Anyone have issues using comp cam ductile iron adjustable rockers on hydraulic xe274 h cam kit forged piston closed chamber heads being extra noisy
Adjustable rockers on 440
- Thread starter Jc cooper
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Frank Mopar
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They should not me noisy with hydraulic lifters. You have them set too loose?
Comp Cam ductile iron rockers or Crane ductile rockers? I didn't know Comp made iron rockers.
Agree... Comp makes roller rockers but no Ductile Iron... Crane/Isky/Sig Erson & OE Early Max Wedge & Long Ram rockers are where ductile rockers come from..
The only reason I mentioned it was that I and @Glenwood got recent sets that wore at the tips. And since then they have been discontinued.
I bought the xe262 kit. {Stock shaft mount rockers} my lifters are noisy , Ive check push rods, pulled the intake and took a couple lifters apart to look for crud, fillings, none found. the only thing that seemed to help was switching from 15-40 oil to 10 - 30 the thinner oil seemed to help a little, but they still rattle. I just got used to it , couple thousand miles on the set now no problems.
Last set of comp lifters I will buy though.
My XE cam is a little noisier than what I think it should be. I’ve heard a couple of other XE cams that have the same noise. Setting the rockers a little tighter helped quiet them a little. It could be that the faster opening and closing rates of these cams are part of the reason.
wagonman
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I ran Iskys with the 268 Comp and their lifters, noisy Yup. went to stock stamped and still noisy. X2 on never again using Comp lifters. Just got home from a 1700 mile trip and noisy all the way at idle mostly. Could not really hear it at 80 MPH speeds. The Iskys are on the shelf with the smith bros push rods for another iron head project.
Ok guys your right not ductile pro magnums by bad
IQ52
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Not enough information to give you a competent answer.
What part number lifters are you using? What preload are you using. Are these aluminum or iron closed chamber heads.
fratzog lover
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Ducks quack. Dogs bark. Comp XE cam owners do not always have quiet valvetrains.
Glenwood
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Nor does Lunati!
Sweet5ltr
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Just my experience, yes, most camshaft with fast ramp-rates will be noisy due to the lobe design. I ran the XE 285 HL camshaft in my old RB years ago with Crane / Isky ductile iron rockers, it was a sewing machine. Comp uses symmetrical lobes for these grinds, meaning the opening & closing events of the valves occur with a similar intensity. Not great for wear, less than 1,000 street miles and it already had significant wear on the lobes.
The late Harold Brookshire [Ultradyne / Bullet Racing Cams / Lunati Voodoo series] created many of his camshafts with asymmetrical lobes. Meaning, while they do have relatively fast ramp-rates [intensity] like the above, they have a near OEM ramp-rate when the valve actually closes [low wear & low noise]. You don't even hear the valvetrain in my 470" low-deck with a 259/267* @ .050 solid-lifter camshaft with .606" lift.
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wyrmrider
Well-Known Member
like what you are saying
but I'll have to check the comp lobe catalog- I though they showed different MI - Intensities for open and close
great tip
thanks
but I'll have to check the comp lobe catalog- I though they showed different MI - Intensities for open and close
great tip
thanks
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