New to group: Carb conversion advice

[bsbronco73]

I have a 73 EB with stock 200 I6. Has YF 1v carb. Looking to upgrade to Weber 32/36 using adaptor. What other options are out there?

EB sat for 20+ years. Rebuilt carb but needs to be replaced and I want a little more drivability. When I took carb apart float was rusted to bowel. Runs ok now but more than half throttle it just dies. I have replaced main fuel tank, all lines and filters, and mech pump.

Thanks for the advice.

 

[rbohm]

i would go with a direct mount 38 weber instead of the progressive 32/36. that or a 2100 autolite, also direct mounted.

 

[bmbm40]

I think the YF was used on the 300 which may have more cfm than the one you have so that may be an option. I don't know how you use your Bronco but having the second barrel kick in might be problematic under certain conditions. As rbohm stated direct mount gives best results typically.
If you happen upon a 250 in good condition it is a fairly easy swap into a Bronco and increases drivability a lot. The 250 has more torque at low rpm and throughout the rpm range that I drive mine in and it had a good running 200 before.

 

[CZLN6]

Howdy Bsbronco:

And welcome to The Forum. here's an FYI on the various Carter YF carbs for comparison;

Cfm ratings for Carter YF/YFA carbs by engine sizes.
1.) 170 ci carb was rated at 150 CFM.
2.) 200 ci carb was rated at 187 CFM.
3.) 240 & 250 ci carb was rated at 193 CFM (1975-1979).
4.) 250 ci with RBS was rated at 215 CFM (1970- 1974
4.) 300 ci carb was rated at 220 CFM.

A higher cfm rated carb may not be the answer for a low rpm torquer like a Bronco. More cfm typically help the higher rpm range. A Weber through an adaptor won't give you all the potential of that carb. It may clean up drivability some.

What distributor are you using? What is the initial advance setting? The carb's symptoms sound like a fuel delivery problem. Given what you've already replaced or repaired, I'd be looking over the carb again. That's my two cents, for what it's worth.

Adios, David

 

[powerband]

I have a 73 EB with stock 200 I6. Has YF 1v carb. Looking to upgrade to Weber 32/36 using adaptor. What other options are out there?

EB?., is that Aussie?...
> The OEM carb on my '71 Mav 170 was the YF - good daily runner , consistent idle , not leaky ,. 170 now uses a 32/36 -H/W5200 type progressive thru a typical 2Bbl adapter with a souped up cylinder head running close to 10:1 CR. Consistent idle, smooth off-idle cruise , peppy performance, decent MPG (at 93 octane) for my daily driver '63 wagon.





have fun

 

[bsbronco73]

Thanks for the advice. I think I'll stay with a YF and just get a new carb due to this one being worn out. I plan to upgrade distributor and ignition system.

The Bronco has been in the family since new. All original, no rust and has 42k on odometer. Plans are just to drive around town, no serious off roading. Would like to keep it as stock as possible, but upgrade reliability. In the future I'll rebuild the motor and consider a 250 at that time.

Any good leads on places to purchase new or rebuilt carbs? Thanks again

 

[bmbm40]

That sounds like a very nice Bronco, they are seldom rust free and low mileage. I would keep it mostly stock also and just cruising around town the 200 is good. I don't know where you can get a new YF although the guy I bought my 250 from claimed it had a new carb(YF) on it and it did look new to me. It runs perfectly, good drivability and starts right up. For a used one Ebay might be a good place to look or classicbroncos.com as their members often pull the sixes for v8s. Wrecking yards might be a place to look I find good stuff at picnpull. I bought a rebuilt YF for my f150 at Napa several years ago and it has been fine but have known people to have problems with store bought rebuilt carbs.
Part of the reason my Bronco runs well is the DSII ignition system that I bought used at picnpull half price day. For the dist, module, plug wires and misc was about $50 I think. There are members on here that can modify the advance curve of a DSII for you to get max performance it is capable of.
Get a copy of the Ford Falcon Performance Manual- it is a great resource for six cylinder performance info and is available at classicinlines.com.
Keep us posted.

 

[Econoline]

You can get new YF's. You can get a new or rebuilt YF from National Carburetors

 

[bsbronco73]

Thanks for the link econoline.

I took the carb off today to tinker with float, but still looking to order replacement.

 

[bsbronco73]

Got the carb back on and she runs great. Messed with float. I must have went back together with an improper float setting initially. Thanks again for the info.