A G-3 cam should have over 110 lbs pressure on the seat. With light valves
and other gear, we use 105 on the seat with an F cam, which has more gentle
action than a G-3. We use a rev limit of 6800 RPM. With the "F" cam and 105
on the seat, the valves will "float" at 7200 rpm.
Greg Solow
----- Original Message -----
From: "Tim Murphy" <timmurph@fastbytes.com>
To: "'Kas Kastner'" <kaskas@cox.net>
Cc: <ryan.murphy@fdlco.wi.gov>; <fot@autox.team.net>
Sent: Tuesday, May 08, 2012 2:50 PM
Subject: Re: [Fot] TR4 Valve spring - pressure, assembled height, suppliers
> The cam is a Kastner G3 and the rockers are stock TR4 with 1.55:1 ratio.
> The measured cam lift is 0.342 giving a measured valve lift of 0.480 with
> 0.016 tappet clearance. This gives an actual ratio of 1.45:1, valve lift
> +
> tappet clearance to cam lift. We use a "red line" of 6000 RPM.
>
>
>
> I checked Good Parts but he only lists TR6 parts, at least that I saw.
> Are
> the TR6 and TR4 valve springs, retainers, keepers and spring seats
> interchangeable?
>
>
>
> Thanks,
>
>
>
> Tim and Ryan
>
> 1961 TR4 #317
>
>
>
> From: hotmail_b17abf0a244adefd@live.com
> [mailto:hotmail_b17abf0a244adefd@live.com] On Behalf Of Kas Kastner
> Sent: Tuesday, May 08, 2012 3:54 PM
> To: timmurph@fastbytes.com
> Subject: RE: [Fot] TR4 Valve spring - pressure, assembled height,
> suppliers
>
>
>
> i cannot help you with a parts without a lot of photos which I might not
> recognize anyway, BUT, that is way way to low a seat pressrue. I don'
> know
> your cam, but if it is high lifter from Larry or something like my old G-3
> then you want about 125 pounds on the seat.
>
> Never be beaten by equipment
>
>
>> From: timmurph@fastbytes.com
>> To: fot@autox.team.net
>> Date: Tue, 8 May 2012 13:40:23 -0500
>> CC: ryan.murphy@fdlco.wi.gov
>> Subject: [Fot] TR4 Valve spring - pressure, assembled height, suppliers
>>
>> The machinist doing the work on our cylinder head tells me that we only
> have
>> about 70 pounds of pressure on the seats. He thinks this is pretty low,
>> in
>> his experience with other engines. He also asked if I had the assembled
>> height of the springs, i.e. how much compression when assembled to the
> head.
>> He usually has this spec and shims the spring to obtain the specified
>> height. Lastly, the alloy retainers are pretty beat up and the origin of
>> the springs are unknown and he thinks they look questionable. Who are the
>> suppliers of valve springs, retainers, keepers and spring seat hardened
>> washers for racing purposes?
>>
>>
>>
>> Thanks,
>>
>>
>>
>> Tim and Ryan
>>
>> 1961 TR4 #317
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>>
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