? for carb experts
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=107490
Printed Date: 25 Aug 2025 at 12:50pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: ? for carb experts
Posted By: Bill_MN
Subject: ? for carb experts
Date Posted: 11 Jun 2015 at 9:04pm
Is there a conversion for numbered venturi sizes? What is the ID of a #29 venturi? Reason I'm asking is I found a possible replacement for this Rumely carb and the venturi is listed as 29/32 ID while the carb specs say it takes a #29 venturi
-------------
1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
|
Replies:
Posted By: Leesok
Date Posted: 11 Jun 2015 at 10:42pm
|
Not an expert, all trial and error here. Had a feller tell me once that the number on the Venturi is the size of the opening in 32nds. Have drilled out a few distillate accordingly with satisfactory results.
|
Posted By: Bill_MN
Date Posted: 12 Jun 2015 at 3:47pm
That would make sense, originally I was thinking it was mm but that seemed too big. I'll have to measure the old one to know for sure but I was still curious.
-------------
1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
|
Posted By: Matt (Jordan,MN)
Date Posted: 22 Jun 2015 at 12:43am
Did you find a replacement venturi? I am now in need of one for my Waukesha 6bk. If you didn't find one I may be trying to fabricate one. Matt
-------------
Owner of Matt Scott LLC
Specializing in NOS and used Allis Chalmers tractor & implement parts & liturature and Magneto Repair
http://www.mattscottllc.com/
|
Posted By: Bill_MN
Date Posted: 22 Jun 2015 at 4:09pm
No I haven't, McDonald has a venturi for a Zenith 267 that is 29/32 ID and looks similar to mine, might fit with some mods. I measured mine though and the ID is 1.030. I can bring my old one up when I bring that magneto and you can take some measurements, I'd guess the 6BK one would be similar. I'd be interested if you can make one. Are you around July 3rd?
-------------
1951 WD #78283, 1918 Case 28x50 Thresher #76738, Case Centennial B 2x16 Plow
|
|