Quote:
Originally Posted by MPKind
Jay, an adjustable pushrod set at standard 0.050" increments was used to find the best valve tip pattern. The valve adjustment was set at 0.020" once the new pushrods were installed. Butler/Comp Hi-Torq HFT cam 230/236 was installed with the Rhoads lifters.
. The noise these lifters make is noticeable. I don't mind at lower RPMs, but at cruising speeds, it's annoying. My understanding is that the lifters quiet down when they pump up and don't have time to bleed off as RPM increases. I can't hear any difference in the sound level at 1000 RPM vs. 3000 RPM. Do certain oils do a better job of decreasing the noise? Would increasing the adjustment from 0.020" to 0.030" have any effect on the sound they make at higher RPMs?
What's your method for checking/changing the adjustment once the engine has been running in the car? Do you prefer using a remote starter switch or rotating by hand to get a valve on base circle or a little of both? Just curious how someone with a lot of experience does this.
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We use 10w40 or 15w40 with Rhoads. It sounds like you need to tighten up the lash a lot. Keep in mind there is hot expansion added to the lash once the engine is hot. If it is sounding like the lifters have some action yet and make noise at 3000 it is likely the hot lash is to much. They can do that clear to 4000 if you give them a lot of lash, even can go a little beyond that. I have set the Vmax at .040” before, probably .046” once hot, they were very loud.
That Bulter cam has aggressive profiles, it has Extreme energy profiles on the intake lobes and a less aggressive magnum profiles on the exhaust. Those cam profiles can make a lot of valve terrain noise even with regular lifters. If it was mine I would set them cold and tighten up the lash to .008” with iron heads, and .004” lash on Aluminum heads. Then you would end up with around .010” lash once hot. The biggest gains in performance and vacuum with V series lifters are with tighter lash settings, after the hot lash is much over .010” (maybe even less with that cam) all the Rhoads lifters really do it make more noise.
You are also likely not going to want to run the lash the same on the intakes and exhaust. I would keep tightening the lash up on both valves until your content with the balance of noise, low end vacuum and power. To make the valve terrain quitest, run the exhaust as tight as possible, and if you need more action from the Rhoads with less noise adjust intake lash wider, keeping the exh tight.
For cranking the engine over, I think I have used about all the methods possible, from doing them individually by rotating the crank, using a remote start switch, and even finding top dead center, adjusting 8, then rotating in 180* and adjusting the other 8. We have even set them while the engine was running and just went by the turns from where the plunger was bottomed out. The tighter you set the lash, the more reason to set them individually manually cranking the engine to make sure they totally bleed down.