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Yeah, but that=E2=80=99s just step one--after you measure the volume of =
the combustion chamber you still need to know all the stuff Steve Yott =
mentions. At least you do if you want to know the actual compression =
ratio.=20
=20
> On Sep 23, 2016, at 9:19 PM, Steven Belfer <steve@artwithcars.com> =
wrote:
>=20
> Get Kas' book. There's a helpful section describing how to CC the head =
using a plate of plexiglass and measuring how much fluid you can fill it =
with.=20
>=20
> ~Steve
>=20
>=20
>> On Sep 23, 2016, at 8:14 PM, Steve Yott <tr4@wi.rr.com =
>>=20
>> Steve,
>> In order to calculate the combustion chamber volume desired you need =
also know the bore, stroke, head gasket diameter and thickness, piston =
to liner clearance, depth of the top ring and deck clearance of the =
piston (or pop up if you are running any). These all make up the total =
volume which you need to calculate the chamber volume you need for the =
static compression ratio you desire. Also when doing a chamber volume =
test don't forget that the valve head thickness will affect this =
measurement.
>>=20
>> There are a good number of web sites out there that will do all these =
calculations for you and give you a required chamber volume for the =
desired compression ratio. There are various head castings out there so =
I would not take the thickness into account except for a rough idea.
>>=20
>> This all creates a "static" compression ratio and will not mean much =
when the dynamics of the cam and valve overlap come into play and create =
the "dynamic" compression ratio.... wish there were a good method of =
calculating that!
>>=20
>> Steve Yott
>>=20
>>=20
>>=20
>> -----Original Message-----
>> From: Fot [mailto:fot-bounces@autox.team.net] On Behalf Of Stephen =
Borowski
>> Sent: Friday, September 23, 2016 6:45 PM
>> To: FOT Triumph <fot@autox.team.net>
>> Subject: [Fot] TR4 Compression Ratio Calculation Question
>>=20
>> Hello All,
>> Does any one know the "chamber volumes" vs "compression ratio=E2=80=9D =
for the TR4 high port head. What should the head thickness measure?
>>=20
>> All comments welcome!
>>=20
>> Thxs. Steve
>> _______________________________________________
>> fot@autox.team.net
>>=20
>> http://www.fot-racing.com
>>=20
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/archive
>> Forums: http://www.team.net/forums
>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/tr4@wi.rr.com
>>=20
>>=20
>>=20
>> _______________________________________________
>> fot@autox.team.net
>>=20
>> http://www.fot-racing.com
>>=20
>> Donate: http://www.team.net/donate.html
>> Archive: http://www.team.net/archive
>> Forums: http://www.team.net/forums
>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/steve@artwithcars.com =
<http://autox.team.net/mailman/options/fot/steve@artwithcars.com>
>>=20
>>=20
> _______________________________________________
>=20
> http://www.fot-racing.com <http://www.fot-racing.com/>
>=20
> Donate: http://www.team.net/donate.html =
<http://www.team.net/donate.html>
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> Unsubscribe/Manage: =
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" =
class=3D"">Yeah, but that=E2=80=99s just step one--after you measure the =
volume of the combustion chamber you still need to know all the stuff =
Steve Yott mentions. At least you do if you want to know the actual =
compression ratio. <div class=3D""> <br =
class=3D""><div><blockquote type=3D"cite" class=3D""><div class=3D"">On =
Sep 23, 2016, at 9:19 PM, Steven Belfer <<a =
href=3D"mailto:steve@artwithcars.com"; =
class=3D"">steve@artwithcars.com</a>> wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><span =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; float: none; display: inline =
!important;" class=3D"">Get Kas' book. There's a helpful section =
describing how to CC the head using a plate of plexiglass and measuring =
how much fluid you can fill it with.<span =
class=3D"Apple-converted-space"> </span></span><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;" class=3D""><span style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; orphans: auto; text-align: start; text-indent: =
0px; text-transform: none; white-space: normal; widows: auto; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; float: none; display: =
