TheSamba.com :: View topic

Wed Oct 02, 2019 3:35 pm

First off is the Dellorto “chirp” a leak/issue?

I’m familiar with IDFs but not dellortos. I’m assuming I would just jet them the same as I would a set of 44idfs with 38mm vents? Figured I would start with 55 idles, 155 mains and 200 airs...

I was going to get 48idfs for my 2276 (tims heads, web 86b and 1 5/8” exhaust) but I’m gonna give a set of Dellorto 45s a shot.

Wed Oct 02, 2019 4:14 pm

condition of Dells????Rebuilt, NOS, used and just cleaned up??? Pay the money and have old set rebuilt and run tested. I sent a NOS set out and had them rebuilt as gaskets 40 years old crack. And the money I spent to have run tested...………...priceless. The engine was also a 2276

Wed Oct 02, 2019 4:21 pm

wheel607 wrote: condition of Dells????Rebuilt, NOS, used and just cleaned up??? Pay the money and have old set rebuilt and run tested. I sent a NOS set out and had them rebuilt as gaskets 40 years old crack. And the money I spent to have run tested...………...priceless. The engine was also a 2276

They’re being rebuilt but that’s beside the point. My questions are stated in my original post. When the history of the carbs affect the answers to my questions I will be sure to post more info but they don’t in this case.

I’ve never dealt with dellortos so I want to know the answers to the questions asked so please just answer the questions I’ve asked. I don’t even have them yet and am only about 90% sure i’ll buy them. Not looking for a debate on Weber’s vs dells or anything I’m just learning what I can before I have them.

I see the chirp is from a void in the base of the carb. That would be a leak correct? I see some people aren’t bothered by it though so... not a leak?

Do they jet like a Weber IDF?

I know I sound like a jerk. It’s just tough most of the time to keep on topic.

Wed Oct 02, 2019 4:29 pm

The "Dell'orto whistle" is from a void on the base of the carb, They make a rubber carb/manifold gasket that has a nub to fill that void, Dell's jet from the top, both idle/main, etc, not idles on the side like a weber, Not sure who has those gaskets, some just epoxy the void, but I would'nt chance it..........

Wed Oct 02, 2019 4:36 pm

webebuggin wrote: The "Dell'orto whistle" is from a void on the base of the carb, They make a rubber carb/manifold gasket that has a nub to fill that void, Dell's jet from the top, both idle/main, etc, not idles on the side like a weber, Not sure who has those gaskets, some just epoxy the void, but I would'nt chance it..........

Looks like acn has them. So it’s a issue then and not just an irritation?

Wed Oct 02, 2019 4:48 pm

I’m running 45 DRLAs on a 2276, with web 86B, 1 5/8” exhaust and 9.3:1 CR. I am also running a CB Digital Distributor, and have tuned for lean progression.

Jet sizing is measure differently on DRLAs, and I would expect you to be closer at 60 idle and 155/160 main, with .2 emulsions and 180/200 Airs.

Alan

Wed Oct 02, 2019 5:00 pm

HBRag wrote: I’m running 45 DRLAs on a 2276, with web 86B, 1 5/8” exhaust and 9.3:1 CR. I am also running a CB Digital Distributor, and have tuned for lean progression.

Jet sizing is measure differently on DRLAs, and I would expect you to be closer at 60 idle and 155/160 main, with .2 emulsions and 180/200 Airs.

Alan

Exactly the info I was looking for. I’ll just have to be sure I get the emulsion difference. Your jetting matches what I was assuming I would start with.

What do you think of them on your motor? Ever wish you went bigger?

Wed Oct 02, 2019 5:18 pm

webebuggin wrote: The "Dell'orto whistle" is from a void on the base of the carb, They make a rubber carb/manifold gasket that has a nub to fill that void, Dell's jet from the top, both idle/main, etc, not idles on the side like a weber, Not sure who has those gaskets, some just epoxy the void, but I would'nt chance it..........
Epoxy and gas and enough time does not work. Por15 por patch will not be affected by gas.

