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 Post subject: 1850 cylinder head
PostPosted:Sun Apr 18, 2021 3:09 pm 
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Hi can anyone tell me the difference between a 1850hl (post 76) head and a tr7 head? I note the inlet valves are the same for both as to the exhaust. Is the late 1850 head unique with a smaller combustion chamber or did they just have a lower compression ratio to early 1850?


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 Post subject: Re: 1850 cylinder head
PostPosted:Sun Apr 18, 2021 4:01 pm 
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Location:Ayrshire, Scotland
As far as I know the 1850 engine had exactly the same specification throughout its production. Where are you getting the information about early and late heads being different? The 1850 head IS different to the 2 litre TR7 head.

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(MGB GTV8, and Dolomite 1850HL. New: a 1971 MGB roadster in need of welding)


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 Post subject: Re: 1850 cylinder head
PostPosted:Sun Apr 18, 2021 5:36 pm 
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The Stromberg 1850 heads had smaller diameter valves. TR7 heads are totally different, all of them.

Jeroen

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 Post subject: Re: 1850 cylinder head
PostPosted:Sun Apr 18, 2021 6:23 pm 
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The TR7 has the same bore size as a Sprint, it is kind of like an 8V Sprint. The 1850 block has a different size cylinder bore.


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 Post subject: Re: 1850 cylinder head
PostPosted:Wed Apr 21, 2021 8:48 am 
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Location:Silsoe, Beds
There are at least four cylinder heads that looks similar.
Left bank Triumph Stag
Early 1850 with smaller valves (Strombergs)
Later 1850 (SUs)
TR7

I bought a head from a stag owner as he thought that's what the head was, he was then told 1850, I was later advised that it wasn't an 1850 either but was a TR7. The V number on the side is important when looking for a replacement.

Malcolm


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 Post subject: Okay........
PostPosted:Wed Apr 21, 2021 9:20 pm 
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Joined:Thu Aug 09, 2007 12:22 pm
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Location:Caithness, Scotland
Cylinder heads for the 1850 and 1850HL are easy to distinguish visually.

1850 heads have a (water transfer) slot below the ports for cylinders 3 and 4,
said slot is not present on HL heads.

The castings themselves are other ways different, so much so that the water transfer housings not only
look different externally but are actually not interchangeable.


Ian.

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