Hello all.. ALPINA fans,, not ALPINA fans ,, M30 enthusiastics,, Turbo fans .. etc etc
Recently i took my engine out of my B10 BT ,, my favorite car of all time
ALPINA B10 BITURBO
The reason ,,
after i took of the valve-cover to have an inpection, i discovered that the camshaft was really worn,, worst on cyl 1, the reason == one of the banjobolts ((2 of them)) got loose ,,so the oilpressure was not optimal,, and the cam got screwed up,,
well i decided to also change ALL bearings in the bottom of the engine ,, so lets start the thread
All parts were cleaned as well as i could,, underneath and inside
Engine and gearbox came out.....
It came as a result that the crankshaft was worn 5/100 of a mm ,,ALL MAIN BEARINGS,, from 1-7 and also conrod bearing 1-6
so a turn of a 0.25 mm was the conclusion,, that was taken ,,
the backlash of the crank was over 1.0mm and that is not uncommon on a car with heavy clutch.. an Automatic M30 can drive to the moon without a backlash-problem
all seals,, gaskets,,bought new from GOETZE ..Federal-Mogul - Goetze Cylinder Head Gaskets
bearings ,, was from CLYCO
and i decided to buy from ........ BMW Performance Parts, BMW Race Engines, BMW Service, Auto body, and Original Parts
the cylinder head was shaved 0.10mm
MLS 0.70" /1.778mm headgasket and ARP studs,, IMO the best available on the market,, and a good value for money,,
pistons were like new and cylinder walls also,
pistons are oem ALPINA/Mahle..
As you can see
3.5L ,,,,,,,,,,,7.2 cr ,,,,,,,,,,,,, and B10
Here is an intake port from an oem 3.5L M30.. the gasket is from my engine ...... some difference as you can see
ALPINA engine mounts on the exhaust side,,, NOT oem M30 BMW
M70 starter (( a lot more powerful vs oem M30 and makes the most gorgeous starting sound ever made))
ALPINA B10 BITURBO engine code........... B7/5 and the nr of the car ((0346))
This is not cool ... this is GLACIER cool,, i am a big fan of number matching things
the conrods,,,,,,,,,, is this an oem M30 conrod mark ??
B5,,,,,,,,,,,, i the ALPINA ETK,, the PLEUL(conrods) are not even mentioned ??
Ok,, fastening down the Cylinder head,,,
MLS studs on .,,
OIL pump .. and timing OK,,
On the B7/5 engine ,, the rocker-arms are strength tested,, and radio-achtivated,, then numbered
,, the result is like this..
The intake port.......
OIL drain,, and coolant drain ((2)) on exhaust side
I think oem ,, because on the other M30B35 the port was very similair
TURBO,,, both turbos were disambled,, cleaned up.. the rear manifold had 2 cracks,, ((not uncommon on a B10 BT)),, my friend who have a VERY big experience with turbos ,, was stunned how the condition was ,, the front turbo had a small backlash,, but bearings and seal was OK,,,,,
((wtf,,,,,,,,, a welding line... yes ))
Here you can see the main reason for special refabrication on engine mounts on the exhaust side
ALL KINDS of shields,,, and a stunning engineering IMO,, and thought all way through
Just for you,,, and NOT USEFUL information,,
ALPINA and M/// Gmbh share almost nothing in common,, back in the days when M/// motorsports were producing M49 in the E9.. one of the greatest 6 cyl racing engine ever created,, ALPINA went in to a different way,, they started to BLOW some big sixes,, and the result was a lot more than impressive.. the E28 B7 is IMO the best turbocharged ALPINA car they made ... not the greatest,, but proberbly the best,, why is that,, because,, this car do not suffer for such a violent heat problems that can cause the B10 BT.. when the B7 was made ,, the B10 BT was not made and the 24v technology was not ,,then, gone into production by BMW ,, so the B10 BT is the last dinosaur,, ALPINA made.. a ,,very very
spectacular car made from the old M30 design with the best technology that day,, but sadly .. so much money spent on an old engine,, a 12v that was in the heyday,, if ALPINA had licence to use the M88/S38 or even the new m50 24v as a start.. the result could easily been 450 ps (( remember that S38 is just a developed M30 with a 100+ ps top))
More to come,,,,,,,