IHADAV8.com - Turbo Buick Tech, and Nonsense
Tech Area => General Buick Tech => Topic started by: Forzfed on June 12 2017, 10:09:27 AM
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Anyone no what pre-load would be best? I've heard anywhere from 0 to .020.
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Found out it should be at zero when hot. So pre-load should be anywhere from 0.020-.025 to start.
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0.005" was what people used with aluminum heads cold...don't know on iron heads, but, I bet Comp would know :)
they were supposed to be zero preload running as I recall but that is different from what you just posted LOL (because they don't change that much cold to hot...just forget that I posted :D
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How bout...just tight enuf so they don't make noise when hot? lololol
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That would work! It would be better if I had valve covers that the tops came off though.
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I agree one thousand percent! I don't know why some one does not offer that style...
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I have mine set at .020 with aluminum heads. Nice and quite but mine are what is labeled as short travel lifters. Are these original comps made by Johnsons lifters but solis as Comp's? Are they standard, reduced or short travel?
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How bout...just tight enuf so they don't make noise when hot? lololol
No kidding. Sometimes oil school (with rockin teenaged tits) are the way to fly.
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I have mine set at .020 with aluminum heads. Nice and quite but mine are what is labeled as short travel lifters. Are these original comps made by Johnsons lifters but solis as Comp's? Are they standard, reduced or short travel?
Comp sells these as their "High Intensity series". I don't know who makes them for Comp, but I doubt it is Morel. Generally they are supposed to be adjusted .002-004" hot which is probably not far from .020" cold on aluminum heads. These are basically "anti-pump up" lifters due to the near zero preload install. When over-revved, and they pump up, the valve will be barely off the seat.
They cost a hundred bucks or so more than the regular comp roller. My gut feeling is that we would not find much difference between the regular and the High Intensity if we took them apart and started measuring.
Remember when we used to install chevy lifters, the factory said tighten one turn from zero but the hot tip was to tighten them a quarter turn from zero for a couple hundred more rpm before float. I suspect the High Intensity refines this to basically a "hair" past zero (.002-004") for another few rpm.
I asked Billy a couple of years ago if he liked them and he said no. I did not ask why but I suspect it was a quality issue more than a theory problem. As he never tries to sell anything, I always respect his opinion
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They cost a hundred bucks or so more than the regular comp roller. My gut feeling is that we would not find much difference between the regular and the High Intensity if we took them apart and started measuring.
I've often wondered if the only difference was an internal snap ring .vs a circlip.
On that boat engine I set the valves 1/8 turn past 'stop clicking'. That caused two of the circlips to come out. When I build this engine in the next week or so I might replace source some internal snap rings for whatever tappets I buy.
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You are probably right, Earl....low pump up lifters have been around for many years. I think Isky made the first ones I ever bought
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not sure if they are similar or?
I just installed a set of TA hyd rollers, and found they have about .070 internal travel,
way more than I thought, and in order to get them quiet, I had to add close to 1/2 turn ,
I'm guessing .020-.030 ? oil pressure is super, 60+ cold, and 40+ hot.
if I wanted more rpm, I'd have used solid rollers,
these were supposed to be Morel lifters,
I wanted quiet vs hi rpm. beside my cam is all done a 5600 , ( nothing like putting a 7000 rpm lifter on a 5000 rpm cam)
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Not sure if this applies but they seem to be having some issues with morrel in big block land.
http://www.v8buick.com/index.php?threads/johnson-roller-lifters.322436/ (http://www.v8buick.com/index.php?threads/johnson-roller-lifters.322436/)
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I'll take my stock rockers, pushrods and cheapass over the counter flat tappet cam over all this any day of the week...and twice on Sundays. I need a drink...
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not sure if they are similar or?
I just installed a set of TA hyd rollers, and found they have about .070 internal travel,
way more than I thought, and in order to get them quiet, I had to add close to 1/2 turn ,
I'm guessing .020-.030 ? oil pressure is super, 60+ cold, and 40+ hot.
if I wanted more rpm, I'd have used solid rollers,
these were supposed to be Morel lifters,
I wanted quiet vs hi rpm. beside my cam is all done a 5600 , ( nothing like putting a 7000 rpm lifter on a 5000 rpm cam)
My cam is rated for 6K but I have seen .2-.3 in the 1/4 difference from going to 6400 rpm from 5800. I guess I'll see when I take it to the track how things go.
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I have the TA rockers & lifters from around 10 years ago & they used to be pretty quiet with Shell 15-40 & excellent Oil pressure but it seems that lately they are louder. I also noticed last weekend I did a quick WOT blast from roughly 60-140 Km in 3rd that took about 2-3 secs. My 210-215 FT cam used to rev to 5950 or 6000 pretty consistently but it hit 6200 this time? My Lifters are the ones that take about 3/4 turn (close to 30 thous) not the 2 thous ones that I think TA called the "R" version back then? Not 100% sure?
I originally cleaned them out really good when brand new so maybe they are getting Dirty? Either that or maybe the pre load has changed but after 10 years who knows so the valve covers need to come off.
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Sounds like the pre-load has to be readjusted. I know hard core racers that set their lifters before every race day.
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Preload does have to be adjusted.
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I'm pretty sure they need a look see so now it's just convincing myself I want to pull the covers. I have gaskets in the shop but lack the motivation. That job is really hard on my back so my buddy Ray might be getting his hands dirty! :player:
I asked Full Throttle about the power band on my 210-215 roller & they said it's making good power from 5500-6500 so the 6200 I saw last time out is fine.