inline !important;" class=3D"">~Steve</span><br style=3D"font-family: =
Helvetica; font-size: 12px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; orphans: auto; =
text-align: start; text-indent: 0px; text-transform: none; white-space: =
normal; widows: auto; word-spacing: 0px; -webkit-text-stroke-width: =
0px;" class=3D""><br style=3D"font-family: Helvetica; font-size: 12px; =
font-style: normal; font-variant-caps: normal; font-weight: normal; =
letter-spacing: normal; orphans: auto; text-align: start; text-indent: =
0px; text-transform: none; white-space: normal; widows: auto; =
word-spacing: 0px; -webkit-text-stroke-width: 0px;" class=3D""><br =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D""><blockquote type=3D"cite" =
style=3D"font-family: Helvetica; font-size: 12px; font-style: normal; =
font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
orphans: auto; text-align: start; text-indent: 0px; text-transform: =
none; white-space: normal; widows: auto; word-spacing: 0px; =
-webkit-text-stroke-width: 0px;" class=3D"">On Sep 23, 2016, at 8:14 PM, =
Steve Yott <<a href=3D"mailto:tr4@wi.rr.com"; =
class=3D"">tr4@wi.rr.com</a>> wrote:<br class=3D""><br =
class=3D"">Steve,<br class=3D"">In order to calculate the combustion =
chamber volume desired you need also know the bore, stroke, head gasket =
diameter and thickness, piston to liner clearance, depth of the top ring =
and deck clearance of the piston (or pop up if you are running any). =
These all make up the total volume which you need to calculate the =
chamber volume you need for the static compression ratio you desire. =
Also when doing a chamber volume test don't forget that the valve =
head thickness will affect this measurement.<br class=3D""><br =
class=3D"">There are a good number of web sites out there that will do =
all these calculations for you and give you a required chamber volume =
for the desired compression ratio. There are various head castings =
out there so I would not take the thickness into account except for a =
rough idea.<br class=3D""><br class=3D"">This all creates a "static" =
compression ratio and will not mean much when the dynamics of the cam =
and valve overlap come into play and create the "dynamic" compression =
ratio.... wish there were a good method of calculating that!<br =
class=3D""><br class=3D"">Steve Yott<br class=3D""><br class=3D""><br =
class=3D""><br class=3D"">-----Original Message-----<br class=3D"">From: =
Fot [<a href=3D"mailto:fot-bounces@autox.team.net"; =
class=3D"">mailto:fot-bounces@autox.team.net</a>] On Behalf Of Stephen =
Borowski<br class=3D"">Sent: Friday, September 23, 2016 6:45 PM<br =
class=3D"">To: FOT Triumph <<a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>><br class=3D"">Subject: [Fot] TR4 =
Compression Ratio Calculation Question<br class=3D""><br class=3D"">Hello =
All,<br class=3D"">Does any one know the "chamber volumes" vs =
"compression ratio=E2=80=9D for the TR4 high port head. What should the =
head thickness measure?<br class=3D""><br class=3D"">All comments =
welcome!<br class=3D""><br class=3D"">Thxs. Steve<br =
class=3D"">_______________________________________________<br =
class=3D""><a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a><br class=3D""><br =
class=3D"">http://www.fot-racing.com<br class=3D""><br class=3D"">Donate: =
http://www.team.net/forums<br class=3D"">Unsubscribe/Manage: =
http://autox.team.net/mailman/options/fot/tr4@wi.rr.com<br class=3D""><br =
class=3D""><br class=3D""><br =
class=3D"">_______________________________________________<br =
class=3D"">fot@autox.team.net<br class=3D""><br =
class=3D"">http://www.fot-racing.com<br class=3D""><br class=3D"">Donate: =
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!important;" =
class=3D"">_______________________________________________</span><br =
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font-variant-caps: normal; font-weight: normal; letter-spacing: normal; =
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_______________________________________________
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http://www.fot-racing.com
Archive: http://www.team.net/archive
--===============2711103454588993297==--
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