Here we go again.... LT1 hydraulic roller cam and RR/Valve adjustment....
09-02-2007, 01:03 AM
#1
Here we go again.... LT1 hydraulic roller cam and RR/Valve adjustment.... Alright .......... I just got into it with one of my older hotrod buddys while I was building my motor and he was watching me do my valve adjustment on my engine. He is kinda old school growing up with 69 camaros and hemi's and all. So I kinda trust his judgement... To a point. I have the hydraulic roller LE4 cam and as most people know that the lifters really are not primed before your initial startup. I just soaked the lifters in oil for a couple of hours. I proceeded to adjust the RR's to set the preload... tighten up the RR's untill you feel the pushrod stop spinning and then go down half a turn. He wanted me to bottom out the lifter and then back off half a turn....? this started up a huge debate between me and him and I really did not agree with him on this.
I went on ahead and did it my way and the motor runs great, but has anyone else ever heard of this being done on a hydraulic roller cam? Has anyone ever tried it that way and what were the effects?
I went on ahead and did it my way and the motor runs great, but has anyone else ever heard of this being done on a hydraulic roller cam? Has anyone ever tried it that way and what were the effects?
09-02-2007, 01:10 AM
#2
If you did it to where the lifter stopped spinning + 1/2 turn your lifters will have way too much preload on them. You should be able to feel 0 lash by just tightning the poly locks by hand and feel when they start having the slightest amount of resistence.
09-02-2007, 03:56 PM
#6
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Originally Posted by ZEX-Z
Alright .......... I just got into it with one of my older hotrod buddys while I was building my motor and he was watching me do my valve adjustment on my engine. He is kinda old school growing up with 69 camaros and hemi's and all. So I kinda trust his judgement... To a point. I have the hydraulic roller LE4 cam and as most people know that the lifters really are not primed before your initial startup. I just soaked the lifters in oil for a couple of hours. I proceeded to adjust the RR's to set the preload... tighten up the RR's untill you feel the pushrod stop spinning and then go down half a turn. He wanted me to bottom out the lifter and then back off half a turn....? this started up a huge debate between me and him and I really did not agree with him on this.
I went on ahead and did it my way and the motor runs great, but has anyone else ever heard of this being done on a hydraulic roller cam? Has anyone ever tried it that way and what were the effects?
I went on ahead and did it my way and the motor runs great, but has anyone else ever heard of this being done on a hydraulic roller cam? Has anyone ever tried it that way and what were the effects?
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09-03-2007, 01:23 AM
#8
Well..... i have already adjusted them like they are supposed to be, i was just curious if anyone has ever heard of a fresh motor with the lifters not primed yet,had the RR's adjusted that way before. i still cant see why running the lifter all the way down until the RR puts pressure on the valve and then back off half a turn. I have always adjusted them with the pushrod +half a turn. There was some arguing and i just wanted to tell him that was the wrong way. Im pretty sure the valves would be open or floating if you did it that way.
09-04-2007, 09:50 AM
#11
David Vizard published one time that you should set them just off fully preloaded. In other words, just a few thousands from totally bottomed out. The theory was that this makes them act more like solid lifters.
However, a test was done in one of the magazines a couple years ago indicating the opposite was true. They actually found the most power on the dyno while running a small amount of lash on a hydraulic cam. I do not know the reason for this, but I'm sure it has something to do with the high speed dynamics of the valvetrain.
However, a test was done in one of the magazines a couple years ago indicating the opposite was true. They actually found the most power on the dyno while running a small amount of lash on a hydraulic cam. I do not know the reason for this, but I'm sure it has something to do with the high speed dynamics of the valvetrain.
09-04-2007, 03:01 PM
#14
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i have never heard that either.
typically, tighter on the lifter equals little more power up top, with possible higher rpms.
lighter is just the opposite.
i have always done your way of doing it, for both new engines/or when they are off, but i also do it while its running, just make sure your ready for a little bit of a mess.
aaron
typically, tighter on the lifter equals little more power up top, with possible higher rpms.
lighter is just the opposite.
i have always done your way of doing it, for both new engines/or when they are off, but i also do it while its running, just make sure your ready for a little bit of a mess.
aaron
09-04-2007, 04:46 PM
#15
Originally Posted by ZEX-Z
Alright .......... I just got into it with one of my older hotrod buddys while I was building my motor and he was watching me do my valve adjustment on my engine. He is kinda old school growing up with 69 camaros and hemi's and all. So I kinda trust his judgement... To a point. I have the hydraulic roller LE4 cam and as most people know that the lifters really are not primed before your initial startup. I just soaked the lifters in oil for a couple of hours. I proceeded to adjust the RR's to set the preload... tighten up the RR's untill you feel the pushrod stop spinning and then go down half a turn. He wanted me to bottom out the lifter and then back off half a turn....? this started up a huge debate between me and him and I really did not agree with him on this.
I went on ahead and did it my way and the motor runs great, but has anyone else ever heard of this being done on a hydraulic roller cam? Has anyone ever tried it that way and what were the effects?
I went on ahead and did it my way and the motor runs great, but has anyone else ever heard of this being done on a hydraulic roller cam? Has anyone ever tried it that way and what were the effects?
You are BOTH wrong, just he moreso than you.
The spin the pushrod method will lead to too much preload, speed_demon24 gave you good advise.
09-04-2007, 07:07 PM
#16
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Originally Posted by Bowtie_Aaron
i have never heard that either.
typically, tighter on the lifter equals little more power up top, with possible higher rpms.
lighter is just the opposite.
i have always done your way of doing it, for both new engines/or when they are off, but i also do it while its running, just make sure your ready for a little bit of a mess.
aaron
typically, tighter on the lifter equals little more power up top, with possible higher rpms.
lighter is just the opposite.
i have always done your way of doing it, for both new engines/or when they are off, but i also do it while its running, just make sure your ready for a little bit of a mess.
aaron
09-05-2007, 06:27 PM
#17
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Originally Posted by buffman
I've have been told the opposite. Lighter on the preload is easier on the lifters and generally will allow for a slight more Hp up top.
09-06-2007, 09:43 AM
#18
Originally Posted by speed_demon24
If you did it to where the lifter stopped spinning + 1/2 turn your lifters will have way too much preload on them. You should be able to feel 0 lash by just tightning the poly locks by hand and feel when they start having the slightest amount of resistence.
