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 Post subject: Cam Degree
PostPosted: Mon Feb 22, 2021 7:57 am 
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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3257
Location: Indianapolis
Car Model:
this was mentioned in a thread

'Doc's method of degreeing the cam by pulling a dowel pin and putting the head on the block off by one cylinder'

could some one explain this method, advantages ...

thanks


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 Post subject: Re: Cam Degree
PostPosted: Mon Feb 22, 2021 10:03 am 
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Turbo Slant 6

Joined: Thu Jun 07, 2012 4:29 pm
Posts: 670
Location: Houston
Car Model: 68 Valiant
I can only assume it's an attempt to use the head as a piston stop...?

Seems like a lot of work if that's what it is.


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 Post subject: Re: Cam Degree
PostPosted: Mon Feb 22, 2021 3:47 pm 
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TBI Slant 6

Joined: Mon May 26, 2014 4:02 pm
Posts: 208
Location: Vermont
Car Model:
DadTruck wrote:
this was mentioned in a thread

'Doc's method of degreeing the cam by pulling a dowel pin and putting the head on the block off by one cylinder'

could some one explain this method, advantages ...

thanks


I can only guess that it is within the context of rebuilding the engine, Dowel pins removed all ready, and one can see what is going on as "visual aid" to the process for those of us who are new to the cam phasing/degree process.


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 Post subject: Re: Cam Degree
PostPosted: Mon Feb 22, 2021 3:50 pm 
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Turbo EFI
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Joined: Wed Oct 12, 2005 9:00 pm
Posts: 1993
Location: kankakee IL
Car Model: 80 volare, 78 fury 2 dr, 85 D150
GregCon wrote:
I can only assume it's an attempt to use the head as a piston stop...?

Seems like a lot of work if that's what it is.

yeah. He mentioned and showed it in his book.


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 Post subject: Re: Cam Degree
PostPosted: Mon Feb 22, 2021 4:45 pm 
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Supercharged

Joined: Wed Sep 17, 2008 6:48 pm
Posts: 3257
Location: Indianapolis
Car Model:
Interesting, I have never degreed a slant with the head on, its a lot easier to just use a piece of flat stock across a bore with a short through bolt as a piston stop.
Balance a pushrod straight up from a lifter against a dial indicator, direct and simple way to get the data point measurements.


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 Post subject: Re: Cam Degree
PostPosted: Tue Feb 23, 2021 4:48 am 
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Board Sponsor & Moderator
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Joined: Mon Oct 21, 2002 11:08 am
Posts: 14715
Location: Blacksburg, VA
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I have always done it with head off, with strip and bolt across the cylinder.

Lou

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 Post subject: Re: Cam Degree
PostPosted: Tue Feb 23, 2021 5:23 am 
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Supercharged
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Joined: Sat Nov 27, 2004 8:03 pm
Posts: 6662
Location: IRWIN PA
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I am the odd ball.

I have never done one with the head off.

I just use the 0.050" method for finding the tdc due to the dwell at perceived tdc.

I also don't have a good way of measuring Lift with the head off.

Greg

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 Post subject: Re: Cam Degree
PostPosted: Tue Feb 23, 2021 11:43 am 
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Turbo Slant 6

Joined: Thu Jun 07, 2012 4:29 pm
Posts: 670
Location: Houston
Car Model: 68 Valiant
I think his method is intended as a low-buck, down and dirty type method for the guy who doesn't have a lot of stuff lying around.

For most guys, having junk lying around the shop is not an issue so it's easier to use a piece of scrap metal with a 2 or 3 holes in it to make a stop.


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 Post subject: Re: Cam Degree
PostPosted: Tue Feb 23, 2021 3:54 pm 
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Board Sponsor & SL6 Racer

Joined: Wed Oct 23, 2002 7:57 pm
Posts: 6821
Location: Waynesboro, Pa.
Car Model: 65 Valiant 2Dr Post
Quote:
I also don't have a good way of measuring Lift with the head off.


I have done it with head off and on. Usually it is on. If it is off I have a small scrap of aluminum angle bolted to one of the head bolt holes. Another hole is directly over the lifter and I drop a push rod into that hole and set my dial indicator up right on top of that. :)

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 Post subject: Re: Cam Degree
PostPosted: Tue Feb 23, 2021 4:25 pm 
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Board Sponsor & Moderator
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Joined: Thu Oct 17, 2002 7:27 pm
Posts: 12800
Location: Park Forest, Illinoisy
Car Model: 68 Valiant
I made a plate that stretches across the #1 hole and overhangs the lifters. It has a hole for a pushrod and provides a mounting spot for the dial indicator. It also has a stop bolt for tdc.

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 Post subject: Re: Cam Degree
PostPosted: Wed Feb 24, 2021 9:09 am 
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6 Pack Dart
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Joined: Sat Nov 02, 2002 5:44 pm
Posts: 2277
Location: Eugene, Oregon
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I JB welded 3 old lifters end to end one at bottom cam side down with top one pushrod side up in a hunk of angle to keep all in alignment. sand off excess JB weld use as a long lifter with head off.

Richard

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 Post subject: Re: Cam Degree
PostPosted: Wed Feb 24, 2021 10:27 am 
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TBI Slant 6

Joined: Thu Apr 18, 2019 7:57 am
Posts: 157
Location: Lawrenceville, GA
Car Model: 1966 Dodge Dart
GregCon wrote:
I think his method is intended as a low-buck, down and dirty type method for the guy who doesn't have a lot of stuff lying around.

For most guys, having junk lying around the shop is not an issue so it's easier to use a piece of scrap metal with a 2 or 3 holes in it to make a stop.


In addition to using the head as an improvised piston stop, he also uses the valve gear to see when the valves have started to move, so you don't need a dial indicator.

This is done with only the #6 piston in place, so the engine still spins freely.

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Matt Cramer
1966 Dodge Dart turbo / EFI project


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