Subject: [Fot] TR intake gaskets

From: Philip Gott via Fot <[email-masked]>
Date: Wed, 9 Apr 2025 06:01:40 -0400

Lyman;
Are you certain that the manifold and head mounting surfaces are flat? We’ve seen this with manifolds that have warped a bit.
As Dave recommended earlier, the thicker high performance Remflex gaskets available from Moss or the even thicker ones from Brian at British Frame and Engine will accommodate some of this, but not all. The clamping force is low due to the need for the exhaust manifold to slide on the gasket and hence the limited bolt tightening torque recommended.
Hope this helps,
Phil Gott
Sent from my iPhone

> On Apr 8, 2025, at 7:01 PM, Lyman Scherer via Fot <[email-masked]> wrote:
> 
> Stock TR Moss Motors intake gasket. #1 intake port blow-out, #4 port did same blow-out weeks prior
> No exhaust port leaks!!!
> This is BajaTR3 engine that never had this issue, raced for years.
> Difference: used existing TR4 intakes and headers. Clamping type in not stock TR. Probably the cause!
> Are copper gasket available??
> Or better recommendations ??
> I can have gaskets made, just asking for experienced thoughts.
> Cheers, Lyman S.
> 
> 
> 
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---

From: Philip Gott via Fot <[email-masked]>
Date: Thu, 10 Apr 2025 08:04:27 -0400

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Happy to help! See you at Lime Rock!<div>Ph=
il<br id=3D"lineBreakAtBeginningOfSignature"><div dir=3D"ltr">Sent from my i=
Phone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Apr 10, 2025, a=
t 12:01=E2=80=AFAM, Lyman Scherer via Fot &lt;[email-masked]&gt; wrote:<=
br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF=
<meta http-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-8">Joe=
B. You have great advise on the dowel-stud upgrade, much more positive clamp=
ing. No time this round, engine getting rebuilt for BajaTR3 after LimeRock. W=
ill do both TR4 engine in process and BajaTR. Thanks<div><div dir=3D"ltr">Se=
nt from my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Apr=
 9, 2025, at 7:08=E2=80=AFPM, Lyman Scherer &lt;[email-masked]&gt; wrot=
e:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=
=BF<meta http-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-8">=
Phil=E2=80=A6 pretty sure you are correct on the mis-match of clamping, head=
ers are a mess, intakes ok. All sealing surfaces are good &amp; flat. Going t=
o start from scratch. Remflex gaskets, nice 3/8 shoulder bolts I have, fab n=
ew cross clamps, service headers even though had no exhaust leaks. Thx for a=
dvice!<br id=3D"lineBreakAtBeginningOfSignature"><div dir=3D"ltr">Sent from m=
y iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Apr 9, 2025,=
 at 7:46=E2=80=AFAM, Bob Kramer via Fot &lt;[email-masked]&gt; wrote:<br=
><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF=
<div dir=3D"ltr">Getting to the two bottom nuts gets even more&nbsp;difficul=
t when you add a support bracketing to take the place of the OEM bolting of t=
he intake to the exhaust&nbsp;manifold that we lose when using a header, thu=
s it is easier to get it wrong.</div><br><div class=3D"gmail_quote gmail_quo=
te_container"><div dir=3D"ltr" class=3D"gmail_attr">On Wed, Apr 9, 2025 at 7=
:48=E2=80=AFAM yellow04 via Fot &lt;<a href=3D"mailto:[email-masked]">fo=
[email-masked]</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padd=
ing-left:1ex"><div style=3D"font-size:10pt;font-family:Verdana,Geneva,sans-s=
erif">
<p>My money is on this one... Blowing out the bottom of the intake gaskets m=
eans you didn't get nearly enough pressure (if any) from that pesky lower mo=
unting stud and clamp. I have found if you use anything other than a stock i=
ntake manifold and stock exhaust manifold, you must scrutinize the area wher=
e the clamps will sit to ensure the height is very similar. Or, modify the c=
lamps by welding on something to make sure when the clamp rests on the appro=
priate bits of the intake and exhaust manifold, when the nut is tightened it=
 puts equal pressure on both manifolds.&nbsp;Obviously, the mounting face on=
 each manifold needs to be flat. Assuming you have everything in order, ther=
e is no reason a stock manifold gasket will not work, I have run them when I=
 could not get my hands on the HD gaskets and they worked fine for me.&nbsp;=
</p>
<p>Last thought, the nuts that hold the manifolds on are notorious for loose=
ning up in time, and especially after the first few heat cycles. And with ev=
erything installed, getting to the two bottom nuts can be a pain. But, failu=
re to keep them properly torqued leads to blown out gaskets.</p>
<div id=3D"m_8205082758269726652signature">&nbsp;</div>
<p><br></p>
<p id=3D"m_8205082758269726652reply-intro">On 2025-04-09 06:55, vfracing--- v=
ia Fot wrote:</p>
<blockquote type=3D"cite" style=3D"padding:0px 0.4em;border-left:2px solid r=
gb(16,16,255);margin:0px">
<div id=3D"m_8205082758269726652replybody1">
<div>
<div style=3D"font-family:arial;font-size:16px">
<div>&nbsp;</div>
<div dir=3D"ltr">Lyman;</div>
<div dir=3D"ltr">&nbsp;</div>
<div dir=3D"ltr">&nbsp;another possible cause is a mis match in the thicknes=
ses of the intake and exhaust manifold flanges.</div>
</div>
</div>
</div>
</blockquote>
</div>
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