 idle jets, mixed sizes |
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| Petepat |
 Aug 27 2023, 11:33 AM
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#1
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Member  Group: Members Posts: 60 Joined: 1-December 19 From: Florida Member No.: 23,691 Region Association: None  |
Got a 1.7L engine with Dellorto Carbs which I took out the idle jets and notice on one side they are both 50 but on the other side they are marked 55 and 52 could there be a reason for this or a case of anything goes?
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| technicalninja |
Aug 27 2023, 02:11 PM
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#2
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Senior Member Group: Members Posts: 1,309 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region 
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The altitude will mess with me here...
For Texas (600ft altitude) I'd use basic carb size of 40, venturis of 32, main jet of 130-140, air jet of 180-210, and idle jet of 50 or 55. Due to the 7k plus altitude I'd expect that to need jets a bit smaller than what I listed above and maybe a venturis size of 30. Whatever I did I'd be checking the actual mixture with a properly placed wideband O2 set up. The 7k altitude has lowered the available oxygen by a significant amount. Cars run like CRAP in Denver Colorado 6k versus Texas (600ft). A 10 second 1/4 mile pass in Dallas is a 12.5 pass at Bandimere in Colo. Less oxygen should require less fuel and equal LESS FUN! Your main jets are way, way, off! I bet you're running 10.5/1 AFRs, and you will end up wiping the motor out via oil dilution with fuel. Get a wideband and main jets that are a shitload smaller! |
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Posts in this topic
Petepat idle jets Aug 27 2023, 11:33 AM
technicalninja Check the venturis!
The Datsun Z 3X2 set up s... Aug 27 2023, 12:16 PM
CCE
Check the venturis!
The Datsun Z 3X2 set up ... Aug 27 2023, 01:49 PM brant Run a compression test
I’ve seen carbs with diff... Aug 27 2023, 02:02 PM brant That car will benefit greatly from smaller vents. ... Aug 27 2023, 02:25 PM technicalninja
Run a compression test
I’ve seen carbs with dif... Aug 27 2023, 02:35 PM rfinegan They would all be the same..They may have been dri... Aug 27 2023, 02:35 PM Jack Standz +1 on the possibility that they have been drilled.... Aug 27 2023, 03:37 PM porschetub
Got a 1.7L engine with Dellorto Carbs which I too... Aug 27 2023, 04:57 PM |
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