Skull thumper.
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Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
Skull thumper.
Some of you may recall I chased an ignition ghost a few months back and resolved it somewhat by tweeking my timing and changing wires. The sun of a gun is back! The same day I changed my wires i also tightened all my lifters down 1/4 turn in case I had an issue there.
I am seriously woundering if I have a lobe that has been smoked on my cam. I aim to do a compression test here soon and am currious as to what you guys are getting for a stock CR on a carbed 300. My guess would be about 100-120 psi hot.
Also, is a dialindicator opperating off the pushrod an acceptable means of field testing the lobe lift on a camshaft?
Thanks yall.
I am seriously woundering if I have a lobe that has been smoked on my cam. I aim to do a compression test here soon and am currious as to what you guys are getting for a stock CR on a carbed 300. My guess would be about 100-120 psi hot.
Also, is a dialindicator opperating off the pushrod an acceptable means of field testing the lobe lift on a camshaft?
Thanks yall.
Junior User
Joined: Sep 2009
Posts: 96
Likes: 0
From: Laramie Wyoming
As long as you have it mounted securely. One of my classmates (not the sharpest tool in the shed) tried holding the dial indicator by hand while having someone turn the engine over via breaker bar on the harmonic balancer on a GM 2.5 in a Heep... Err, Jeep.
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Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
I didint bother checking the lift. But I set the vales today. I did what my uncle said he used to do with the 300s he had in the fleet.
I simply took them all loose and checked the pushrods for straightness. Then I brought them to a zero lash at TDC. I started the engine and in 1/4 turn increments brought all the jam nuts down to the end of the threads. My hopping vaccum is gone! It used to hop about a full inch and I could never set the initial spark timing without causing a slight miss. I got rid of the vaccum hop, twisted the distributor ever so slightly and pow. The miss is gone.
I also was experiencing a tendency to die at idle when I came off hard acceleration. THis is gone too. She deffenitly has more power now without any money out of my pocket. Though if they loosen again I intend to buy new jam nuts.
I simply took them all loose and checked the pushrods for straightness. Then I brought them to a zero lash at TDC. I started the engine and in 1/4 turn increments brought all the jam nuts down to the end of the threads. My hopping vaccum is gone! It used to hop about a full inch and I could never set the initial spark timing without causing a slight miss. I got rid of the vaccum hop, twisted the distributor ever so slightly and pow. The miss is gone.
I also was experiencing a tendency to die at idle when I came off hard acceleration. THis is gone too. She deffenitly has more power now without any money out of my pocket. Though if they loosen again I intend to buy new jam nuts.
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
Some call the double nuts "jam" nuts...that is why I asked. If they won't hold you might try double nuts.
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Cargo Master
Joined: Sep 2007
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From: Wahpeton ND
Napa sells the real deal. I find it odd that my lifters have to be maxed out with only about 35k on them.
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From: The Vieux Ford, Kansas
The one motor I put together that had this problem I just had screw in studs put in. I think this is the normal fix as my 79 parts truck has screw in studs as well because of studs pulling out according to the previous owner. You can check them by laying a straight edge across them, and if one is high the it won't lay flat across all of them.
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