Stock FIAT Exhaust Differences

[opus10583]

Can anyone provide the measurements to complete the following tables?

Manifold...........Cyl port ID........Downtube port ID
FIAT 4151276

FIAT 4166429

FIAT 4308891


Downpipe.........Man flange tube ID........Outlet tube ID........Outlet tube OD

VAS 27-2316

VAS 27-2317

IAP 63416

FIAT 4310530


Thanks,
Mark

[grittracing]

what year spider and what size engine and if newer is it FI or turbo ?

[opus10583]

what year spider and what size engine and if newer is it FI or turbo ?

I want to replace the 4 into 1 'public washroom drain'-system on my 49-state 1978 1800 with a proper 4-2-1 system, and I'm trying to weed through contradictory or incomplete references to stock FIAT pieces and aftermarket replacements.

I don't think I want a tube header.

Thanks,
Mark

[minimike]

Mark,
I ran a tube header on my 1800 about 20+ years ago. It put out so much heat, it melted the rad overflow container.

If you use one, wrap it with the heat tape and make a heat shield with plain old roofing aluminum flashing to keep the heat from building up on the bottom side of the overflow storage container. It should not touch the header or the container.

[opus10583]

Mark,
I ran a tube header on my 1800 about 20+ years ago. It put out so much heat, it melted the rad overflow container.

If you use one, wrap it with the heat tape and make a heat shield with plain old roofing aluminum flashing to keep the heat from building up on the bottom side of the overflow storage container. It should not touch the header or the container.

Thanks for the tips!

I don't want a header. It's not the sound I'm looking for, and I hadn't even thought of the heat issues.

The stock FIAT 4-2-1 system is just fine for what I want, durable and inexpensive, even as parts become more scarce.

...It's solid information that has proved very dear, indeed.

[geert]

what year spider and what size engine and if newer is it FI or turbo ?

I want to replace the 4 into 1 'public washroom drain'-system on my 49-state 1978 1800 with a proper 4-2-1 system, and I'm trying to weed through contradictory or incomplete references to stock FIAT pieces and aftermarket replacements.

I don't think I want a tube header.

Thanks,
Mark

Hallo Marc,

don't understand exactly what you ask about measurements ,
but if you want to change the 4-1 and replace with a good fiat 4-2-1 I might help, because I did the same, for the same reasons.

Fiat manifold exhaust FIAT 4166429-4 ( from an 'European" 1600cc Fiat 132 ) fits perfectly on the FIAT 132AB9A 4277590 head ( .77 spider, california ). Downpipe : 2 pipes ( don't think there are many different types (?) ).

Perfect fit : first contact with the crossmember, and just before hitting the damm thing with a hammer I realised that putting new enginemounts might do the trick ( engine higher and more backwards), and it worked. (lesson : violence is never an answer (except for balljoints ) )

groeten, geert

[opus10583]

Hi Geert,

I asked for measurements because there is a lot of conflicting and contradictory information out there concerning 124 TC exhaust systems and components, so I was hoping to get a set of measurements to base a reasoned decision on.

I have chosen a route similar to that you have: 4151276-2, and the later 1592/1756 downpipe, which people who sell both tell me is the deeper of the two, to avoid a clearance problem. This will then plug in to one of the NOS Abarth systems you can find offered in the parts for sale section of this site. If nothing else it's a gorgeous piece of history, and this setup should sound like my dreams, once I twist the distributor a bit. Parts should be here about the time I get the car back from the metal guys, next week

Ciao,
Mark

Hallo Marc,

don't understand exactly what you ask about measurements ,
but if you want to change the 4-1 and replace with a good fiat 4-2-1 I might help, because I did the same, for the same reasons.

Fiat manifold exhaust FIAT 4166429-4 ( from an 'European" 1600cc Fiat 132 ) fits perfectly on the FIAT 132AB9A 4277590 head ( .77 spider, california ). Downpipe : 2 pipes ( don't think there are many different types (?) ).

groeten, geert