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Forged pistons are desirable for racing engines or those that are going to =
be operated at or above the manufacturer's rev limits. If you are going to =
be operating in the normal range for normal driving they may not provide an=
advantage. Burned, melted or holed pistons are more often related to combu=
stion chamber conditions that cause excess heat or impede heat transfer. Pr=
oper ignition timing, air/fuel ratio and a reasonable compression ratio are=
critical.
After I holed two pistons I found that the cylinder head I had been using h=
ad been shaved by over 0.040" the combustion chambers were cut down to abou=
t 50cc and the compression ratio may have been over 10:1. The engine had ev=
en pinged on premium fuel and that or the imprecise timing or a combination=
of both had eventually caused the piston damage. It would not have mattere=
d if I had spent $1000 on pistons.
Bill Lawrence
BN!#554
________________________________
From: Healeys <healeys-bounces@autox.team.net> on behalf of goldengt <golde=
ngt@cal.net>
Sent: Tuesday, November 15, 2016 12:03:09 AM
To: Bob Spidell; healeys
Subject: Re: [Healeys] Pistons
I think my JE forged was a good choice after two rebuilds due to melted pis=
tons over the years.
Ken Freese
Sent from my Verizon, Samsung Galaxy smartphone
-------- Original message --------
From: Bob Spidell <bspidell@comcast.net>
Date: 11/14/16 11:47 AM (GMT-08:00)
To: healeys <healeys@autox.team.net>
Subject: [Healeys] Pistons
Thinking about which pistons to buy form my BJ8 rebuild. 'Generic' sets ru=
n about $400 and look OK--as if you can tell by looking at pictures--and th=
e top-of the line appear to be Denis Welch's forged pistons (at nearly a gr=
and$). Are the forged ones worth it? Also, most 'stock' sets are 5-riing,=
and the DWR are 3. Obviously, the 3-ring would have less friction/drag th=
an the 5-ring, but would the difference be significant in a mostly stock st=
reet car?
Also, any recommendations on brands or suppliers?
TIA,
Bob
--------------------------------
Bob Spidell - San Jose, CA
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>
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<body>
<style type=3D"text/css" style=3D"display:none;"><!-- P {margin-top:0;margi=
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<div id=3D"divtagdefaultwrapper" style=3D"font-size:12pt;color:#000000;font=
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<p>Forged pistons are desirable for racing engines or those that are going =
to be operated at or above the manufacturer's rev limits. If you are going =
to be operating in the normal range for normal driving they may not provide=
an advantage. Burned, melted or
holed pistons are more often related to combustion chamber conditions that=
cause excess heat or impede heat transfer. Proper ignition timing, air/fue=
l ratio and a reasonable compression ratio are critical. </p>
<p><br>
</p>
<p>After I holed two pistons I found that the cylinder head I had been =
;using had been shaved by over 0.040" the combustion chambers wer=
e cut down to about 50cc and the compression ratio may have been over 10:1.=
The engine had even pinged on premium fuel and
that or the imprecise timing or a combination of both had eventually =
caused the piston damage. It would not have mattered if I had spent $1000 o=
n pistons.</p>
<p><br>
</p>
<p>Bill Lawrence</p>
<p>BN!#554 </p>
</div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" st=
yle=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Healeys <healeys-b=
ounces@autox.team.net> on behalf of goldengt <goldengt@cal.net><br=
>
<b>Sent:</b> Tuesday, November 15, 2016 12:03:09 AM<br>
<b>To:</b> Bob Spidell; healeys<br>
<b>Subject:</b> Re: [Healeys] Pistons</font>
<div> </div>
</div>
<div>
<div>I think my JE forged was a good choice after two rebuilds due to melte=
d pistons over the years. </div>
<div>Ken Freese </div>
<div><br>
</div>
<div><br>
</div>
<div><br>
</div>
<div id=3D"composer_signature">
<div style=3D"font-size:85%;color:#575757" dir=3D"auto">Sent from my Verizo=
n, Samsung Galaxy smartphone</div>
</div>
<div><br>
</div>
<div style=3D"font-size:100%;color:#000000"><!-- originalMessage -->
<div>-------- Original message --------</div>
<div>From: Bob Spidell <bspidell@comcast.net> </div>
<div>Date: 11/14/16 11:47 AM (GMT-08:00) </div>
<div>To: healeys <healeys@autox.team.net> </div>
<div>Subject: [Healeys] Pistons </div>
<div><br>
</div>
</div>
<div style=3D"font-family: Arial; font-size: 12pt; color: #000000">
<div>Thinking about which pistons to buy form my BJ8 rebuild. 'Generi=
c' sets run about $400 and look OK--as if you can tell by looking at pictur=
es--and the top-of the line appear to be Denis Welch's forged pistons (at n=
early a grand$). Are the forged ones
worth it? Also, most 'stock' sets are 5-riing, and the DWR are 3.&nb=
sp; Obviously, the 3-ring would have less friction/drag than the 5-ring, bu=
t would the difference be significant in a mostly stock street car?<br>
<br>
Also, any recommendations on brands or suppliers?</div>
<div><br>
</div>
<div>TIA,</div>
<div>Bob</div>
<div><br>
</div>
<div><span name=3D"x"></span>--------------------------------<br>
Bob Spidell - San Jose, CA<span name=3D"x"></span><br>
</div>
<div><br>
</div>
</div>
</div>
</body>
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