roger 04 rt
New member
On my R1150RT those are sealed indentations and not open to the intake manifold ... at least that's my recollection. Looks like a place to insert a screw for another option.
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Is there a FIX for Oil Head surging? 95' R1100R
- Thread starter james1300
- Start date
On my R1150RT those are sealed indentations and not open to the intake manifold ... at least that's my recollection. Looks like a place to insert a screw for another option.
happy wanderer
Day Dreaming ...
Interesting. Yet another tiny detail that is different on the 1100 and the 1150. See that nail in the hole there? It is 1.5 inches long and only half of that is sticking out from the hole (s) in my airbox. I did not make them. It came that way. I wonder why the 1100 has them and the 1150 does not?
happy wanderer
Day Dreaming ...
I think the confusion may be arising from a question in another thread where Pauls1150 asked Roger to take a look at post 59 and 60 in this thread. Roger responded. I responded. Anyway, it seems the holes or indentations are dead ended. In both models. 
pauls1150
MOA #24991, south of Los Angeles
Exactly correct; I asked in two places, and was answered.
Just for my own mental peace, I had to go check mine -
The holes are there but don't go through.
I don't recall if my 1150RS had them, and I sure as [heck] don't recall if my 1100 had them.
Very strange nonetheless.
I don't recall any option that might fit there.
Paul S
Just for my own mental peace, I had to go check mine -
The holes are there but don't go through.
I don't recall if my 1150RS had them, and I sure as [heck] don't recall if my 1100 had them.
Very strange nonetheless.
I don't recall any option that might fit there.
Paul S
scott.lambert
New member
smooth tops rule
SteveAikens
Proud Veteran
I rarely look at the Oilheads Forum so I'm pretty late to lunch. However, my very first question - that no one has asked - is why in the world are you lugging the engine down to 35 mph in 5th? Keep the engine/vehicle speed matched within the power band and unless there is a fairly significant problem with the engine [aka, porous heads for example] the bike should not surge.
Here's a link to some guidelines that may help.
http://www.nmpcs.com/r11r/
bikerfish1100
New member
Your right. It should not surge. However, BMW knows of the problem with the 94-96 R1100's.
I'm not riding around in 5th gear at 35 mph.
It surges (or did) coming from 70-75mph down to 35 and the surging would start in ANY gear.
It's a problem with Motronic's of that vintage.
The FIX for my 48 state R1100R is posted.
happy wanderer
Day Dreaming ...
"Should not surge" indeed. Surging has nothing to do with the power band and everything to do with closed loop fueling issues and cylinder to cylinder imbalance. These coupled with EPA laws that demand very lean fuel mixtures on big twins and you have surging issues galore. And it's not just
If you look at Snowbum's final solution to the surging on the 1100R in question he removed the O2 sensor and anything else to do with pollution control. Once you pull the cat code plug you have an ECU that is ignoring the O2 sensor anyway. The bike will then run with richer mixtures in open loop so of course it stops surging assuming everything else is in a good state of tune.
As for running the engine in low RPMs it's actually no problem whatsoever once you've enrichened the mixture by 4% to 6%. Then it will pull like a train at any RPM. Like a big twin should.
Approximately 1300 miles ago, I replaced the pink coding plug with a jumper between #30 and #87a as shown in post #16 of this thread. My 1998 R1100R runs much better since then - very good acceleration and no surging - much more fun to ride. The gas mileage improved from 45.87 to 46.59 . Like someone stated before, this was the cheapest and most effective modification I made to the bike so far.
bikerfish1100
New member
regardless of fueling concerns and adjustments, 35 mph in top gear would be lugging your motor, and that is not good for it. Can you get away with it? Probably. But why would you want to?
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