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Search: Posts Made By: RGregor
Forum: Airheads Today, 09:40 AM
Replies: 31
Views: 836
Posted By RGregor
No, not the only ones. Since my second bike, a...

No, not the only ones.
Since my second bike, a 90/6, all my engines had dual plugging.
OK, one exception: the one with the Krauser heads had only one central plug.

My current engine has 1070cc,...
Forum: Airheads Today, 09:21 AM
Replies: 31
Views: 836
Posted By RGregor
Interesting table. So the octane number...

Interesting table.
So the octane number mentioned here for the US are AKI numbers?
Forum: Airheads Today, 06:37 AM
Replies: 31
Views: 836
Posted By RGregor
Good to hear these pistons work so well. The...

Good to hear these pistons work so well.
The shape of the dome reminds me of the pistons Udo Gietl used in his racers in the 70s.
Forum: Airheads 05-01-2015, 01:39 AM
Replies: 8
Views: 487
Posted By RGregor
Sorry, I remembered it wrong. Just checked, they...

Sorry, I remembered it wrong. Just checked, they specify timing at the tappet. They do give max lift numbers at the valve, calculated by a fixed rocker ratio of 1.4. Obviously I mixed that up.

My...
Forum: Airheads 04-30-2015, 10:15 AM
Replies: 8
Views: 487
Posted By RGregor
Hallo, interesting topic. Thanks for the...

Hallo,

interesting topic. Thanks for the data.
I'm not sure I understand what you mean with "in" and "out".
When I screw the adjuster completely into the rocker, which means towards the nut, is...
Forum: Airheads 04-24-2015, 07:15 AM
Replies: 8
Views: 457
Posted By RGregor
They won't fit, the /5 shafts are thinner. ...

They won't fit, the /5 shafts are thinner.
You'd need the complete set.
Forum: Airheads 03-28-2015, 06:22 AM
Replies: 32
Views: 1,154
Posted By RGregor
Thanks.

Thanks.
Forum: Airheads 03-28-2015, 04:59 AM
Replies: 32
Views: 1,154
Posted By RGregor
Sorry, what is tickover?

Sorry, what is tickover?
Forum: Airheads 03-28-2015, 04:20 AM
Replies: 32
Views: 1,154
Posted By RGregor
My first experience with dual-plugging was with...

My first experience with dual-plugging was with my first airhead.
It had an R75/5 engine and when really hot it did ping severely.
Despite the leaded high octane fuel of that time.
I converted it...
Forum: Airheads 03-28-2015, 04:10 AM
Replies: 32
Views: 1,154
Posted By RGregor
Thanks. I'd say these piston should be used with...

Thanks. I'd say these piston should be used with either these early heads or modified R80 heads.
Where did you buy these rockers?
What ratio do they have?
Forum: Airheads 03-28-2015, 02:53 AM
Replies: 32
Views: 1,154
Posted By RGregor
What heads do you use with these pistons?

What heads do you use with these pistons?
Forum: Airheads 03-23-2015, 04:15 AM
Replies: 21
Views: 1,286
Posted By RGregor
My father tried this on his '74 /5. Yes, the...

My father tried this on his '74 /5. Yes, the rings were movable,
After that they simply were loose. He had to fix them with some hose clamps afterwards.
I'd replace the rubber seals and if depth of...
Forum: Airheads 03-22-2015, 01:59 PM
Replies: 74
Views: 3,826
Posted By RGregor
Best option so far ...

Best option so far ...
Forum: Airheads 03-22-2015, 01:04 PM
Replies: 74
Views: 3,826
Posted By RGregor
The asymmetric cam puts a bit more stress on the...

The asymmetric cam puts a bit more stress on the valve train, especially on the intake side.
So maybe lighter retainers would be a desirable add-on.
Forum: Airheads 03-22-2015, 12:58 PM
Replies: 74
Views: 3,826
Posted By RGregor
The BMW Online shop quotes ~310 for a new cam...

