Reviving NOS Webers, Initial Settings? |
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Reviving NOS Webers, Initial Settings? |
bbrock |
Mar 20 2019, 08:55 PM
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#1
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
I didn't want to hijack the other thread but have a question about my own Webers. They are Italian 40IDFs I bought in the late 80s or early 90s. Other than finger tight bolting them on to my engine to see how cool they looked, they have never been used. No fuel has touched them. I don't remember if I even opened them to set the float levels. BUT... they were stored in a humid basement for several years before I moved to a civilized climate. So, the magnesium housing is tarnished on the outside and the plating has deteriorated on a few of the levers and such. Pretty minor stuff from what I can see.
My question: is there is anything special I should do or check other than inspecting for corroded parts and normal setup as I prep these for service? |
MarkV |
Mar 21 2019, 08:13 PM
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#2
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Fear the Jack Stands Group: Members Posts: 1,493 Joined: 15-January 03 From: Sunny Tucson, AZ Member No.: 154 Region Association: None |
If you are putting them on a fresh engine with fresh rings you are going to want to make sure that they are close to jetted and set up right before you fire your engine for the first time. Mine were set up all wrong and were sitting for a long time before I used them. If they are pig rich you are going to have a harder time getting your rings to seat properly.
(IMG:style_emoticons/default/smash.gif) |
Superhawk996 |
Mar 22 2019, 10:13 AM
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#3
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914 Guru Group: Members Posts: 5,723 Joined: 25-August 18 From: Woods of N. Idaho Member No.: 22,428 Region Association: Galt's Gulch |
If you are putting them on a fresh engine with fresh rings you are going to want to make sure that they are close to jetted and set up right before you fire your engine for the first time. Mine were set up all wrong and were sitting for a long time before I used them. If they are pig rich you are going to have a harder time getting your rings to seat properly. (IMG:style_emoticons/default/smash.gif) Good Point that I hadn't considered. (IMG:style_emoticons/default/blink.gif) However, I don't think they would ever end up that rich from a leaky float needle though. That would be the more likely case if the jets and emulsion (air) tubes are grossly wrong. A quick plug pull after a brief start up will show where the mixture is and should be done anyway regardless. This whole thing comes down to personality types. I'm a risk taker (see my signature). If you're a risk adverse person, I completely see the perspective of complete rebuild 1st. Honestly the concern I have is that in taking apart NOS carbs you risk losing little things like accelerator pump check balls and/or getting the accelerator pump linkage adjusted properly again once it has been disassembled. Likewise the risk of ethanol attacking the rubber is a longer term use vs. time degradation thing. Rubber stored in cool, dry dark, conditions ages pretty well. My main point of the initial push back on the desire to rebuild 1st is: 1) Carbs are more robust than people give them credit for. Especially in an age of fuel injection, carbs are now viewed with mystery and mythology that just isn't warranted. 2) Do you take apart NOS parts (never used) as an OCD thing just to "make sure". The crazy extension of this is -- do you take apart your new_______ (place item here, car, TV, washing machine) to make sure it was put together right before you use it for the 1st time. What if you could get a NOS Transmission? Would you take it apart to make sure the gaskets and/or O-ring seals hadn't dried out or would you run it for a bit and then go from there. Bottom line: Brent is fastidious and his attention to detail is top notch. He clearly has the ability to disassemble and reassemble with care. My money is betting that he's already ordered complete rebuild kits and has them apart on the bench already. (IMG:style_emoticons/default/biggrin.gif) |
bbrock |
Mar 22 2019, 11:46 AM
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#4
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914 Guru Group: Members Posts: 5,269 Joined: 17-February 17 From: Montana Member No.: 20,845 Region Association: Rocky Mountains |
Bottom line: Brent is fastidious and his attention to detail is top notch. He clearly has the ability to disassemble and reassemble with care. My money is betting that he's already ordered complete rebuild kits and has them apart on the bench already. (IMG:style_emoticons/default/biggrin.gif) Thanks for the vote of confidence. I'm also a risk taker by nature but the reason I parked the car for 35 years was because I was tired of the frequent unscheduled roadside repairs and needed more reliable transportation. Now is the time to put it back together right. One point about whether it is worth opening them up is that you have to open them to set the float level before first use anyway. Replacing diaphragms etc. is, of course, more work but I don't mind. That said, I just opened one of the carbs and it isn't pretty. Fing Midwest humidity! Nasty inside and every bit of plated hardware needs re-plating. I'm going to tear these down and may just take the bodies in for boiling out. Now for setup, I was going to start a new thread on this down the road but since we are talking about it anyway... Here's what I have. Mostly stock GA 2.0 engine. The only mods are a reground carb cam and Mahle flat top (Euro) spec pistons. I've been unsuccessful tracking down the cam specs but it was done through the old Automotion and I suspect was actually farmed out to Web Cam and is their 86 street carb grind. A few important notes before digging into the carbs. - My house is at 6,000 ft. elevation and the majority of my driving will be between 4,000 and 10,000 ft. - I will be install a bung for an O2 sensor for dialing in the carbs. - Within reason, mpg and reliability/longevity are more important to me than hp. I'm not looking for a hyper-mileing dog but like 30+ mpg highway and don't want to sacrifice fuel economy just to squeeze ever last muscle fiber out of the engine. You may ask why I am going with carbs then but that is another story and FI may be a future project. For now, it is these carbs. The carbs: I have the following: Venturi - 28 Emulsion tubes - F11 Main jet - 115 Correction Jet - 200 Any other numbers I should post? What can you tell me about initial setup? Also, these carbs actually did come set up with port vacuum. They are drilled and blanked on both the port and manifold sides and the port side already has a tube fitting installed. (IMG:style_emoticons/default/piratenanner.gif) |
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