Best Carb Options for a desmog.... chime in

[jfnall]

Go with a JimC rebuild and recurved dizzy...... or go with another carb Weber, etc???

getting closer on my rebuild. considering carb options. I have looked at tons of posts and it seems an OEM carb rebuilt by Jim is the preferred option. Just wanted some confirmation and to see all the differing options in one thread.

I want to keep my factory air box since it is customized for my snorkel setup. My only question with going a different route other than the OEM jimC rebuild is simplicity under the hood. looks like a weber (or others) have fewer hose complications to deal with.

Will the rebuilt carb give me a longer carb life than a weber?

if i go with a weber, how is the high altitude problem dealt with?

will the recurved dizzy i have work correctly with any carb? or is it made to match a specific carb. (not sure what "recurved" means and what is fixed or changed)


(Matt and Trollhole - i'm not discounting your previous replies, i just wanted to see posts from several folks in one thread.)

hopefully will get some pics up soon.

Jeff

 

[FJ40Jim]

What qualities define "best"?

 

[lehiguy]

I had very good luck with a Weber, I ran it for years at an average elevation of 5000 feet. They are easy to tune and they are incredibly consistent, not "moody" like some other carbs I have had the misfortune of running. One drawback is the price of admission. Man-A-Fre sells a kit with a throttle linkage adapter so you don't have to fabricate a throttle cable. Downey claims to have perfected the Holley setup, but that is the very carb that gave me the most trouble and was the most particular about inclines, hot and cold, etc. Posters swear by the Jim C rebuild too and I think you can desmog that. Or you could do the inevitable and just put in an injected Chevy.

 

[kbill45]

Carb

I am running 38mm Webers on my 40 and 60 and the give incredible performance. Conversion kit # 745 is the correct application. Comes with everthing needed requires minor modification for around $380 from a Redline distributer. MAF sell a different kit that is a direct connect but it is quite pricey.

The air flow didn't seem adaquate so I made an adapter from 3" black sewer pipe and used the Toy air breather. Works great.

 

[lehiguy]

I am running 38mm Webers on my 40 and 60 and the give incredible performance. Conversion kit # 745 is the correct application. Comes with everthing needed requires minor modification for around $380 from a Redline distributer. MAF sell a different kit that is a direct connect but it is quite pricey.

The air flow didn't seem adaquate so I made an adapter from 3" black sewer pipe and used the Toy air breather. Works great.

You're right, I took off the dumb, squarish air cleaneer that comes with those kits and the thing ran better all the way around. K&N sells an adapter that allows a standard sized, round air cleaner to be installed. As I recall, I used a 10" chrome thing with a K&N element and it ran much, much better.

 

[Downey]

A couple of things:
(a) Jfnal (Jeff), you said you have a recurved dizzy. What was done? hopefully they added more mechanical advance ( 32 degrees being a very good number).
(b) Lehiguy, you said you had trouble with a Holley on hillsides. That is exactly where anybody will have trouble with an unbaffled Holley, and the dirty rotten shame is that it is so cheap and easy to baffle the float bowl.

 

[Grady]

Put me down for weber 38
tried stock (not jim C'd) and weber 32/36
Now I have more power and no stalling

 

[smkymntn]

Jimc for mine and runs like a new truck- even in 20 degree weather cranks with 2 pumps of the gas with no choke. I am at about 2700ft and have gone up to 6200ft with no loss of power.

 

[jfnall]

first, i am honored that Jim would be the first reply after i posted the thread.

I have your (JimC carb and recurved dizzy) sitting and waiting its turn to get mounted. The guy helping me with this whole process has rebuilt lots of motors, but never done a spaghetti-lined Toyota. He is pushing my towards a weber to simplify things, being unfamiliar with the vac system and extra stuff these have. (this is getting desmogged)

As far as "best" -- looking for trouble free long-term use. I don't want to have to fool with some adjustments or re-tune or fix leaking gaskets, etc for a long while. to me that is best. mileage and power is not a concern. reliability is the most important. I guess that is what "best" would be.

 

[Heartworm]

The Jim C carb is simple

I have had 3 Jim C desmogged carbs and once you become enlightened, it is so simple Forrest Gump can install them. Jim will help you with the desmog, not all hoses going to the carb should be eliminated if you want such amenities as AC idle up, distributor advance, Fuel evaporation, Fuel bowl overflow. You also keep your stock Toyota air cleaner which has a mechanism for heating the intake air for cold starts and you keep the air flow mechanism through the distibutor which keeps the dizzy dry. I do not have a clue how the other card get all this done. The fabrication work associated with a desmog on a 2F is not associated with a Jim C Aisin carb. It is the intake and exhaust manifolds and dealing with keeping the air pump pulley (or an idler pulley) so that your water pump will still be driven. Also, plugging the holes in the engine head when you remove the air rail and capping off some holes in the stock 2F air cleaner.
The bottom line is the carb from Jim C. is the same 4 bolts on the intake manifold, the same fuel line, the same linkage for accellerator and choke, the same wire for fuel cut solenoid, the same hose for AC idle up, and 3 little vacuum hoses for the distributor advance and EVAP system. Jim C. carbs on otherwise tuned FJ60s get a steady 14.5-17 mpg. They handle inclines just fine.

 

[FJ40Jim]

Best is whatever works best for you and your mechanic.

Sounds like a weber might be a better choice for the mechanic's skill level.

 

[FJ40Jim]

Jfnal, you said you have a recurved dizzy. What was done? hopefully they added more mechanical advance ( 32 degrees being a very good number).

32* mech plus 20* vac plus 7* base would give 59 deg total timing.

Maybe 32* total timing? Not just 32* mech advance?

 

[GLTHFJ60]

Best carb for a desmog in my mind would either be a non-USA 2f or 3f carb. No ports for the emission systems and it's still a toyota part.

 

[fj60dave]

did my own desmog...reading the FSM, this forum, trial and error...plus JimC carb rebuild + distributor. Stick with yoda carb and Jim will make it better than new. and if you are in a place that allows the desmog, lose the excess baggage.