I found a cheap DFEV that came off an air-cooled VW.
I'll be rebuilding it because it's old and filthy and because i enjoy that sort of thing. Also because E10 and the possibility of E15 fuel scares me, so i'd like to have viton or better in sensitive positions that would have had lesser materials in the past. I've never rebuilt a carburetor but I'm an amateur watchmaker and if i can strip, clean, lube, and reassemble a watch successfully a carburetor can't be particularly tricky.
Though i'm anxious to hear if there are particular assembly tips. I assume the rules for disassembly are much like a watch - Use the right driver, don't force it, etc.
Don't tell me not to bother - this is something i will be doing for fun on a rainy day. I'm that big of a nerd.
What i need to know is, what are the jet sizes and emulsion tube numbers that would be appropriate for the 1756cc engine that currently has no modifications but will be de-smogged and probably get a new exhaust system. Or at least headers. It's a '77 federal emissions vehicle.
Thanks!
re-jetting a Weber 32/36 DFEV from VW to Fiat?
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TimpanogosSlim
- Posts: 237
- Joined: Wed Feb 06, 2013 12:45 pm
- Your car is a: 1977 124 Spider
-
TimpanogosSlim
- Posts: 237
- Joined: Wed Feb 06, 2013 12:45 pm
- Your car is a: 1977 124 Spider
Re: re-jetting a Weber 32/36 DFEV from VW to Fiat?
Well I'm spending a good $50 on rebuild parts, but i only paid $50 for the carb. If this weren't intended as a learning experience i would recommend getting a brand new one from webercarbsdirect for $200.
Every diaphragm needs replaced. The choke diaphragm is not something i could get from the usual online vendors so i found a NOS one on eBay for $20 shipped. Highway robbery.
I'm just glad i didn't buy used for $100 from whatever boob is listing them ridden hard & put away wet at $100 on ebay.
It's been suggested that i could use the 34 DMSA jetting for the 1756cc fiat engine (which is known) as a starting point for the DFEV because they are fairly similar.
I found that there are two documented factory configurations for the 34 DMSA on the 1800 engine.
mains: 145/145
airs: 180/165
idles: 50/60
pump: 55
tubes: F61/F61
needle: 1.75
mains: 140/145
airs: 165/155
idles: 50/60
pump: 50
tubes: F7/F7
needle: 1.75
So far i haven't figured out how to remove the emulsion tubes without damaging them so i don't know what emulsion tubes i have. I'm going to pick up one of those buckets of solvent and soak the parts for a day and then try again.
Here is what i found so far in my ex-VW carb:
mains: 137/155
airs: 180/210
idles: 50/55
pump: 50
tubes: unknown
needle: forgot to check
It would appear that if i have F7 emulsion tubes (unobtanium as a new DFEV part - from the usual vendors anyway. google is No Help because they are widely available for the IDF but the IDF part isn't the same) i could buy a 145 main, a 155 air, and a 60 idle and be pretty close to the 2nd set of specs.
If i didn't get my primary and secondary air corrector jets swapped then i really don't understand the way this carb was set up.
F61 emulsion tubes for the DFEV are obtainable. At any rate i hope i find something useful when i get those out. Also, like most people, I don't understand how the emulsion tube's characteristics relate to the number they are assigned.
Every diaphragm needs replaced. The choke diaphragm is not something i could get from the usual online vendors so i found a NOS one on eBay for $20 shipped. Highway robbery.
I'm just glad i didn't buy used for $100 from whatever boob is listing them ridden hard & put away wet at $100 on ebay.
It's been suggested that i could use the 34 DMSA jetting for the 1756cc fiat engine (which is known) as a starting point for the DFEV because they are fairly similar.
I found that there are two documented factory configurations for the 34 DMSA on the 1800 engine.
mains: 145/145
airs: 180/165
idles: 50/60
pump: 55
tubes: F61/F61
needle: 1.75
mains: 140/145
airs: 165/155
idles: 50/60
pump: 50
tubes: F7/F7
needle: 1.75
So far i haven't figured out how to remove the emulsion tubes without damaging them so i don't know what emulsion tubes i have. I'm going to pick up one of those buckets of solvent and soak the parts for a day and then try again.
Here is what i found so far in my ex-VW carb:
mains: 137/155
airs: 180/210
idles: 50/55
pump: 50
tubes: unknown
needle: forgot to check
It would appear that if i have F7 emulsion tubes (unobtanium as a new DFEV part - from the usual vendors anyway. google is No Help because they are widely available for the IDF but the IDF part isn't the same) i could buy a 145 main, a 155 air, and a 60 idle and be pretty close to the 2nd set of specs.
If i didn't get my primary and secondary air corrector jets swapped then i really don't understand the way this carb was set up.
F61 emulsion tubes for the DFEV are obtainable. At any rate i hope i find something useful when i get those out. Also, like most people, I don't understand how the emulsion tube's characteristics relate to the number they are assigned.