My 'new' W108

I'll update this as I dig into it, but I've got bigger projects now so she'll only get attention when I'm frustrated with another
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also - i think weistec is doing a 108 too -
The Best of Mercedes & AMG
For now, I'm looking into running a stock reproduction 6.3L exhaust for this thing from the big, mid muffler section rearward...

Won't sound stock with the 302 but I think it'll offer an interesting presence.
It'll be static low with the stock steelies/hubs for now. Any money to this old girl will be spent on the swap before suspension.
also - i think weistec is doing a 108 too -
Been out of town since right after I picked this up, I'm actually anxious to get back there and at least start cleaning
And thanks everyone else! It'll be slow for awhile, but I'll post progress when I have it
Last edited by rockthemullet; May 19, 2014 at 12:44 PM.

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The W109 300SEL 6.3 marked Mercedes-Benz "unofficial" return to racing after the 1955 Le Mans tragedy with a brief, but successful racing history winning at Macao and finishing 2nd overall at the 1971 24 hours of Spa only because car required extra refueling stops. The W109, fondly referred to as the "Rote Sau" (Red Pig) heralded the beginning of AMG.
The story behind the 300 SEL 6.3 should seem pretty familiar to most American muscle car fans. A maverick engineer with racing ties secretly takes a great big engine from another application (in this case, a 6.3-liter V-8 from a limousine), and stuffs it into some poor, innocent midsize sedan (a 300 SEL that started out with a 3.0-liter inline-six). The engine is re-engineered with high-performance parts, and the suspension and chassis are modified to handle the weight and power. A limited number of theses absurdly complicated, powerful and expensive vehicles are then unleashed on an unsuspecting public. That engineer was Erich "Hot Wax" Waxenberger at the Daimler-Benz experimental department. Developed in 1960, the engine is designated 100.981, and is commonly referred to as the M-100. This was Mercedes' first production V-8. The engine technology came directly from Mercedes' 1950’s Grand Prix 300SLR "Silver Arrows". It is highly sophisticated and durable with single-overhead cams, a nitrided crankshaft, seven main bearings, sodium-filled valves, hardened valve seats and molybdenum-coated piston rings. Normally aspirated with direct, timed mechanical fuel injection and dual plenums with tuned ram air induction and massive oil cooler. A very similar system can be seen on all of the 300SLR race cars of the mid 1950’s.
Another of the more advanced aspects of the car is its self leveling air suspension. The forerunner of the Airmatic system. Four air chambers with bellows replace steel springs, pressurized at up to 228 p.s.i with a recirculated alcohol/air mixture fed from an engine-driven compressor.
A ZF limited slip differential incorporates it’s own oil cooler. Full independent suspension with anti-dive technology and the first production car ever with 4 wheel ventilated disc brakes and fitted with rare 15" wheels.
The ground-up restoration of my W109 took more than 20 years to complete requiring 2 donor cars. The rust free roller was a rare non-sunroof unit. The engine has been increased to 6.5 liters with re-profiled camshafts and minor modifications to the injection system. 0-60 times run about 5 seconds.




Last edited by AgSilver; Aug 27, 2016 at 12:33 PM.

The W109 6.3 K4-50 transmission was designed to be suitable for road racing and completed the 1971 24 hour race at Spa where the W109 finished 2nd only because of the number of fuel stops required. The shift times are about the same as the current DB 7 speed. It is connected to the engine with a lock-up fluid coupler which disengages with a slight jerk when coming to a full stop. The '68-'69 6.3's are not particularly quiet as there was little sound deadening. On the inside is sounds like a machine shop on wheels.
Here it is on a demo run:
Last edited by AgSilver; Aug 29, 2016 at 04:31 PM.










