Anti-Pump Up Lifter Adjustment ?
Race Director
Joined: Apr 1999
Posts: 11,520
Likes: 13
From: CORVETTE 77 385 C.I. TEXAS
Re: Anti-Pump Up Lifter Adjustment ? (nunus79)
Sounds like you got a new cam. (or changing the lifters back) Expect you know the procedure.
Turn the pushrod & tighten down, when it stops turning, stop. Works for me.
:cool:
[Modified by Ganey, 7:46 PM 9/28/2001]
Turn the pushrod & tighten down, when it stops turning, stop. Works for me.
:cool:
[Modified by Ganey, 7:46 PM 9/28/2001]
Drifting
Joined: Mar 2001
Posts: 1,396
Likes: 7
From: Indiana
Re: Anti-Pump Up Lifter Adjustment ? (nunus79)
Nunus,
These should be set with zero lash(no preload). I had these on my car up until the solid cam swap a few weeks ago. Unfortunately for me, no one told me about the zero lash when I bought them many years ago. I finaly learned this a while back, but the damage was done. This is why my lifters eventually began to bleed down too quickly when warmed up. This was also the reason for my poor performance on the chassis dyno last month. Amazingly, they did manage to last for many years before failing.
Tom
These should be set with zero lash(no preload). I had these on my car up until the solid cam swap a few weeks ago. Unfortunately for me, no one told me about the zero lash when I bought them many years ago. I finaly learned this a while back, but the damage was done. This is why my lifters eventually began to bleed down too quickly when warmed up. This was also the reason for my poor performance on the chassis dyno last month. Amazingly, they did manage to last for many years before failing.
Tom
Thread Starter
Drifting
Joined: Nov 2000
Posts: 1,361
Likes: 0
From: Honolulu Hawaii
Re: Anti-Pump Up Lifter Adjustment ? (Ganey)
Sounds like you got a new cam. (or changing the lifters back) Expect you know the procedure.
Turn the pushrod & tighten down, when it stops turning, stop. Works for me.
:cool:
[Modified by Ganey, 7:46 PM 9/28/2001]
Turn the pushrod & tighten down, when it stops turning, stop. Works for me.
:cool:
[Modified by Ganey, 7:46 PM 9/28/2001]
Nah, I'm getting ready to do some damage on Maurice's valvetrain. :D
I did pickup the Moroso lifter valley baffle, a new Team-G intake, & some longer pushrods. If I can't make the 1.6 rockers work with the longer pushrods, then I might change out the lifters too. I like your new sig. LOL You sure you're running a Comp Cam? :lol: :lol: :lol:
Norris
Thread Starter
Drifting
Joined: Nov 2000
Posts: 1,361
Likes: 0
From: Honolulu Hawaii
Re: Anti-Pump Up Lifter Adjustment ? (tsw71)
Nunus,
These should be set with zero lash(no preload). I had these on my car up until the solid cam swap a few weeks ago. Unfortunately for me, no one told me about the zero lash when I bought them many years ago. I finaly learned this a while back, but the damage was done. This is why my lifters eventually began to bleed down too quickly when warmed up. This was also the reason for my poor performance on the chassis dyno last month. Amazingly, they did manage to last for many years before failing.
Tom
These should be set with zero lash(no preload). I had these on my car up until the solid cam swap a few weeks ago. Unfortunately for me, no one told me about the zero lash when I bought them many years ago. I finaly learned this a while back, but the damage was done. This is why my lifters eventually began to bleed down too quickly when warmed up. This was also the reason for my poor performance on the chassis dyno last month. Amazingly, they did manage to last for many years before failing.
Tom
Good to know that you have experience on this one! I've heard that this type of lifter is super sensitive to adjustment. Is periodic readjustment necessary? BTW, how's the new setup coming along? Keeping you smiling all the time I hope. Thanks for the reply!
Norris
Drifting
Joined: Mar 2001
Posts: 1,396
Likes: 7
From: Indiana
Re: Anti-Pump Up Lifter Adjustment ? (nunus79)
Nunus,
These should be set with zero lash(no preload). I had these on my car up until the solid cam swap a few weeks ago. Unfortunately for me, no one told me about the zero lash when I bought them many years ago. I finaly learned this a while back, but the damage was done. This is why my lifters eventually began to bleed down too quickly when warmed up. This was also the reason for my poor performance on the chassis dyno last month. Amazingly, they did manage to last for many years before failing.
Tom
Tom
Good to know that you have experience on this one! I've heard that this type of lifter is super sensitive to adjustment. Is periodic readjustment necessary? BTW, how's the new setup coming along? Keeping you smiling all the time I hope. Thanks for the reply!
Norris
These should be set with zero lash(no preload). I had these on my car up until the solid cam swap a few weeks ago. Unfortunately for me, no one told me about the zero lash when I bought them many years ago. I finaly learned this a while back, but the damage was done. This is why my lifters eventually began to bleed down too quickly when warmed up. This was also the reason for my poor performance on the chassis dyno last month. Amazingly, they did manage to last for many years before failing.
Tom
Tom
Good to know that you have experience on this one! I've heard that this type of lifter is super sensitive to adjustment. Is periodic readjustment necessary? BTW, how's the new setup coming along? Keeping you smiling all the time I hope. Thanks for the reply!
Norris
Since I did not know about the proper adjustment until earlier this year :bb , I just left them as is (1/2 turn preload). By that time, I figured it was too late to save them, so I went forward with the new cam. I can only guess that they will need periodic re-setting like any soilid cam would, but that depends on the rocker nuts used. I use poly-lock rocker arm nuts on both my Vette and ******. The ****** is also a solid cam motor and I have not had the need to do much adjusting. The lash has stayed very consitant through the years.
Unfortunately, I have not driven the Vette all week. I caught my kids cold and have not felt like driving it in my sick condition. Thank god for the old beater caddy. If I feel light headed and end up taking on a bus or semi, I'll still win :D :yesnod: I'm feeling much better now so I plan to do some hard driving this weekend :D :D I owe Chuck Harmon a ride and I think we'll see if this 650dp can handle 6000 rpm. :yesnod: If that does not work out, I may just have to give that old vintage trans am series 830 carb a try. I have a 750 vac sec , but I just love the feel of manual secondaries too much.
