Question about the screaming Eagle adjustable pushrods.
Cruiser
Joined: Aug 2015
Posts: 172
Likes: 48
From: Wisconsin
They both have the same installation instructions. Which says 2 1/2 turns which would be .104”.
Fuel Moto recommended I go .140” deep. This is the second set I’ve installed at 3 turns and 2 flats and the valve train has been quiet.
Fuel Moto recommended I go .140” deep. This is the second set I’ve installed at 3 turns and 2 flats and the valve train has been quiet.
Seasoned HDF Member
Joined: Jun 2017
Posts: 5,315
Likes: 4,272
From: Granville New York
theres only one type of screaming eagle pushrod...no such thing as standard or quickie...thats for s&s. What depth should screaming eagle lifters be set at??? I'd say at the deepest part of the garbage can. But to actually answer a question and try to be helpful I've run screaming eagle pushrods on s&s lifters, Larry's machine lifters and woods and set all of them at 3.5 turns and everyone has been completely happy.
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Joined: Mar 2012
Posts: 100,455
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From: Centennial, CO
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Joined: Apr 2017
Posts: 75
Likes: 9
From: Raleigh nc
I’m doing a repair on an existing build and when I took them out , I counted the turns as I was loosening them . They were set at only two turns . This is what was causing the confusion.. I don’t think they were set properly to begin with . At only two turns I’m wondering if the valves were opening completely.. I’m gonna go with what you suggested.. The 2 1/2 is a safe bet and if I’m getting any noise . I’ll just go back and add 5 flats . Thanks guys . you have All been very helpful…
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Joined: Mar 2010
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From: Honah Lee
Most lifter plunger travel is 0.200. There is a slight bleed down thru a cycle of the engine camshaft. Lifters are little hydraulic jacks but they are not strong enough to override valve springs.
Staying in the 0.100 range in on the lifter works. That gives you 0.100 on each side for length expansion difference in cylinder and pushrod differences. The 0.100 is like a mile compared to what the cylinder and pushrod change.
What makes noise sometimes is when you have heavy springs and wild cams that do not have a couple degrees of increase in base circle diameter before the start of the lift to take care of the slight bleed down.
If a little noise bothers you, don't make a full race motor.?
Staying in the 0.100 range in on the lifter works. That gives you 0.100 on each side for length expansion difference in cylinder and pushrod differences. The 0.100 is like a mile compared to what the cylinder and pushrod change.
What makes noise sometimes is when you have heavy springs and wild cams that do not have a couple degrees of increase in base circle diameter before the start of the lift to take care of the slight bleed down.
If a little noise bothers you, don't make a full race motor.?
Last edited by Jackie Paper; Feb 8, 2022 at 06:43 AM.
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