Mk2 1780cc xflow with a 234 Kent cam and a standard 32/36 webber which I'm looking to change for something better. I would ideally like to run twin webbers but being a Mk2 I'd have to relocate or remove the booster. Also I'm told it's illegal to run twin carbs on anything made after 6/1976 so for these reasons I'm looking at other options which are:

Re-jetted 32/36
or
38 DGMS
or
Single side draft with a 40 or 45 dcoe

Any thoughts on what would be the best option?

Thanks

Single DCOE manifolds aren't that great and you have the same problem regarding the pollution gear you would with twins.

You wouldn't bother with the 32/36 you need to go 38 DGMS or 40 DCNF. Your problem now is with the standard manifold, there is not enough volume to feed the engine. I do a spacer kit to increase the volume that helps however at that capacity with that cam you will still be down on torque and HP compared to twins by up to 10 ft/lb and 10 HP.

quote:

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DCOE manifolds aren't that great and you have the same problem regarding the pollution gear you would with twins.

You wouldn't bother with the 32/36 you need to go 38 DGMS or 40 DCNF. Your problem now is with the standard manifold, there is not enough volume to feed the engine. I do a spacer kit to increase the volume that helps however at that capacity with that cam you will still be down on torque and HP compared to twins by up to 10 ft/lb and 10 HP.

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Thanks for the feedback

Which would be the best option out of the 38 DGMS or the 40 DCNF?

I know there is an issue with the 38 DGMS accessing the idle screws, does the 40 DCNF have this issue? And would a 44 DCNF be a better option?

Tempted just live on the wildside and go with the twins, my mk2 is a 9/1976. Would 45's be go with this cam & capacity?

DCNF idle screw is much easier to get at and you benefit from the larger chokes.

40's are plenty with that cam and capcity.

Ok, can you please email me a price for your spacer kit.

Will the DCNF need an adapter plate for the manifold or do they bolt straight on?

Thanks again

Mk1 Lotus

Single DCOE manifolds aren't that great and you have the same problem regarding the pollution gear you would with twins. 

 
 
What's not good about the single lynx crossover manifold? I've heard a few people knocking them. Is it the flow characteristics? I have found one advantage with a single compared to a twin... The vacuum connection is tapped into two runners as opposed to one. I have my brake booster and PCV connected with a Y fitting into the manifold and all seems to work well.

DAZ
 
9/76 is actually the month and year that ADR27A was put into effect so on your car the date is kind of irrelevant and it all comes down to whether your ID plate is stamped ADR27 or ADR27A.
Having said all that, the cars are now 35 years old and the majority of coppers wouldnt have a clue what all this meant anymore. 
 
Your car isnt daily driven and is on club permit so i would pretty much say do what you want as long as it is neatly done and well set up (My carby guy can sort this for you).
I have heard of very few people running into trouble from an emissions perspective unless they were drawing attention to themselves and their car by being a class A knob head which from my experience doesnt fit the bill for you or the appearance of your car.
 
G

hahaha, well put Gdub :-D

I'd go the motor bike carb set up. Done it to mine and goes well with economy. Lot less issues with tuning too.
 
Yamaha R1 1000's do the trick, manifolds can be bought from Bogg Bros in Pommy land. Plenty of info in fitting 'em up too.