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> wrote:
>
> 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 ratio? for the TR4
>> high port head. What should the head thickness measure?
>>
>> All comments welcome!
>>
>> Thxs. Steve
>> _______________________________________________
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>>
>> _______________________________________________
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>>
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