 1.9 l with Webers jet size question |
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| Tim17 |
 Apr 11 2024, 03:10 PM
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#1
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Member  Group: Members Posts: 52 Joined: 3-December 23 From: Newburyport, Massachusetts Member No.: 27,769 Region Association: North East States 
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I’ve bought a 1975 1.8l that the previous owner rebuilt the engine to 1.9l but it hasn’t run yet.
New NPR 96mm pistons and cylinders Web cam and lifters from Pelican. (Carb engine cam) 009 distributor ( advance curves to go with cam and carbs) Twin Weber 40 IDF carbs Getting ready to reinstall the engine after doing hell hole surgery and repair. The main jets are labeled 115. Questions : 1)Is that a good jet starting point for tuning this engine configuration? 2) Should I weld in bungs for O2 sensors in the exhaust for tuning? 3). Recommendations on what break-in oil to use? Thanks Tim |
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| technicalninja |
Apr 11 2024, 03:55 PM
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#2
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Senior Member Group: Members Posts: 1,273 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region
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you will need 28mm main venturis.
I'd start with 130 mains, 200 air correction, stock F11 emulsion tubes and 50 idles. Pierce manifolds is the best source for stuff IMO. Yes to WB02! |
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| nditiz1 |
Apr 11 2024, 04:42 PM
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#3
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Senior Member Group: Members Posts: 1,190 Joined: 26-May 15 From: Mount Airy, Maryland Member No.: 18,763 Region Association: MidAtlantic Region
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Agree with techninja except the main. I'd start with 115 and work up from there.
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| Tim17 |
Apr 11 2024, 06:07 PM
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#4
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Member Group: Members Posts: 52 Joined: 3-December 23 From: Newburyport, Massachusetts Member No.: 27,769 Region Association: North East States
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@technicalninja and @nditiz1
Thanks I’ll do some more digging and figure out what’s in these carbs for the other components. Tim |
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| Tim17 |
Apr 12 2024, 11:12 AM
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#5
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Member Group: Members Posts: 52 Joined: 3-December 23 From: Newburyport, Massachusetts Member No.: 27,769 Region Association: North East States
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QUOTE(Tim17 @ Apr 11 2024, 06:07 PM)  @technicalninja and @nditiz1 Thanks I’ll do some more digging and figure out what’s in these carbs for the other components. Tim The PO seems to have the right setup for starters 115 main 28 mm venturis 50 idle F11 emulsion tubes 200 air correction Will add the WB02 and figure out if I need to change something. Thanks Tim |
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| technicalninja |
Apr 12 2024, 02:06 PM
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#6
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Senior Member Group: Members Posts: 1,273 Joined: 31-January 23 From: Granbury Texas Member No.: 27,135 Region Association: Southwest Region
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You got LUCKY!
I still think the mains need to be fatter, but the WB readings will show which way to go for sure. One problem I've seen a bunch recently is shaft bearings getting rough. They didn't have enough lubricant when they were new, and most are old now. Turn throttle shafts by hand. Should be perfectly smooth/no sticky spots! Almost all of the 4 sets I have now need new bearings and throttle shafts. Out of 8 Carbs only 3 are OK... |
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| Tim17 |
Apr 12 2024, 04:19 PM
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#7
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Member Group: Members Posts: 52 Joined: 3-December 23 From: Newburyport, Massachusetts Member No.: 27,769 Region Association: North East States
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QUOTE(technicalninja @ Apr 12 2024, 02:06 PM) You got LUCKY! I still think the mains need to be fatter, but the WB readings will show which way to go for sure. One problem I've seen a bunch recently is shaft bearings getting rough. They didn't have enough lubricant when they were new, and most are old now. Turn throttle shafts by hand. Should be perfectly smooth/no sticky spots! Almost all of the 4 sets I have now need new bearings and throttle shafts. Out of 8 Carbs only 3 are OK... Thanks, the shafts turn smoothly, not sure how much use these carbs have gotten. I lubed them with light oil. |
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