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On 11/30/19 9:08 AM, van.mulders.marcel@telenet.be wrote:
> That's interesting and may well be the reason.
> The passages (the one in my cylinderhead and the 6 holes in the other head)
> have a diameter of about 12mm). So these passages are facing the block and
> are located precisely beneath the exhaust ports. My cylinderhead has all the
> work done, so I'd rather add these passages than searching for another
> cylinderhead.
> Marcel
There are usually thin walls between water passages and exhaust passage
ways and the spaces around the combustion chambers follow curves. It is
not just a straight drilled hole.
I suggest you chalk up your existing head as practice and start again
with an earlier head.
TeriAnn
>
> ----- Oorspronkelijk bericht -----
> Van: "fot" <fot@autox.team.net>
> Aan: "fot" <fot@autox.team.net>
> Verzonden: Zaterdag 30 november 2019 16:50:06
> Onderwerp: Re: [Fot] TR6 cylinderheads
>
> Comparing the cylinderhead of this engine with another 6 cylinder head
> (probably also from a TR6 , but from a� Triumph saloon is also possible)
> : it turns out that my cylinderhead is lacking 5 coolant passages. My
> cylinderhead has only a passage just beneath outlet port no 6. The other
> cylinderhead has passages beneath every outlet port. I didn't know of
> this difference� between 6 cylinder heads.
>
>
> Just a WAG. In the late 1960s and 1970s SMOG regulations were kicking
> in. One of the first things that manufacturers did was have their
> engines run hotter. Some manufacturers accomplished that by reducing
> coolant flow through cylinder heads, reducing passage size and/ or
> eliminating cooling passages. My WAG is that you have a late TR6 head
> intended for the US or just California market. I suggest going shopping
> for an earlier head that still has all the passages.
>
> TeriAnn
> Who knows nothing about TR6 heads
>
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<div class="moz-cite-prefix">On 11/30/19 9:08 AM,
<a class="moz-txt-link-abbreviated"
href="mailto:van.mulders.marcel@telenet.be";>van.mulders.marcel@telenet.be</a>
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:807951668.59641828.1575130095427.JavaMail.zimbra@telenet.be">
<pre class="moz-quote-pre" wrap="">That's interesting and may well be the
reason.
The passages (the one in my cylinderhead and the 6 holes in the other head)
have a diameter of about 12mm). So these passages are facing the block and are
located precisely beneath the exhaust ports. My cylinderhead has all the work
done, so I'd rather add these passages than searching for another cylinderhead.
Marcel</pre>
</blockquote>
<p>There are usually thin walls between water passages and exhaust
passage ways and the spaces around the combustion chambers follow
curves. It is not just a straight drilled hole.</p>
<p>I suggest you chalk up your existing head as practice and start
again with an earlier head.</p>
<p>TeriAnn<br>
</p>
<p><br>
</p>
<p><font size="1" face="Arial"><img
src="http://atlanticz.ca/zclub/techtips/headporting/exhaustport.jpg";
width="768" height="512" border="0"></font></p>
<blockquote type="cite"
cite="mid:807951668.59641828.1575130095427.JavaMail.zimbra@telenet.be">
<pre class="moz-quote-pre" wrap="">
----- Oorspronkelijk bericht -----
Van: "fot" <a class="moz-txt-link-rfc2396E"
href="mailto:fot@autox.team.net";><fot@autox.team.net></a>
Aan: "fot" <a class="moz-txt-link-rfc2396E"
href="mailto:fot@autox.team.net";><fot@autox.team.net></a>
Verzonden: Zaterdag 30 november 2019 16:50:06
Onderwerp: Re: [Fot] TR6 cylinderheads
Comparing the cylinderhead of this engine with another 6 cylinder head
(probably also from a TR6 , but from a� Triumph saloon is also possible)
: it turns out that my cylinderhead is lacking 5 coolant passages. My
cylinderhead has only a passage just beneath outlet port no 6. The other
cylinderhead has passages beneath every outlet port. I didn't know of
this difference� between 6 cylinder heads.
Just a WAG. In the late 1960s and 1970s SMOG regulations were kicking
in. One of the first things that manufacturers did was have their
engines run hotter. Some manufacturers accomplished that by reducing
coolant flow through cylinder heads, reducing passage size and/ or
eliminating cooling passages. My WAG is that you have a late TR6 head
intended for the US or just California market. I suggest going shopping
for an earlier head that still has all the passages.
TeriAnn
Who knows nothing about TR6 heads
</pre>
</blockquote>
<br>
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_______________________________________________
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http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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![http://atlanticz.ca/zclub/techtips/headporting/exhaustport.jpg"](http://atlanticz.ca/zclub/techtips/headporting/exhaustport.jpg"){kind=link}