Generally the best way to identify a cam is by the lobe center, since that
doesn't vary with the starting clearance.
the prolem with measuring at the valve is that you have the multiplication
value of the rocker which will make it hard to get the starting clearance
right and will give you a higer lift. You also have some mechanical slop.
It's fairly easy to use a pushrod to reach the lifter as long as your dial
indicator has a bit of spring strength.
-----Original Message-----
From: owner-fot@autox.team.net
To: WEmery7451@aol.com; mjb@autox.team.net; fot@autox.team.net
Sent: 5/27/2006 7:41 AM
Subject: Re: [FOT] Kastner D cam?
I'm in the process of trying to figure out what cam is in the engine of
the
race car we are restoring by degreeing the cam. I'm using a degree
wheel
with a pointer and have the dial indicator set up on the valve spring
retainer rather than on the push rod or measuring tool. (We are in the
process of making a new head and I only have #1 intake and exhaust
valves
installed.)
Anyone see anything wrong with this approach?
So far I have (at 0.015 valve clearance):
Exhaust 0.463 valve lift, Opens 80 degrees before BDC, Closed 30
degrees
after TDC, 290 degree duration
Intake 0.477 valve lift, Opens 50 degrees Before TDC, Closed 65 degrees
after BDC, 295 degrees duration
Valve overlap 80 degrees
I have to recheck the TDC and then verify these readings. I also want
to
get a reading every 5 degrees and map the profile and if I get ambitious
see
what kind of acceleration I have in the valve train.
This looks to be somewhere between a S-5 and a G-3 cam from Kas's book.
Any
thoughts from the list on this cam and what it is likely to be would be
appreciated.
The valve springs are single coil of slightly larger diameter than
stock
with an inner flat coil. They sit on large washers or shims that sit in
the
head recesses under the springs. I think I should continue to use these
springs as they were probably specified for this cam. I will be
checking
spring rates this weekend and comparing to the stock springs.
Final note: The original head was milled 0.225. We had a burnt valve
which
started the disassembly. some of the guides are worn at least 1/16
inch! I
think a classic case of rocker mis-alignment as described in Kas's book.
I'll be checking that later this weekend also. For these reasons we are
starting over with a stock head and preparing it for the car.
----- Original Message -----
From: <WEmery7451@aol.com>
To: <mjb@autox.team.net>; <fot@autox.team.net>
Sent: Saturday, May 27, 2006 6:57 AM
Subject: Re: [FOT] Kastner D cam?
> In a message dated 5/27/06 12:04:03 AM Pacific Daylight Time,
> mjb@autox.team.net writes:
>
> << I thought I had the specs for the TR3-4 Kastner D cam somewhere,
but I
> can't
> find them. Anyone have them handy? >>
>
> Inlet opens 33 degrees BTDC Inlet closes 71 degrees ABDC
>
> Exhaust opens 71 degrees BBDC Exhaust closes 33 degrees ATDC
>
> Duration is 284 degrees Total lift at the valve is 0.393
inches
>
> Use checking clearance of 0.010" at camshaft (when using a degree
> wheel).
>
> Rocker Arm adjustment is 0.014" hot.
>
>
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