Thanks to all who responded to my request for information on valve springs
and pressures. I've ordered a set of springs and titanium retainers from
British Frame and Engine. Generally the seat pressure recommended with my
cam is around 105 to 120 lbs. I'll see what we get with the new springs and
shim if necessary. I keep learning more as we go and this machinist/builder
is willing to work with us. He does mostly Ford and Chevy V-8's for racing
but fortunately is willing to work on our "Tractor" motors. With everything
that he has found in the head and crank and rods, and with the new parts I
hope we'll be a little bit quicker!! Now I just have to get all the parts
and get it put together and on the track.
Thanks again, the FOT is fantastic!
Tim
-----Original Message-----
From: fot-bounces@autox.team.net [mailto:fot-bounces@autox.team.net] On
Behalf Of Tim Murphy
Sent: Tuesday, May 08, 2012 4:50 PM
To: 'Kas Kastner'
Cc: ryan.murphy@fdlco.wi.gov; fot@autox.team.net
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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