This is a multipart message in MIME format.
--===============5965550708254331395==
boundary="----=_NextPart_000_002F_01DA44F0.B23B1FF0"
Content-Language: de
This is a multipart message in MIME format.
------=_NextPart_000_002F_01DA44F0.B23B1FF0
charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
That is one thing to consider.
When is turbulence supporting and when is turbulence overdone and =
disturbing.
=20
I could imagine to force too much turbulence with a very small squish =
gap the flame front expansion is compromised, thus slows down, and =
lowers the hp output.
That=E2=80=99s why we had the best power with 0.047=E2=80=9D gap.
=20
Cheers
Chris
=20
=20
From: Fot <fot-bounces@autox.team.net> On Behalf Of fubog1 via Fot
Sent: Thursday, January 11, 2024 8:01 PM
To: Lorne Fritz <lorne.fritz@gmail.com>; Steven Belfer =
<steve@artwithcars.com>
Cc: fot@autox.team.net
Subject: Re: [Fot] Piston to head clearance
=20
Steve nailed it, both on the ##s, & the importance of it.
It depends on what rods & crank, piston to wall clearance & what RPM, =
but for most applications that's right in the ballpark.
I've run as little as oops not enough ie .025 or less, .028 minimum (you =
won't get any carbon deposit on the squish area), but to play it safe =
nowadays I use .030-.032
Also on these engines it's not only a CR related issue, the squish is =
very critical, you want to minimize the clearance between piston top & =
head to maximize the squish effect, which creates turbulence, which =
assists in good combustion...
=20
Glen Efinger.
=20
=20
On Thursday, January 11, 2024 at 01:00:50 PM EST, Steven Belfer via Fot =
=20
=20
You want as little as necessary because this is where your high CR comes =
from. The thickness of the head gasket is the major part of P to H =
clearance. I ran .026 P to H clearance at Cal Speedway and the piston =
kissed the head and I spun a bearing. My machine shop guy likes .040 =
for safety but I=E2=80=99ve been running .032 and it=E2=80=99s working =
out great
~Steve
> On Jan 11, 2024, at 9:13=E2=80=AFAM, Lorne Fritz via Fot =
>=20
> =EF=BB=BF
> Hi. In the past I have had pistons hit the head and leave a =
mark(TR3/4). What piston to head clearance are most of you running? =
Thanks in advance, Lorne
> _______________________________________________
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive =
http://www.team.net/pipermail/fot
> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/steve@artwithcars.com
>=20
>=20
_______________________________________________
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
http://autox.team.net/mailman/options/fot/fubog1@aol.com
------=_NextPart_000_002F_01DA44F0.B23B1FF0
charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
<html xmlns:v=3D"urn:schemas-microsoft-com:vml" =
xmlns:o=3D"urn:schemas-microsoft-com:office:office" =
xmlns:w=3D"urn:schemas-microsoft-com:office:word" =
xmlns:m=3D"http://schemas.microsoft.com/office/2004/12/omml"; =
xmlns=3D"http://www.w3.org/TR/REC-html40";><head><meta =
http-equiv=3DContent-Type content=3D"text/html; charset=3Dutf-8"><meta =
name=3DGenerator content=3D"Microsoft Word 15 (filtered =
medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
font-size:11.0pt;
font-family:"Calibri",sans-serif;}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
span.E-MailFormatvorlage19
{mso-style-type:personal-reply;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;
mso-ligatures:none;}
@page WordSection1
{size:612.0pt 792.0pt;
margin:70.85pt 70.85pt 2.0cm 70.85pt;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DEN-US link=3Dblue =
vlink=3Dpurple style=3D'word-wrap:break-word'><div =
class=3DWordSection1><p class=3DMsoNormal>That is one thing to =
consider.<o:p></o:p></p><p class=3DMsoNormal>When is turbulence =
supporting and when is turbulence overdone and =
disturbing.<o:p></o:p></p><p class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>I could imagine to force too much turbulence with a =
very small squish gap the flame front expansion is compromised, thus =
slows down, and lowers the hp output.<o:p></o:p></p><p =
class=3DMsoNormal>That=E2=80=99s why we had the best power with =
0.047=E2=80=9D gap.<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal>Cheers<o:p></o:p></p><p =
class=3DMsoNormal>Chris<o:p></o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><p =
class=3DMsoNormal><o:p> </o:p></p><div><div =
style=3D'border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal><b><span lang=3DDE>From:</span></b><span =
lang=3DDE> Fot <fot-bounces@autox.team.net> <b>On Behalf Of =
</b>fubog1 via Fot<br><b>Sent:</b> Thursday, January 11, 2024 8:01 =
PM<br><b>To:</b> Lorne Fritz <lorne.fritz@gmail.com>; Steven =
Belfer <steve@artwithcars.com><br><b>Cc:</b> =
fot@autox.team.net<br><b>Subject:</b> Re: [Fot] Piston to head =
