OS XZ M Speed

[normlee]

The OS Speed 1/8 buggy engines are fantastic. Does anyone rate the on road watercooled version please?

 

[normlee]

https://www.hobbytech.com.au/products/rc-engines/engines-boats/os-max-21xz-m-inboard-marine-engine/

 

[David Ashcroft]

Norm talk to Brad Spencer ..he has good OS engine experience.

 

[Grimracer]

I have one.. NIB.. when we OS stared on this motor we asked for a 320 to 340 bore on the carb.. and a standard plug.. 

BUT.. they did not move that direction.

To me.. those.. the carb bore in particular needs to be changed.

Grim

 

[Joern Markset]

I have one.. NIB.. when we OS stared on this motor we asked for a 320 to 340 bore on the carb.. and a standard plug.. 

BUT.. they did not move that direction.

To me.. those.. the carb bore in particular needs to be changed.

Grim

Do you think the 21D is too big? 

 

[Grimracer]

I do.. Seems to me the thing is in the .4" range..

Grim

 

[Joern Markset]

If you want a decent OS .21 marine engine you may look for this one. 

 

[Grimracer]

it was the last project motor we were bouncing around ideas..

I have a number of very fast OS IB motors..  they will be the power for my new Jag III

Grim

 

[Jeff Barnhart]

Has O.S. considered producing the .21 XZ-M again?

 

[Grimracer]

No.. not that I am aware of..

Grim

 

[topfuel443]

If you want a decent OS .21 marine engine you may look for this one. 

View attachment 100171

Joern, where can someone buy that motor? Having a hard time finding it

 

[Joern Markset]

Joern, where can someone buy that motor? Having a hard time finding it

It is very hard to find them. They are popular for the Endurance (multihull) racing in Europe.  Have you considered off road engines? I have been using OS 21 XZ Spec 3 for a while, and it is a nice engine for sure. 

 

[Steven Bryant]

 
Joern, where can someone buy that motor? Having a hard time finding it

I have one and I’m not impressed with it, there are in my opinion lots of better engines from CMB, Nova. The carb is too big, I changed mine for a MAC 21 carb and the engine performed a lot better but after years of playing with it just can’t get it to perform like all the rest.


Sent from my iPad using Tapatalk

 

[Jeff Barnhart]

No.. not that I am aware of..

Grim

That is too bad.

After you drop the factory head clearance down to .006” and run the 20J (outboard) carb this is a great motor. 

 

[Joern Markset]

You may also want to try the 40E carb which is 8,5 mm (0,335") it is a great carb for sure. 
Been using this one on several engines, only with a modification to the drumshaft. (it is very long cause this carb was ment for the 50 SX-H engine)

 

[LarryConrad]

If you want a decent OS .21 marine engine you may look for this one.

View attachment 100171

I have the outboard version of that engine that Rody Rome sells. On my Vision running the 21D carb and a gadget craft carbon pipe, I had no issues with throttle ability, wasn’t finicky to start on the stand, and ran like a scalded cat.

 

[Joern Markset]

I have the outboard version of that engine that Rody Rome sells. On my Vision running the 21D carb and a gadget craft carbon pipe, I had no issues with throttle ability, wasn’t finicky to start on the stand, and ran like a scalded cat.

I have two of the outboard version as well, running both 21D and 40E carb. I can not decide which one is the better one.
However the 21D is a very nice carb!! Running the 21D on Nova Rossi .46 outboard make a big difference compared to the original NR carb.
All in all I just love the OS carbs.

 

[David Ashcroft]

Interesting Joern with the 21d on the 46 response would be crisp..how is top end though?

 

[Joern Markset]

Interesting Joern with the 21d on the 46 response would be crisp..how is top end though?

For me it has been great, engine is screaming like a stabbed pig

 

[David Ashcroft]

Thanks Joern respects ...