Subject: [Tigers] Stock 260 Engine Camshaft Question

From: "Ronak, T.P. \(Timothy\) via Tigers" <[email-masked]>
Date: Mon, 11 May 2015 18:20:33 +0000

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The lift tolerance of the original 260 engine was stated with the technolog=
y of the day in the Performance Tuning book. Modern abilities to advance an=
d retard cams and the use of hydraulic rollers or even mechanical tappet ca=
m profiles will also affect the actual clearances realized by a particular =
combination regardless of lift and overlap.
It really should be checked to ensure you have clearance if you are conside=
ring uprating the cam as the science has changed and what seems minor may i=
n fact produce an interference problem.
If the engine is apart slap a head on and adjust the valve clearance and ch=
eck with clay.
If the engine is assembled then install weak springs on one cylinder and ch=
eck clearance every 10 degrees of rotation to ensure you have the required =
clearance ... note that advancing or retarding the cam will also affect dyn=
amic clearance and you would need to check after making that type of adjust=
ment.

The key point would be that with a 260 ci engine any cam that is usable wil=
l likely be pretty mild as the small displacement would not favour some of =
the higher lift cams as it would deliver very low power/torque down low whe=
re most street Tigers will spend all of their time.
I would personally opt for something like a Comp Cam RV Torque cam that is =
intended to build cylinder pressure at low RPM with a working RPM range of =
1500-3500 RPM.

My 2 cents :)

Tim Ronak
Senior Services Consultant Services Group
AkzoNobel Automotive and Aerospace Coatings NA
Cell  (949) 289-3357
Mailing Address
23961 Via El Rocio
Mission Viejo, CA   92691

www.akzonobel.com<http://www.akzonobel.com/>
"If a man dwells on the past, then he robs the present. But if a man ignore=
s the past, he may rob the future. The seeds of our destiny are nurtured by=
 the roots of our past." Master Po - TV's Kung Fu

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<p class=3D"MsoNormal"><span lang=3D"EN-GB">The lift tolerance of the origi=
nal 260 engine was stated with the technology of the day in the Performance=
 Tuning book. Modern abilities to advance and retard cams and the use of hy=
draulic rollers or even mechanical tappet
 cam profiles will also affect the actual clearances realized by a particul=
ar combination regardless of lift and overlap.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">It really should be checked to =
ensure you have clearance if you are considering uprating the cam as the sc=
ience has changed and what seems minor may in fact produce an interference =
problem.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If the engine is apart slap a h=
ead on and adjust the valve clearance and check with clay.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">If the engine is assembled then=
 install weak springs on one cylinder and check clearance every 10 degrees =
of rotation to ensure you have the required clearance &#8230; note that adv=
ancing or retarding the cam will also affect
 dynamic clearance and you would need to check after making that type of ad=
justment.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">The key point would be that wit=
h a 260 ci engine any cam that is usable will likely be pretty mild as the =
small displacement would not favour some of the higher lift cams as it woul=
d deliver very low power/torque down
 low where most street Tigers will spend all of their time. <o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">I would personally opt for some=
thing like a Comp Cam RV Torque cam that is intended to build cylinder pres=
sure at low RPM with a working RPM range of 1500-3500 RPM.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">My 2 cents </span><span lang=3D=
"EN-GB" style=3D"font-family:Wingdings">J</span><span lang=3D"EN-GB"> &nbsp=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:.2in"><b><span style=3D"font-=
size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">Tim Ronak=
</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&q=
uot;sans-serif&quot;">&nbsp;
<br clear=3D"all">
Senior Services Consultant Services Group<br clear=3D"all">
AkzoNobel Automotive and Aerospace Coatings NA<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-bottom:.2in"><span style=3D"font-siz=
e:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-serif&quot;">Cell&nbsp; (=
949) 289-3357<span style=3D"color:#383838">
<br clear=3D"all">
</span>Email<span style=3D"color:#383838">&nbsp; </span></span><a href=3D"m=
ailto:[email-masked]"><span style=3D"font-size:10.0pt;font-fam=
ily:&quot;Arial&quot;,&quot;sans-serif&quot;;color:blue">timothy.ronak@akzo=
nobel.com</span></a><span style=3D"font-size:10.0pt;font-family:&quot;Arial=
&quot;,&quot;sans-serif&quot;;color:#383838">
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;=
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ddress
<br clear=3D"all">
</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&q=
uot;sans-serif&quot;">23961 Via El Rocio
<br clear=3D"all">
Mission Viejo, CA&nbsp;&nbsp; 92691<br clear=3D"all">
<br>
</span><a href=3D"http://www.akzonobel.com/"><span style=3D"font-size:10.0p=
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 a man ignores the past, he may rob the future. The seeds of our destiny ar=
e nurtured by the roots of our past.&#8221;
<b>Master Po &#8211; TV&#8217;s Kung Fu</b></span><span style=3D"font-size:=
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