Thanks for that. Fairly extensive googling fails to give me a
definite answer, and I know that there isn't a common standard for
cylinder numbering of V engines. I'll go with the right side O2
sensor, and see what happens.
On Sun, 9 Jul 2006 23:34:03 +0100, "R. Mark Clayton"
I'm looking for bank numbering. I'm not sure what the firing order
has to do with it.
In spite of everything, I'm going with bank 1 being on the right. I
think it's a good bet and if I'm wrong, then I'll just have to get
under the damned car again and swap it.
Well, according to Bentleys, No1 cyl is definitely on the right when facing
the front of the engine.
Dunno what others are on about but AFAIK cylinder numbering 'always' starts
from the front of an engine. The front being the end with the pulley for the
ancilliaries. Fan, alternator etc.
On Fri, 14 Jul 2006 00:25:18 +0100, "R. Mark Clayton"
I once carelessly put a distributor back into a 4 cylinder engine 360
degrees out of whack, and plonked the existing distributor cap and
plug leads back on it. When I eventually figured out what the problem
was, I had one of those rare moments of inspiration and just changed
the plug wires around instead of taking the damned distributor back
out and repositioning it.
Pray tell how anyone could tell which was # 1 cylinder on that car
just from the plug leads, either before or after I'd messed with it.
I'm happy to report that my doings with O2 sensors appear to confirm
that cylinder bank 1 - 4 is, in fact on the right. And I wasn't daft
enough to mess with the plug wires or anything like that this time.
I just found that the ETK parts manual numbers the cylinders 1 to 4 on
the right side and 5 to 8 on the left side. That matches the fault
code descriptions of "cylinder bank 1 - 4" and "cylinder bank 5 - 8,"
so I think that's what I'll go with.
Now the only question is, which side is left and which is right. The left
side of the motor is on the left side of the car when sitting in the driver
seat, or standing at the back and looking forward. The driver's door is the
left door, and so on. The left side of the motor is NOT the left side as you
stand at the front of the car and look into the engine bay.
1 to 4 is normally on the left side, and 5 to 8 on the right.
On Mon, 10 Jul 2006 06:51:41 -0700, "Jeff Strickland"
Well, according to the ETK, 1 to 4 cylinders are on the right and 5 to
8 are on the left. The four exhaust manifolds each go to cylinders 1
& 3, 2 & 4 on the right, and 5 & 6 and 7 & 8 on the left. My
inclination would be to number the cylinders in crankshaft order from
front to back, but that doesn't seem to be the way that BMW does it.
Oh, and I'm assuming there that you wouldn't have the same confusion
over which is the front and back of the car as you possibly might seem
to have over which is the left and the right :-)
There is only one left, and one right, when referring to a vehicle.
Left and right are ALWAYS from the driver's seat.
The LEFT side of a vehicle in the US usually contains the steering wheel.
The LEFT side of a vehicle in Great Britain usually contains the passenger
When one is standing at the front of the car (why, oh why, did BMW go away
from the rear opening bonnet/hood?), the LEFT side of the car is still the
side that has the steering wheel in the US, or the passenger seat in the UK.
Yes, you smart arses, there are exceptions if there is a RHD car in America
or an LHD in the UK.
The easy way to remember banks, and/or cylinder numbering in a BMW is this.
What side of the car did you need to stand on to remove the spark plugs from
a 1970's 4 or 6 cylinder BMW? The RIGHT hand side. The cylinder number is
1 to 4, or 6, starting at the front. So, cylinder number 1 is the forward
most cylinder on the RIGHT hand side of the car. Go back from there. When
you run out of cylinders, move to the LEFT side. The even/odd numbering
system is an American V8 trait that has probably made it's way into various
European models, but not BMW.
V8, cylinders 1 through 4 are the RIGHT bank, cylinders 5 through 8 are the
LEFT bank. V12, 1-6 RIGHT, 7-12 LEFT.
To add a little confusion, in a 6 cylinder car, if there is a reference to
Bank 1, and Bank 2, bank 1 is the first 3 cylinders, bank 2 is the back 3
Hope this helps.
KMS - Koala Motorsport
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.