Vintage56
Active Member
@Stevehose thank you for the clarifications.....Do you have a photo of the small hole in each carb to vent the idle mixture screws? There are several "holes" in the top of the carb of various sizes. TY....
See adjustment #2@Stevehose thank you for the clarifications.....Do you have a photo of the small hole in each carb to vent the idle mixture screws? There are several "holes" in the top of the carb of various sizes. TY....
and needle valve cleaningPERFECT...
Gaskets and hole clearance next....
UPDATE TO ALL:
Yesterday I started the E9 and she started right up after installing some of the pieces that came with the carb rebuild kits. Waited for the idle to settle and took her for a ride. No flooding. All good so far, except I now have a slightly higher idle speed (about 1000-1100) and a richer fuel mixture (slight amount of smoke at fully warmed up idle). (Compression is about 180 in all 6 cylinders as I had that checked by my mechanic before I bought the car.) I know I didn't alter anything as I only worked with the top sections of the carbs and didn't reset anything else. Any suggestions?
I am not sure with Zeniths which screws control idle speed and mixture. I don't want to fiddle with stuff until I have a pretty good idea I know what I should be doing. I am not confident to readjust everything since this will be way above my pay-grade. Right now the car starts, idles and runs without surging or stalling. It's just a heavy smell of carbon monoxide and a slightly higher idle speed. So I know I am pretty darn close. I also do not have any hesitation up the RPM range and when coming out of a standstill....But perhaps that's because she's too rich?
Thanks for any input...
Merry Christmas to all.
Enjoy your holidays, If you need the Blue book info let me know and I will post or send it after I return from camping.Thanks for the feedback, I appreciate the immediate responses and sage advice on this Forum! Thanks all
Merry Christmas.
Thank you, that would be very helpful. Enjoy camping!Enjoy your holidays, If you need the Blue book info let me know and I will post or send it after I return from camping.
Thank you deQuincey! You've been extremely helpful throughout this issue.this guy has some idea…
and…
Thank you deQuincey! You've been extremely helpful throughout this issue.
It looks like that change was from October 1973 onwards so since my July 1970 carbs still had the original leather accelerator pump cups, which were also recommended for replacement, I'm pretty sure my carbs don't have the new improved vent chimney. I'll have to pull out the photos I took while I had them apart. I bought some spare carbs a while back that I'll check to see which version they have. I did have a carb flooding issue with one of my carbs a while back so this is more than an academic issue for me.About halfway through the Zeniths manual on this site: https://e9coupe.com/tech/zeniths/bmw1/bmw1.html in the 'overhaul' section, there's a warning about replacing the tower with a vent chimney which discharges excess/flooded fuel directly into one of the carburettor chokes - see below
The chimney shows up clearly on this parts image: http://bmwfans.info/parts-catalog/E...aration_system/carburetor_cap_piston_float_2/
When E3s were plentiful, I picked some up to make the change - I read it as a safety matter.
I guess that if there's a serious fuel flood and it's directed down the choke, the effect will be to stop the engine.
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