[Fot] Kastner A7 in 1147 Spitfire Questions

[Barr, Scott]

<< you can get a dynamite cam profile put on that cam at Moon Equipment. You
cannot E-mail them but phone and ask for Bill Jenks >>

Sadly, not any more.  Moon told me recently that they are OUT of the cams
business.  Bill Jenks has retired.  I damaged my A-10-A cam some time ago and
was not able to have them grind a new one for me.

Scott B.

-----Original Message-----
From: fot-bounces at autox.team.net [mailto:fot-bounces at autox.team.net] On Behalf
Of Joe Guinan
Sent: Friday, October 04, 2013 2:06 PM
To: fot at autox.team.net
Subject: [Fot] Kastner A7 in 1147 Spitfire Questions

Friends,

I've finally installed the used Kastner A7 cam in my 1147 race engine and am
having trouble getting it timed correctly. When I set the #2 valve (intake on
#1 Cylinder) to open at 42 degrees, I cannot get the closing number anywhere
close. It's at 60 something on closing. Haven't even checked where the #1
valve starts to open, as this seems so wrong.

Specs I received from FOT Aaron Johnson are below.
 - Inlet opens 42 Inlet Closes 76
 - Exhaust opens 76 Exhaust close 42
 - Duration 293 Lift at valve .410
 - Checking clearance at the camshaft is .013
 - Rocker arm clearance is .020

Information I received from Kas himself is close to the above; "That cam was
done early on but it will work fine. The timing is Inlet 42-71 and the exhaust
is 71-42. The cam has 293 degree duration and .410 lift at the valve. As I
remember the checking clearance is .013" and the running clearance is .020"."

Kas also added, "Just for your information I believe that cam is done on a
factory billet meaning that the base circle is very close to the stock
diameter.  Check to see if it is.  If so, you can get a dynamite cam profile
put on that cam at Moon Equipment. You cannot E-mail them but phone and ask
for Bill Jenks and then tell him you want the A-10-A. This will go onto that
cam fine if it is the factory billet I used for lots of the camshafts. That
was the latest grind (54 - 90 and the gross lift is .517" )and it was terrific
but you do need high compression to deal with it."

Note the difference in closing measurements in the two sets of specs?

I know I have TDC on the crank set correctly. I'm seeing 42 degrees on the
degree wheel when the dial indicator on the top of the pushrod shows the valve
has opened .013 inch. The valve stays open like it should for most of a
rotation but is only at 60 something on the degree wheel when it has closed to
only being open .013 inch.

What am I missing / not understanding?

I already have the head installed, but I'm about ready to pull the cam out and
get a new one, or follow Kas's suggestion to send it out for a regrind.
I am running high compression with "pop-up" pistons. Something about this cam
just doesn't seem right, and adds to my suspicions about running a used cam in
this newly rebuilt engine. Hate to spend the money and time, but if I have to
do it, I might as well do it now.

Thoughts and opinions welcome...


Thanks,

"Jedi"
Joe Guinan
Fremont, NE
_______________________________________________
fot at autox.team.net

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