1984 E28 Hartge H5SP Prototype. For Sale
This is a fully 'patina' restored Hartge H5 SP originally purchased from Sewell of Dunmow (BMW Dealer) in its current Hartge specification, during early August 1984 by the owner of an Engineering company based in Braintree. The vehicle was originally imported into the UK by BMW dealer Barons of Stansted in January 1984 as a 528i SE and sent to Uk Hartge concessionaires Griffin Motorsport of Swindon for the H5 SP conversion to be undertaken. The vehicle arrived with me in late 2011 via its 3rd owner, who had owned the car since 1992 and had stored it in an un-weather proofed barn for around 15 years. Over the next two years, the vehicle was pain-stakingly restored from the ground up. Over 500 hours of labour were recorded, as every single physical aspect and mechanical system on the car were renovated or replaced to bring the car back to its former glory, without compromise. The specification of the car is highly unusual when compared to other existing Hartge H5SP models. It was built before the normal Motronic injected 3430cc M30 B34 found in later SP models was available from BMW. Instead it is fitted with the earlier L-Jetronic injected 3453cc M30 unit similar to the E12 M535i and early E24 635 CSI. Under close inspection of the engine, during its rebuild, it was noted that both the cylinder head and cylinder block carry Hartge H5S identification marks, but internally there were some subtle differences from the Hartge H5S (240 bhp) specification. The flat-topped Mahle pistons not only sported some unusually thin piston rings, it was also found that the gudgeon pin positions in the pistons were around 1.5mm lower than those found in all other 3453cc M30s, resulting in an increased compression ratio over the standard 10:1 ratio found in the H5S. Moreover, when the original camshaft was inspected it was found to have an increased inlet lobe lift of 1mm and around 8 degrees more dwell than the 272 degree cam found in other Hartge H5S M30 engines of this age. Due to a change in personal circumstances, the owner who had originally instructed the restoration, now cannot afford to settle his account, so this rarest of E28 examples is looking for a new home. Overall the car is 99% complete, it is unfortunately missing its original Hartge steering wheel and gear knob, which the 3rd owner removed during the mid-90s to send to an automotive trimming specialist for restoration, but were apparently lost subsequently during a house move. Currently the vehicle has covered less than 15 miles since its completion and is offered for sale with a brand new 12 months MOT. Viewing is by arrangement only at our Devon facility, 5 miles from J25 on the M5. If you have any questions with regards to the vehicle, please do not hesitate.
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