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Impact Bumpers
Jonny Hart

Silver LHD 3.2 A27 east outta Brighton.

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US spec with that number plate format and those over riders?

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Quite like us over riders. Do they reverse at 90mph there Felix? 

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Memory’s hazy on the exact wording but it was US bumper regulations that drove the IB design. From 74 cars sold in the US had to be be able to withstand impacts of up to 5 mph into a fixed barrier, front and rear. Either without visible damage or without structural damage - not sure which. It was intended to reduce repair costs from minor prangs that generated disproportionately large bills but resulted in some very ugly solutions on previously elegant cars. Think 911, Merc SL and BMW 2002, to mention just a few. I guess for the 911 this seemed easier to achieve at the front as neither US nor RoW IB 911s have front overriders but both do at the rear with the US ones being bigger. Perhaps less space for bumper shock absorbers to do their thing and prevent engine damage so overriders were added? And from memory some of the bellows are subtly different between US and RoW cars.

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A few minutes on google suggests the regs were that there could be no damage to a car’s lights, safety equipment and engine in angled 5mph impacts.

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Does it depend on what was doing 5mph? Judging by the us over riders, a train? 

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