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NAES
Samba Member
Joined: September 10, 2003
Posts: 2120
Location: AREA-52 Southern Killafornia
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 Posted: Sat May 21, 2022 11:17 pm Post subject: Dellorto whistle fix? |
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I just got my 36 Dells back from the rebuilder. Installed them and totally forgot about the evil whistle they make. I can't find those base gaskets with the little nub that fills the gap in the bottom of the carbs. A little light reading suggested a dab of silicone in each gap under the carb. I'm a little leery of a gob dropping out and into the engine so I'm turning to you all.
Any suggestions on what to do here? If silicone is safe then I'll go ahead and do it.
Thanks everyone. NAES
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David Miskov
Samba Member
Joined: December 29, 2003
Posts: 189
Location: New Jersey
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| Posted: Sun May 22, 2022 12:23 am Post subject: Re: Dellorto whistle fix? |
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| I filled mine years ago with JB weld. I have had no problem with them. |
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Rome
Samba Member
Joined: June 02, 2004
Posts: 9640
Location: Pearl River, NY
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| Posted: Sun May 22, 2022 7:56 am Post subject: Re: Dellorto whistle fix? |
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Small bit of gas tank repair epoxy, the type you knead into shape. Push the nib/formed cone firmly into the carb's formed hole, then use razor knife to cut off the epoxy that presses out beyond the surrounding carb surface. Cut off the excess before it hardens.
The whistle effect is similar to using a large acorn shell held between your hands in a certain way and blowing into it- very piercing and loud whistle. Neighbor kid showed that to me when I was a kid. |
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NAES
Samba Member
Joined: September 10, 2003
Posts: 2120
Location: AREA-52 Southern Killafornia
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| Posted: Tue May 24, 2022 4:49 am Post subject: Re: Dellorto whistle fix? |
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OK great. Thank you much guys.
NAES
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boxer74
Samba Member
Joined: July 03, 2011
Posts: 703
Location: Ontario, Canada
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| Posted: Tue May 24, 2022 5:33 am Post subject: Re: Dellorto whistle fix? |
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Anybody ever had this whistle or chirp with Weber IDFs?
I have a set of 40's that whistle or chirp during lean conditions, such as when stomping on it or during transition from idle circuit to mains (still tuning this out).
I think the new spanish IDF's (which I have) have the cold start circuit blocked. There are no plungers installed. I haven't heard of this being an issue for others so maybe my whistle is from something else?
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vwfye
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Joined: April 15, 2000
Posts: 7661
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| Posted: Tue May 24, 2022 9:10 am Post subject: Re: Dellorto whistle fix? |
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The fix is to shift. Seriously! If you shift right at the start of the whistle in each gear, you get great MPG!
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1980s Sand Dragster "The Plunger"
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j-dub
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Joined: November 09, 2003
Posts: 865
Location: Phoenix, AZ
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| Posted: Tue May 24, 2022 5:37 pm Post subject: Re: Dellorto whistle fix? |
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For the last few years I have been running 48 Dellortos and for whatever reason these just don't whistle like the smaller ones do. Maybe it is due to the position of the butterflies at light acceleration or the larger throttle bore leaves a smaller space for the gap where the cold start enrichment circuit could have existed.... I sort of miss it. Maybe I should put some 45s back on for next season.....
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modok
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Joined: October 30, 2009
Posts: 26781
Location: Colorado Springs
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| Posted: Tue May 24, 2022 6:20 pm Post subject: Re: Dellorto whistle fix? |
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| It is probably because the manifold matches the throttle bore. |
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j-dub
Samba Member
Joined: November 09, 2003
Posts: 865
Location: Phoenix, AZ
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| Posted: Tue May 24, 2022 6:31 pm Post subject: Re: Dellorto whistle fix? |
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Brilliant! That makes a ton of sense.
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boxer74
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Joined: July 03, 2011
Posts: 703
Location: Ontario, Canada
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| Posted: Wed May 25, 2022 4:41 am Post subject: Re: Dellorto whistle fix? |
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| boxer74 wrote: |
| Anybody ever had this whistle or chirp with Weber IDFs? |
Anybody?
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vwfye
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Joined: April 15, 2000
Posts: 7661
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| Posted: Wed May 25, 2022 7:58 am Post subject: Re: Dellorto whistle fix? |
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No, the layout of the idle circuit is different between the Dell and the Weber.
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1980s Sand Dragster "The Plunger"
LME "Little Giant Killer 3" |
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motomwo
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Joined: February 10, 2017
Posts: 263
Location: Oregon
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| Posted: Wed May 25, 2022 5:22 pm Post subject: Re: Dellorto whistle fix? |
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| boxer74 wrote: |
| boxer74 wrote: |
| Anybody ever had this whistle or chirp with Weber IDFs? |
Anybody? |
Yes, I did. The fix for me was to trim the gasket that is located between the carbs and manifolds to the hole size to match the top of the intake manifolds. Most of the idf manifolds have holes to fit 48 idfs.
So if you have smaller idfs and gaskets that match the carbs base that leaves material hanging out and acts like a whistles reed valve.
