Lotus Elan

wow I have a 40 and a 40E

PostPost by: dgym » Wed Nov 26, 2014 11:10 am

I only just noticed, my dellortos,

one is a dhla40, the other a dhla 40E...

this is wrong, right?
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PostPost by: alan.barker » Wed Nov 26, 2014 1:03 pm

is the car running o.k. If the answer is yes then just drive it :mrgreen: :mrgreen: :mrgreen:
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PostPost by: types26/36 » Wed Nov 26, 2014 1:15 pm

dgym wrote:one is a dhla40, the other a dhla 40E...this is wrong, right?


Unless I'm mistaken your car is an S3 ?? if so both are wrong as Dellorto's were not fitted to S3's :lol:
As I recall the Sprint's were fitted with DHLA 40' s although I dont what the difference is......at least neither of the 40's or 40E's are emission carbs so if they have the same number of progression holes and with the correct jets etc. mixing them will probably work :?:
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PostPost by: jimj » Wed Nov 26, 2014 2:42 pm

Anorak fact, in June/July `67 (S3 time) Webers weren`t available and Dellortos were fitted. I know that for a definite maybe.
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PostPost by: dgym » Wed Nov 26, 2014 8:17 pm

it seems to be running fine...but is it meant to be FASTER!!??? :D :twisted: 8)
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PostPost by: rgh0 » Wed Nov 26, 2014 8:28 pm

A friend of mine has done back to back dyno runs with Webers and Dellortos on his twin cam with no difference in engine performance once they are both setup optimally.

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PostPost by: dgym » Wed Nov 26, 2014 8:39 pm

Oh i have no problem with having dellortos AT ALL.

Just wondering about one being an E and the other not. It would mean a replacement has happened at some stage I'm guessing.
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PostPost by: rgh0 » Thu Nov 27, 2014 7:28 am

If they were fitted originally by Lotus as they had run out of Webers anything is possible :D ..... maybe a mix of E and non E Dellortos was all they could get at short notice

If fitted afterwards by some previous owner then again anything possible - even more so I guess

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PostPost by: steve.thomas » Sat Nov 29, 2014 8:08 pm

I had a similar thing with the Dellortos on my plus2. On closer inspection there were 2 things to note:-

1. Although the floats in each had the same part number (7298.1) one weighes 8.5g and the other 10g, which require different height settings.
2. One carb had a downward squirting pump jet and the other a horizontal one. I changed them both to horizontal, but can't honestly say i noticed any difference.
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PostPost by: bill308 » Mon Dec 01, 2014 9:50 pm

I believe the progression holes are different in number, placement, and diameter between the two families. I also believe the E's have an air balance circuit and vacuum taps. Both are excellent carbs.

The way it was explained to me, the no suffix carbs are designed to get on the mains as soon as possible. The E's have more progression holes to extend the transition range and enable the delay of the onset of the mains. Presumably, this would enhance around town drivability and good mileage, yet retain high speed performance and enhance tunability.

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PostPost by: types26/36 » Mon Dec 01, 2014 10:28 pm

A little more on the differences here:
lotus-carbs-f40/dellorto-dhla-dhla-40e-t21915.html
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PostPost by: dgym » Mon Dec 01, 2014 11:53 pm

So presumably Having two different carbs with different progressions would mean they will never really be in synch?
I SWORE to myself I would not mess around with carbs anymore and here I am thinking about it!
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