 Jetting Advice for Dellorto's, Would be appreciated |
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| mharrison |
 May 30 2005, 09:20 PM
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#1
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Why do I bother????  Group: Members Posts: 633 Joined: 8-September 03 From: Madison, MS Member No.: 1,123  |
Looking for some jetting advice on my Dual 40mm Dellortos
My engine is: 1.7 liter case align bored & galley plugs threaded and sealed Pistons: Forged 94mm Balanced. Crankshaft: 71mm refinished and Balanced. Camshaft: #86 Grind. .423 Lift, 270 Duration. Heads Rebuilt with 44mm x 38mm valves (vs. Stock is 39mm x 33mm ) High Carbon steel pushrods. Lightened Flywheel I appreciate any input you guys might have. I suspect these are currently jetted for an Alpha Romeo as I got them from a guy in Italy. |
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| SirAndy |
May 30 2005, 11:53 PM
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Resident German Group: Admin Posts: 41,681 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
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| skline |
May 31 2005, 12:31 AM
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#3
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Born to Drive Group: Members Posts: 7,910 Joined: 26-December 02 From: Costa Mesa, CA Member No.: 17 Region Association: Southern California |
Sounds to me like you built a beefy 2 liter with some good reliable parts. My advice, since you got the best carbs for the car, contact CB Performance tomorrow on the phone, Ask for Marieann, she will be able to tell you exactly what you need for your engine. tell her everything you posted here. They will most likely have everything you need there too. Know what you have when you call, pull the correction tubes and jets out and know the numbers as she will ask you. She knows her stuff and is more than happy to assist you. The dells are the best carb for our motors, you wont be dissapointed. They outflow the Webers anyday and you wont have to adjust them all the time like the Webers.
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| Gary |
May 31 2005, 07:08 AM
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#4
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Senior Member Group: Members Posts: 744 Joined: 12-January 03 From: Mount Airy, MD Member No.: 134 Region Association: MidAtlantic Region 
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Good jetting advice on this thread.
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| mharrison |
May 31 2005, 07:20 AM
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#5
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Why do I bother???? Group: Members Posts: 633 Joined: 8-September 03 From: Madison, MS Member No.: 1,123 |
Here is Jake's advice on another thread. He mentioned a 2.0 or little bigger engine with stock components. I wonder how much my cam and larger valves might effect these suggestions?
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| mharrison |
Jun 2 2005, 09:44 PM
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#6
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Why do I bother???? Group: Members Posts: 633 Joined: 8-September 03 From: Madison, MS Member No.: 1,123 |
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| tommy914 |
Jun 2 2005, 10:49 PM
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#7
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Life is a journey, enjoy every turn. Group: Members Posts: 1,103 Joined: 15-September 03 From: Ridgeland, MS Member No.: 1,165 Region Association: None |
Sorry Matt, I have those crazy Weber carbs.
I'd check with CB performance, but plan a buying several sizes of idles and mains. |
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| MecGen |
Jun 3 2005, 04:48 AM
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#8
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8 Easy Steps Group: Members Posts: 848 Joined: 8-January 05 From: Laval, Canada Member No.: 3,421 |
Hi
I am running 36 Dells, I screwed with the jets forever. I spoke with GPR and they gave me a setup (I think it was Dave ), that was 10 years ago and going strong. My motor 2.0 sounds like yours. Great choice of carrbs. If you don't find what you need, I can bang out a few jets to check on the sizes, if your not in a hurry. Later Joe (IMG:http://www.914world.com/bbs2/html/emoticons/beerchug.gif) |
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| groot |
Jun 3 2005, 06:36 AM
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#9
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Dis member Group: Members Posts: 896 Joined: 17-December 03 From: Michigan Member No.: 1,444 |
Jake's advice is pretty damn close to what I run. My pump jets are a little smaller, but I'd change to the bigger ones if I had them.
180 main air 34mm vent (mine actually measure more like 33mm) 60 idle 140 main gas 30 pump jets When it doesn't have foreign material in the idle circuit (grass) it runs pretty decent. I had socks over the velocity stacks and didn't have anything protecting the idle air and main air jets. USE GOOD FILTERS!!!! |
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| Pugbug |
Jun 3 2005, 06:44 AM
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#10
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Member Group: Members Posts: 449 Joined: 14-February 05 From: Victoria, BC Member No.: 3,604 |
I have a 1911cc engine with the same cam as yours. I'm running 45 dells. Over kill, but it runs and idles great.
38 mm vents 180 airs 160 mains 70 idles 55 pump |
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