Dellorto carbs
- Neil Bardsley
- 356 Fan
- Posts: 1100
- Joined: Tue Mar 20, 2012 10:21 am
- Location: London
Re: Dellorto carbs
The feedback from type 4 crowd is dels are better than webers
- DonCichocki
- 356 Fan
- Posts: 521
- Joined: Thu Aug 22, 2013 4:29 pm
- Location: Lafayette, NJ
Re: Dellorto carbs
+1 Dellorto over Weber. No Zenith experience.
- Bruce Smith
- 356 Fan
- Posts: 1624
- Joined: Sun Jun 19, 2011 9:47 am
- Location: Rochester, NY
- Contact:
Re: Dellorto carbs
I agree Ron. S-spec Zeniths with ported manifolds are certainly a good match for 'big bore' with a C/912 cam, and factory jet specs. are the best starting (or ending) point. I've got experience with Dellortos on just one engine, and was very happy with them. I only swapped them to Zeniths for originality. Also, parts and jets for Zeniths are plentiful. Not so much for Dells.Ron LaDow wrote: ↑Thu Mar 30, 2023 12:41 am "I had 36's on my previous engine but wanting a correct appearance, went with Solexes. The Dells were easier to dial in."
Alan Klingen was a fan of 36mm Dels on ~1600 and 1720 engines; dyno'd well.
It is only my opinion that the factory offered 40mm carbs for homologation purposes, but found a market for them and continued to flog them.
36mm Zeniths work wonderfully on 1720 engines with good manifolds and that's the hard part.
Bruce Smith
- Mike Wilson
- Classifieds Monitor
- Posts: 11490
- Joined: Tue Apr 15, 2008 4:37 pm
- Location: SW Los Angeles
Re: Dellorto carbs
I've found Dellorto parts from CB Performance.
Mike
Mike
Mike Wilson
Lomita, CA
'63 B coupe
Lomita, CA
'63 B coupe
- Jay Broemmel
- 356 Fan
- Posts: 312
- Joined: Tue Jun 03, 2008 1:12 am
- Location: San Francisco, CA
- Instagram: @slouchcycles
Re: Dellorto carbs
+5 on great running, trouble free Dellortos. Alan at the Stable talked me into them and once they were dialed in, I haven’t had any problems. J
- John Clarke
- 356 Fan
- Posts: 2115
- Joined: Wed Aug 27, 2008 6:38 am
- Location: East Sussex, England
- Contact:
Re: Dellorto carbs
Hi David Hope you are keeping well.
Dell's ! Are these for you ? They are the Best. But JIMHO. We now have the 912 engine at 1720. And are running with the Dellorto 40 DRLAs
One good upgrade is the raised Idle Jet Conversion / 'Jet Doctor'(Think they were from CB) These help avoid the plugged Idle Jet problem in their original position (flush in the top of carb).We also have the Spray Bars installed with 34mm Vents. I have Jet settings for various applications back in the UK, but are currently in Spain. Also used the 36 DRLAs which were very good low down. Haven't had any issues with Ethanol, which is surprising, with the many Rubber O Rings used in these carbs. When Dialled in, they have a very Stable idle. Transition is Smooth with No Flat Spots. Each to their own, but I would never go back to the IDF Weber. Ran with both the Zenith NDIX and the Solex 40 P11. Never entirely happy with all these.
I would however like to try my late pair of 40 P11 Solex with a Solid Shaft Conversion with the 1720cc.
Cheers Jay
Dell's ! Are these for you ? They are the Best. But JIMHO. We now have the 912 engine at 1720. And are running with the Dellorto 40 DRLAs
One good upgrade is the raised Idle Jet Conversion / 'Jet Doctor'(Think they were from CB) These help avoid the plugged Idle Jet problem in their original position (flush in the top of carb).We also have the Spray Bars installed with 34mm Vents. I have Jet settings for various applications back in the UK, but are currently in Spain. Also used the 36 DRLAs which were very good low down. Haven't had any issues with Ethanol, which is surprising, with the many Rubber O Rings used in these carbs. When Dialled in, they have a very Stable idle. Transition is Smooth with No Flat Spots. Each to their own, but I would never go back to the IDF Weber. Ran with both the Zenith NDIX and the Solex 40 P11. Never entirely happy with all these.
I would however like to try my late pair of 40 P11 Solex with a Solid Shaft Conversion with the 1720cc.
Cheers Jay
- John Clarke
- 356 Fan
- Posts: 2115
- Joined: Wed Aug 27, 2008 6:38 am
- Location: East Sussex, England
- Contact:
Re: Dellorto carbs
Nearly Forgot.
Any Issues with the Spares Situation for the Dellorto DRLAs can normally all be found from Matt Cooper who runs Eurocarb over here in the UK. He was there right at the beginning with Contact Developments the Sole UK importer of Dellorto Carbs and Spares, back in the day. He has continued the good work. There hasn't been a part that I haven't been able to source.
