Twin Weber DCNF carbs in the RWD layout. Does it ever work?

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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by reliant-reviver » Mon Oct 14, 2019 4:49 pm

Quick post for quick replies as I'm considering a purchase at present.

Does anyone have anything positive to say about the twin DCNF setup in the RWD configuration of the SS1? All I hear is comments about fueling issues and bogging down out of bends. Nick K. persevered for many years with them. I think Jeff Craske was one who struggled with them back in the 90's?

Bother, don't bother?


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by philhoward » Mon Oct 14, 2019 4:51 pm

Ours goes better on a DMTL.. haven’t had it on the rollers but I don’t think we’ve lost any ponies along the way.

Doesn’t sound as nice though!


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by CNHSS1 » Mon Oct 14, 2019 5:04 pm

For the cost, modern TB(s) and a megasquirt is future proof and much more reliable, tractable and accuarte throughout the rev range than any car setup


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by Edzed » Mon Oct 14, 2019 5:05 pm

reliant-reviver wrote:
Mon Oct 14, 2019 4:49 pm
I think Jeff Craske was one who struggled with them back in the 90's?
Well remembered Phil! If I had my time again I wouldn't bother! At places like Goodwood with fast flowing bends the DCNF set up showed improvements over the standard arrangement, but anywhere with slow corners it would be slow to pick up, as you rightly point out. I achieved a 2 second improvement at Goodwood, but that was with the DCNF's, gas flowed head and camshaft change when compared to completely standard. A similar improvement was achieved at Lydden, but at Curborough maybe 0.5sec (not figure of 8 layout). Of course this could have been improvements in driving rather than the car. :wink:
Last edited by Edzed on Mon Oct 14, 2019 5:06 pm, edited 1 time in total.


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by CNHSS1 » Mon Oct 14, 2019 5:05 pm

Cost wise DCNFs and a suitable manifold arent cheap or easily obtainable either


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by philhoward » Mon Oct 14, 2019 5:06 pm

If you fancy a set, I have some here at less than Ford Tax prices..


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by philhoward » Mon Oct 14, 2019 5:08 pm

There's also a set of TB's in the garage ready to go on but still weighing up the winter upgrades..


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by nickkeyser » Mon Oct 14, 2019 5:38 pm

I think I was lucky with mine, as although part of the reason for replacing mine was the issues turning left, this actually only really manifested after I switched to slicks, and only really on one bend all season, and I also had serious oil surge on the same bend. It made power it wouldn’t have achieved on a single carb, but totally agree there’s better alternatives out there now.

I think for most cars they should provide a good upgrade, but I think it depends on where they originally came from / their base spec, and the setup. They’re extremely picky on fuel pressure and float level, and I spent a small fortune on jets over the years, not to mention many hours!

Personally if I was doing it again and I had the monies, I’d consider EFi from the get go.



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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by philhoward » Mon Oct 14, 2019 5:41 pm

Mine (like most at a guess) are from a Maestro - /99 and /100 (Left and right) from memory?


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by CNHSS1 » Mon Oct 14, 2019 5:59 pm

My DCNFs went well on my CVH racer to be fair, but that was nearly 20years ago
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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by reliant-reviver » Mon Oct 14, 2019 6:01 pm

I have two sets of 40s with CVH manifold here.
Been on the shelf 10 plus years (like many things) although that appears to have been a worthwhile investment none the less. They were always intended for use on the 1900 but never got round to fitting while it running.

What I am currently eyeing up is the complete setup from a Matra Bagheera. These are the smaller 36 DCNFs and I should think more suited to the 1300 that I'm looking to build to (hopefully considerably) exceed 100bhp.

Yes efi would ultimately be the way to go. But for me there's something appealing about the period correctness of fitting carbs. That and the noise. Bwaaaaaap


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by CNHSS1 » Mon Oct 14, 2019 7:37 pm

Have you not heard TBs?? Same as twin carbs for sound jut with less misfiring and bogging.

As for period correctness, i could understand that on a concours or completely original car, but not on one of your 'Triggers Broom' fleet. As it is, period correctness will just mean less effective but give you an ideal racing drivers excuse i guess... :mrgreen:


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by reliant-reviver » Mon Oct 14, 2019 8:28 pm

There's some very nice direct to head throttle bodies being produced for the cvh by a small company called gradient engineering in Leicester. Also just released roller rockers if their own design.

Yes TBs would be a better idea.

But unburnt fuel and signed eyebrows.

Thanks for the feedback and thoughts chaps. Hopefully pick this up at a later date.


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by CNHSS1 » Mon Oct 14, 2019 8:32 pm

Those gradient TBs are lovely 8) and pretty good price compared to a new pair of webers and a manifold,


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Twin Weber DCNF carbs in the RWD layout. Does it ever work?

Post by choughton » Sun Nov 03, 2019 8:44 pm

If you really like the idea of carbs I can really reccomend my setup,
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