the 325iS: 635CSi

Thursday, September 13, 2012

1985 BMW M6 Euro VIN: BMW M88 DOHC 635CSi (Very rare Euro-spec M635 with VIN: WBAEE310701052093

Up for sale is my 1985 BMW M6 Euro. I have owned the car for over 2 years and have put somewhere around 12,000 miles on it since I bought it in 2009. It is my daily driver, and has never let me down. It was originally imported in 1985 and after purchase the first records that I have show it as a Texas car, where it remained until around 2006. No rust on this car. The Texas owner was a Porsche racing instructor and he installed a full Dinan Stage 4 suspension, including special Dinan/Bilstein shocks, Dinan springs, Dinan control arms/bushings, and Dinan sway bars. I have also owned an 87 US spec M6 and the difference between the Dinan suspension and stock is like a different world. The wheels are BBS RS 2-piece 17" As far as stereo goes the car has a Nakamichi head unit and Boston Acoustic speakers throughout. Rears have crossover with tweeters separate from mids, and the front speakers are Boston Acoustics Coaxials.

The only issue the early European M cars had was that the european M88 motor had a single timing chain which when pushed sometimes caused catastrophic failure. When BMW released the US spec M6 and M5 they upgraded the motor to dual timing chains. The engine in this car was replaced with a rebuilt 1988 M5 S38 dual timing chain block around 2006 when the chassis had at 86,000 miles. All other European parts were left on the vehicle other than the M88 ECU. It's got the Stainless Steel Euro headers and all the full Euro headlights,bumpers, and exhaust. The ECU was replaced with a Haltech 1000 EFI, which plugs in via USB to any windows laptop. It has increased the Horsepower and gas mileage greatly.

When I purchased the car I took it directly to a Haltech certified master technician(one of only a handful in the country) and had the car tuned, dynoed and tested. Then I shipped it out to the west coast, and drove it from LA to Eugene. I have a trusted reputable shop in Eugene and over the next few months a leak down was performed, compression was tested and everything checked out. The only thing they found was that the the crank hub had significant wear and it needed to be replaced as preventative maintenance. I got a polished, honed tested BMW OEM crank, and OEM crank hub(still waiting for the Frank Fahey hardened crank hub, he Takes his time). I had the entire motor pulled, the new crank and crank hub installed, also got a new pair of timing chains, tensioner, and new hardware for the setup directly from BMW. The necessary gaskets were replaced and the entire clutch, flywheel, and pressure plate were also replaced. All of that work was performed at 113k and the car currently has 122k and is super responsive and running great. (have all receipts:)

In the last 4 weeks Ive had a brand new OEM Bosch Starter installed. It has the very rare Rear headrests, which are very hard to find in 6-series. I'm sure there are tons of things I've missed but and more questions you can call me at Five4one- five1five-four6eightone

BMW M88 M635CSi E28 M5 Engine

The M88.1 engine was modified for use in the M635CSi and E28 M5, this engine was known as the M88/3.3 The Kugelfisher fuel injection was replaced with Bosch Motronic and the engine produced 286 hp (213 kW). The M88.3 was also fitted to the South African 745i, due to packaging problems with the turbocharged M102 engine which was used in other markets.

^{ON the S38 side there were also 3 versions:

The S38 was an updated M88/3 and produced in three versions :}
^{(1)    S38 B35 - US-spec BMW M5 (E28) and E24 BMW M6 and late-production catalyst-equipped European market M635CSi (260 DIN HP).

(2)    S38 B36 - all US-spec and '89-'92 European-spec BMW M5 (E34)

(3)    S38 B38 - '92-'96 European-spec BMW M5 (E34)}
^{The S38 B35 was a revision of M88/3 with dual-row
timing chain, reduced compression, catalyst-equipped and fitted with
tubular exhaust manifolds rather than equal length "bundle of snakes"
headers.}
^{For the S38 B36 displacement was enlarged from 3453 to 3535 cc. Thanks
to the use of a Bosch Motronic 1.2 engine management, power grew to 315
PS (232 kW/310 SAE hp) at 6900 rpm. a dual-stage intake plenum helped to
improve flexibility over the rev range. All versions were
catalyst-equipped.}
^{In 1992, with the introduction of Euro I emission legislation, BMW opted
to enlarge the engine once more, to 3795 cc, with power climbing to 340
PS (250 kW/335 SAE hp) and torque going up to 400 Nm (295 ft·lbf).
Coil-on-plug ignition replaced the traditional distributor from the B35
& B36. The B38 engine also received a Motronic 1.3 engine
management. This engine was used in the M5 until the E34 finished
production in 1996.}^[1]