Lancia Beta Forum
May 16, 2021, 12:57:03 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: Looking for Lancia Beta Parts
Lots of new items recently added
see: www.lanciabetaparts.co.uk
 
   Home   Help Contact Admin Search Calendar Gallery Articles Login Register  
Pages: [1]
  Print  
Author Topic: Mixture Screw DAT/DATR Carburettors  (Read 284 times)
0 Members and 1 Guest are viewing this topic.
capriblu
Sr. Member
****
Offline Offline

United Kingdom United Kingdom

Posts: 154



« on: February 24, 2021, 08:54:38 PM »

Which one is correct?



* IMG_1626.JPG (72.79 KB, 640x480 - viewed 127 times.)
Logged

!980 2.0 Coupe - Owned since 1990
Nigel
Hero Member
*****
Offline Offline

United Kingdom United Kingdom

Posts: 304



« Reply #1 on: February 24, 2021, 10:56:23 PM »

My s/h carb, which I bought late last year, has the one on the left.
I don't think i've seen the other one before.

N.
Logged

1984 2.0 Carb HPE [ex Aus] Silver..turning to Grey Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
capriblu
Sr. Member
****
Offline Offline

United Kingdom United Kingdom

Posts: 154



« Reply #2 on: February 25, 2021, 12:15:02 PM »

Thanks Nigel,

Would you happen to know what spec the Carb was,  250/1 DAT,  250 DATR or  ....

I've seen references to both types for various DAT & DATR variants - highly confusing.

The item on the right is what I have removed from the carb on my car but I'm questioning whether this is correct - I will remove carb from car at weekend and see what variant it is - I think it is a 250 DATR of some sort but could be a 250 DAT.   I have another spare 250 DAT carb currently without any mixture screw fitted and both of the types above "fit" and seem to travel same distance to stopping point.
Logged

!980 2.0 Coupe - Owned since 1990
Nigel
Hero Member
*****
Offline Offline

United Kingdom United Kingdom

Posts: 304



« Reply #3 on: February 26, 2021, 03:35:33 PM »

Capriblu:

yes, it's a 34 DATR 2/250

It also has 9C stamped on it, but i've no clue what that means.

Hope this helps
Nigel
Logged

1984 2.0 Carb HPE [ex Aus] Silver..turning to Grey Finanza.
2007 Mazda 6 2.3 [current daily, highly recommended]
The past:
1980 2.0 HPE White in South Africa [hope it survives!]
1976 1.6 Coupe Lancia Blu [PFG 76R] [probably deceased]
oh,and an Uno Turbo 1997 also in SA [stolen,never recovered]
capriblu
Sr. Member
****
Offline Offline

United Kingdom United Kingdom

Posts: 154



« Reply #4 on: February 26, 2021, 11:48:24 PM »

Capriblu:

yes, it's a 34 DATR 2/250

It also has 9C stamped on it, but i've no clue what that means.

Hope this helps
Nigel

Many thanks Nigel, will report back when I take carb currently on the car off for a closer look.

Kind regards,

Andrew

Logged

!980 2.0 Coupe - Owned since 1990
capriblu
Sr. Member
****
Offline Offline

United Kingdom United Kingdom

Posts: 154



« Reply #5 on: February 27, 2021, 02:02:16 PM »

So both my carbs including the one on the car are DAT 2/250, i.e.not DATR.

I have seen reference to both types for DAT carbs so very uncertain now.

I have a new 64750.051 - the plain cone shape one and a new staggered profile type one 64750.052 coming in the post.

Will try both and see which works best!

I have a simple CO meter so should be able to check slow running.

Any further clues anyone?

Thanks,

Andrew
Logged

!980 2.0 Coupe - Owned since 1990
Neil-yaj396
Legendary Member
******
Offline Offline

Posts: 1633


1979 1300 Coupe


« Reply #6 on: February 27, 2021, 06:22:16 PM »

Andrew

Only going by the drawings in the Haynes Weber Carb manual, but that seems to suggest that the DAT has a shorter and less pointed mixture screw when compared to the DATR. So seems to suggest that the screw you took out of your DAT is correct?

Neil
Logged
capriblu
Sr. Member
****
Offline Offline

United Kingdom United Kingdom

Posts: 154



« Reply #7 on: February 27, 2021, 09:46:12 PM »

Thanks Neil,

Ironically I've been setting the car up this afternoon with the "wrong" screw and it seems fine!

I'll install the new correct item when it arrives.

I have also purchased a selection of new main and idle jets and air corrector caps and will explore how the car performs with various modest increases.

Will report how I get on.

Andrew

 
Logged

!980 2.0 Coupe - Owned since 1990
capriblu
Sr. Member
****
Offline Offline

United Kingdom United Kingdom

Posts: 154



« Reply #8 on: March 06, 2021, 11:00:15 PM »

So DAT the screw on the right and DATR the one on the left.  New DAT type screw arrived, the old one still seems fine and have tried both screw types in two different DAT 2/250 carbs and no discernible difference in running.
Logged

!980 2.0 Coupe - Owned since 1990
Pages: [1]
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.21 | SMF © 2015, Simple Machines
SMFAds for Free Forums
Valid XHTML 1.0! Valid CSS!