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Advancing the cam

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djfalcon10
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Posts: 146
Joined: Mon Jul 18, 2011 12:02 am

Advancing the cam

Post #1 by djfalcon10 » Sat Feb 10, 2018 11:34 am

Got my new cam and here is the specs
.567 lift
306 dur
110 lobe center
107 centerline.
Now the company told me to adavance it 3 degrees now i got a cloyes gear set. That has 4 degree adv and retard. But no 3 degree. Now will it hurt my cam and if i adavance it at 4 degrees to get 111. or is there a special key way that will make three degrees. Thank for you help.

pmuller9
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Posts: 3369
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: Advancing the cam

Post #2 by pmuller9 » Sat Feb 10, 2018 12:01 pm

The lobe separation angle is 110*
The intake lobe center needs to be set at 107* ATDC
You will need to use the .050" duration opening and closing points to degree the cam to the correct posisiton.
Those points should be on the cam card.
It is OK is the cam is off 1 degree but chances are the cam will not have the correct offset and will not be exact anyway.
You will find out once you use your degree wheel to do the cam timing.

Can you post a picture of the cam card?
Last edited by pmuller9 on Sat Feb 10, 2018 12:05 pm, edited 1 time in total.

djfalcon10
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Posts: 146
Joined: Mon Jul 18, 2011 12:02 am

Re: Advancing the cam

Post #3 by djfalcon10 » Sat Feb 10, 2018 12:04 pm

Ok. Now i understand what you are trying to tell me. Just need to make sure it at 107. Thank for your help

pmuller9
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Posts: 3369
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: Advancing the cam

Post #4 by pmuller9 » Sat Feb 10, 2018 12:07 pm

what is the .050" duration?

djfalcon10
Registered User
Posts: 146
Joined: Mon Jul 18, 2011 12:02 am

Re: Advancing the cam

Post #5 by djfalcon10 » Sat Feb 10, 2018 1:26 pm

Try to download the cam spec. Wont let me do it. Here what my cam card saids
Intake =open/close 25@.050/59@.050
Exhaust=open/close 65@.050/19@.050
Cl at 107 and 113@.050

pmuller9
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Posts: 3369
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: Advancing the cam

Post #6 by pmuller9 » Sat Feb 10, 2018 2:13 pm

djfalcon10 wrote:Intake =open/close 25@.050/59@.050
Exhaust=open/close 65@.050/19@.050
Cl at 107 and 113@.050

The .050" duration is 264 degrees by those numbers

With a dial indicator on the #1 intake lifter and the crank rotating clockwise only, the reading or lifter lift needs to be .050" at 25 degree BTDC and return to .050" at 59 degrees ABDC.
This will put the half way point at 107* ATDC.

The exhaust lifter will be .050" at 65 degrees BBDC and .050" at 19 degrees ATDC if the cam's LSA is correct at 110*.
Remember that all readings must be taken with the crank being turned clockwise because the cam gear set tooth clearance will give you error if the crank is turned counterclockwise.

Pardon me if you already know all of this but it might benefit someone else reading this thread.

If you can get the cam timing close with the Cloyes gears and still want to have it spot on, then it can be done with a modified offset key on the cam gear.

What size degree wheel do you have?

pmuller9
Registered User
Posts: 3369
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: Advancing the cam

Post #7 by pmuller9 » Fri Feb 23, 2018 11:03 pm

I'm interested in how the cam installation turned out and also how the engine is performing under boost?
Any Updates?

djfalcon10
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Posts: 146
Joined: Mon Jul 18, 2011 12:02 am

Re: Advancing the cam

Post #8 by djfalcon10 » Sun Feb 25, 2018 11:11 pm

Have not got the motor togetter. Going to take the rods, pistons,crank,flywheel and harmonic balancer . to get them balance. It will be awhile before i get it running. But i will let you know.when i get it running

Stonebreaker
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Posts: 24
Joined: Sun Feb 25, 2018 5:09 pm

Re: Advancing the cam

Post #9 by Stonebreaker » Thu Mar 01, 2018 3:48 pm

djfalcon10 wrote:Got my new cam and here is the specs
.567 lift
306 dur
110 lobe center
107 centerline.
Now the company told me to adavance it 3 degrees now i got a cloyes gear set. That has 4 degree adv and retard. But no 3 degree. Now will it hurt my cam and if i adavance it at 4 degrees to get 111. or is there a special key way that will make three degrees. Thank for you help.

So the Cloyes gearset only advances in 4 degree increments? Got a link to the set you bought?

pmuller9
Registered User
Posts: 3369
Joined: Tue Aug 06, 2013 12:33 am
Location: Columbus, Indiana

Re: Advancing the cam

Post #10 by pmuller9 » Thu Mar 01, 2018 10:09 pm

Stonebreaker wrote:So the Cloyes gearset only advances in 4 degree increments? Got a link to the set you bought?

Yes, it will advance or retard 4 degrees using 3 keyways on the crank gear.
There was difficulty getting the Cloyes 8-1014 gear set and some members reported that it was no longer available.
Summit shows a 3/19/2018 shipping date and Jegs site says to call.
https://www.summitracing.com/parts/clo-8-1014

The alternative is to use the Mr Gasket 987G offset key on the cam gear for a +/- 4 degree change.

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