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Getting down to the less than tenths of a C.C. is fine for really accurate
compression ratios, but in the end you are measuring a ratio of VOLUMES not
pressures so the thing to put in your mind is the effect on the percentage
of volumetric efficiency.
Now for that you have to take a fine pointed thing, aim it at the engine
and ask " How good are you?" Then start at the top of the heap of
volumetric possibilities. Turbo and/or supercharger 100% plus, overhead
cam, 4 valves, fuel injection around 95%, most triumph engines about 89-91%
at best. Now that 13 to 1 volume ratio does not look so impressive, but
does put a nice crackle in the exhaust note and seems to help a bunch down
the long straights.
As in so many things like this I am just guessing along with everyone else.
*Never be beaten by equipment.*
On Fri, Sep 23, 2016 at 10:33 PM, Bill <ponobill@gmail.com> wrote:
> Yeah, but that=E2=80=99s just step one--after you measure the volume of t=
he
> 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 rati=
o.
>
>
> On Sep 23, 2016, at 9:19 PM, Steven Belfer <steve@artwithcars.com> wrote:
>
> 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.
>
> ~Steve
>
>
> On Sep 23, 2016, at 8:14 PM, Steve Yott <tr4@wi.rr.com> wrote:
>
> Steve,
> In order to calculate the combustion chamber volume desired you need also
> know the bore, stroke, head gasket diameter and thickness, piston to line=
r
> 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 tha=
t
> the valve head thickness will affect this measurement.
>
> 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 desir=
ed
> compression ratio. There are various head castings out there so I would
> not take the thickness into account except for a rough idea.
>
> 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!
>
> Steve Yott
>
>
>
> -----Original Message-----
> From: Fot [mailto:fot-bounces@autox.team.net <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
>
> Hello All,
> Does any one know the "chamber volumes" vs "compression ratio=E2=80=9D fo=
r the TR4
> high port head. What should the head thickness measure?
>
> All comments welcome!
>
> Thxs. Steve
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
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> options/fot/tr4@wi.rr.com
>
>
>
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>
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>
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>
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>
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>
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>
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>
--001a11394e2c6f8b9c053d42a76a
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<div dir=3D"ltr">Getting down to the less than tenths of a C.C. is fine for=
really accurate compression ratios, but in the end you are measuring a rat=
io of VOLUMES not pressures so the thing to put in your mind is the effect =
on the percentage of volumetric efficiency.=C2=A0<div><br></div><div>Now fo=
r that you have to take a fine pointed thing, aim it at the engine and ask =
" How good are you?" Then start at the top of the heap of volumet=
ric possibilities.=C2=A0 Turbo and/or supercharger 100% plus, overhead cam,=
4 valves, fuel injection around 95%, most triumph engines about 89-91% at =
best. Now that 13 to 1 volume ratio does not look so impressive, but does p=
ut a nice crackle in the exhaust note and seems to help a bunch down the lo=
ng straights.</div><div>As in so many things like this I am just guessing a=
long with everyone else.=C2=A0<div><br></div><div><br></div></div></div><di=
v class=3D"gmail_extra"><br clear=3D"all"><div><div class=3D"gmail_signatur=
e" data-smartmail=3D"gmail_signature"><p><strong><font color=3D"#000099">Ne=
ver be beaten by equipment.</font></strong></p></div></div>
<br><div class=3D"gmail_quote">On Fri, Sep 23, 2016 at 10:33 PM, Bill <span=
dir=3D"ltr"><<a href=3D"mailto:ponobill@gmail.com"; target=3D"_blank">po=
nobill@gmail.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote"=
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv style=3D"word-wrap:break-word">Yeah, but that=E2=80=99s just step one--a=
fter you measure the volume of the combustion chamber you still need to kno=
w all the stuff Steve Yott mentions. At least you do if you want to know th=
e actual compression ratio.=C2=A0<div>=C2=A0<br><div><blockquote type=3D"ci=
te"><div>On Sep 23, 2016, at 9:19 PM, Steven Belfer <<a href=3D"mailto:s=
teve@artwithcars.com" target=3D"_blank">steve@artwithcars.com</a>> wrote=
:</div><br><div><span style=3D"font-family:Helvetica;font-size:12px;font-st=
yle:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-i=
ndent:0px;text-transform:none;white-space:normal;word-spacing:0px;float:non=
e;display:inline!important">Get Kas' book. There's a helpful sectio=
n describing how to CC the head using a plate of plexiglass and measuring h=
ow much fluid you can fill it with.<span>=C2=A0</span></span><br style=3D"f=
ont-family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;le=
tter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;wh=
ite-space:normal;word-spacing:0px"><br style=3D"font-family:Helvetica;font-=
size:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-a=
lign:start;text-indent:0px;text-transform:none;white-space:normal;word-spac=
ing:0px"><span style=3D"font-family:Helvetica;font-size:12px;font-style:nor=
mal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0=
px;text-transform:none;white-space:normal;word-spacing:0px;float:none;displ=
ay:inline!important">~Steve</span><br style=3D"font-family:Helvetica;font-s=
ize:12px;font-style:normal;font-weight:normal;letter-spacing:normal;text-al=
ign:start;text-indent:0px;text-transform:none;white-space:normal;word-spaci=
ng:0px"><br style=3D"font-family:Helvetica;font-size:12px;font-style:normal=
;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;=
text-transform:none;white-space:normal;word-spacing:0px"><br style=3D"font-=
family:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter=
-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white-=
space:normal;word-spacing:0px"><blockquote type=3D"cite" style=3D"font-fami=
ly:Helvetica;font-size:12px;font-style:normal;font-weight:normal;letter-spa=
cing:normal;text-align:start;text-indent:0px;text-transform:none;white-spac=
e:normal;word-spacing:0px">On Sep 23, 2016, at 8:14 PM, Steve Yott <<a h=
ref=3D"mailto:tr4@wi.rr.com"; target=3D"_blank">tr4@wi.rr.com</a>> wrote:=
<br><br>Steve,<br>In order to calculate the combustion chamber volume desir=
ed 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).=C2=A0 These all make up the tot=
al volume which you need to calculate the chamber volume you need for the s=
tatic compression ratio you desire.=C2=A0 Also when doing a chamber volume =
test don't forget that the valve head thickness will affect this measur=
ement.<br><br>There are a good number of web sites out there that will do a=
ll these calculations for you and give you a required chamber volume for th=
e desired compression ratio.=C2=A0 There are various head castings out ther=
e so I would not take the thickness into account except for a rough idea.<b=
r><br>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 goo=
d method of calculating that!<br><br>Steve Yott<br><br><br><br>-----Origina=
l Message-----<br>From: Fot [<a href=3D"mailto:fot-bounces@autox.team.net"; =
target=3D"_blank">mailto:fot-bounces@autox.<wbr>team.net</a>] On Behalf Of =
Stephen Borowski<br>Sent: Friday, September 23, 2016 6:45 PM<br>To: FOT Tri=
umph <<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank">fot@autox.=
team.net</a>><br>Subject: [Fot] TR4 Compression Ratio Calculation Questi=
on<br><br>Hello All,<br>Does any one know the "chamber volumes" v=
s "compression ratio=E2=80=9D for the TR4 high port head. What should =
the head thickness measure?<br><br>All comments welcome!<br><br>Thxs. Steve=
<br>______________________________<wbr>_________________<br><a href=3D"mail=
to:fot@autox.team.net" target=3D"_blank">fot@autox.team.net</a><br><br><a h=
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_______________________________________________
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Archive: http://www.team.net/archive
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