Quote:
Originally Posted by KingLT1
What was your actual lifter preload cold? I have been following 2110 lifter discussion for years going back over to LS1 tech and I swear the 2110 called for around .050 of preload cold. The 2110r called for around the same preload but has .045 less total travel. Even the Morel drop in 6504/5315 called for around .050 pre load cold. You sure you didn't have the wrong amount of lifter preload ?Excessive valvetrain noise would be a prime indicator of this.
Everyone uses LS7 lifters because they are the most forgiving and have a wider sweet spot. .075-.100. so often times a pushrod that is close is good enough. Where with Johnson's you might need different length pushrods on the intake and exhaust... especially if the heads are ported and had a valve job done.
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So I emailed Johnson and told them I was shooting for 0.035 and they didn't correct me so I guess this is correct preload maybe not though.
So looking back on my notes you may be right, apparently I was shooting for around 0.050 because right now I am using a 7.750 pushrod, which gives me an average of 0.056, 7.725 would have been very close to nominal 0.035 Johnson recommendation though. I looked back on all my receipts and I think I tried pushrod lengths: 7.725, 7.750, and my original TSP 7.800. I sold all of them though and stuck with my 7.750s:
I think I was trying to increase the preload to make it quieter, but got tired of changing back and forth and just settled with the 7.750s. But you may be right maybe I had some other knowledge somewhere that 0.050 worked better than 0.035, either way its been too long ago to remember.
I am still looking for my preload measurements done just by the rocker arm screw finger tight method, then counting screw turns. I think preload measurement is very subjective from person to person and seems like it would also be very subjected to the state of the lifter height. In the case above all of the lifters would have had miles on them from the TSP cam and recently ran in the engine.
I really think I have more measurements I did with screw turns somewhere I just have to find them, but I think both methods were consistent though