strange carb set up. 1971 F100 AOD

BayStYAt · Post by **BayStYAt** » Tue Dec 18, 2018 8:23 pm

So I just realized I have a 2 barrel carb from a 390 on a 302. Could running this cause any issues? I am looking to just replace the carb all together with a 2100 for a 302. Seems to run rich.

thanks

basketcase0302 · Post by **basketcase0302** » Wed Dec 19, 2018 7:59 am

"BayStYAt"]So I just realized I have a 2 barrel carb from a 390 on a 302. Could running this cause any issues? I am looking to just replace the carb all together with a 2100 for a 302. Seems to run rich.

thanks

You'll get 10 different answers on this question.

I ran the Motorcraft 2150, (best carb ever made as far as I'm concerned) from my 360 for a few years on my "little 302" (as some folks here call them) with no issues. Yeah it'll run rich but just go get the rebuild kit for the Motorcraft 2150 302 that has the smaller jet in it and call it a day.
Simplest / most dependable;e / easy to rebuild carb to date.

Post by **Ranchero50** » Wed Dec 19, 2018 8:45 am

It won't run rich because the carb is designed to flow the correct amount of fuel for the CFM it's capable of. You just have a carb capable of flowing a larger amount of air. I run a 390 2100 on my 289 and it runs fine. Exhaust smells clean.

BayStYAt · Post by **BayStYAt** » Wed Dec 19, 2018 5:18 pm

Thanks, It seems to have a lot of oil around the base and dripping onto the intake. What will cause oil to come from the carb?

BayStYAt · Post by **BayStYAt** » Wed Dec 19, 2018 5:32 pm

basketcase0302 wrote:
"BayStYAt"]So I just realized I have a 2 barrel carb from a 390 on a 302. Could running this cause any issues? I am looking to just replace the carb all together with a 2100 for a 302. Seems to run rich.

thanks
You'll get 10 different answers on this question.
I ran the Motorcraft 2150, (best carb ever made as far as I'm concerned) from my 360 for a few years on my "little 302" (as some folks here call them) with no issues. Yeah it'll run rich but just go get the rebuild kit for the Motorcraft 2150 302 that has the smaller jet in it and call it a day.
Simplest / most dependable;e / easy to rebuild carb to date.

How do I identify my carb? I can't find a model number.

the choke looks like jaws got a hold of it and the choke pull off is broken off completely. I only have 3 vacuum lines connected.

Post by **DuckRyder** » Wed Dec 19, 2018 6:53 pm

It is supposed to have a metal tag on one of the bowl screws.

Look on the sides for something like 1.08 or 1.12...

AOD? As in Automatic OverDrive transmission?

BayStYAt · Post by **BayStYAt** » Wed Dec 19, 2018 6:57 pm

DuckRyder wrote:It is supposed to have a metal tag on one of the bowl screws.

Look on the sides for something like 1.08 or 1.12...

AOD? As in Automatic OverDrive transmission?

sorry no overdrive. Just Automatic

Post by **Ranchero50** » Thu Dec 20, 2018 8:16 am

Looks like a mid 70's emissions carb

BayStYAt · Post by **BayStYAt** » Thu Dec 20, 2018 8:18 am

Ranchero50 wrote:Looks like a mid 70's emissions carb

crap! really...... Can an emissions carb cause running issues?

I am gonna replace it.

Post by **Ranchero50** » Thu Dec 20, 2018 12:04 pm

Not having the vacuum advance hooked up on the distributor will. What does the rest of the engine look like?

BayStYAt · Post by **BayStYAt** » Thu Dec 20, 2018 12:28 pm

Ranchero50 wrote:Not having the vacuum advance hooked up on the distributor will. What does the rest of the engine look like?

I have a Mallary Unilite Distributor. No vacuum advance on it. What to look for as for as rest of the engine?

BayStYAt · Post by **BayStYAt** » Fri Dec 21, 2018 10:31 am

what causes all the oil to build up around the carb ?

Post by **Ranchero50** » Fri Dec 21, 2018 11:32 am

If I had to venture a guess I'd say a sick engine. Excessive blowby will work it's way up the fresh air intake for the PCV and foul that area. Of course a non working PCV system will too.

Pics of everything will help identify problem areas. No vacuum advance will limit drivability causing sluggish performance. Timing doesn't follow the load on the engine, only the RPM.

BayStYAt · Post by **BayStYAt** » Fri Dec 21, 2018 12:12 pm

Ranchero50 wrote:If I had to venture a guess I'd say a sick engine. Excessive blowby will work it's way up the fresh air intake for the PCV and foul that area. Of course a non working PCV system will too.

Pics of everything will help identify problem areas. No vacuum advance will limit drivability causing sluggish performance. Timing doesn't follow the load on the engine, only the RPM.

Ok,I will get some pics. Is the non vacuum advance Mallory distributor causing an issue?

BayStYAt · Post by **BayStYAt** » Fri Dec 21, 2018 7:12 pm

Will a 2150 carb work on a engine that is 2100 carb pre smog with out electric choke?

The only replacement I can find is the 2150 at a good price.

thanks

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strange carb set up. 1971 F100 AOD

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