Subject: [Fot] TR4 Compression Ratio Calculation Question

From: Stephen Borowski <[email-masked]>
Date: Fri, 23 Sep 2016 19:45:11 -0400

Hello All,
Does any one know the "chamber volumes" vs "compression ratio” for the TR4 high port head. What should the head thickness measure?

All comments welcome!

Thxs. Steve
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From: fubog1 <[email-masked]>
Date: Sat, 24 Sep 2016 11:11:37 -0400

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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 <[email-masked]>
To: Steven Belfer <[email-masked]>
Cc: FOT Triumph <[email-masked]>
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" <[email-masked]> 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 <[email-masked]> 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:[email-masked]] On Behalf Of Stephen Borow=
ski
>> Sent: Friday, September 23, 2016 6:45 PM
>> To: FOT Triumph <[email-masked]>
>> 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?
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/[email-masked].=
com
>> Unsubscribe/Manage: http://autox.team.net/mailman/options/fot/steve@artw=
ithcars.com
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law.com
CONFIDENTIALITY NOTICE: This electronic mail transmission has been sent by =
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e federal Bankruptcy Code.

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 &amp; 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 &lt;[email-masked]&gt;<br>

To: Steven Belfer &lt;[email-masked]&gt;<br>

Cc: FOT Triumph &lt;[email-masked]&gt;<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>

&gt; On Sep 24, 2016, at 12:39 AM, "Steven Belfer" &lt;<a removedlink__08f1=
d6e4-00c1-441c-935f-6715920a9188__href=3D"mailto:[email-masked]">ste=
[email-masked]</a>&gt; wrote:<br>

&gt;<br>

&gt; 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>

&gt;<br>

&gt; ~Steve<br>

&gt;<br>

&gt;<br>

&gt;&gt; On Sep 23, 2016, at 8:14 PM, Steve Yott &lt;<a removedlink__08f1d6=
e4-00c1-441c-935f-6715920a9188__href=3D"mailto:[email-masked]">[email-masked]=
</a>&gt; wrote:<br>

&gt;&gt;<br>

&gt;&gt; Steve,<br>

&gt;&gt; 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>

&gt;&gt;<br>

&gt;&gt; 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>

&gt;&gt;<br>

&gt;&gt; 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>

&gt;&gt;<br>

&gt;&gt; Steve Yott<br>

&gt;&gt;<br>

&gt;&gt;<br>

&gt;&gt;<br>

&gt;&gt; -----Original Message-----<br>

&gt;&gt; From: Fot [<a removedlink__08f1d6e4-00c1-441c-935f-6715920a9188__h=
ref=3D"mailto:[email-masked]?">mailto:[email-masked]=
t</a>] On Behalf Of Stephen Borowski<br>

&gt;&gt; Sent: Friday, September 23, 2016 6:45 PM<br>

&gt;&gt; To: FOT Triumph &lt;<a removedlink__08f1d6e4-00c1-441c-935f-671592=
0a9188__href=3D"mailto:[email-masked]">[email-masked]</a>&gt;<br>

&gt;&gt; Subject: [Fot] TR4 Compression Ratio Calculation Question<br>

&gt;&gt;<br>

&gt;&gt; Hello All,<br>

&gt;&gt; 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>

&gt;&gt;<br>

&gt;&gt; All comments welcome!<br>

&gt;&gt;<br>

&gt;&gt; Thxs. Steve<br>

&gt;&gt; _______________________________________________<br>

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&gt;&gt;<br>

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