ev72 tight points in rotation
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Tourer
Joined: Jul 2012
Posts: 421
Likes: 1
From: louisiana
ev72 tight points in rotation
Installed ev72 cam and have two points in hand rotation of motor at top of no.2 exhaust lobe and top of no.1 intake lobe. All four clearances for valves and springs were perfect. It does not stop, clunk or bind to the point that motor stops. Worse when in reverse motion. Do I fire it up or try with starter first then fire it up. Lobe clearance to cases checked fine. Anyone exprrience anything simular? Pinetop
Road Captain
Joined: Sep 2012
Posts: 675
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From: Massachusetts
any chance that the *worst* points are when you're on 2 cam lobes (IE ex on 1 / intake on 2 or vice versa)
anything else changed? any chances for a mechanical bind anywhere?
ev72 is .560" lift...too much for stock springs and probably too much for stock uncut valve guides (my stock heads had clearance for ~.530", cut .100" off to make room for my .590" lift w6h).
we need more info
as for checking clearances....did you clay the pistons to check for contact? or just rotate by hand? what did you end up with for clearances?
anything else changed? any chances for a mechanical bind anywhere?
ev72 is .560" lift...too much for stock springs and probably too much for stock uncut valve guides (my stock heads had clearance for ~.530", cut .100" off to make room for my .590" lift w6h).
we need more info
as for checking clearances....did you clay the pistons to check for contact? or just rotate by hand? what did you end up with for clearances?
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Tourer
Joined: Jul 2012
Posts: 421
Likes: 1
From: louisiana
valve guides cut already
The gear was pressed on precisely. The seal to bottom of top inner collar measuted .631 or.632 on all. The installed height was 1.84, 1.84, 1.83, and 1.83 for comp cam springs .600 lift with 1.850 installed height. I
was informed by spring manu. that it is better to be a little short than long and since I had plenty excess capacity the installed heights were fine. valve to piston did not go below .12. Valve to valve is at .095 and .098. Whats FRR ?SPANNERS? I am trying to visualize tight spots on each spring and will report back. Could not sleep much because of the issue.
was informed by spring manu. that it is better to be a little short than long and since I had plenty excess capacity the installed heights were fine. valve to piston did not go below .12. Valve to valve is at .095 and .098. Whats FRR ?SPANNERS? I am trying to visualize tight spots on each spring and will report back. Could not sleep much because of the issue.
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Tourer
Joined: Jul 2012
Posts: 421
Likes: 1
From: louisiana
Ffs?
[QUOTE=Pinetop;12814972]The gear was pressed on precisely. The seal to bottom of top inner collar measuted .631 or.632 on all. The installed height was 1.84, 1.84, 1.83, and 1.83 for comp cam springs .600 lift with 1.850 installed height. I
was informed by spring manu. that it is better to be a little short than long and since I had plenty excess capacity the installed heights were fine. valve to piston did not go below .12. Valve to valve is at .095 and .098. Whats FRR ?SPANNERS? I am trying to
visualize tight spots on each spring and will report
back. Could not sleep much because of the issue.[/
QUOTE]
No, tight spots are happening when only one rocker is moving.
was informed by spring manu. that it is better to be a little short than long and since I had plenty excess capacity the installed heights were fine. valve to piston did not go below .12. Valve to valve is at .095 and .098. Whats FRR ?SPANNERS? I am trying to
visualize tight spots on each spring and will report
back. Could not sleep much because of the issue.[/
QUOTE]
No, tight spots are happening when only one rocker is moving.
Club Member
Joined: Apr 2011
Posts: 5,816
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From: SE Louisiana
How about if you pull the pushrods, then hand turn it, that will narrow down if it's cam or lifter block clearance issues, or top end.
Then turn after install of each pushrod.
If it binds only when you get the second pushrod installed on the same cylinder, remove the other to see if it's valve to valve issue.
Do the checks at zero lash.
Then turn after install of each pushrod.
If it binds only when you get the second pushrod installed on the same cylinder, remove the other to see if it's valve to valve issue.
Do the checks at zero lash.
Last edited by Schex; Jun 4, 2014 at 05:41 AM.
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Tourer
Joined: Jul 2012
Posts: 421
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From: louisiana
I followed instructions above on cam gear swap and it had all the looks of a good swap. dead on scribed marks..
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Thread Starter
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Tourer
Joined: Jul 2012
Posts: 421
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From: louisiana
[QUOTE=Schex3x;12815001]How about if you pull the pushrods, then hand turn it, that will narrow down if it's cam or lifter block clearance issues, or top end.
Then turn after install of each pushrod.
If it binds only when you get the second pushrod installed
on the same cylinder,
remove the other to see if it's
valve to valve issue.[/
QUOTE]
turned in before pushrods and between pushrods for each cylinder and tight spots only noticed after pushrods of no.2 installed.
Then turn after install of each pushrod.
If it binds only when you get the second pushrod installed
on the same cylinder,
remove the other to see if it's
valve to valve issue.[/
QUOTE]
turned in before pushrods and between pushrods for each cylinder and tight spots only noticed after pushrods of no.2 installed.
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