HobbyKing.com New Products Flash Sale
Reply
Thread Tools
Old Jan 08, 2013, 09:44 PM
Registered User
United States, OR, Portland
Joined Dec 2010
119 Posts
Help!
Need help finding the correct part number for the first generation OS rotary engine

I bought this first generation os rotary engine ( NSU wankel ) that came without a carb.



and i made a big mistake when i bought the wrong carb of amazon. (the carb is for the 2nd generation.
murcielago is offline Find More Posts by murcielago
Reply With Quote
Sign up now
to remove ads between posts
Old Jan 08, 2013, 11:43 PM
Registered User
Reginald's Avatar
Belgium
Joined Aug 2004
3,593 Posts
Quote:
Originally Posted by murcielago View Post
I bought this first generation os rotary engine ( NSU wankel ) that came without a carb.



and i made a big mistake when i bought the wrong carb of amazon. (the carb is for the 2nd generation.
You most probably do have the 3rd or 4th generation carb ? hard to tell without picture. Look at the pictures of my engines. Remarkably the old style (4) carb was used for the anniversary gold version but in black anodising. I do have several worn Wankels for didactical reasons.
Reginald is offline Find More Posts by Reginald
Reply With Quote
Old Jan 09, 2013, 12:15 AM
Registered User
United States, OR, Portland
Joined Dec 2010
119 Posts
nope. the carb doesnt fit at all. the mounting screws are rotated 90deg away

the part number is 41618020







if i am able to find a carb that fits perfectly can I use it without any issues? does it have to be the exact same model?
murcielago is offline Find More Posts by murcielago
Reply With Quote
Old Jan 09, 2013, 12:32 AM
Registered User
Joined Jun 2011
1,522 Posts
Probably not. Any carb that fits will probably work. I have both the first and second versions. let me check and see what yours uses. Your best bet would probably be a Perry carb.
datsunguy is offline Find More Posts by datsunguy
Reply With Quote
Old Jan 09, 2013, 01:18 AM
Registered User
Reginald's Avatar
Belgium
Joined Aug 2004
3,593 Posts
Quote:
Originally Posted by murcielago View Post
nope. the carb doesnt fit at all. the mounting screws are rotated 90deg away

the part number is 41618020







if i am able to find a carb that fits perfectly can I use it without any issues? does it have to be the exact same model?
The carburettor hole diameter is 9 millimeter. If the dia.size of the carb you've got is 9mm then you can drill and tap two new correctly positionned holes. I did check in my 1990 OS parts catalogue and the OS number for the old style carburettor is number 41618010. But the carb as shown in my first picture came before all those 2's 3's and 4's. You seem to have received the latest version as used today.
Reginald is offline Find More Posts by Reginald
Reply With Quote
Old Jan 09, 2013, 02:30 AM
Registered User
United States, OR, Portland
Joined Dec 2010
119 Posts
Quote:
Originally Posted by Reginald View Post
The carburettor hole diameter is 9 millimeter. If the dia.size of the carb you've got is 9mm then you can drill and tap two new correctly positionned holes. I did check in my 1990 OS parts catalogue and the OS number for the old style carburettor is number 41618010. But the carb as shown in my first picture came before all those 2's 3's and 4's. You seem to have received the latest version as used today.
i doubt it's the 41618010 as well because the mounting holes are perpendicular to the needle
murcielago is offline Find More Posts by murcielago
Reply With Quote
Old Jan 09, 2013, 03:30 AM
Registered User
Reginald's Avatar
Belgium
Joined Aug 2004
3,593 Posts
OS wankel

OS Wankel engine manual 1990
Reginald is offline Find More Posts by Reginald
Reply With Quote
Old Jan 09, 2013, 04:06 AM
Registered User
Reginald's Avatar
Belgium
Joined Aug 2004
3,593 Posts
OS wankel

Here you have all 3 carbs as used on Wankels. All are of 9mm diameter. The one on the right with the trumpet intake is the last version and the only one with mounting holes on the other side. Picture two shows an older 10FP carb again 9mm and that can go straight into the Wankel. But later FP's did have a black plastic fuel nipple mind. Only other difference between the older and the latest wankel is the size of the screws, 2,5mm for the elder ones and 3,34mm on the latest version. But not too sure on them treads, possibly OS sizes, have not time to sort that out right now.
Reginald is offline Find More Posts by Reginald
Reply With Quote
Old Jan 09, 2013, 06:01 AM
Registered User
United States, OR, Portland
Joined Dec 2010
119 Posts
Quote:
Originally Posted by Reginald View Post
Here you have all 3 carbs as used on Wankels. All are of 9mm diameter. The one on the right with the trumpet intake is the last version and the only one with mounting holes on the other side. Picture two shows an older 10FP carb again 9mm and that can go straight into the Wankel. But later FP's did have a black plastic fuel nipple mind. Only other difference between the older and the latest wankel is the size of the screws, 2,5mm for the elder ones and 3,34mm on the latest version. But not too sure on them treads, possibly OS sizes, have not time to sort that out right now.
the carb on the left looks like the one on stock images for my engine.
murcielago is offline Find More Posts by murcielago
Reply With Quote
Old Jan 09, 2013, 06:02 AM
Registered User
United States, OR, Portland
Joined Dec 2010
119 Posts
Quote:
Originally Posted by Reginald View Post
OS Wankel engine manual 1990
well this is strange.

a few results on google shows otherwise..
murcielago is offline Find More Posts by murcielago
Reply With Quote
Old Jan 09, 2013, 06:33 AM
Registered User
Reginald's Avatar
Belgium
Joined Aug 2004
3,593 Posts
Quote:
Originally Posted by murcielago View Post
the carb on the left looks like the one on stock images for my engine.
Yes that was the very first carburettor followed by the newer type second in the pic. I'll see if I can assemble one of those first types from the many parts that I have ? I am pretty sure that I do have a complete second type somewhere.
Reginald is offline Find More Posts by Reginald
Reply With Quote
Old Jan 09, 2013, 06:34 AM
Registered User
Reginald's Avatar
Belgium
Joined Aug 2004
3,593 Posts
Quote:
Originally Posted by murcielago View Post
well this is strange.

a few results on google shows otherwise..
This is from the original OS factory parts book from 1990
Reginald is offline Find More Posts by Reginald
Reply With Quote
Old Jan 10, 2013, 01:52 AM
Registered User
United States, OR, Portland
Joined Dec 2010
119 Posts
Quote:
Originally Posted by Reginald View Post
This is from the original OS factory parts book from 1990
i think i know why.

The intake port is located right beside the exhaust port on the book.

In the first generation wankel, the intake port is located in front and to the side of the exhaust port.

also, the front housing contains alot more fins than the first generation's housing .
murcielago is offline Find More Posts by murcielago
Reply With Quote
Reply


Thread Tools

Similar Threads
Category Thread Thread Starter Forum Replies Last Post
Sold Wankel Rotary Graupner OS 49 Engine!/ Make offer~ flyinjrc74 Aircraft - Fuel - Engines and Accessories (FS/W) 3 Oct 02, 2012 07:10 AM
Help! need help finding plans or a kit for a 25cc engine jojobean Giant Scale Airplanes 2 Aug 17, 2012 03:36 PM
Discussion Need help finding an engine part.. GeetarJoe Engines 31 Jul 03, 2012 03:22 PM
Sold Groupner OS - I .30 cu.in. Rotary engine scones007 Aircraft - Fuel - Engines and Accessories (FS/W) 10 Jun 17, 2012 04:25 PM