The BMW Online shop quotes ~310 for a new cam and four new lifters.
http://shop.bmw-classic.de/index-ClassicDE-WFS-de_DE-EUR.html
Forum: Airheads 03-22-2015, 05:36 AM
Replies: 74
Views: 3,826
Posted By RGregor
If you don't want a performance upgrade then...

If you don't want a performance upgrade then there's no better option than to use a stock cam.
You can use any late style cam from R80 up to R100 engines.
On german ebay they're sold in good shape...
Forum: Airheads 03-17-2015, 09:27 AM
Replies: 10
Views: 553
Posted By RGregor
I don't think you would see this on the oil...

I don't think you would see this on the oil pressure light.
I don't even think it will affect oil pressure much. The front bushing is fed by a calibrated line and the rear isn't fed at all.
Forum: Airheads 03-17-2015, 06:44 AM
Replies: 10
Views: 553
Posted By RGregor
Could it be a problem with the cam...

Could it be a problem with the cam bearings/bushings?
If they are worn, the cam would be pressed to the opposite side when the intake valve is opened.
I have heard of engines where the rear cam...
Forum: Airheads 03-17-2015, 03:48 AM
Replies: 30
Views: 3,300
Posted By RGregor
Another thought: if the left side cylinder is off...

Another thought: if the left side cylinder is off and you spin the cam you should see oil coming out of the escapes at the con rod.
If the con rod is fed and the galleries not, the error must be in...
Forum: Airheads 03-16-2015, 12:28 PM
Replies: 30
Views: 3,300
Posted By RGregor
Hi Greg, you rebuilt that engine yourself? ...

Hi Greg,

you rebuilt that engine yourself?
What did you do overall? Changed main bearings, too?

First thing that comes into my mind is, forgive me, that you might have forgotten to drill the...
Forum: Airheads 03-12-2015, 01:58 AM
Replies: 12
Views: 601
Posted By RGregor
If it works with the R80 heads than you should...

If it works with the R80 heads than you should give it a try.



If you look at late (post '78 :-)) ) R100 heads, that's what I tried to describe.
Forum: Airheads 03-11-2015, 02:58 PM
Replies: 12
Views: 601
Posted By RGregor
Do you know how they would have to be machined? ...

Do you know how they would have to be machined?
At a diameter of 95mm there should be a step, 1mm deep.
Then a 18 taper inwards.
The R100 heads do have a radius from the taper to the spherical...
Forum: Airheads 03-11-2015, 09:54 AM
Replies: 12
Views: 601
Posted By RGregor
If you want to be on the safe side, buy some...

If you want to be on the safe side, buy some clay, put it on the pistons and turn the engine around once. Then you'll see how close the pistons come to the heads and how the contour looks like.
If...
Forum: Airheads 03-10-2015, 10:02 AM
Replies: 74
Views: 3,826
Posted By RGregor
There has been a series of cam followers where...

There has been a series of cam followers where these problems occured quite often.

You may be lucky, but the pieces missing may have been succed into the oil pump. So in any case you should...
Forum: Airheads 03-10-2015, 09:55 AM
Replies: 74
Views: 3,826
Posted By RGregor
Look on the front side of the cam, there you...

Look on the front side of the cam, there you shoud see a 308 or 336 if it's a BMW cam.

This number tells how long the valves are opened by the cam lobes. The angle between the lobes is due to...
Forum: Airheads 02-23-2015, 05:24 AM
Replies: 32
Views: 1,621
Posted By RGregor
Hello Charles, Thanks for the info, for sure...

Hello Charles,
Thanks for the info, for sure that makes it very interesting.
Best regards, RG
Forum: Airheads 02-23-2015, 01:27 AM
Replies: 32
Views: 1,621
Posted By RGregor
Hello Charles, I have no experience with...

Hello Charles,

I have no experience with these units.
A lot of the users in the 2-Ventiler forum use the unit from Joerg Hau and give positive feedback.
I don't need one, I have a Motogadget...
Forum: Airheads 02-22-2015, 09:16 AM
Replies: 32
Views: 1,621
Posted By RGregor
Hello Charles, over here these units are...

