What Carb for my 200?

[Anonymous]

Just replaced the 170 in my 70 Bronco with a 200 that I refreshed with rings, bearings, timing, and oil set. Everything went great, and the engine runs,, but.... the carb was running extremely rich on my 170 (black smoke at idle, flooding and missing at full throttle), and had a very lopey idle, and continues to do so on the 200(which didnt have a carb when I bought it) Its the original Carter YF and Im wanting something more tunable (I live in Colorado at 8000ft altitude) and of course more power wont hurt any. Problem is I (my wife) want to keep it cheap,, as in the $150 range. I can buy a Holley 1101 from Autozone for about that. is it worth it,, or is there a better way to do it,, junkyard maybe. if so what vehicle whould I be looking at ? Also, what about going with a 2V and an adaptor. Any help would be appreciated. Also while Im here, is the Pertronix ignition a good upgrade? what results can I expect from it?

Ken

 

[Anonymous]

I am personally finishing the 2v upgrade myself. Do a search for stovebolt and see what you can come up with. I think you will like the results.

 

[CZLN6]

Howdy Ken:

Your problem is 8,000 ft of elevation. Is your original YF off of a 170? If it is you're giving up power. The 170 YFs flowed 150cfm as compared to 185 cfm on a 200 YF. Have you considered a YF off a 200? Given your location, you need more air and less gas for a correct A/F ratio.

It sounds like your stock YF needs a rebuild and kit. The rebuild kits for YFs are cheap and these carbs are fairly easy to rebuild. You might consider rebuilding your YF for a better running rig while your shopping and considering your options.

The 1101 is a good option for a stock looking, bolt on upgrade. Does your Bronco have a throttle cable or linkage? Unfortunately, Autolite jets are scarce and at 8,000 ft. you'll need to reduce the size of the main jet regardless of which carb you use. You will also be limited with tuneability of the idle circuitry on most carbs. All of your common choices use a channel restriction in the idle circuitry. The low speed air screw offer some tuneability, but sometimes, not enough.

All things considered, A Holley 2300 in a 350 CFM capacity might be best for you. It is very tuneable, and hood clearance, with an adaptor, should not be a problem in your Bronco.

Adios, David