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1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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boxer74
Samba Member
Joined: July 03, 2011
Posts: 703
Location: Ontario, Canada
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| Posted: Wed May 25, 2022 5:32 pm Post subject: Re: Dellorto whistle fix? |
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| motomwo wrote: |
| boxer74 wrote: |
| boxer74 wrote: |
| Anybody ever had this whistle or chirp with Weber IDFs? |
Anybody? |
Yes, I did. The fix for me was to trim the gasket that is located between the carbs and manifolds to the hole size to match the top of the intake manifolds. Most of the idf manifolds have holes to fit 48 idfs.
So if you have smaller idfs and gaskets that match the carbs base that leaves material hanging out and acts like a whistles reed valve. |
Thank you! I was hoping for an answer like this. I will have to try this.
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jeffrey8164 
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Joined: January 06, 2018
Posts: 3817
Location: Georgia
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| Posted: Thu May 26, 2022 10:25 am Post subject: Re: Dellorto whistle fix? |
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https://vwparts.aircooled.net/Dellorto-DRLA-Anti-W...gasket.htm
Here they are but out of stock.
There is someone here in the classifieds that sells them too.
I can’t remember who but I got mine from them in 2018.
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boxer74
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Joined: July 03, 2011
Posts: 703
Location: Ontario, Canada
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| Posted: Thu Jun 02, 2022 1:19 pm Post subject: Re: Dellorto whistle fix? |
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| boxer74 wrote: |
| motomwo wrote: |
| boxer74 wrote: |
| boxer74 wrote: |
| Anybody ever had this whistle or chirp with Weber IDFs? |
Anybody? |
Yes, I did. The fix for me was to trim the gasket that is located between the carbs and manifolds to the hole size to match the top of the intake manifolds. Most of the idf manifolds have holes to fit 48 idfs.
So if you have smaller idfs and gaskets that match the carbs base that leaves material hanging out and acts like a whistles reed valve. |
Thank you! I was hoping for an answer like this. I will have to try this. |
I trimmed the gaskets to fit the holes in the manifolds and my chirp is gone. Thanks!
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brian rogers
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Joined: April 14, 2002
Posts: 137
Location: Salt Lake City, Utah
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| Posted: Thu Jun 02, 2022 1:58 pm Post subject: Re: Dellorto whistle fix? |
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| This months HotVWs has a tech article on the Dellorto carbs. They suggest an epoxy. |
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evanfrucht
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Joined: July 24, 2016
Posts: 2180
Location: Laurel Canyon, CA
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| Posted: Thu Jun 02, 2022 5:05 pm Post subject: Re: Dellorto whistle fix? |
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A thicker more ridged gasket material would most likely fix it.
The thin stock gasket acts like the reed in a wind instrument.
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j-dub
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Joined: November 09, 2003
Posts: 865
Location: Phoenix, AZ
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| Posted: Thu Jun 02, 2022 6:32 pm Post subject: Re: Dellorto whistle fix? |
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| boxer74 wrote: |
I trimmed the gaskets to fit the holes in the manifolds and my chirp is gone. Thanks! |
Excellent result!
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"POLICE STATION TOILET STOLEN ... Cops have nothing to go on." |
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motomwo
Samba Member
Joined: February 10, 2017
Posts: 263
Location: Oregon
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| Posted: Thu Jun 02, 2022 8:05 pm Post subject: Re: Dellorto whistle fix? |
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| boxer74 wrote: |
| boxer74 wrote: |
| motomwo wrote: |
| boxer74 wrote: |
| boxer74 wrote: |
| Anybody ever had this whistle or chirp with Weber IDFs? |
Anybody? |
Yes, I did. The fix for me was to trim the gasket that is located between the carbs and manifolds to the hole size to match the top of the intake manifolds. Most of the idf manifolds have holes to fit 48 idfs.
So if you have smaller idfs and gaskets that match the carbs base that leaves material hanging out and acts like a whistles reed valve. |
Thank you! I was hoping for an answer like this. I will have to try this. |
I trimmed the gaskets to fit the holes in the manifolds and my chirp is gone. Thanks! |
Cool! Glad I was able to be of help.
_________________
1961 Bug, 2276 cb wedge ports 44x37 11.1 comp fk10 1.5 rockers 48idf's 1 3/4" header Rancho pro street trans SAW axles Airkewld 4# narrowed beam, Koni shocks, Airkewld dis brake all around. 5.5/4.5 BRMs
1966 Bug, 2127, panchito heads, fk8, 1.3 rockers, dual 44idfs, 1 5/8 merge header, Rancho pro strt flyer, empi axles, Airkewld's 4" beam and discs all around and adjustable shocks. 4.5 & 5.5 BRMs |
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boxer74
Samba Member
Joined: July 03, 2011
Posts: 703
Location: Ontario, Canada
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| Posted: Fri Jun 03, 2022 4:48 am Post subject: Re: Dellorto whistle fix? |
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| motomwo wrote: |
| Cool! Glad I was able to be of help. |
Yes, thanks again.
What's odd is that the CB 3125 hexbar kit comes with gaskets sized for 40 IDF's. So that means that everyone would need to trim them.
I ordered a few gaskets for 48s for future use that will hopefully not require any trimming.
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