[Healeys] Non Healey Request

[Kees Oudesluijs]

Ed has his limitations as Ant does but I think Ant is more inclined to 
repair things himself. Anyway they have to make a show and the result of 
their work is not that important. If you look closely enough that shows.

SU's are certainly not rubbish.  In fact they are a very clever design. 
However it is not easy to get them absolutely identical which makes it 
sometimes difficult to get them synchronised over the whole rpm range. 
On a tuned engine it is complicated to get the needle profile and 
dashpot spring right from scratch.

On older cars with SUs you have the problem of spindle wear/false air, 
leakages and sometimes sticking pistons because of wear, dirt or 
vibrations. I had SU's on my Triumph Spitfire and worked on them for 
others on A-H, MG, Mini, TR, Sunbeamand on Strombergs (similar to SU) on 
TR5/6, Saab, Volvo, Jensen-Healey. Spindle wear was nearly always an issue.

A Double Weber/DellOrto set up has a barrel for each cylinder which 
makes for better breathing, no moving parts other than the butterflies 
and accelerator pump and its spindles are on sealed ball bearings so no 
wear/false air or leakage. They are very simple to set up on a rolling 
road if you are properly equipped specialist with a large choice of 
chokes and jets and once set up properly you do not have to touch them 
for a long time. Many clubs have information on the jetting and the 
venturies to be used. Failure of the diaphragm of the accelerator pumps 
is extremely rare. In more that 40 years it never happened to me.

The gas mileage for both a properly set up SU set or Weber/DellOrto set 
are very similar but Webers/DellOrtos perform better on full throttle 
and high rpm.

I have a double DellOrto DHLA set up on my car (J-H) and I have not 
touched them for years. If need be they are easy to balance without the 
need of vacuum gauges and even setting the idle mixture without CO meter 
or Colourtunes is easy enough if your ears are alright.


Kees Oudesluijs



Op 23-11-2020 om 18:26 schreef Bob Spidell:
> I generally like Ant Anstead--still preferred Edd, though--but when he 
> called SUs 'rubbish' I almost threw my remote at the big screen. Even 
> a pro like Edd had to bring in a specialist to tune the Webers on a Lambo.
>
> SUs are a simple, elegant design; compared to them fixed-choke carbs 
> with their multiple jets, accelerator pumps--a common failure 
> point--are a kludge. Both share common float valve/bowl issues.
>
>
> On 11/23/2020 8:48 AM, David Nock BCS via Healeys wrote:
>> We have removed several sets of Webers over the years on several 
>> different British Cars. Triumphs, MGs, Healeys. Due to poor running, 
>> poor gas economy etc.,
>> They are great if you have a high performance engine but on a stock 
>> or mild built British motor they are more work that they are worth.
>> The SU carbs once set up correctly will not require and fiddling
>> David Nock
>> British Car Specialists
>> 209-948-8767
>> www.britishcarspecialists.com
>> *From:* Kees Oudesluijs via Healeys
>> *Sent:* Monday, November 23, 2020 8:28 AM
>> *To:* healeys at autox.team.net
>> *Subject:* Re: [Healeys] Non Healey Request
>>
>> The Weber, or better two Webers (or DellOrtos) should be fine. 
>> However they should be fitted with the correct jets and venturies. 
>> Best to contact a MG forum, they will know.
>>
>> Webers or DellOrtos are so much easier to maintain than the SUs. A 
>> good book is Des Hammill's book How to Build & Power Tune Weber & 
>> DellOrto DCOEE & DHLA Carburetors
>>
>> Kees Oudesluijs
>>
>>
>
>
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation  $12.75
>
> Archive: http://www.team.net/pipermail/healeys http://autox.team.net/archive
>
> Healeys at autox.team.net
> http://autox.team.net/mailman/listinfo/healeys
>
> Unsubscribe/Manage: http://autox.team.net/mailman/options/healeys/coudesluijs@chello.nl
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/healeys/attachments/20201123/d30c62ee/attachment.htm>