Dan

Wed Oct 02, 2019 5:21 pm

ekacpuc wrote: HBRag wrote: I’m running 45 DRLAs on a 2276, with web 86B, 1 5/8” exhaust and 9.3:1 CR. I am also running a CB Digital Distributor, and have tuned for lean progression.

Jet sizing is measure differently on DRLAs, and I would expect you to be closer at 60 idle and 155/160 main, with .2 emulsions and 180/200 Airs.

Alan

Exactly the info I was looking for. I’ll just have to be sure I get the emulsion difference. Your jetting matches what I was assuming I would start with.

What do you think of them on your motor? Ever wish you went bigger?
It's true that the Dellorto jets measure differently that they do on Weber carbs.

I drive a 2180 with mostly the same spec as your engine. Heads, cam, exhaust, carbs (45 Dellorto) all the same. I run 50 idle jets and the engine responds rather well. IIIRC, my main jets are 170 and the AC is 180. I don't recall the venturi size ATM.

Make sure to set the float level at 5-6mm with the gasket in place. It makes a difference.

Fuel pressure should be at or below 3.5psi.

The Dellorto chirp is normal. As stated above, you can get a set of carb anti-chirp base gaskets for $39.00 last time I checked at ACN. But I kind of like the chirp sound during acceleration. YMMV!

Good Luck.

Wed Oct 02, 2019 5:57 pm

67rustavenger wrote: ekacpuc wrote: HBRag wrote: I’m running 45 DRLAs on a 2276, with web 86B, 1 5/8” exhaust and 9.3:1 CR. I am also running a CB Digital Distributor, and have tuned for lean progression.

Jet sizing is measure differently on DRLAs, and I would expect you to be closer at 60 idle and 155/160 main, with .2 emulsions and 180/200 Airs.

Alan

Exactly the info I was looking for. I’ll just have to be sure I get the emulsion difference. Your jetting matches what I was assuming I would start with.

What do you think of them on your motor? Ever wish you went bigger?
It's true that the Dellorto jets measure differently that they do on Weber carbs.

I drive a 2180 with mostly the same spec as your engine. Heads, cam, exhaust, carbs (45 Dellorto) all the same. I run 50 idle jets and the engine responds rather well. IIIRC, my main jets are 170 and the AC is 180. I don't recall the venturi size ATM.

Make sure to set the float level at 5-6mm with the gasket in place. It makes a difference.

Fuel pressure should be at or below 3.5psi.

The Dellorto chirp is normal. As stated above, you can get a set of carb anti-chirp base gaskets for $39.00 last time I checked at ACN. But I kind of like the chirp sound during acceleration. YMMV!

Good Luck.

Thanks. That answers the chirp question, that it doesn’t hurt anything.

Thanks again.

Wed Oct 02, 2019 6:45 pm

"Dellorto Whistle"

Some hate it, other's love it. Doesn't hurt anything.

Wed Oct 02, 2019 7:04 pm

In my experience also as mentioned it’s the idle jets that are numbered on flow not size , the main and air seem to match jet ID size . Also get your idle jets from 1 supplier . I’m sure ACN’s idles are good , also Alfa1750 on eBay are good .
Also main jet tip in is more related to float height then Air corrector size like and IDF .I measure float height holding the top just over vertically and use a 5mm drill bit as a guide .
I’m using facet low pressure clacker pumps on 2 cars for years without a regulator and no issues but works for me may not for you.

Wed Oct 02, 2019 7:40 pm

:D Big fan of the Dellorto whistle! You only hear it during a light acceleration like when you are going through residential neighborhoods, not on cruise or wide open.

