THE PROBLEM

Since the deliveries of the Roadster 3.7 began, we received reports of "leaky hoses" and the like. On a hotter day or after 2-4 laps at the track, leaks would appear or the coolant would dump.  The reports became more widespread during hot summer months and any number of dealer explanations and factory explanations were sent to us. "Loose clips", "imperfect hose shape", "overaggressive driving". Though all of these could be true, from this seat, it seemed unlikely that so many cars would suffer from the same very rare factors.

Chronic coolant leaks and boil overs with cars of the same model line, normally point to something more generically wrong with all of them.  Both these symptoms can be caused by over-heating. Failing some engine fault, overheating can be caused by a coolant system that is inadequate or marginal to the task it is put to.

What is causing the extra heat?

The Roadster 3.7 is the first Roadster that can develop a traditional tuned Plus 8's horsepower. It is the most powerful stock Classic to ever leave Malvern, and 30-50%  more powerful than its Roadster predecessors!  However, owners of power-enhanced cars will invariably tell you that more power produces more heat unless adequate cooling provisions have been made to handle it..especially with the lean mixtures today's emission-sensitive cars must run on.  Without adequate cooling:
 

	=		=		=
MORE POWER	=	MORE HEAT	=	MORE PRESSURE	=	LEAKS/BOILOVERS

THE SOLUTION

Inadequately cooled Morgans (be they incredibly muscly Plus 8s or old 4/4s) have one pitstop. Peter Mulberry @ MULFAB. The Factory turned up there a couple of weeks ago.

They had built a new road legal 3.7 roadster race car for a customer who does sprint and hill climbs and track days and a few of the challenge races. The customer says the car behaves itself on the road. However, it had its first race at Rockingham a month ago. It managed 4 qualifying laps before dumping its water. It was fiddled with and sent it out for the race, managed another 4 laps and dumped its water again. More fiddling. Then it went to a Goodwood sprint and managed two laps. Dump, dump.  This was the point it was delivered to Peter.

Peter fitted a new Roadster rad, based on the Mulfab normal road replacement, with the hoses to suit. It was completed on Friday (August 16, 2013). The owner picked it up, towed the car (untested) directly to Silverstone for a challenge race where it behaved itself impeccably on a warm day in qualifying. No issues at all. Temperatures and water perfect. Peter also managed to keep the header tank in same location (no room to mount it anywhere else!)

The Solution radiators can be had at MULFAB.