Pushrod length question
Thread Starter
Racer
Joined: Feb 2003
Posts: 316
Likes: 1
From: The Woodlands TX
Pushrod length question
Can someone concur with my thinking that pushrod length is in direct correlation with valvetrain geometry. In other words a pushrod that is +- .15" will not make that much difference in overall geometry.
Thanks....
Eric
Thanks....
Eric
Le Mans Master
Joined: Aug 2000
Posts: 6,362
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From: Brazos TX
Cruise-In IV Veteran
Cruise-In V Veteran
Re: Pushrod length question (SharkintheWoods)
.050" can make a big difference in the relation of where the rocker rides on the valve tip so it is very important to have the correct length pushrods.
Le Mans Master
Joined: Aug 2000
Posts: 6,362
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From: Brazos TX
Cruise-In IV Veteran
Cruise-In V Veteran
Re: Pushrod length question (SharkintheWoods)
Yep, that's the deal. Are you trying to solve a particular problem or are you just theorizing?
Do you know the "marker pen on the valve tip" trick to see the contact pattern?
Do you know the "marker pen on the valve tip" trick to see the contact pattern?
Instructor
Joined: Oct 2003
Posts: 186
Likes: 0
Re: Pushrod length question (SharkintheWoods)
you can get a push rod length guage for $15. comes with a plastic rocker and adjustible pushrod. easy to do. insert rod, install rocker, adjust rod, remove and measure length, order right size rods. Brian
Thread Starter
Racer
Joined: Feb 2003
Posts: 316
Likes: 1
From: The Woodlands TX
Re: Pushrod length question (burners)
Reason I was asking is I have installed Trickflow 23 degree heads and a Trickflow cam on my L48. I had some factory lengh hardened pushrods on the shelf that I installed. Check me if I am wrong since it has been a while (still have not gotten to the running stage) factory length is 7.8" anyway.. I remember some documentation on Trickflow's website (that I can't find for the life of me now) recommending 7.85". Of course in my wisdom.. I said.. i don't need no stinking new pushrods and installed what was on hand. Now I am second guessing myself about the .05".
What was this market test you are referring to??
Thanks...
What was this market test you are referring to??
Thanks...
Instructor
Joined: Oct 2003
Posts: 186
Likes: 0
Re: Pushrod length question (SharkintheWoods)
the marker test is simple. remove the rocker, and cover the valve tip with ink, re-install the rocker and roll the motor over several times. the "wear pattern" will polish the ink off wear the roller contacts the valve. ajusting the push rod length will move the wear area back and forth, the right length will center the wear pattern and extend the life of the valve guides. Brian
Le Mans Master
Joined: Aug 2000
Posts: 6,362
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From: Brazos TX
Cruise-In IV Veteran
Cruise-In V Veteran
Re: Pushrod length question (AKRAY4PLAY)
:iagree: That's the marker test I was reffering to. You are correct that the stock pushrods are 7.8" (actually they are 7.794"). For proper geometry and wear patterns it is important to have the rocker arm centered on the valve tip.
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Race Director
Joined: Mar 2001
Posts: 11,322
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From: Living in the Hartland
Re: Pushrod length question (SharkintheWoods)
Reason I was asking is I have installed Trickflow 23 degree heads and a Trickflow cam on my L48. I had some factory lengh hardened pushrods on the shelf that I installed. Check me if I am wrong since it has been a while (still have not gotten to the running stage) factory length is 7.8" anyway.. I remember some documentation on Trickflow's website (that I can't find for the life of me now) recommending 7.85". Of course in my wisdom.. I said.. i don't need no stinking new pushrods and installed what was on hand. Now I am second guessing myself about the .05".
What was this market test you are referring to??
Thanks...
What was this market test you are referring to??
Thanks...
http://trickflow.com/product/chevycy...ushroddata.asp
[Modified by Fevre, 4:02 PM 2/5/2004]