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One point which should be emphasized, is that the valve head shape and valv=
e depth have a huge impact on chamber volume.
Different style valves will have different shape on top, ie flat vs dished,=
and for any given thickness, a head with new valves & seats will have cons=
iderably less volume than one with valves that have been faced a few times =
and deeper re-cut seats.
To really know what the CR is, the head volume has to be measured.
Glen
=20
=20
=20
-----Original Message-----
From: John Hasty <jhasty@mhc-law.com>
To: Steven Belfer <steve@artwithcars.com>
Cc: FOT Triumph <fot@autox.team.net>
Sent: Sat, Sep 24, 2016 10:43 am
Subject: Re: [Fot] TR4 Compression Ratio Calculation Question
Exactly what we did on our 2stroke motorcycle racers
Sent from my iPhone
> On Sep 24, 2016, at 12:39 AM, "Steven Belfer" <steve@artwithcars.com> wro=
te:
>
> Get Kas' book. There's a helpful section describing how to CC the head us=
ing 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 als=
o 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 ra=
tio you desire. Also when doing a chamber volume test don't forget that th=
e valve head thickness will affect this measurement.
>>
>> There are a good number of web sites out there that will do all these ca=
lculations for you and give you a required chamber volume for the desired c=
ompression 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 whe=
n 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] On Behalf Of Stephen Borow=
ski
>> 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 f=
or 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
>>
>> 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
>>
>>
>>
>> _______________________________________________
>> fot@autox.team.net
>>
>> http://www.fot-racing.com
>>
>> Donate: http://www.team.net/donate.html
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>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/steve@artw=
ithcars.com
>>
>>
> _______________________________________________
> fot@autox.team.net
>
> http://www.fot-racing.com
>
> 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/jhasty@mhc-=
law.com
>
>
CONFIDENTIALITY NOTICE: This electronic mail transmission has been sent by =
a law firm on a legal matter. It may contain information that is confidenti=
al, privileged, proprietary, or otherwise legally exempt from disclosure. I=
f you are not the intended recipient, you are hereby notified that you are =
not authorized to read, print, retain, copy or disseminate this message, an=
y part of it, or any attachments. If you have received this message in erro=
r, please delete this message and any attachments from your system without =
reading the content and notify the sender immediately of the inadvertent tr=
ansmission. There is no intent on the part of the sender to waive any privi=
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unication. Thank you for your cooperation. 11 U.S.C. 528(a)(4) NOTICE. We a=
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_______________________________________________
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http://www.fot-racing.com
Archive: http://www.team.net/archive
m
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<font color=3D'black' size=3D'2' face=3D'Arial, Helvetica, sans-serif'>On<f=
ont size=3D"2">e point which should be emphasized, is that the valve head s=
hape and valve depth have a huge impact on chamber volume.<br>
Different style valves will have different shape on top, ie flat vs dished,=
and for any given thickness, a head with new valves & seats will have =
considerably less volume than one with valves that have been faced a few ti=
mes and deeper re-cut seats.<br>
To really know what the CR is, the head volume has to be measured.<br>
Glen<br>
</font>
<div> <br>
</div>
<div> <br>
</div>
<div> <br>
</div>
<div style=3D"font-family:arial,helvetica;font-size:10pt;color:black">-----=
Original Message-----<br>
From: John Hasty <jhasty@mhc-law.com><br>
To: Steven Belfer <steve@artwithcars.com><br>
Cc: FOT Triumph <fot@autox.team.net><br>
Sent: Sat, Sep 24, 2016 10:43 am<br>
Subject: Re: [Fot] TR4 Compression Ratio Calculation Question<br>
<br>
Exactly what we did on our 2stroke motorcycle racers<br>
<br>
Sent from my iPhone<br>
<br>
> On Sep 24, 2016, at 12:39 AM, "Steven Belfer" <<a removedlink__08f1=
d6e4-00c1-441c-935f-6715920a9188__href=3D"mailto:steve@artwithcars.com";>ste=
ve@artwithcars.com</a>> wrote:<br>
><br>
> 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 w=
ith.<br>
><br>
> ~Steve<br>
><br>
><br>
>> On Sep 23, 2016, at 8:14 PM, Steve Yott <<a removedlink__08f1d6=
e4-00c1-441c-935f-6715920a9188__href=3D"mailto:tr4@wi.rr.com";>tr4@wi.rr.com=
</a>> wrote:<br>
>><br>
>> Steve,<br>
>> In order to calculate the combustion chamber volume desired you ne=
ed also know the bore, stroke, head gasket diameter and thickness, piston t=
o 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 whic=
h you need to calculate the chamber volume you need for the static compress=
ion ratio you desire. Also when doing a chamber volume test don't forget t=
hat the valve head thickness will affect this measurement.<br>
>><br>
>> There are a good number of web sites out there that will do all th=
ese calculations for you and give you a required chamber volume for the des=
ired compression ratio. There are various head castings out there so I wou=
ld not take the thickness into account except for a rough idea.<br>
>><br>
>> This all creates a "static" compression ratio and will not mean mu=
ch 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 calcu=
lating that!<br>
>><br>
>> Steve Yott<br>
>><br>
>><br>
>><br>
>> -----Original Message-----<br>
>> From: Fot [<a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__h=
ref=3D"mailto:fot-bounces@autox.team.net?";>mailto:fot-bounces@autox.team.ne=
t</a>] On Behalf Of Stephen Borowski<br>
>> Sent: Friday, September 23, 2016 6:45 PM<br>
>> To: FOT Triumph <<a removedlink__08f1d6e4-00c1-441c-935f-671592=
0a9188__href=3D"mailto:fot@autox.team.net";>fot@autox.team.net</a>><br>
>> Subject: [Fot] TR4 Compression Ratio Calculation Question<br>
>><br>
>> Hello All,<br>
>> 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>
>><br>
>> All comments welcome!<br>
>><br>
>> Thxs. Steve<br>
>> _______________________________________________<br>
>> <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__href=3D"mail=
to:fot@autox.team.net">fot@autox.team.net</a><br>
>><br>
>> <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__href=3D"http=
://www.fot-racing.com" target=3D"_blank">http://www.fot-racing.com</a><br>
>><br>
>> Donate: <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__href=
=3D"http://www.team.net/donate.html"; target=3D"_blank">http://www.team.net/=
donate.html</a><br>
>> Archive: <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__hre=
f=3D"http://www.team.net/archive"; target=3D"_blank">http://www.team.net/arc=
hive</a><br>
>> Forums: <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__href=
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>> Unsubscribe/Manage: <a removedlink__08f1d6e4-00c1-441c-935f-671592=
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rget=3D"_blank">http://autox.team.net/mailman/options/fot/tr4@wi.rr.com</a>=
<br>
>><br>
>><br>
>><br>
>> _______________________________________________<br>
>> <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__href=3D"mail=
to:fot@autox.team.net">fot@autox.team.net</a><br>
>><br>
>> <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__href=3D"http=
://www.fot-racing.com" target=3D"_blank">http://www.fot-racing.com</a><br>
>><br>
>> Donate: <a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__href=
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e federal Bankruptcy Code.<br>
<br>
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