I also have a simple 2276, Tim's stage 2 heads, 1 5/8 A1 exhaust. I have found the 45s with 38 vents work very well. I have tried 48 DRLAs with 40 vents briefly and found the transition lazy, I am currently running the 48s with 38 vents just for fun. Yes, they jet very similarly to the Weber IDFs, maybe a bit bigger idle jet.

Wed Oct 02, 2019 8:12 pm

Lots of good info here.

I hoped the whistle wasn’t harmful. Adds character, between the straight cut gears (hardly hear it) and the sound of the Weber’s its not super quiet anyways.

Glad to hear they’re similar jetting to IDFs.

I figured 45s or 48s is give and take. 45s with 38mm vents will be cool for the street and sometimes I get to go off-road a bit.

Thanks again guys!

Wed Oct 02, 2019 10:16 pm

ekacpuc wrote: HBRag wrote: I’m running 45 DRLAs on a 2276, with web 86B, 1 5/8” exhaust and 9.3:1 CR. I am also running a CB Digital Distributor, and have tuned for lean progression.

Jet sizing is measure differently on DRLAs, and I would expect you to be closer at 60 idle and 155/160 main, with .2 emulsions and 180/200 Airs.

Alan

Exactly the info I was looking for. I’ll just have to be sure I get the emulsion difference. Your jetting matches what I was assuming I would start with.

What do you think of them on your motor? Ever wish you went bigger?

I’ve got a full length A-1 Sidewinder exhaust, with full street setup. Getting transition to smooth out has been a bit challenging with the 38mm venturies. I tried smaller vents, and then went back to 38s after I got the ignition curve dialed in. I’ve got a set of 48 Tri-Jets on the shelf, but don’t feel I would gain anything without a different exhaust. All in all, I think the 45s are a good choice for the street. The engine has had some significant head work, and dyno’d just over 190HP on a engine dyno, which I am happy with.

As far as jets go. I have a lot of old jets from different sources. There can be a wide variance on what a given # jet will flow. As you dial in idle, you’ll be better off sourcing from one place. Your ignition setup can swing your jetting considerably. With a vacuum sensitive ignition I am running 16:0:1 to 17.5:1 through most of my progression, up to about 4000 RPM. Based on my flow tests, and jets from Europe, my flow is in the range of a typical 58 or 59 idle jet (I’ve match flowed my jet).

For main jet, with lean tune, A 160 starts at 12.5:1 at 3500 and ends up at 13.1:1 by 6500. The the 158 main is closer to ideal on the meter, but doesn’t transition as well. I’m also running .3 emulsions tune currently, with 200 airs and a 5mm float level. It’s not perfect, but very drivable. As the tuning continues, I may try the .2 emulsions most use again.

John and Modok have posted a ton of info here that really helped me understand what’s i was looking at and should expect. I seem to get to additional tuning every few months, at that rate I’m not sure I will ever know as much as what they have shared here.

Hope it helps.

Alan

Thu Oct 03, 2019 2:56 am

HBRag wrote: ekacpuc wrote: HBRag wrote: I’m running 45 DRLAs on a 2276, with web 86B, 1 5/8” exhaust and 9.3:1 CR. I am also running a CB Digital Distributor, and have tuned for lean progression.

Jet sizing is measure differently on DRLAs, and I would expect you to be closer at 60 idle and 155/160 main, with .2 emulsions and 180/200 Airs.

Alan

Exactly the info I was looking for. I’ll just have to be sure I get the emulsion difference. Your jetting matches what I was assuming I would start with.

What do you think of them on your motor? Ever wish you went bigger?

I’ve got a full length A-1 Sidewinder exhaust, with full street setup. Getting transition to smooth out has been a bit challenging with the 38mm venturies. I tried smaller vents, and then went back to 38s after I got the ignition curve dialed in. I’ve got a set of 48 Tri-Jets on the shelf, but don’t feel I would gain anything without a different exhaust. All in all, I think the 45s are a good choice for the street. The engine has had some significant head work, and dyno’d just over 190HP on a engine dyno, which I am happy with.

