[TR] weber carbs

DAVID MASSEY dave1massey at cs.com
Wed Feb 5 14:25:08 MST 2020

 Carburetors are not trivial.  The fuel/air ratio controls are subtle and subject to many outside variables such as temperature.  The A/F ration needed at a given air flow will be different depending on engine speed vs throttle position so adjustments are, at best, a compromise.  

The lads in Coventry spend many, many hours setting up an optimum compromise and I see no sense in tossing all that work in the bin unless you have made really significant changes to the engine (cam, compression, porting, etc)
I agree.  I'll stick with the SU's.

-----Original Message-----
From: Michael Marr <mmarr at albiontechnical.com>
To: dave <dave at ranteer.com>; Mark J Bradakis <mark at bradakis.com>
Cc: triumphs at autox.team.net <triumphs at autox.team.net>
Sent: Wed, Feb 5, 2020 2:05 pm
Subject: Re: [TR] weber carbs

 <!-- #yiv1082235734 _filtered {} _filtered {} #yiv1082235734 #yiv1082235734 p.yiv1082235734MsoNormal, #yiv1082235734 li.yiv1082235734MsoNormal, #yiv1082235734 div.yiv1082235734MsoNormal {margin:0in; margin-bottom:.0001pt; font-size:11.0pt; font-family:"Calibri", sans-serif;} #yiv1082235734 a:link, #yiv1082235734 span.yiv1082235734MsoHyperlink { color:blue; text-decoration:underline;} #yiv1082235734 span.yiv1082235734EmailStyle19 { font-family:"Calibri", sans-serif; color:windowtext;} #yiv1082235734 .yiv1082235734MsoChpDefault { font-size:10.0pt;} _filtered {} #yiv1082235734 div.yiv1082235734WordSection1 {} -->Here’s an interesting article on various carb choices for the BMC B Series engine, which I think would be fairly analogous to the TR2 through TR4 engines.  It covers the 32/36 DGV, the 45DCOE, and the variations on the H4 and H6 SUs.    http://www.mgbmga.com/tech/mgb19.htm    I think I will keep my SUs 😊    Mike    Michael J Marr, P.E., CEng. Albion Technical Services W5918 Hackbarth Rd Fort Atkinson, WI 53538    Cell:  630-202-0065 Email:  mmarr at albiontechnical.com    From: dave <dave at ranteer.com> 
Sent: Wednesday, February 5, 2020 10:41 AM
To: Michael Marr <mmarr at albiontechnical.com>; Mark J Bradakis <mark at bradakis.com>
Cc: triumphs at autox.team.net
Subject: Re: [TR] weber carbs    Yes,  for a stock engine.   My tr4 is waaay not stock     -------- Original message -------- From: Michael Marr <mmarr at albiontechnical.com> Date: 2/5/20 9:52 AM (GMT-06:00)  To: Mark J Bradakis <mark at bradakis.com> Cc: triumphs at autox.team.net  Subject: Re: [TR] weber carbs     Well, having written what I wrote, I did a little research and found that someone is actually offering a dual 32/36 DGEV setup for a TR7.  So maybe it’s easier to do than I thought. I would think this would be a lot of carb for this engine, however.     https://www.amazon.com/TRIUMPH-DUAL-WEBER-CONVERSION-P28-010/dp/B01N5QPJC6    Mike Michael Marr    Mobile:  630-202-0065    Sent from my iPad 
On Feb 5, 2020, at 07:03, Michael Marr <mmarr at albiontechnical.com> wrote: 
I don’t know a lot about Weber carbs, but I believe that these particular carbs are progressive choke - that is, at normal throttle openings only one choke (the smaller one) is in use.  The second choke opens only when the throttle is opened wide.  I believe this style of Weber was developed to give cars the economy of a single choke carb under normal driving conditions, with the ability to greatly increase mixture flow to the engine when additional power was needed. As such, I would think that it would be difficult to synchronize a pair of them. But, as I said up front, I know very little about Weber carbs...


Michael Marr

Mobile:  630-202-0065

Sent from my iPad

On Feb 5, 2020, at 02:23, Mark J Bradakis <mark at bradakis.com> wrote: 


On 2/4/20 8:00 PM, dave wrote: 


I think I found the ID – could it be a 32-36 DGV? 









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