Lotus Elan

S4 No Fuel

PostPost by: SENC » Wed May 11, 2022 12:18 am

I can see your problem. I rechecked the book and found nothing similar - odd, clearly 1 thing stamped over the other, but the 3175 would give me some confidence I think. Is the rear also stamped 3175?

I'd double check your needles to see if they match. I doubt this is contributing to your problem unless there is a mismatch in needles with jets effectively shutting off the fuel flow. Looking at the jets, are they recessed from the bottom face of the chamber by roughly the right amount (thinking too high may restrict fuel flow as they'd be filled with the wider section of the needle).
Henry
69 Elan S4
65 Seven S2
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PostPost by: Temmck » Wed May 11, 2022 2:06 am

Yes, the other is clearly 3175R. You may have to zoom a bit to see it.

I check the needles tomorrow. i also reached out to Ken at DB to see if they have replacement needles and jets or preferably a conversion to adjustable pistons and needles.
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PostPost by: Temmck » Thu May 12, 2022 4:11 am

Needles are both B1G.
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PostPost by: Temmck » Thu May 12, 2022 4:27 am

Jet heights are both the same. 0.06" (1.59mm) to shoulder of jet and 0.086" (2.19mm) to center of jet.

Both needles seem to be recessed in the piston, not flush.

If I understand correctly, my jets may be a little too high (lean) but my needles are more recessed (rich) so, maybe about right overall.
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