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 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.
>
> 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.
>
> 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] 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 ratioâ?? for the TR4
> high port head. What should the head thickness measure?
>
> All comments welcome!
>
> Thxs. Steve
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