Smog Port Plug Size

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TNfiat
Posts: 9
Joined: Tue Mar 14, 2017 6:57 am
Your car is a: 1978 Fiat 124 Spider

Smog Port Plug Size

Postby TNfiat » Mon Apr 03, 2017 11:11 pm

Does anyone know what size plugs I will need to buy to plug the smog ports shown in the pic below? I have a 78 Fiat Spider 1800 stock engine.

Thanks in advance for the help

Image
Ciao,
Norm
Franklin, TN

BwBrown
Posts: 84
Joined: Wed Apr 10, 2013 5:08 pm
Your car is a: 1970 Spider

Re: Smog Port Plug Size

Postby BwBrown » Tue Apr 04, 2017 12:33 am

One of the vendors on this site sells a set of four plugs for this purpose at a very reasonable price.
Can't remember which one, but I bought a set - and they fit.
Maybe they will weigh in.
Dushore, in Northeast PA
1970 124 Spider (red) and a 1979 2000 Spider (Ferrari yellow)
Also: a pair of 1952 MGTDs
1972 Fiat 850 Spider
1965 Chevelle SS Convertible
1975 Corvette
1986 Lada Niva

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So Cal Mark
Posts: 13839
Joined: Wed Jan 25, 2006 3:45 pm
Your car is a: Fiat
Location: upland, ca.

Re: Smog Port Plug Size

Postby So Cal Mark » Tue Apr 04, 2017 12:43 am

12x1.25
Mark Allison
allisonsautomotive.com Fiat and Alfa Romeo parts and service. Performance parts our specialty!
Headers, ignitions, wheels, cams, flywheels
starsmark@hotmail.com 909-981-3566

klweimer
Posts: 550
Joined: Tue Mar 27, 2012 7:45 am
Your car is a: 1982 Spider 2000
Location: Arvada, Colorado

Re: Smog Port Plug Size

Postby klweimer » Tue Apr 04, 2017 8:33 am

Pretty sure Autoricambi sells the set.

TNfiat
Posts: 9
Joined: Tue Mar 14, 2017 6:57 am
Your car is a: 1978 Fiat 124 Spider

Re: Smog Port Plug Size

Postby TNfiat » Tue Apr 04, 2017 11:51 am

BwBrown: thanks for the suggestion. I would like to support the members on this forum by purchasing from them so hopefully someone suggests a name that I can contact to get these plugs ordered.

Mark: thanks for your prompt reply with the sizes. That's a big help to locate some.

klweimer: thanks - are they part of this forum? I'm new here - see my intro that I posted yesterday.

thanks again everyone,
norm
Ciao,
Norm
Franklin, TN

AriK
Patron 2018
Patron 2018
Posts: 1148
Joined: Sat Apr 02, 2011 7:58 pm
Your car is a: 1979 Fiat Spider
Location: Montreal Canada

Re: Smog Port Plug Size

Postby AriK » Tue Apr 04, 2017 1:22 pm

Yes Norm, if you can't find them locally, i also suggest Auto Ricambi. Both Vandor and Ramzi are members here. They're not just counter people, they're true connoisseurs of the brand.

klweimer
Posts: 550
Joined: Tue Mar 27, 2012 7:45 am
Your car is a: 1982 Spider 2000
Location: Arvada, Colorado

Re: Smog Port Plug Size

Postby klweimer » Wed Apr 05, 2017 8:34 am

Hi Norm,

A few useful parts suppliers:

Autoricambi- http://www.autoricambi.us
Allison's Automotive - http://www.allisonsautomotive.com
Vick Autosport - http://www.vickauto.com
Midwest-Bayless - http://www.midwest-bayless.com

Autoricambi is my go to group for all the stock bits you need, as well as some performance pieces. Csaba and Ramzi are on this site a lot and very knowledgeable.

Allison's is all about performance and has good stuff too. Mark Allison is the forum moderator. Also very knowledgeable. I have a variety of performance items from Mark on my car.

People on the forum run hot and cold on Vick's. Some love them, some don't. I've had OK, but not great interactions with Vick's. YMMV

Midwest-Bayless is not discussed much on the forum, but I've had good luck with them also.

Kirk

samakijoe
Posts: 132
Joined: Wed Mar 15, 2017 9:56 pm
Your car is a: 1975 Fiat 124
Location: Original Washington (1776) NC

Re: Smog Port Plug Size

Postby samakijoe » Fri Apr 07, 2017 10:49 am

The size of the plug is 12mm x 1.25 mm.
I found some (set screws) at screw suppliers but they cost about $8 a piece. (not a big seller I guess)
I bought a bolt that size and planed to make plugs with a
dremel tool with a slot on top to install them with lock tight .
You could just cut the bolts you take out of the head to make the plugs.
Out of curiosity I ran the motor with one of the bolts out of the head.
Nothing come out of the open hole.
SAMAKIJOE
AKA GRANDPA GRUMPYPANTS

TNfiat
Posts: 9
Joined: Tue Mar 14, 2017 6:57 am
Your car is a: 1978 Fiat 124 Spider

Re: Smog Port Plug Size

Postby TNfiat » Fri Apr 07, 2017 3:05 pm

Arik: I have been in touch with Vandor on another item so glad to support the members.

klweimer: thanks again for the vendor list. The Bayless rings a bell from 29 yrs ago for parts back when my daughter was using it. In fact I still have one of their paper parts catalogs when you use to order by phone and they would ship the part, ie no online ordering back then.

samakijoe: that is an excellent idea - I did buy some bolts in case I can't find the plugs but they are too long. I may try your idea about creating a plug with a dremel. BTW I am not an expert on smog control systems but I suspect that the port may have been plugged so therefore nothing came out when you ran the engine.

Thanks again to everyone that responded.
Ciao,
Norm
Franklin, TN

vandor
Posts: 3996
Joined: Sat May 23, 2009 1:23 pm
Your car is a: 1971 124 Spider
Location: Texas, USA

Re: Smog Port Plug Size

Postby vandor » Sat Apr 08, 2017 12:27 am

Last edited by vandor on Thu Apr 13, 2017 2:16 am, edited 1 time in total.
Csaba
'71 124 Spider, much modified
'17 124 Abarth, silver
http://italiancarclub.com/csaba/
Co-owner of the best dang Fiat parts place in town

TNfiat
Posts: 9
Joined: Tue Mar 14, 2017 6:57 am
Your car is a: 1978 Fiat 124 Spider

Re: Smog Port Plug Size

Postby TNfiat » Wed Apr 12, 2017 8:37 pm

Ordered a set from Autoricambi - thanks Csaba
Ciao,
Norm
Franklin, TN

carl
Posts: 244
Joined: Mon Oct 06, 2008 9:56 am
Your car is a: 1971 128

Re: Smog Port Plug Size

Postby carl » Fri Apr 14, 2017 8:25 am

They are the same size as the Fiat wheel bolts. Back in the day I made grub screws for these ports by using my Dremel to cut short sections from spare wheel bolts (don't we all have a few hundred of them laying around) and then cutting a screw driver slot in the top.

Odd that running with one removed did not change anything, the port won't affect running since it's exhaust gas after the valve but it will make a hell of a racket since the entire exhaust system is bypassed.


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