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Have a thick gasket made.. Lubbock Gasket and Supply 806-763 2801
On 4/7/2021 4:39 PM, Greg Lemon wrote:
> If you want to save the head you may be able to lower the compression
> ratio a bit by reshaping the combustion chamber. This is
> theoretically, I don't know how much can be removed, Kastner book
> would be a starting point, but you would probably want to take out
> more than that, measure combustion chamber size, etc.
>
> On Wed, Apr 7, 2021, 5:23 PM Dave Connitt <dconnitt@fuse.net
>
> Hi Cliff,
> A lot of racers have milled the heads of wet liner engines to
> increase compression. In Kas Kastnerâ??s TR4/TR4A competition
> preparation manual, he goes into much detail about how to reshape
> the combustion chambers in the head to reduce/eliminate â??hot
> spotsâ??. This may be the cause of your pre-ignition. Yoy may want
> to get that book and read over his cylinder head chapter.
> Regarding the push rod length, the length reduction is directly
> related to how much material is removed from the head so just
> buying shortened pushrods wonâ??t get you the best results. I think
> you should figure out how much material was removed from the
> â??stockâ?? head and shorten the pushrods accordingly.
> I think you can certainly save the head but you will need to do
> some homework reading over Kasâ??s competition prep manual and find
> a good automotive machinist for the pushrods.
> Dave Connitt
>
> Sent from my iPhone
>
>> On Apr 7, 2021, at 5:41 PM, DAVID MASSEY <dave1massey@cs.com
>>
>> 
>> I went the band-aid route on my TR3 for the same reason. But the
>> right way is to get a machinist to shorten the pushrods. BPNW
>> sells short rods for the TR6/SC engine but at that time they
>> didn't have any for the wet-sleeve engine.
>>
>> Dave
>>
>>
>>
>> -----Original Message-----
>> From: Cliff Hansen <cliff_hansen@outlook.com
>> To: list Triumph <triumphs@autox.team.net
>> Sent: Wed, Apr 7, 2021 4:23 pm
>> Subject: [TR] Advice on high compression head
>>
>> The telenovela â??Whatâ??s going on with this 4A cylinder headâ?? has
>> developed a new plot twist.
>> The head, after cleanup, measures 3.21â?? from bottom to the
>> surface for the valve cover gasket. Stock is 3.330 (if I got the
>> number correctly). Some PO cut 0.11 off, because only 0.010â?? was
>> removed in this round of clean up. Now I can see an explanation
>> for the persistent pinging Iâ??ve dealt with over the last few
>> years (head has been milled so compression is high, material near
>> intake valves has been thinned, increasing likelihood of hot
>> spots â?? Iâ??m getting this from Kastnerâ??s preparation book), which
>> I had thought was due to leaking intakes, carb shafts, or
>> operating at higher altitude.
>> As is, I canâ??t use this head because there is not enough slack in
>> the valve train to give 0.010â?? clearance on several valves. I
>> didnâ??t notice before, but now that I am looking, all the valve
>> adjusters were nearly backed out all the way.
>> Looking for advice from the list: is there any reasonable way to
>> use this head?
>> - Iâ??d prefer to reduce compression but donâ??t see any reasonable
>> way to accomplish that. I called GasketWorks and he gently
>> discouraged me from getting a custom thick head gasket, saying
>> instead Iâ??d be better off finding a head which had not been
>> milled so much.
>> Â - Shimming the rocker pedestals to get valve clearance feels
>> like a bandaid which certainly wonâ??t address the pinging
>> (assuming that the pinging is a result of the shortened head).
>> Would appreciate any advice on the way forward.
