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Search: Posts Made By: RGregor
Forum: Airheads 04-05-2014, 02:22 PM
Replies: 159
Views: 5,053
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: 5,053
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: 5,053
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: 5,053
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: 5,053
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: 5,053
Posted By RGregor
Hello! One question regarding this: ...

Hello!

One question regarding this:



How did you measure your sag?

Best regards, RG
Forum: Airheads 04-04-2014, 10:58 AM
Replies: 159
Views: 5,053
Posted By RGregor
Hello! I understand that perfectly and think...

Hello!

I understand that perfectly and think it's all true. Sorry, I shortened it so that this post doesn't get too long.



Still I don't understand the statement that started all this...
Forum: Airheads 04-02-2014, 09:42 AM
Replies: 159
Views: 5,053
Posted By RGregor
Hello Henry, the fact that you question...

Hello Henry,

the fact that you question yourself is the key.
Others don't do that.
Those are the people who may call themselves "brick" if they want.
Don't know if Jim is one.

Best regards...
Forum: Airheads 04-02-2014, 01:39 AM
Replies: 159
Views: 5,053
Posted By RGregor
Hello Henry, no need to explain that to me,...

Hello Henry,

no need to explain that to me, I know you're right.
You will agree that the mathematics behind that is simple enough.
I simply wanted to point out that for anyone not caring about...
Forum: Airheads 04-01-2014, 03:42 PM
Replies: 159
Views: 5,053
Posted By RGregor
Hello, seems to me you're not understanding...

Hello,

seems to me you're not understanding each other.
The arguments about spring behavior with or without preload are true.
The problem of understanding from my point of view is, that from...
Forum: Airheads 02-24-2014, 02:59 AM
Replies: 45
Views: 3,001
Posted By RGregor
Hello, three points come to my mind...

Hello,

three points come to my mind regarding this:
1. the boxer engine is more critical regarding pump losses
2. the boxer engine is more critical regarding oiling issues as gravity doesn't...
Forum: Airheads 02-24-2014, 02:52 AM
Replies: 7
Views: 583
Posted By RGregor
Hello Rob, this could be a Maico fork. ...

Hello Rob,

this could be a Maico fork.
Often used in that era.

Best regards,
RG
Forum: Airheads 02-02-2014, 12:56 AM
Replies: 162
Views: 11,700
Posted By RGregor
Hello, with all that biased data you'll need...

Hello,

with all that biased data you'll need some extension for your Kalman filter.
Although, predicting some reactions here is very easy.

BTW, what does the 10% axiom say?

Best regards, RG
Forum: Airheads 01-30-2014, 08:34 AM
Replies: 32
Views: 2,083
Posted By RGregor
Hello Adrian, the stock con rods are forged...

Hello Adrian,

the stock con rods are forged units, too.
Probably they are not that strong as the Moorespeed units.

Best regards,
RG
Forum: Airheads 01-27-2014, 10:48 PM
Replies: 32
Views: 2,083
Posted By RGregor
Hello! Ah, I see. Thanks. Best regards,...

Hello!

Ah, I see. Thanks.

Best regards, RG
Forum: Airheads 01-27-2014, 11:17 AM
Replies: 32
Views: 2,083
Posted By RGregor
Thanks

Hello,

thanks for your replies.

@Moorespeed: I'll call you via phone.

@Jon-Lars: silly question, the buttons on the image between cam and cylinder, what are they for?

@bmwrench: Wizemann...
Forum: Airheads 01-26-2014, 12:31 PM
Replies: 32
Views: 2,083
Posted By RGregor
Carillo con rods for airheads

Hello,

does anyone know, if or where Carillo con rods are available?
In stock length and for stock bearings.

Thanks in advance and best regards

RG
Forum: Airheads 01-19-2014, 08:45 AM
Replies: 11
Views: 752
Posted By RGregor
Hello, for single spark the ignition curves...

Hello,

for single spark the ignition curves eight or nine may be fine.
The original ignition ends at 32, that would be curve 8 for a static advance of 6.

Sorry, I don't have personal...
Forum: Airheads 01-17-2014, 05:58 AM
Replies: 11
Views: 752
Posted By RGregor
Hello, I have two recommendations: 1. Tell...

Hello,

I have two recommendations:
1. Tell us, which ignition module you have. The curves differ sgnificantly from version to version.
2. Use a different color for your text.

Best regards,
RG
Forum: Airheads 01-16-2014, 04:54 AM
Replies: 41
Views: 3,213
Posted By RGregor
Hello Joper, sorry for that result. From...

Hello Joper,

sorry for that result.
From the image it's hard to tell how bad the scratches are.
You could just replace the pump (and clean the oil passages, remember) and check oil pressure of...
Forum: Airheads 01-10-2014, 11:19 AM
Replies: 41
Views: 3,213
Posted By RGregor
Hello, Do you want to see a picture of my...

Hello,

Do you want to see a picture of my oil pump?
I didn't keep the engine housing, but the pump. Just for the looks.
If you see the pump, you know what the opposite side looked like.

Best...
Forum: Airheads 01-10-2014, 09:09 AM
Replies: 41
Views: 3,213
Posted By RGregor
Hello, the oil pump is the first system in...

