingarm

Conceived from the outset for possible street use, the heads were designed to be fitted on to a standard Pantah motor with a minimum of fuss – wider belts and pulleys and raising the barrels by 5 mm being the only requirements needed to have them mounted.

Ducati four-valve DOHC TT2 concept

Testing revealed teething problems (some cracking) so the four-valve heads were replaced by two-valve items after some time (as photographed).

The slight mismatch of the two-valve motor’s intake to the bodywork designed around the four-valve motor can been seen here.

Rod Tingate was responsible for the twin spar monocoque alloy chassis and swingarm. The fuel is pumped from the lower sections via two diaphragm pumps (pulsed from the exhausts) to the built-in header tank behind the steering stem, then by gravity to the carbs.

Ducati four-valve DOHC TT2 concept

The front guard design predates that of the Kawasaki KR500 or BMW K1.

Ducati four-valve DOHC TT2 concept

These images are of the improved Mk II version of the four-valve heads, cast from the original patterns by Steve Howell. It is fitted in a lightweight Browell frame – designed by Howell, Doug Dunn & Graeme Brooker in the early 1990s.

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Phil Aynsley

Phil has been a Ducati rider for 45 years and professional photographer for the last 27. Best of both worlds really!

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