>> Cliff
>> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986>
>> for Windows 10
>>
>> Donate: http://www.team.net/donate.html
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>
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--
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World
go here: WWW.PORTERBIKES.COM/
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<p>Have a thick gasket made.. Lubbock Gasket and Supply 806-763 2801<br>
</p>
<div class="moz-cite-prefix">On 4/7/2021 4:39 PM, Greg Lemon wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAFtw3aYweWOc=4kry-Bi7TKCB_oCRy_+f=3-32ozA+GyVfH+QA@mail.gmail.com">
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<div dir="auto">If you want to save the head you may be able to
lower the compression ratio a bit by reshaping the combustion
chamber. This is theoretically, I don't know how much can be
removed, Kastner book would be a starting point, but you would
probably want to take out more than that, measure combustion
chamber size, etc.</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Apr 7, 2021, 5:23 PM
Dave Connitt <<a href="mailto:dconnitt@fuse.net";
moz-do-not-send="true">dconnitt@fuse.net</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="auto">Hi Cliff,
<div>A lot of racers have milled the heads of wet liner
engines to increase compression. In Kas Kastnerâ??s TR4/TR4A
competition preparation manual, he goes into much detail
about how to reshape the combustion chambers in the head
to reduce/eliminate â??hot spotsâ??. This may be the cause of
your pre-ignition. Yoy may want to get that book and read
over his cylinder head chapter. Regarding the push rod
length, the length reduction is directly related to how
much material is removed from the head so just buying
shortened pushrods wonâ??t get you the best results. I think
you should figure out how much material was removed from
the â??stockâ?? head and shorten the pushrods accordingly. </div>
<div>I think you can certainly save the head but you will
need to do some homework reading over Kasâ??s competition
prep manual and find a good automotive machinist for the
pushrods.</div>
<div>Dave Connitt <br>
<br>
<div dir="ltr">Sent from my iPhone</div>
<div dir="ltr"><br>
<blockquote type="cite">On Apr 7, 2021, at 5:41 PM,
DAVID MASSEY <<a href="mailto:dave1massey@cs.com";
target="_blank" rel="noreferrer"
moz-do-not-send="true">dave1massey@cs.com</a>>
wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
<div dir="ltr">
<div style="color:black;font:12pt
Arial,Helvetica,sans-serif">
<div> <font size="3">I went the band-aid route on
my TR3 for the same reason. But the right way
is to get a machinist to shorten the pushrods.Â
BPNW sells short rods for the TR6/SC engine but
at that time they didn't have any for the
wet-sleeve engine.</font><br>
</div>
<div> <br>
</div>
<div style="clear:both"><font size="4">Dave </font><br>
<br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div
style="font-family:arial,helvetica;font-size:10pt;color:black"><font
size="2">-----Original Message-----<br>
From: Cliff Hansen <<a
href="mailto:cliff_hansen@outlook.com";
target="_blank" rel="noreferrer"
moz-do-not-send="true">cliff_hansen@outlook.com</a>><br>
To: list Triumph <<a
href="mailto:triumphs@autox.team.net";
target="_blank" rel="noreferrer"
moz-do-not-send="true">triumphs@autox.team.net</a>><br>
Sent: Wed, Apr 7, 2021 4:23 pm<br>
Subject: [TR] Advice on high compression head<br>
<br>
<div id="m_5256231747994726540yiv4309632913">
<div>
<div>
<div>The telenovela â??Whatâ??s going on with
this 4A cylinder headâ?? has developed a
new plot twist.</div>
<div> Â </div>
<div>The head, after cleanup, measures
3.21â?? from bottom to the surface for the
valve cover gasket. Stock is 3.330 (if I
got the number correctly). Some PO cut
0.11 off, because only 0.010â?? was
removed in this round of clean up. Now I
can see an explanation for the
persistent pinging Iâ??ve dealt with over
the last few years (head has been milled
so compression is high, material near
intake valves has been thinned,
increasing likelihood of hot spots â?? Iâ??m
getting this from Kastnerâ??s preparation
book), which I had thought was due to
leaking intakes, carb shafts, or
operating at higher altitude.</div>
<div> Â </div>
<div>As is, I canâ??t use this head because
there is not enough slack in the valve
train to give 0.010â?? clearance on
several valves. I didnâ??t notice before,
but now that I am looking, all the valve
adjusters were nearly backed out all the
way.</div>
<div> Â </div>
<div>Looking for advice from the list: is
there any reasonable way to use this
head?</div>
<div>- Iâ??d prefer to reduce compression
but donâ??t see any reasonable way to
accomplish that. I called GasketWorks
and he gently discouraged me from
getting a custom thick head gasket,
saying instead Iâ??d be better off finding
a head which had not been milled so
much. </div>
<div>Â - Shimming the rocker pedestals to
get valve clearance feels like a bandaid
which certainly wonâ??t address the
pinging (assuming that the pinging is a
result of the shortened head).</div>
<div> Â </div>
<div>Would appreciate any advice on the
way forward.</div>
<div> Â </div>
<div>Cliff</div>
<div> Â </div>
<div>Sent from <a rel="nofollow noopener
noreferrer noreferrer"
href="https://go.microsoft.com/fwlink/?LinkId=550986";
target="_blank" moz-do-not-send="true">
Mail</a> for Windows 10</div>
<div> Â </div>
</div>
</div>
</div>
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<pre class="moz-quote-pre" wrap="">** <a class="moz-txt-link-abbreviated"
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<pre class="moz-signature" cols="72">--
Porter Custom Bicycles 2909 Arno St. NE Albuquerque, NM. 505-352-1378 My World
go here: <a class="moz-txt-link-abbreviated"
href="http://WWW.PORTERBIKES.COM/";>WWW.PORTERBIKES.COM/</a></pre>
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