Regards Jay
Any Issues with the Spares Situation for the Dellorto DRLAs can normally all be found from Matt Cooper who runs Eurocarb over here in the UK. He was there right at the beginning with Contact Developments the Sole UK importer of Dellorto Carbs and Spares, back in the day. He has continued the good work. There hasn't been a part that I haven't been able to source.
Regards Jay
- Greg Bryan
- 356 Fan
- Posts: 3692
- Joined: Sat Oct 04, 2008 1:05 pm
- Location: San Pedro, CA 90732; Fallen Leaf, CA 96150
- Contact:
Re: Dellorto carbs
These are the Dells set up on VW manifolds. They are very well made and nice details.
I tried them on another VW motor I built but the jetting was off so I didn't use them yet. Weber jets and parts are very easy to find and relatively cheap. Not so much for the DellOrtos.
These have very little use on them.
I tried them on another VW motor I built but the jetting was off so I didn't use them yet. Weber jets and parts are very easy to find and relatively cheap. Not so much for the DellOrtos.
These have very little use on them.
Greg Bryan
- Brian R Adams
- 356 Fan
- Posts: 3287
- Joined: Thu Mar 27, 2008 1:34 pm
- Location: N. Nevada
Re: Dellorto carbs
Is there an article somewhere about "ported manifolds" for Zeniths?Bruce Smith wrote: ↑Thu Mar 30, 2023 8:47 amI agree Ron. S-spec Zeniths with ported manifolds are certainly a good match for 'big bore' with a C/912 cam, and factory jet specs. are the best starting (or ending) point.
-
Welcome to the era of policy-based evidence-making.
Difficile est saturam non scribere (Juvenal)
Difficile est saturam non scribere (Juvenal)
- Greg Bryan
- 356 Fan
- Posts: 3692
- Joined: Sat Oct 04, 2008 1:05 pm
- Location: San Pedro, CA 90732; Fallen Leaf, CA 96150
- Contact:
Re: Dellorto carbs
Aren’t the C Zenith manifold runners larger to go with the larger c head intake ports?
Greg Bryan
- Jacques Lefriant
- 356 Fan
- Posts: 4599
- Joined: Mon Dec 06, 2010 1:50 pm
- Location: Washoe county NV
Re: Dellorto carbs
Hi
since Al isn't posting maybe digital fuel injection is the answer since carbs have no support and they come out of China now.
since Al isn't posting maybe digital fuel injection is the answer since carbs have no support and they come out of China now.
- Jacques Lefriant
- 356 Fan
- Posts: 4599
- Joined: Mon Dec 06, 2010 1:50 pm
- Location: Washoe county NV
- Ron LaDow
- 356 Fan
- Posts: 8092
- Joined: Wed Mar 26, 2008 11:45 am
- Location: San Francisco
Re: Dellorto carbs
"Is there an article somewhere about "ported manifolds" for Zeniths?"
Not for 36s to my knowledge; hand porting 4ea 5'-long passages and expecting anything like consistency it a step beyond hubris IMO.
A local shop had an optical comparator which they allowed me to use (and two full days to dimension the ports at ~3mm stations). And then it took 5-axis CNC to deliver manifolds for 36mm carbs - here's the port casts: 36mm on the left. The head end was not altered from the 'bulged' end of the stock piece (matching the head); the remainder started at 36mm (centered on the carb bores) and maintained a consistent taper to the head D.
Would have sworn I had images comparing both ends of the stock and CNC'd 36 manifolds, but can't locate them right now.
(Added by edit)
32mm vs 36mm throttle bodies:
Not for 36s to my knowledge; hand porting 4ea 5'-long passages and expecting anything like consistency it a step beyond hubris IMO.
A local shop had an optical comparator which they allowed me to use (and two full days to dimension the ports at ~3mm stations). And then it took 5-axis CNC to deliver manifolds for 36mm carbs - here's the port casts: 36mm on the left. The head end was not altered from the 'bulged' end of the stock piece (matching the head); the remainder started at 36mm (centered on the carb bores) and maintained a consistent taper to the head D.
Would have sworn I had images comparing both ends of the stock and CNC'd 36 manifolds, but can't locate them right now.
(Added by edit)
32mm vs 36mm throttle bodies:
Ron LaDow
www.precisionmatters.biz
www.precisionmatters.biz
- John Clarke
- 356 Fan
- Posts: 2115
- Joined: Wed Aug 27, 2008 6:38 am
- Location: East Sussex, England
- Contact:
- Greg Bryan
- 356 Fan
- Posts: 3692
- Joined: Sat Oct 04, 2008 1:05 pm
- Location: San Pedro, CA 90732; Fallen Leaf, CA 96150
- Contact: