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Re: [Fot] TR4 Compression Ratio Calculation Question

To: "'Stephen Borowski'" <biznzman@pacbell.net>, "'FOT Triumph'" <fot@autox.team.net>
Subject: Re: [Fot] TR4 Compression Ratio Calculation Question
From: "Steve Yott" <tr4@wi.rr.com>
Date: Fri, 23 Sep 2016 22:14:26 -0500
Delivered-to: mharc@autox.team.net
Delivered-to: fot@autox.team.net
References: <D588A5CE-82B2-4904-9D65-E3FDFA85406C@pacbell.net>
Thread-index: AQF6DpJZ/liQinJXCrFhd8YPFxg+YaE4Ay+w
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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