Hello,

the oil pump is the first system in the chain, so the filter won't help here.
The pump housing and the pump for sure are damaged.
The pieces fall into the oil pan, they are sucked into...
Forum: Airheads 01-02-2014, 09:14 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello, according to an article in the...

Hello,

according to an article in the "Sonderheft BMW Motorraeder" [1] the balancing factors of the BMW stock engines are:
R75/R80: 30%
R100: 25%
R60: 40%

The balancing factor for a boxer...
Forum: Airheads 01-02-2014, 08:22 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello! The Siebenrock kits have been...

Hello!

The Siebenrock kits have been designed and are advertised as plug&play.
So rebalancing is no must, but an option.
In fact, I only would do it if I knew a good shop for that job.
When...
Forum: Airheads 01-02-2014, 12:41 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello, the pistons (incl. the pin) of my...

Hello,

the pistons (incl. the pin) of my Siebenrock Replacement kit weigh 600 grams.
That's around the weight of R80 pistons.
The later BMW cranks are all the same and rumor says they are...
Forum: Airheads 12-31-2013, 12:56 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello, yes it does. If it's not the latest...

Hello,

yes it does. If it's not the latest R80GS head you should see, looking onto the head from the head gasket side, R9 or L9. The R100 (except the R100GS and R100R) heads have an R/L10 here. I...
Forum: Airheads 12-30-2013, 11:02 PM
Replies: 31
Views: 1,984
Posted By RGregor
Hello spo, bmwrench is right, the heads are...

Hello spo,

bmwrench is right, the heads are the same. Same casting, thus same combustion chamber, you use even the same heads gaskets.
So just replacing cylinders and pistons will work.
The 20%...
Forum: Airheads 12-30-2013, 11:38 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello, that for sure makes your situation...

Hello,

that for sure makes your situation special.
But it does not affect the risk of cracking your case.
Maybe you're lucky, too.

Best wishes,

RG
Forum: Airheads 12-30-2013, 12:54 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello spo, I didn't swap heads. The heads...

Hello spo,

I didn't swap heads. The heads are the same except for the 40mm ex valves of the 90/6. Which are oversized imho.
The engine ran fine, no question.
But it was a low-budget effort. And...
Forum: Airheads 12-29-2013, 10:32 PM
Replies: 31
Views: 1,984
Posted By RGregor
No, I don't remember.

No, I don't remember.
Forum: Airheads 12-29-2013, 10:22 PM
Replies: 31
Views: 1,984
Posted By RGregor
For the looks.

For the looks.
Forum: Airheads 12-29-2013, 11:43 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello, if that's the problem, fitting...

Hello,



if that's the problem, fitting the old timing chain cover on a new case is very simple.

Best regards,

RG
Forum: Airheads 12-29-2013, 08:15 AM
Replies: 31
Views: 1,984
Posted By RGregor
Hello! The engine cases have been...

Hello!

The engine cases have been strengthened several times over the years.
In the front and rear main-bearing area.
If you like register at www.2-ventiler.de (http://www.2-ventiler.de) and...
Forum: Airheads 12-12-2013, 07:54 AM
Replies: 27
Views: 1,831
Posted By RGregor
Hello! In case you remove material, the...

Hello!

In case you remove material, the crank needs to be rebalanced.
And the balance factor needs some attention, as it is changed when you remove weight from the counterweights or the...
Forum: Airheads 12-02-2013, 01:58 PM
Replies: 86
Views: 10,427
Posted By RGregor
She said that she realized only after completion...

She said that she realized only after completion that it might be a problem to get the bike out of the house.
If I remember right she then lived on the fourth floor.
She made it ...
Forum: Airheads 12-02-2013, 08:09 AM
Replies: 86
Views: 10,427
Posted By RGregor
Jutta Kleinschmidt: ...

Jutta Kleinschmidt:
http://www.jutta-kleinschmidt.de/wp-content/uploads/2013/02/1.png

In a presentation she said she didn't know what one mark in the roadbook should mean. Afterwards she knew ......
Forum: Airheads 11-16-2013, 08:02 AM
Replies: 11
Views: 1,039
Posted By RGregor
Thanks!

Thanks!
Forum: Airheads 11-16-2013, 12:52 AM
Replies: 11
Views: 1,039
Posted By RGregor
Hello, my Siebenrock replacement kit...

Hello,

my Siebenrock replacement kit cylinders have the same "S" marking on the top side of the cylinder base. Probably stands for "S"iebenrock?
And: on the opposite (bottom) side of the cylinder...
Forum: Airheads 10-20-2013, 04:15 AM
Replies: 64
Views: 3,294
Posted By RGregor
Hello, the calculation in the link above is...

Hello,

the calculation in the link above is simple maths.
Don't know if it's a 100% correct either.
I cross-checked it to the diagrams, that are around. And to my own speed measurements with...
Forum: Airheads 10-20-2013, 03:28 AM
Replies: 64
Views: 3,294
Posted By RGregor
Hello, with the long fifth, a 33:11 FD and a...

Hello,

with the long fifth, a 33:11 FD and a 130/80-18 rear tire 7000 are around 200 km/h....
Showing results 1 to 40 of 437

 
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