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DadTruck
Turbo EFI
Joined: 17 Sep 2008
Posts: 1100
Location: Indianapolis
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Post subject:
Cam Degree Success ( finally)
(Sun Mar 11, 2012 1:23 pm)
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Today's project included degreeing the cam on the 83 motor,
messed with it for about an hour, absolutely nothing was making sense,
then i figured out the #1 lifter was an exhaust, not an intake..
big dummy me!
once that was resolved, for cam degreeing this article is about as good as anything else on the internet http://www.slantsix.org/forum/viewtopic.php?t=45885&highlight=degree+cam
thanks Kielbasa. Josh and CNC-Dude,, your questions - answers was much help in filling in the blanks.
For the cam for the 83 D-150,, Oregon1333/1527 regrind over the stock cam. per the Oregon Cam Card it is a 105 LSA, 105 Intake CL and 105 Ex Cl
I installed it using a 2 degree nickel colored Mopar bushing,so my installed numbers are:105 LSA, 103.5 Intake CL and 106 Ex Cl
my event numbers are
at .050
IVO 3 BTDC
IVC 31 ABDC
EVO 29 BBDC
EVC 3 BTDC
per Oregon, the way they ground it...
at .050
IVO 1 BTDC
IVC 31 ABDC
EVO 28 BBDC
EVC -2 ATDC
that is close enough for rock and roll,,
however also checked the cam lift with a dial indicator..
actual intake lift , .299 x 1.5 = .448, Oregon stated .477 on the Cam Card
actual exhaust lift , .284 x 1.5 = .426, Oregon stated .432 on the Cam Card
minus 6 % on the intake
minus 1.5 % on the exhaust
I'll be talking to Oregon Cam on the Intake lift numbers,, above 5% error is more than I expect to see..this is base circle - peak,, we should be able to measure within better than .030....
Regards
DT
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kielbasa
Turbo Slant 6
Joined: 09 Dec 2010
Posts: 535
Location: Orange County
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Post subject:
(Sun Mar 11, 2012 7:54 pm)
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your welcome, that was a fun night trying to get everything setup hahaha... on my motor i ended up with like 2.5 degrees advanced? no shim needed
for the lift numbers, did you do your measuring dry? the oil/moly grease can add quite a bit extra lift with no spring pressure
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CNC-Dude
Turbo Slant 6
Joined: 20 Feb 2010
Posts: 565
Location: N. Ga.
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Post subject:
(Sun Mar 11, 2012 8:29 pm)
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| Your welcome Dad, glad to have been a help.
_________________
There's no such thing as too much cam....only not enough engine!
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akbmotorsports
EFI Slant 6
Joined: 26 Apr 2009
Posts: 305
Location: indiana
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Post subject:
(Mon Mar 12, 2012 1:31 pm)
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| nice work young man!!!
_________________
84 D100 /6 long rod 225
86 D100 /6 my sons w/offy intake/weber carb
95 Buick Park Avenue Ultra
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DadTruck
Turbo EFI
Joined: 17 Sep 2008
Posts: 1100
Location: Indianapolis
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Post subject:
(Mon Mar 12, 2012 2:42 pm)
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Kielbasa,, I had a film of light oil on the #1 cly cam lobes, I did have assembly lube on the cam bearings,,,
I should have put the cam lube on all of the other lobes..but didn't
So now it is either, trying to reach in with a long handle brush or pulling the cam back out to grease it up and re time it,,,,, I believe I am up for the long handle brush method...
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DadTruck
Turbo EFI
Joined: 17 Sep 2008
Posts: 1100
Location: Indianapolis
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Post subject:
(Tue Mar 13, 2012 6:07 pm)
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the question of the intake lift that Oregon ground into the cam is resolved.
on the Cam Card Oregon wrote intake lift of .477 with 1.5 ratio,, that is a typo. What they should have put on the card is .447 with 1.5 ratio,,, that calculates back to a lob lift of .298,, I checked the lift at .299
its all good!
although I am thinking of installing the 4 degree bushing to advance the intake center closer to 100,, would never be easier than now,,,
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slantzilla
Board Sponsor & Moderator
Joined: 17 Oct 2002
Posts: 9349
Location: Park Forest, Illinoisy
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Post subject:
(Tue Mar 13, 2012 6:23 pm)
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Be very careful trying to lube the lobes in block. Cam lube in the lifter bores can keep the lifters from rotating during break-in and wipe a lobe. 
_________________
Proud supporter of Mike Jeffrey Racing Engines since 1999.
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DadTruck
Turbo EFI
Joined: 17 Sep 2008
Posts: 1100
Location: Indianapolis
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Post subject:
(Tue Mar 13, 2012 6:30 pm)
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| Quote: | | Cam lube in the lifter bores can keep the lifters from rotating during break-in and wipe a lobe |
so what is recommended?
to lube all the lobes but #1 cly, then degree the cam, then carefully lube the #1 lob
or
pull the cam after degreeing and just be careful to get it back in the same place
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kielbasa
Turbo Slant 6
Joined: 09 Dec 2010
Posts: 535
Location: Orange County
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Post subject:
(Tue Mar 13, 2012 6:58 pm)
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what i do on any motor i build, is use moly grease/lube, or basicly ARP bolt lube. a little arp packet will do a slant 6 cam.
i cake the moly on all the lobes thick, then for cam bearing and lifters, i use the moly lube, then oil on top of that.
the mixture of moly and oil, is VERY slippery works great
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slantzilla
Board Sponsor & Moderator
Joined: 17 Oct 2002
Posts: 9349
Location: Park Forest, Illinoisy
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Post subject:
(Tue Mar 13, 2012 7:53 pm)
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| John, is the pan on? You should be able to go through the bottom and keep away from the lifter bores.
_________________
Proud supporter of Mike Jeffrey Racing Engines since 1999.
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DadTruck
Turbo EFI
Joined: 17 Sep 2008
Posts: 1100
Location: Indianapolis
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Post subject:
(Wed Mar 14, 2012 6:24 am)
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thanks,
yes I plan to use moly cam lube and the pan is off..
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slantzilla
Board Sponsor & Moderator
Joined: 17 Oct 2002
Posts: 9349
Location: Park Forest, Illinoisy
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Post subject:
(Wed Mar 14, 2012 3:48 pm)
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Piece of cake. 
_________________
Proud supporter of Mike Jeffrey Racing Engines since 1999.
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DadTruck
Turbo EFI
Joined: 17 Sep 2008
Posts: 1100
Location: Indianapolis
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Post subject:
(Thu Mar 15, 2012 4:10 pm)
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ok,, figured this cam degree proposition will never be easier to optimize than now... so
took out the 2 degree nickel colored bushing and put in the 4 degree copper colored bushing, got the following
105 LSA, 100.5 Intake Centerline
at .050
IVO 6 BTDC
IVC 27 ABDC
EVO 32 BBDC
EVC 5 BTDC
during various searches,,,kept seeing that 100 to 102 is a good Intake Centerline Angle for torque and slants.. From the RB dynamic compression calculator the change from a 104 to a 100 ICA changes the dynamic compression from 8.14 to 8.19,,
we shall see
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