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> Dual Dellorto DHLA 40 Carbs, Racing carbs
flmont
post Mar 13 2019, 10:19 PM
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would these carbs be good for a type 4 2.0 build bigger crank and cam set up ,they are asking for 350.00 OBO,..Thanks
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wes
post Mar 14 2019, 12:25 AM
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I have 40 Dellorto’s on my 2056 and think they’re a perfect set up!
That’s I believe a good deal if you’re talking about $350 for both. I paid more and had them rebuilt.
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johnhora
post Mar 14 2019, 09:11 AM
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questions to ask...
what condition are they in...
do they need a rebuild...
are all parts there...etc
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flmont
post Mar 14 2019, 09:22 AM
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I dont know yet but I will ask them,..If they need rebuilt whwere is the ( Place ) to send them. Thanks Frank
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flmont
post Mar 14 2019, 09:23 AM
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Wes, Whats the largest displacement can you go with those carbs. ?? TIA,..Frank
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GregAmy
post Mar 14 2019, 10:13 AM
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DHLA or DRLA? DHLA are side drafts...

If we're talking Rs, then the biggest venturi for the 40 DRLA is 34mm.

However, CB Performance offers a kit to convert the DRLA to 36mm venturis and changing the design of the discharge tubes:

https://www.cbperformance.com/product-p/7345.htm
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yeahmag
post Mar 14 2019, 11:05 AM
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You can get 36mm venturi's from folks other than CB.

http://vwparts.aircooled.net/Dellorto-DRLA...-venturi-36.htm

I did have to trim about 1mm off of them for my carbs. Apparently there are quality control issues...
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GregAmy
post Mar 14 2019, 11:13 AM
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That's good to know.

I converted the 40s on my racer to the CB Performance kit and they may also have some quality issues. Primarily I don't think the discharge tube is properly seating. Contacted their technical support and they never got back to me so I stopped trying.

I ran it like that last Fall a couple of times and it seems to work fine, AFRs come in OK after re-jetting, but I'm getting some inconsistencies in smoothness and light backfiring on throttle off. Gonna have Chris Foley go through them and see what he thinks.
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flmont
post Mar 14 2019, 11:21 AM
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Thanks GregAmy,.. DRLA the pic shows ,this is also a build for general street use also,.??
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yeahmag
post Mar 14 2019, 11:26 AM
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The 40 DRLA will suit you just fine. Make sure you grab the CB Performance book on them and double check that the jets and floats are in the ballpark. I have TONS of parts for them, so let me know if you need anything.
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SirAndy
post Mar 14 2019, 11:43 AM
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QUOTE(yeahmag @ Mar 14 2019, 10:05 AM) *
You can get 36mm venturi's from folks other than CB.

36 seems too big for a 2.0L engine.

I went down to 32 venturis on my 2056 to get rid of a annoying off idle flat spot.
(IMG:style_emoticons/default/popcorn[1].gif)
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yeahmag
post Mar 14 2019, 12:28 PM
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QUOTE(SirAndy @ Mar 14 2019, 09:43 AM) *

QUOTE(yeahmag @ Mar 14 2019, 10:05 AM) *
You can get 36mm venturi's from folks other than CB.

36 seems too big for a 2.0L engine.

I went down to 32 venturis on my 2056 to get rid of a annoying off idle flat spot.
(IMG:style_emoticons/default/popcorn[1].gif)


Mine is a unique case. I run the car above 7K RPM for autocross. I don't have any flat spots, but everything is tweaked to the 9's.
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GregAmy
post Mar 14 2019, 02:02 PM
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QUOTE(yeahmag @ Mar 14 2019, 01:28 PM) *
Mine is a unique case.

Mine too. Race only, cams/compression "warm" build by Foley.

The "Dellorto Bible" is a (poorly-edited) book, filled with excellent info about these carbs. I recall it recommends 34s, along with some baseline jetting/air correction info. Get a copy of it.

https://www.cbperformance.com/product-p/0101.htm

Street car is all D-Jet, all the time...
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rhodyguy
post Mar 14 2019, 04:31 PM
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I found the Del book from CB lacking. Severely. Nothing at all like the Weber book.
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rhodyguy
post Mar 14 2019, 04:48 PM
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If you want to farm the carb work out, try Blackline Racing in Murray Utah.
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flmont
post Mar 14 2019, 05:14 PM
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Thanks Guys,..which Carbs are the better ones,...weber or dellor
tos
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GregAmy
post Mar 14 2019, 07:07 PM
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QUOTE(flmont @ Mar 14 2019, 06:14 PM) *

Thanks Guys,..which Carbs are the better ones,...weber or dellortos

Oh no you did-int!!
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1adam12
post Mar 14 2019, 07:16 PM
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Visit Eurocarb for your genuine Dellorto parts. Someoneo on the forum here suggested it and I've made a few purchases through them to rebuild my DRLA 40's. There in England but ship fast and cheap to the U.S. !!!!!
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yeahmag
post Mar 15 2019, 11:22 AM
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QUOTE(flmont @ Mar 14 2019, 03:14 PM) *

Thanks Guys,..which Carbs are the better ones,...weber or dellor
tos


I personally find Dellorto's superior in their design, ability to be tuned, and driveability.
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MarkV
post Mar 15 2019, 01:28 PM
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I bought all of my rebuild parts and vents from this guy:

https://www.ebay.com/str/ALFA1750S-CARBURET...=p2047675.l2563

He is in Italy but he ships pretty fast. He recommended 34mm vents for my 2056 which is what I am running. My carbs came with 28's and the 34's made a huge difference.
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