ls7 lifter preload
TECH Fanatic
Joined: Aug 2008
Posts: 1,740
Likes: 2
From: Nebraska
Cardo0 lives in his own little world where everything he says is truth and there's nothing that can be done about it. Every thread he enters gets turned the wrong way because spouts off bad info so then an argument starts.
All my life I have been setting Chevy hydraulics at the top, you know just where the push rod tightens and then another 1/4 or 1/2 turn. But I always do it with the engine running. Been preaching this for over 50 years.
Word is the newer Chevy's like to be set the other way. My 95 LT1 is set about 1/4 turn from the top, and I can get 7,200 RPM out of it with a Lunati Voodoo cam, LS7 lifters and Manley springs. But I want those of you who are interested to google "travel limited lifters in '87 up chev oem roller blocks." and variations of that and see what you think. There is more than one discussion on it. I'm not so sure I believe it and am afraid to try
The new way is to set them at the bottom, like .020 or even .010 from the bottom and.... well just google and see.
Word is the newer Chevy's like to be set the other way. My 95 LT1 is set about 1/4 turn from the top, and I can get 7,200 RPM out of it with a Lunati Voodoo cam, LS7 lifters and Manley springs. But I want those of you who are interested to google "travel limited lifters in '87 up chev oem roller blocks." and variations of that and see what you think. There is more than one discussion on it. I'm not so sure I believe it and am afraid to try
The new way is to set them at the bottom, like .020 or even .010 from the bottom and.... well just google and see.it was interesting to read. it seems like someone had an idea to solve a problem that was caused by something else, or it's a problem in such a small narrow mode and type of operation and it's taken out of context.
i can only guess this type of operation where they think air is in the oil is maybe in a type of forced induction alcohol engine where lots of fuel and blowby is put into the oil reducing the oil's capability of releasing air. normal clean engine oil especially when operated over 140F will not entrap air, if it did then you would have air bubbles in your sump which are then picked up by the oil pump. that is never the case. to think any oil in the lifter can be compressed because it contains air bubbles seems borderline absurd, engine oil is routinely used in other applications as a hydraulic fluid and for power transmission- hydrostatic transmissions being one. and the only reason high valve spring pressures (and it's less than 1000 psi which is not high) would ever be able to push oil out of a lifter during valve lift is because the lifter is bad and has either internal wear or wasn't built as intended and is leaking internally... or your engine oil is so hot or as such a low viscosity it's then leaking past the plunger to lifter body within the lifter. a hydraulic lifter is no different than other hydraulic pistons or rams which operate under thousands of psi. all of the reasons to use a lifter in that manner... preload from the bottom... would be corrected by fixing the root cause of the problem which is almost always valve springs and engine oil viscosity/cleanliness.
Banned
Joined: Jan 2013
Posts: 588
Likes: 0
From: Las Vegas
That post is one of the best examples of denial i have seen. It quotes legitimate references and information then distorts them with assumptions. Just a good example of how your feelings can be your greatest barrier to good performance or success.
That link describes the Comp lifter design better than i ever could and it only supports what ive been posting.
BTW are u afraid to put any information in your profile? Maybe your some kind of mechanical expert but we dont know. Even the 93formula slob with a poop mouth has more in his profile than u.
That link describes the Comp lifter design better than i ever could and it only supports what ive been posting.
BTW are u afraid to put any information in your profile? Maybe your some kind of mechanical expert but we dont know. Even the 93formula slob with a poop mouth has more in his profile than u.
Speaking of profiles, I just HAD to look.
Here's what I found: "cardo0 has not made any friends yet"
I'm sorry for you, cardO .........I bet you've been getting that since your 1st grade report card
But I'll give you an E for effort
Here's what I found: "cardo0 has not made any friends yet"
I'm sorry for you, cardO .........I bet you've been getting that since your 1st grade report card
But I'll give you an E for effort
Banned
Joined: Jan 2013
Posts: 588
Likes: 0
From: Las Vegas
Yea I have the 1.7's too. I have the hot cam and the .026 head gaskets with 1.7s.
97formula17, something that maybe a problem here and easily overlooked is the spacing between the spring retainer and the vlv guide boss. With 1.7s u need a min 5.578" clearance for your hot cam but really need more for a safety margin. Maybe 0.060" more, i don't know. To check this u need to hold the vlvs up with air press and remove a vlv sping assy. Then set the spring retainer back on the vlv stem with the vlv locks in and measure the distance from retainer to the guide boss with a calipers.
Smacking the retainers on the guide boss would bend the p-rods and more. But if this has happened already u should see marks on the underside of the retainer when u take it off.
Just another possible source of your problem.
Good luck,
cardo
97formula17, something that maybe a problem here and easily overlooked is the spacing between the spring retainer and the vlv guide boss. With 1.7s u need a min 5.578" clearance for your hot cam but really need more for a safety margin. Maybe 0.060" more, i don't know. To check this u need to hold the vlvs up with air press and remove a vlv sping assy. Then set the spring retainer back on the vlv stem with the vlv locks in and measure the distance from retainer to the guide boss with a calipers.
Smacking the retainers on the guide boss would bend the p-rods and more. But if this has happened already u should see marks on the underside of the retainer when u take it off.
Just another possible source of your problem.
Good luck,
cardo
Banned
Joined: Jan 2013
Posts: 588
Likes: 0
From: Las Vegas
So i look at __nut's profile too and find a wopping 3 friends there. Not too bad for having been here for 7 years.
And a look at leadheads profile has 1 friend in his 9 years here - and its a empty profile troll too.
Whaaa, haa ha ha. Thats really something to criticize someone else with.
Thx clowns, we all needed some humor here,
cardo
And a look at leadheads profile has 1 friend in his 9 years here - and its a empty profile troll too.
Whaaa, haa ha ha. Thats really something to criticize someone else with.
Thx clowns, we all needed some humor here,
cardo
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