Hi Joe,
Yes I'm aware of the large Combustion Chambers on the 1500. I have the
Head here
at work. I would be C.C.ing the Combustion Chambers and figure on a C.R. at
the Deck
Height with .040" over AE Pistons. My biggest question was whether to use my
Cylinder
Head # 515573 Herald Small Valve Head which shares specs with the Mk3 and
probably came
off of it to start with. It will end up with the 1 7/16 Intakes and Ports
matched to Euro 1500
2 x HS4 Manifold and Carbs. Ultimately I'd like to end up with about 9.5:1
C.R. in either configuration.
Any opinions on what's the best Head to start with? I've got a couple
already.
Thanks,
Wayne
--------------------------------------------------
From: "Joe Curry" <spitlist@cox.net>
Sent: Friday, April 23, 2010 12:35 PM
To: <jimmuller@rcn.com>; <Triumphs@autox.team.net>
Subject: Re: [TR] Identifying Spitfire Cylinder head # TKC 2748( Now another
Head and Block)
> I can categorically say that if you use an unaltered 1500 head on a 1300
> engine, you will not be very satisfied with the performance. The reason
> is
> that the 1500 heads are about a quarter inch thicker than the 1300 heads
> and
> unless you cut it way down, the compression ratio will be so low that it
> will suffer.
>
> I have a large valve 1500 head on the Mk3 (1300) engine in my red Mk1
> Spit,
> Huxley. In order to achieve the desired compression ratio, I had to have
> about a quarter inch of metal shaved off the bottom.
>
> All you have to do to verify this is compare a stock 1500 head with any
> head
> off a 1300 engine.
>
> Regarding Unleaded heads, I doubt that Triumph did those prior to 1975
> since
> that was the first year Unleaded fuel was universally offered in the US
> and
> the first year the government mandated new cars use it.
>
> Joe
>
> -----Original Message-----
> From: triumphs-bounces@autox.team.net
> [mailto:triumphs-bounces@autox.team.net] On Behalf Of jimmuller@rcn.com
> Sent: Friday, April 23, 2010 8:49 AM
> To: Triumphs@autox.team.net
> Subject: Re: [TR] Identifying Spitfire Cylinder head # TKC 2748( Now
> another
> Head and Block)
>
>> Wayne, that block would be a circa 1972 Spitfire MkIV
>> "Federal" (hence the "U" in the suffix) engine, low
>> compression and recessed bores.
>
> I've rarely had occasion to think about such things (if it runs, you just
> run it) and I haven't followed this thread too closely (too much going on
> lately). But I recall being told that the 7.5:1 vs. 9.0:1 difference was
> strictly in the head.
>
> Yes, no?
> --
> Jim Muller
> Or maybe they really said "No, it's all in your head."
>
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