clearance<o:p></o:p></span></p></div></div><p =
class=3DMsoNormal><o:p> </o:p></p><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Steve nailed =
it, both on the ##s, & the importance of =
it.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>It depends on =
what rods & crank, piston to wall clearance & what RPM, but for =
most applications that's right in the =
ballpark.<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>I've run as =
little as oops not enough ie .025 or less, .028 minimum (you won't get =
any carbon deposit on the squish area), but to play it safe nowadays I =
use .030-.032<o:p></o:p></span></p></div><div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Also on these =
engines it's not only a CR related issue, the squish is very critical, =
you want to minimize the clearance between piston top & head to =
maximize the squish effect, which creates turbulence, which assists in =
good combustion...<o:p></o:p></span></p></div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p> </o:=
p></span></p></div><div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'>Glen =
Efinger.<o:p></o:p></span></p></div></div></div></div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p> </o:=
p></span></p></div></div><div><p class=3DMsoNormal><span =
style=3D'font-size:12.0pt;font-family:"Arial",sans-serif'><o:p> </o:=
p></span></p></div></div><div =
id=3D"ydpeb00682yahoo_quoted_5223032547"><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282=
A'>On Thursday, January 11, 2024 at 01:00:50 PM EST, Steven Belfer via =
Fot <<a href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>> =
wrote: <o:p></o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282=
A'><o:p> </o:p></span></p></div><div><p class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282=
A'><o:p> </o:p></span></p></div><div><div><p =
class=3DMsoNormal><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282=
A'>You want as little as necessary because this is where your high CR =
comes from. The thickness of the head gasket is the major part of =
P to H clearance. I ran .026 P to H clearance at Cal Speedway and =
the piston kissed the head and I spun a bearing. My machine shop =
guy likes .040 for safety but I=E2=80=99ve been running .032 and =
it=E2=80=99s working out great<br>~Steve<br><br><br>> On Jan 11, =
2024, at 9:13=E2=80=AFAM, Lorne Fritz via Fot <<a =
href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank">fot@autox.team.net</a>> wrote:<br>> <br>> =
</span><span =
style=3D'font-size:10.0pt;font-family:"Tahoma",sans-serif;color:#26282A'>=
=EF=BB=BF</span><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282=
A'><br>> Hi. In the past I have had pistons hit the head and =
leave a mark(TR3/4). What piston to head clearance are most of you =
running? Thanks in advance, Lorne<br>> =
_______________________________________________<br>> <a =
href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank">fot@autox.team.net</a><br>> <br>> <a =
href=3D"http://www.fot-racing.com"; =
target=3D"_blank">http://www.fot-racing.com</a><br>> <br>> Donate: =
<a href=3D"http://www.team.net/donate.html"; =
target=3D"_blank">http://www.team.net/donate.html</a><br>> Archive: =
<a href=3D"http://autox.team.net/archive"; =
target=3D"_blank">http://autox.team.net/archive</a> <a =
href=3D"http://www.team.net/pipermail/fot"; =
target=3D"_blank">http://www.team.net/pipermail/fot</a><br>> =
href=3D"http://autox.team.net/mailman/options/fot/steve@artwithcars.com"; =
target=3D"_blank">http://autox.team.net/mailman/options/fot/steve@artwith=
cars.com</a><o:p></o:p></span></p><div id=3Dydpeb00682yqtfd30826><p =
class=3DMsoNormal style=3D'margin-bottom:12.0pt'><span =
style=3D'font-size:10.0pt;font-family:"Helvetica",sans-serif;color:#26282=
A'><br>> <br>> =
<br>_______________________________________________<br><a =
href=3D"mailto:fot@autox.team.net"; =
target=3D"_blank">fot@autox.team.net</a><br><br><a =
href=3D"http://www.fot-racing.com"; =
target=3D"_blank">http://www.fot-racing.com</a><br><br>Donate: <a =
href=3D"http://www.team.net/donate.html"; =
target=3D"_blank">http://www.team.net/donate.html</a><br>Archive: <a =
href=3D"http://autox.team.net/archive"; =
target=3D"_blank">http://autox.team.net/archive</a> <a =
href=3D"http://www.team.net/pipermail/fot"; =
target=3D"_blank">http://www.team.net/pipermail/fot</a><br>Unsubscribe/Ma=
nage: <a =
href=3D"http://autox.team.net/mailman/options/fot/fubog1@aol.com"; =
target=3D"_blank">http://autox.team.net/mailman/options/fot/fubog1@aol.co=
m</a><br><br><o:p></o:p></span></p></div></div></div></div></div></div></=
body></html>
------=_NextPart_000_002F_01DA44F0.B23B1FF0--
--===============5965550708254331395==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
--===============5965550708254331395==--
|