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Lunati timing marks wrong?

 
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Adrnln
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Joined: 02 Oct 2006
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PostPosted: Mon Oct 02, 2006 6:05 pm    Post subject: Lunati timing marks wrong? Reply with quote

First time here, hope to make some new friends.
I am working on a neighbors old chevy 1 ton. New lunati cam, lifters and gears. The problem I'm having is when I align the cam gear at 6 and the crank gear at 12, I am 180 degrees off. All the chevrolets I've ever worked on use this alignment. Is lunati just different or am I doing somethinh wrong.
Just to clarify myself, with this alignment, The #1 piston is not on tdc, when I crank the engine over by hand just before 180 deg. I feel the #1 cylinder pressure up. Are there any chevrolets you guys know of that align the cam gear at 12oclock and the crank at 12 oclock.
Thanks in advance for any help
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af2
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Joined: 01 Sep 2003
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Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Mon Oct 02, 2006 7:41 pm    Post subject: Re: Lunati timing marks wrong? Reply with quote

Adrnln wrote:
First time here, hope to make some new friends.
I am working on a neighbors old chevy 1 ton. New lunati cam, lifters and gears. The problem I'm having is when I align the cam gear at 6 and the crank gear at 12, I am 180 degrees off. All the chevrolets I've ever worked on use this alignment. Is lunati just different or am I doing somethinh wrong.
Just to clarify myself, with this alignment, The #1 piston is not on tdc, when I crank the engine over by hand just before 180 deg. I feel the #1 cylinder pressure up. Are there any chevrolets you guys know of that align the cam gear at 12oclock and the crank at 12 oclock.
Thanks in advance for any help



Should be cam at 12 and crank at 12 at #1 tdc or lined up at #6 tdc.
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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Mon Oct 02, 2006 11:11 pm    Post subject: Re: Lunati timing marks wrong? Reply with quote

af2 wrote:
Adrnln wrote:
First time here, hope to make some new friends.
I am working on a neighbors old chevy 1 ton. New lunati cam, lifters and gears. The problem I'm having is when I align the cam gear at 6 and the crank gear at 12, I am 180 degrees off. All the chevrolets I've ever worked on use this alignment. Is lunati just different or am I doing somethinh wrong.
Just to clarify myself, with this alignment, The #1 piston is not on tdc, when I crank the engine over by hand just before 180 deg. I feel the #1 cylinder pressure up. Are there any chevrolets you guys know of that align the cam gear at 12oclock and the crank at 12 oclock.
Thanks in advance for any help



Should be cam at 12 and crank at 12 at #1 tdc or lined up at #6 tdc.


i think its Fords that are TDC with cam and crank gears "dot to dot".

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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clay
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Joined: 24 Nov 2002
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Location: South Carolina
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1972 Chevrolet Nova

PostPosted: Tue Oct 03, 2006 4:33 am    Post subject: Reply with quote

How do you think you are 180* off? Even if you put the timing marks both at the 12 o'clock postion, if you turn the crank one revolution, then the cam should be at 6 o'clock with the crank back at 12 o'clock due to the 2:1 reduction. Dot to dot should work but I think the dot to dot postion usually puts #1 in the overlap position (exhaust closing / intake opening) and not the compression stroke which may be confusing you. Clay
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
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1933 Willys Coupe

PostPosted: Tue Oct 03, 2006 9:54 am    Post subject: Reply with quote

clay wrote:
How do you think you are 180* off? Even if you put the timing marks both at the 12 o'clock postion, if you turn the crank one revolution, then the cam should be at 6 o'clock with the crank back at 12 o'clock due to the 2:1 reduction. Dot to dot should work but I think the dot to dot postion usually puts #1 in the overlap position (exhaust closing / intake opening) and not the compression stroke which may be confusing you. Clay



Clay, Exactly true which means #6 is tdc on the compression stroke with the marks dot to dot.
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Adrnln
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Joined: 02 Oct 2006
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PostPosted: Tue Oct 03, 2006 4:27 pm    Post subject: Reply with quote

Yes, both valves move almost immediately depending on which way you turn the crank. So, I learned something today, I think. I was under the impression that when you have the #1 cylinder on the compression stroke at TDC that the marks on the cam and crank gear would be at 6 and 12 oclock. So...I am wrong.
You have eased my mind. I spent two days trying to figure what was wrong. I initially just installed the parts and was in the process of running the valves one cylinder at a time when I noticed what I thought was a problem. So I am good to continue the installation.
THANKS, to all who replied to my post, I appreciate your imput.
Allen
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clay
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1972 Chevrolet Nova

PostPosted: Tue Oct 03, 2006 6:53 pm    Post subject: Reply with quote

Glad we could help! Clay
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