I have a 79 2000 with the dreaded 28/32 adha.
I want to replace the carb with a better performing one. I'm on a limitied budget, so could someone advise me on a good performing replacement and what I'm looking at cost wise?
Also, I have an extra intake manifold on a shelf in the garage that looks to be the single plane type, but I'm just a weekend mechanic and I'm really not sure what I'm looking at. Can someone help me with how to identify the single plane manifold and is there a way (maybe a number stamped on it) to tell what year of Spider it is from?
Thanks for all the help,
jb
Intake manifold identification
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barnesjtsl
- Posts: 203
- Joined: Fri Apr 03, 2009 2:13 pm
- Your car is a: 1979 Spider
- Location: Hillsboro, OR
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narfire
- Posts: 3959
- Joined: Sat Dec 27, 2008 2:14 am
- Your car is a: 1980 124 spider
- Location: Naramata B.C.
Re: Intake manifold identification
I don't have a pic handy, but a single plane is just that if you can compare it to your existing manifold. Single has a single large opening for the carb and all the air/fuel runners go straight to the head. Mine also has a coolant tab on the firewall side.
As for carbs.. seems the best budget bet is the 32/36 webber. The 34 ADF evidently works well but around $500.00 is pricey
As for carbs.. seems the best budget bet is the 32/36 webber. The 34 ADF evidently works well but around $500.00 is pricey
80 FI spider
72 work in progress
2017 Golf R ( APR Stg. 1)
2018 F350 crew long box
72 work in progress
2017 Golf R ( APR Stg. 1)
2018 F350 crew long box
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WYSpider
Re: Intake manifold identification
A Weber 32/36 DFEV did wonders for mine even using a dual plane manifold. $270 at Weber carbs direct.
http://www.webercarbsdirect.com/32_36_D ... 80.210.htm
http://www.webercarbsdirect.com/32_36_D ... 80.210.htm
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bradartigue
- Posts: 2183
- Joined: Thu Sep 20, 2007 2:35 pm
- Your car is a: 1970 Sport Spider
- Location: Atlanta, GA
Re: Intake manifold identification
I quote myself from the fabulous book "FIAT 124 Spider Engine Maintenance and Modification" available here: http://www.artigue.com/?page_id=616 at a cost to you of $0.00.
FIAT used two types of intake manifolds on carbureted engines. The type of manifold was relative to the type of carburetor. Carburetors fitted with a vacuum operated secondary barrel (those with an “H” in the name) were fitted with a manifold with different sets of upper and lower runners. These can be identified by removing the carburetor and noting that the two barrels have their own plenums, instead of one large opening underneath the carburetor base. When using the vacuum type carburetors it is important to have the dual planes for proper opening of the secondary barrel; when using the non-vacuum carburetors the split planes will impede performance. Therefore it is important to have the correct manifold for your carburetor and, if you are planning a swap to another carburetor, that you are also planning for a manifold swap.
All that being said, there are few viable options for the budget minded FIAT person these days. In decreasing order of expense:
1) Single plane manifold from a Spider 1800 and the Weber 34ADF. Lots and lots of power. Transforms the Spider 2000 from a soggy old grandma machine into a nice fast car that can even spin the tires. Retains the water choke and +12V solenoid and (on most of them) already has the vacuum porting for the distributor. About as plug and play as you can get.
2) Single plane manifold from a Spider 1800 and the Weber 32ADFA. Nice improvement over the ADHA. Retains the water choke and +12V solenoid and (on most of them) already has the vacuum porting for the distributor. Also about as plug and play as you can get.
3) Single plane manifold from a Spider 1800 and the Weber 32/36 DFEV. Takes a little more time to get set up due to the generic throttle assembly and the electric choke but it is a nice, powerful little carb. A little more fuel minded than the 34ADF but has a nice big secondary for when you really open it up. Most DFEVs I've bought have porting for the distributor already.
4) Your existing manifold and a used but good 32ADFA. Likely needs a pretty big spacer to accommodate for the lousy manifold openings (last time I did this we used a 3/4" aluminum spacer). It isn't bad but it is better than the ADHA.
FIAT used two types of intake manifolds on carbureted engines. The type of manifold was relative to the type of carburetor. Carburetors fitted with a vacuum operated secondary barrel (those with an “H” in the name) were fitted with a manifold with different sets of upper and lower runners. These can be identified by removing the carburetor and noting that the two barrels have their own plenums, instead of one large opening underneath the carburetor base. When using the vacuum type carburetors it is important to have the dual planes for proper opening of the secondary barrel; when using the non-vacuum carburetors the split planes will impede performance. Therefore it is important to have the correct manifold for your carburetor and, if you are planning a swap to another carburetor, that you are also planning for a manifold swap.
All that being said, there are few viable options for the budget minded FIAT person these days. In decreasing order of expense:
1) Single plane manifold from a Spider 1800 and the Weber 34ADF. Lots and lots of power. Transforms the Spider 2000 from a soggy old grandma machine into a nice fast car that can even spin the tires. Retains the water choke and +12V solenoid and (on most of them) already has the vacuum porting for the distributor. About as plug and play as you can get.
2) Single plane manifold from a Spider 1800 and the Weber 32ADFA. Nice improvement over the ADHA. Retains the water choke and +12V solenoid and (on most of them) already has the vacuum porting for the distributor. Also about as plug and play as you can get.
3) Single plane manifold from a Spider 1800 and the Weber 32/36 DFEV. Takes a little more time to get set up due to the generic throttle assembly and the electric choke but it is a nice, powerful little carb. A little more fuel minded than the 34ADF but has a nice big secondary for when you really open it up. Most DFEVs I've bought have porting for the distributor already.
4) Your existing manifold and a used but good 32ADFA. Likely needs a pretty big spacer to accommodate for the lousy manifold openings (last time I did this we used a 3/4" aluminum spacer). It isn't bad but it is better than the ADHA.
1970 124 Spider
http://www.artigue.com/fiat
http://www.artigue.com/fiat
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geert
- Posts: 107
- Joined: Sun Dec 20, 2009 11:41 am
- Your car is a: 1977 1800spider
- Location: Bruges, Belgium
Re: Intake manifold identification
hello,
the discription of the single plane manifold in the other answers is correct, if you would know from what engine it came might be useful also ( spider-year, fiat 131/ 132 ) You can compare it with your original manifold, hopefully it"s not the same. ( maybe send a picture ?)
simple improvement would be the weber 32 ADF ( or similar solex 32 c), I am told the weber 34ADf would be better.
Don't forget the exhaust also ( 4-2-1)
There is a topic about it on the mirafiori website.
succes, en groeten, Geert.
the discription of the single plane manifold in the other answers is correct, if you would know from what engine it came might be useful also ( spider-year, fiat 131/ 132 ) You can compare it with your original manifold, hopefully it"s not the same. ( maybe send a picture ?)
simple improvement would be the weber 32 ADF ( or similar solex 32 c), I am told the weber 34ADf would be better.
Don't forget the exhaust also ( 4-2-1)
There is a topic about it on the mirafiori website.
succes, en groeten, Geert.
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jctucker
Re: Intake manifold identification
There's someone locally parting out a '75 Spider that runs well, so they say.
I, too have a '79 Spider 2000 with the ADHA carb and would like to upgrade. What's a fair price to get an 1800 intake/32 ADFA setup for?
Jason
I, too have a '79 Spider 2000 with the ADHA carb and would like to upgrade. What's a fair price to get an 1800 intake/32 ADFA setup for?
Jason