Fiat TC head with casting no 5991740

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marcin_FSO
Posts: 2
Joined: February 23rd, 2009, 3:08 pm
Location: Poland

Fiat TC head with casting no 5991740

Post by marcin_FSO »

Hi Guy. I just had good offer and bought second head for my 2.0 TC. The head number is 5991740 and it's hard to find info about this one. Probably is came from IE Argenta, but friend of mine find this engine in FSO Polonez and this one works with carb. Cen You tell me something more about this one??
MinorTC
Posts: 83
Joined: April 28th, 2009, 9:30 pm

Re: Fiat TC head with casting no 5991740

Post by MinorTC »

Hi,
My 2.0 litre Fiat twin cam also has a 5991740 head (I'm in the UK). The previous owner told me it is from a Fiat 131; indeed, on the machined flat with the engine number is the code "131^24^000", although the block casting also has "132DB2A0". The inlet manifold has "131 2A".
Maurice,
East Kent.
marcin_FSO
Posts: 2
Joined: February 23rd, 2009, 3:08 pm
Location: Poland

Re: Fiat TC head with casting no 5991740

Post by marcin_FSO »

Thanks for reply! I don't have block and don't know the number.

Good news is (I think) that it has 43.5mm intake valve. This mean this head is more similar to 105/130TC head and better then standard 2.0 head??
They say also about "no emissions port across the front of the head". I don't know that is good or bad for me.

Sorry if my questions are basic, but I just start tu build my first racing car and start to discover Fiat TC world.

marcin(Poland)
MinorTC
Posts: 83
Joined: April 28th, 2009, 9:30 pm

Re: Fiat TC head with casting no 5991740

Post by MinorTC »

I found this snippet on another Fiat site:
casting number : 5991740 has 42,4 mm valves - looks like 124 spider, but again the casting number number looks too high for this size valve which was last OE installed in 1977 in 1992 cc engines
Maurice,
East Kent.
Guy Croft
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Re: Fiat TC head with casting no 5991740

Post by Guy Croft »

I've always wanted to say this but never got around to it.

The patterns used for TC heads (certainly insofar as the 80 and 84mm bore non reversed port units are concerned) are more-or less identical, which is by way of saying the heads are more_or_less identical too.

We're talking about a very, very long list of TC units whose production ran to millions.

1438 (Fiat 124 Spider, Special T, Coupe)
1608 (124 Spider, Coupe, Samantha, 125)
1592, 1585, 1756, 2 liter nominal valve sizes 42/36mm (Fiat 124 Coupe/Spider 1600, 1800 131, 132, Argenta, Lancia Beta derivatives incl Coupe, Saloon, Spider, Montecarlo)
1585, 2 liter nominal valve sizes 43.5/36 (Fiat 105TC, 130TC Strada - and of course Ritmo 125TC - Lancia Volumex, Delta 1600 carb and turbo/carb version)

There is a reason for this. Hardwood patterns are fanastically expensive to make and if your prodn is so vast the change-over cost (design, production, tooling, inspection, integration, marketing, homologation etc etc) is absolutely massive. Now the way heads are made, it is a relatively simple exercise to employ different shaped cores for ports and combustion chamber to alter key characteristics model to model. For example the 105TC has significantly smaller inlet ports than its 2 liter cousin and quite right too. If enough cast thickness exists it is also a straighforward exercise to alter the size of the inlet valve insert and produce heads, as we know, with 43.5mm inlet valves instead of 42mm. Straighforward, sure, but for a volume manufacturer, still hugely costly. No-one who has never worked in a manufaturing plant should ever assume these things can be done either quickly - or at low cost, the changeover costs are staggeringly high.


To be continued..

GC
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