[jrchevy87]

i have the holley/weber 5200 and the jets went missing and i cant get any locally so i'm gonna tap the carb for a standard Holley jet but i dont know what the stock jetting is or the holley equivelent.. any help is well appreciated

[ethangsmith]

You can go that route, or you can pick up some Weber DFV jets. They are the same, because the 5200 is a DFEV carb. As for the sizing, Ford used some weird numbers. I am working on figuring out the conversion because I want to rejet my 5200 I run on my Capri.

[jrchevy87]

i emailed weber to ask them if the dfv jets were the same but they said they were different so i called holley and they told me the only place to get them is daytona performance(the number they gave me didnt work).. but he couldnt even tell me the thread pitch

[ethangsmith]

Interesting. From the pictures I have seen of the Weber jets, they look identical. I have read a few places that they are the same as well. I may buy a jet kit and see if they fit. If they don't I can always sell them. I don't see why they wouldn't work. Everything else internally is the same. If they are different for some reason, I would love to know what they are!

[jrchevy87]

yeah everything else interchanges ive been trying to find the thread pitch of the stock jet and the weber jet and if they're the same then weber lied lol... the worst part is tho im really strapped for cash so i cant afford the 10 bucks for new jets that might not work

[ethangsmith]

Yea, replacement jets aren't cheap. That's one thing that has been preventing me from buying them.

[ethangsmith]

One thing I DO know is that the air corrector jets and idle jets are identical to the Weber stuff. I don't see why the main jets would be different.

[jrchevy87]

i just took the jet i have to autozone and its an m5-.8 but i still havent had any luck on finding out what the weber jet was so im prolly gonna just order it anyway and find out... o and if ur looking for a good baseline tune i can give you webers stock tune for the 2.3 which is a lot different then whats in my carb but mines also set up for emissions so once i get the money im gonna try to retune it to weber specs

[jrchevy87]

well i just ordered a jet and ill let you know if it fits when i get it

[ethangsmith]

Good deal. Let me know how it works! If it does, I will be ordering some jets soon too. Keep in mind that what Ford had stamped on the jets is not the same measuring system that Weber uses. A 145 Weber jet is 1.45mm. The jets I have pulled out of my carb (and some beat spares I have) are all in the 200's. I did find an old aquastat type Weber off a 1974 2.8L Mustang II and the jets in it were marked in the Weber numbering system. I have a 140 out of that that is about equivalent to a 239 in Ford's numbering system. I thought maybe Ford would be using inch measurements, but the conversion does not work. I will probably do the exact same route you do, just convert it to Weber specs and work from there.

[jrchevy87]

mine had weber style numbering... my primary is a 132 but i looked up what weber puts stock in the secondaries and its a 140 so i ordered that the primary is a 135 but whoever tuned my carb is wierd my primary air jet is a 195 when its supposed to be a 170 and my secondary is a 170 when its supposed to be a 160 and my idle jets are 50 and 70 when theyre supposed to be 50 and 60... so when i get the money im gonna retune to weber specs and rejet as needed... o and i asked the guy i bought the jets off of and he said it was the same thread... so i should know in about 5 days

[ethangsmith]

I'm not sure what's up with my jets. My 2 77 Pinto carbs and my 80,81,and 82 carbs all have jets in the 200's, and all are smaller than the 140 and 160 that I pulled out of the 74 Mustang 2. Go figure. The 140 and 160 jets thread perfectly into all the other carbs, so I am still going to say the Weber jets will work well for you. I didn't have anything to do today, so I spent most of the day in the garage trying to figure out what numbering system the 200 jets were. Still no luck on that. The only thing I can figure is that Ford had their own measuring system so people wouldn't play with the jets.

[jrchevy87]

do a google book search on Weber Carburetors and itll tell u the configuration for the dfev carbs and it says it'll work well on any engine if the venturi size is right... and a tip for more power on the top end without losing your mileage is to open the secondary venturi up a cpl thousandths of an inch.. a few ppl have told me it makes quite a difference

[ethangsmith]

You perchance wouldn't have the websites where you found that information would you? I've done quite a bit of searching but haven't come up with much. Oh, something I thought of last night was that if you rejet to a more rich mix, you'll probably have to change the choke setting or it will load up and stall when you start it. I have an old Ford manual that tells you how to set each adjustment on those carbs, so if you run into any trouble, I can take a picture of the page with my digital camera and send it to you. So many people make fun of me for using the 5200 and not a Holley, but the fact is, pretty much everything is adjustable on the 5200 so you can custom tailor it to your setup, even moreso than the Holley. And, it's a factory carb so it bolts right on without modification.

[ethangsmith]

I had some more time to burn today so I finally changed the air corrector jets in my carb. What a difference!!! My 77 Pinto carb I'm using had a 185 and a 195 in it. I changed them down to a 180 and 185 from parts carbs I have and even that small of a change in sizes made a big, big difference. No more ping at WOT and it pulls pretty good throughout the whole driving range. I will probably bump them to 175 and 180 eventually but I want to drive it a bit and make sure it's ok first.