Need help. No compression.
Thread Starter
TECH Enthusiast
Joined: Mar 2003
Posts: 618
Likes: 0
From: San Diego
Need help. No compression. This weekend I put a set of AFR 205s on the car, as well as morel hydralic lifters. Got everything back together today, go to fire it up, no compression. Pull the valve covers, the springs are compressed. I'm like, wtf. I was thinking somehow the pushrod might be too long, so I tossed in a set of 7.35s, still no compression. If i turn the motor over with the rocker arms loose (not torqued) there is compression.
I was under the impression I could run stock rockers with the morels, was I wrong?
The parts involved are as follows:
AFR 205s as cast w/ the valvesprings AFR sends out assembled.
7.35 hardened pushrods
stock rockers
Morel hyd roller lifters
220/220 581/581 110lsa lunati grind
Those are the only components that could be involved in the problem, I believe
Any ideas on what I have going wrong?
I was under the impression I could run stock rockers with the morels, was I wrong?
The parts involved are as follows:
AFR 205s as cast w/ the valvesprings AFR sends out assembled.
7.35 hardened pushrods
stock rockers
Morel hyd roller lifters
220/220 581/581 110lsa lunati grind
Those are the only components that could be involved in the problem, I believe
Any ideas on what I have going wrong?
On The Tree
Joined: May 2005
Posts: 132
Likes: 0
From: North Carolina
How much taller are the Morel lifters as compared to stock? If they are "slightly" larger, I would think they would eventually bleed down to acheive zero lash. I think the only thing you can do now is get an adjustable pushrod, find correct valvetrain geometry (do a search, there are very detailed instructions posted elsewhere) then measure the pushrod and order accordingly.
TECH Addict
Joined: Dec 2001
Posts: 2,907
Likes: 1
From: Bergen County, NJ
I just did a quick check and there is no mention of a height difference on the morel lifters. Are you sure you put the pivot support plates under the rockers, I remember stories of folks leaving those out and winding up with a problem like yours.
Thread Starter
TECH Enthusiast
Joined: Mar 2003
Posts: 618
Likes: 0
From: San Diego
I was pretty sure I could use close to stock pushrod length, especially since my heads aren't milled and I'm using MLS gaskets, but apparently things aren't working out. I'm just wondering if I should solve the problem by using a shorter pushrod or by raising the rocker with an adjustable setup and shims.
On The Tree
Joined: May 2005
Posts: 132
Likes: 0
From: North Carolina
If everything is still stock dimensions, then you shouldn't need custom stuff.
Somebody made a good point about the plate that goes under all the rockers. Still there?
How long did you let the engine sit after tightening the rockers? Maybe they just need time to bleed down some? When you install adjustable rockers, they tell you to wait 30 minutes after each 1/4 turn.
With the lobe on the base of the circle, just how much does it compress the spring when you tighten it down?
Somebody made a good point about the plate that goes under all the rockers. Still there?
How long did you let the engine sit after tightening the rockers? Maybe they just need time to bleed down some? When you install adjustable rockers, they tell you to wait 30 minutes after each 1/4 turn.
With the lobe on the base of the circle, just how much does it compress the spring when you tighten it down?
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