Date: Sat, 11 Oct 1997 15:14:39 -0700
From: Joe Curry <curry@wolfenet.com>
Organization: Curry Enterprises
To: Odd Hedberg <odd@triumphclub.se>
Subject: Re: Heads (no vanity content)
References: <yam7223.232.120868592@mailhost.denver.infi.net>
<343FEB49.73FA@triumphclub.se>
Content-Transfer-Encoding: 8bit
Odd Hedberg wrote:
>
> Mark,
> I'll support Your try to get a decent, and technical, thread going...
> And cylinder heads is a nice and technical thread to start on this
> forum I think.
>
> As far as I know, on Spitfire/Herald heads:
>
> One can distinguish two different heads used on the standard SC-
> (SC = Small Car) engines (and three rare types used on racing engines)
> during the time between circa 1962 and 1980. They have been seen in
> many different applications with different valve sizes and compression
> ratio related measurements on head thickness and combustion chamber
> volume.
>
> The original head on the 1147cc engine in Herald 1200, 12/50 and in
> Spitfire Mk1 and Mk2 had two inlet ports, four exhaust ports, eleven
> head studs, a brass pipe fitted into the head as "cooling water
> distributor" and exposed pipes for the push rods to pass through.
>
> This head was supplemented by the rare types, all for 1147cc engines:
> The three types of eight port heads used in racing, rallying and
> tuning of the 1147cc engine.
>
> The one most commonly seen is the so called "Stage II head" with its
> spark plugs leaving the head at 90 degree angle to the longitudinal
> line of the head. This head was cast in iron and sold as an accessory
> to people and organisations wanting to tune the 1147cc engine.
> To be able to accomodate the extra intake ports they cut two of the
> head studs short, about 3/4 in, and put the nuts on them in two small
> niches grafted into the head, below the intake ports! How genuinely
> British! They are rare but not extinct. I've seen at least three, all
> at the same time...
>
> The other types are rare. No, make that VERY rare!
> These heads are the two types made for the factory racing/rallying
> effort in the mid sixties. They are most easily distinguished by the
> fact the spark plugs exit the head at another angle to the longitudi-
> nal line of the head. They were cast in both iron and aluminium alloy.
> The alloy heads were used on the rally cars and the iron ones on the
> racing cars. Not much in common with the Stage II heads, exept the fact
> the factory homologated them via the declared sale of enough
> numbers of Stage II heads. Probably a slight exaggeration... ;-)
> They are extremely rare. I've never seen any of them. If anyone have
> one for sale, call me!!! Collect call from Brisbane, Bolivia, what
> ever... I'll accept it!
>
> Then there is the so called later head, used on the Herald 13/60,
> the Spitfire Mk3, MkIV and 1500. (And on lots of other cars that
> Triumph blessed with the 1296cc/1493cc engines.) They had four intake
> and four exhaust ports, 10 head studs. It had no separate water
> distributor as it, and the pushrod tubes, were integral in the casting.
> It was delivered with different valve diameters along the years as
> well as compression ratios and exit holes for the heater feed, but
> it was essentially the same head all the time.
>
> I've probably forgotten something so if someone have more details to
> add to this, please feel free to jump in. I'd love to read them!
> I probably just scratched the surface of knowledge about the SC-type
> cylinder heads. For instance I'm not that knowledgeble on the 803cc
> and 948cc versions of SC-engine and would love to learn more on this.
>
> Now it's someone elses turn to tell us the different types of heads
> used on the six cylinder engines and on the four cylinder wet liners...
> And why not - on the poor Acclaim... ;-)
>
> /Odd
>
> Mark Stahlke wrote:
> > My 71 TR6 (CC61289L) has engine number CF18842UE. My limited
> > reference material indicates this is a 74 engine. The car is
> > fitted with a single pipe exhaust system as appropriate for a
> > 71 model.
> >
> > I seem to recall someone mentioning that port locations were
> > different on later engines. Or was that Spit heads (carefull
> > how you spell that!)?
> >
> > What are the differences in the heads on various model years?
> >
> > Is there any way to tell what head is on the engine without
> > disassembling it?
> >
> > There are several sets of numbers on the right side on the head.
> > Some are cast in, others are stamped. Any clue as to what they
> > mean?
> >
> > Thanks for your help,
> > Mark Stahlke
> > (desperately trying to start some new, more interesting threads)
>
> --
> Odd Hedberg
> Pomonagatan 4
> S-74236 Östhammar International liaison secretary,
> Sweden Triumph Club of Sweden
> '70 Spitfire Mk3 FD82497LO Signal Red
> E-mail: odd@triumphclub.se / odd.hedberg@bigfoot.com
> Club URL: http://www2.passagen.se/triumph/
> Home Telephone: Int+ 46-1731 7131
> Geographical Position: N 60deg15min E 18deg23min
> ------------------------------------------------------------
Odd,
How in the world do you expect to get a thread going if you say in one
EMAIL all there is to say on the subject. And you just about said it
all.
I guess we will have to get back to dictors or the like.
OH, BTW, Heard on the street recently, "No, I didn' say he was a
proctologist, I merely stated that he is an Ass Hole Doctor."
Regards,
Joe Curry '63 Spit
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