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Re: [Fot] TR4 Compression Ratio Calculation Question

To: Steve Yott <tr4@wi.rr.com>
Subject: Re: [Fot] TR4 Compression Ratio Calculation Question
From: Steven Belfer <steve@artwithcars.com>
Date: Fri, 23 Sep 2016 21:19:46 -0700
Cc: FOT Triumph <fot@autox.team.net>
Delivered-to: mharc@autox.team.net
Delivered-to: fot@autox.team.net
References: <D588A5CE-82B2-4904-9D65-E3FDFA85406C@pacbell.net> <000001d21611$c1ff39f0$45fdadd0$@wi.rr.com>
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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