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Messages - Ralf89

Pages: [1] 2
1
Identify these bikes! / Re: Strange JAP cylinder
« on: December 23, 2025, 10:29:07 AM »
Hi,
thank you for your answer and sorry for my late response.
I want to use this engine in an motorcycle of a almost unknown small austrian brand called D.S.H. They used all kinds of Villiers and JAP engines, and this engine would fit perfectly in the frame.
Thanks
Regards
Ralf

2
Identify these bikes! / Re: Strange JAP cylinder
« on: December 15, 2025, 01:29:50 PM »
According to my research most of the cheap "Roadster" engines (IY, KY, LY and UY) hasn't thr oilbox. Many old pictures of that time confirm this.
Only the sporty SV engines and all OHV engines had the oilbox.
I am pretty sure that this engine is from 1927 and not post war. Because the crankcase from the 30's onwards lokks different (small cooling fins on the crankcase).
But many thanks for your Input

Regards
Ralf

3
Identify these bikes! / Re: Strange JAP cylinder
« on: December 13, 2025, 08:44:01 PM »
Hello
Many thanks for your response!
You are absolutely right- I am from Austria and I found this engine also here in Austria. As far as I know the 550cc engines where very popular in Germany and maybe also here in Austria. According to my research the "Y" on SV engines stands for the cheaper "Roadster" or "Standard" version. They has smaller valves and no rotary breather than the sporty SV K and U engines.
So far so good. But my problem is as mentioned before the fact, that normally the KY and LY engines has the sparkplug located directly on the intake valve cap, but my engine has a seperate hole for the sparkplug like the sporty K and U SV engines. But with the small valves and tiny cooling fins.
Very confusing....
Maybe it is really a industrial engine...
Thank you.
Regards
Ralf

4
Identify these bikes! / Strange JAP cylinder
« on: December 07, 2025, 07:16:51 AM »
Hi,
Has anyone every seen such a Roadster cylinder with seperate sparkplug hole like the SV sports engines K and U?
Furthermore this cylinder has very tiny but many cooling fins.
This cylinder was mounted on a 550cc Roadster engine from 1927 ( LY/I ). It has the original bore of 85,7mm and a stroke of 95mm, so it is a real 550 roadster barrel. But I haven't ever seen a roadster barrel with seperate sparkplug hole and such tiny fins.
In the pictures you can see this cylinder compared to a 500 roadster KY/W
Thanks
Regards
Ralf

5
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 17, 2025, 02:29:43 PM »
Hi,
Ok, understood. Thank you very much anyway. You helped me a lot.
Last question:
Does anybody know if there is a possibility to get these oxford style exhaust cans?
Otherwise I try to build it myself.
Many thank's!
Regards
Ralf


6
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 16, 2025, 06:26:58 AM »
Hi
maybe you a right and the crankshaft is self made.
Can anybody estimate, how many brooklands engines were produced? Maybe the number of produced pieces was just too small to make a new forging mold?

The actual bore of the cylinder is approx. 57.7mm
Regards
Ralf


7
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 14, 2025, 05:45:56 PM »
Hi,
here are some data about the piston of my engine:
diameter of the gudgeon pin: 14.22mm
Overall length of the piston (from bottom end to very top of the deflector): approx. 96mm
distance between center of the gudgeon pin bore and the very end of the deflector: approx. 46mm
The VIIA conrod is approximately 7mm longer than the normal VIIIC conrod used in the standard T engines.
Cheers
Ralf

8
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 14, 2025, 07:24:10 AM »
My crankshaft it self is not full circle. Both halves are the same as the standard sport crankshaft, but between the crank and the counter weight there is a sheet metal and on this the aluminium padding riveted.
I don't know if this is a original brooklands crankshaft or just a professional modification of a normal crankshaft.
But there are no markings like "villiers sports" as on the normal sports crankshaft stamped on it.

9
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 13, 2025, 10:36:07 AM »
Sorry i have forgotten to answer your question. Yes the crankshaft is drilled for lubrication.
Cheers

10
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 13, 2025, 07:51:18 AM »
Thank you for your answers!

I am pretty sure, that this is the original brookland crankshaft. I have a copy of the No.22 part list and in here you can see a picture of this crankshaft, see attached photo.

The design inlet port is also mysterious to me.
I always tought, that the inlet port with the triangular edges on bottom of the port are the standard design and the complete rectangular design is made for tuning.
As an example i have two similar standard T cylinders tith different inlet ports. Now i was surprised, that the brooklands inlet port also thas the triangular edges.
Thanks
Ralf

11
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 11, 2025, 08:33:30 AM »
Hello and many thank's for your answer.
I fear I haven't understand your explaination about the difference of the head. The different head bolts are clear, because of the aluminium part of the brooklands cylinder. But how does this effect in a difference design of the head itselve? Is the height of the head (where the head bolt nuts are in place) different?

You are absolutely right, it is not so important to know the year. I just want to investigate the history of the engine. I heard the brooklands engine was only sold to racing teams and not to private persons. Is this true?
Does anybody know, if there are any remarkable differences in the geometry between the brooklands conrod and my VIIA conrod (except the weight)? A different length would result in different timing and compression ratio. Or my piston was specialy designed for this  con rod. Many speculations....

Many thanks in advance

12
British Bikes / Re: Villiers chain ?
« on: January 11, 2025, 07:49:28 AM »
Sorry for the late response.
I haven't test it yet because my bike is still a project and i hope i can finish it the next months so I can hopefully ride it the first time.
But for my opinion this little difference of aprx 0.5mm is neglibigle. We will see...
Regards

13
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 10, 2025, 03:39:19 PM »
Many thanks in advance

14
British Bikes / Re: Villiers 172cc brooklands engine?
« on: January 10, 2025, 03:38:21 PM »
More photos

15
British Bikes / Villiers 172cc brooklands engine?
« on: January 10, 2025, 03:37:12 PM »
Dear all,
I have this engine which looks like a mixture of different villiers parts. The cylinder is for my opinion a original brooklands. But the head also?
What is the difference to the tt head?
Furthermore the crankshaft should be also original brooklands. But the con rod is stamped with VIIA. According to the part list the brooklands engine should have a special con rod. Can someone confirm?
The crankcase is marked with T, so should be from a petrol standard sports engine. But all these parts are together for a very long time. Could it be possible, that this engine was built in this configuration? The engine number is 18xx, so it should be aprx 1925/1926?
Further photos will follow.
Many thanks in advance
Regards
Ralf

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