As far as jets go. I have a lot of old jets from different sources. There can be a wide variance on what a given # jet will flow. As you dial in idle, you’ll be better off sourcing from one place. Your ignition setup can swing your jetting considerably. With a vacuum sensitive ignition I am running 16:0:1 to 17.5:1 through most of my progression, up to about 4000 RPM. Based on my flow tests, and jets from Europe, my flow is in the range of a typical 58 or 59 idle jet (I’ve match flowed my jet).

For main jet, with lean tune, A 160 starts at 12.5:1 at 3500 and ends up at 13.1:1 by 6500. The the 158 main is closer to ideal on the meter, but doesn’t transition as well. I’m also running .3 emulsions tune currently, with 200 airs and a 5mm float level. It’s not perfect, but very drivable. As the tuning continues, I may try the .2 emulsions most use again.

John and Modok have posted a ton of info here that really helped me understand what’s i was looking at and should expect. I seem to get to additional tuning every few months, at that rate I’m not sure I will ever know as much as what they have shared here.

Hope it helps.

Alan

Yeah helps a lot. I try to buy everything I possibly can from John at ACN. Only time i don’t is if he doesn’t have it. So that’s where i’ll get my jets from.

My carb tuning is limited to Weber IDFs, Kadrons, 34pict, Kawasaki Carbs and a Holley 750. So any info helps.

I was worried it would be like the Holley in the way that they/it tune like nothing else I’ve worked with. Sounds like the jetting varies a little between jets (the flow I mean) and the emulsions are listed a totally different way than IDFs. I actually have been learning about megasquirt for the past few months and thought I would go efi but the wife talked me out of it. Crazy because she isn’t a gear head but the wisdom she sometimes shares is impressive.

190hp would be a beast. I was shooting for 170 (no dyno, just a reasonable number) but now realize i’ll Likely get to around 160 due to the fact I’m not super great at tuning.

I’m hoping to squeeze in a crank trigger kit. We’ll see how I do on my budget. I never felt right about the distributor gear (a story for another time).

Thu Oct 03, 2019 3:58 am

Hey the Dellorto jet doctor kit says to secure the lead balls in the holes so they’re flush. How do you secure them?

I was thinking I would just install them before I got a plugged idle jet. I do have the cast air filter housing. Are the dellortos prone to plugged idles like Weber’s?

Thu Oct 03, 2019 7:15 am

Dellorto anti-whistle gaskets:https://www.thesamba.com/vw/classifieds/detail.php?id=751082

Thu Oct 03, 2019 8:11 am

ekacpuc wrote: Hey the Dellorto jet doctor kit says to secure the lead balls in the holes so they’re flush. How do you secure them?

I was thinking I would just install them before I got a plugged idle jet. I do have the cast air filter housing. Are the dellortos prone to plugged idles like Weber’s?

They’re a bit oversized for a press fit. I just tapped them in with a center punch and since they’re soft they conform nicely. No adhesive or sealant required.

I’m running dual 45s on a 2276 as well. Web 86a and CB 044 Mags 42x37.
Currently, 38 Vents, 162 mains, 70 idle, 55 pump, 200 air .2 emulsion. That’s how they came out of the box from CB way back when.

I just did the first start the other day and it started right up and ran at 3000rpm for 20 minutes no problem.

I haven’t done any fine tuning yet though.

Thu Oct 03, 2019 8:19 am

ekacpuc wrote: Hey the Dellorto jet doctor kit says to secure the lead balls in the holes so they’re flush. How do you secure them?

I was thinking I would just install them before I got a plugged idle jet. I do have the cast air filter housing. Are the dellortos prone to plugged idles like Weber’s?

Browse through Modok's advice in this thread, he makes some compelling points.

https://www.thesamba.com/vw/forum/viewtopic.php?p=9089345&highlight=90+degrees#9089345