Hello Charles,

over here these units are very popular:
http://jhau.maliwi.de/mot/voltmeter.html

Best regards,

RG
Forum: Airheads 02-17-2015, 11:18 AM
Replies: 7
Views: 679
Posted By RGregor
One question in advance. You have checked valves...

One question in advance. You have checked valves and ignition?
You shouldn't try to fix a problem with carbs when the reason is somewhere else.

For the problem you describe you'd have to change...
Forum: Airheads 02-17-2015, 08:01 AM
Replies: 7
Views: 679
Posted By RGregor
These bikes suffer from low CR and a rich carb...

These bikes suffer from low CR and a rich carb setup.
In a BMW related magazine there was a very interesting article on how to improve mileage with these bikes.
However, it's not only buying the...
Forum: Airheads 02-15-2015, 01:48 AM
Replies: 15
Views: 762
Posted By RGregor
That fit's to your diagnosis. You could try the...

That fit's to your diagnosis.
You could try the AR atomizers or different pump jets.
I installed smaller pump jets, so the pump works longer but enrichens less.
You could test the opposite.

I...
Forum: Airheads 02-15-2015, 01:27 AM
Replies: 15
Views: 762
Posted By RGregor
Do you have the pumps? Does the pinging occur...

Do you have the pumps? Does the pinging occur instantly or after a few seconds?

To get a bit richer mixture during acceleration I installed AR atomizers.
AR264 at the moment AFAIR.
They are...
Forum: Airheads 02-15-2015, 01:16 AM
Replies: 15
Views: 762
Posted By RGregor
How did you check that it's too lean? And was...

How did you check that it's too lean?
And was it during constant throttle/rpm or during acceleration?
Forum: Airheads 02-14-2015, 05:12 AM
Replies: 15
Views: 762
Posted By RGregor
Hello, on my bike the 90S jetting was far...

Hello,

on my bike the 90S jetting was far from being good.
Too rich at idle, becoming far too lean between idle and 1/4, between 1/4 and 3/4 becoming far too rich and then at WOT high rpm it was...
Forum: Airheads 04-05-2014, 02:22 PM
Replies: 159
Views: 7,233
Posted By RGregor
Now that is a really good one. We are talking...

Now that is a really good one.
We are talking about your profession and my hobby, and even here you are no match.

So how does shortening a spring and adding a spacer reduce travel?
Let's look...
Forum: Airheads 04-05-2014, 01:36 PM
Replies: 159
Views: 7,233
Posted By RGregor
No Mr. Brick, I am talking about forks. If...

No Mr. Brick,

I am talking about forks.
If you don't realize, that fork travel will be reduced by shortening the spring, you should stop talking about things you obviously don't understand.
...
Forum: Airheads 04-05-2014, 06:38 AM
Replies: 159
Views: 7,233
Posted By RGregor
Sorry man, but you say stiffness and mean...

Sorry man,

but you say stiffness and mean something else. You say energy and mean force.
How can we be sure we are talking about the same thing when we say "fork"?

When you discuss technical...
Forum: Airheads 04-05-2014, 06:21 AM
Replies: 159
Views: 7,233
Posted By RGregor
Hello, I don't get that: If I...

Hello,

I don't get that:


If I shorten a spring to half length, combine it with a solid spacer and I apply a certain force, this shortened spring will make half travel vs. the original spring....
Forum: Airheads 04-04-2014, 11:12 AM
Replies: 159
Views: 7,233
Posted By RGregor
Hello again, just reflected on that...

Hello again,

just reflected on that statement:



Shortening will increase the rate and reduce travel. However, coil bind will occur at exactly the same force applied as with the unshortened...
Forum: Airheads 04-04-2014, 10:59 AM
Replies: 159
Views: 7,233
Posted By RGregor
Hello! One question regarding this: ...

Hello!

One question regarding this:



How did you measure your sag?

Best regards, RG
Showing results 1 to 40 of 471

 
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