Comp cams hydraulic roller lifter failure

[moper]

It's unfortunate, but I don't see it as a production part problem. You experienced a failure and that happens especially in 650 miles with racing. Personally I'm not a fan of hydraulic rollers. My feeling is they are a means to no real end because you have to run a heavier spring to control them, but the lifter collapses with too much spring. It's a tight tolerance to maintain in an environment where high rpm shifts are common. Solid rollers have a place in the world because you can run any spring and the lifters are lighter anyway. Hydraulics, unless the engine is a very mild deal, simply are too heavy and unable to deal with real springs. As a "maybe" I would test your valve springs. If they are weak, you may have had harmonics that helped the lifter fail. If you find other lifters with "loose" tie bars that may be the case.

 

[Alchemi]

Cool.

Hydraulic roller (or flat) for sure. This won't be a racing engine, just trying to take advantage of modern technology to make an Imperial engine even more Imperial-like.

I hadn't thought of rocker angle. My understanding is that roller lifters are longer so you need to have custom (shorter) pushrods to make the total combined length the same. Wouldn't that mean the rocker arm sees the same thing no matter what?

Yes on the pushrods, but on the whole Geometry thing, if you have a rocker with a roller tip, it changes the effective pivot point of the tip. Mike at b3 racing engines has a whole write up on his site B3 Racing Engines LLC - Mopar Rocker Arm Geometry Tech
He dose custom correction locators/spacer for the shafts.

The situation could be fixed with some .250 shorter valves, but then you are up for a devil of a time finding a valve spring to work at that installed height - im working on it....

Another good advertisment for KISS - the oldschool crane/isky adjustable rockers (no roller tip) avoid this issue, but AFIK only available in 1.5 ratio

 

[CBODY67]

The rocker arm ratio relates to total valve lift (lobe lift x rocker arm ratio = total valve lift), not pushrod length or assembled lifter/pushrod length combined. If the lift is too great for the available piston crown/valve clearance at max lift, THEN things come unraveled again.

Most factory-style rocker arms are not always at the specified ratio, due to manufacturing issues, regardless of brand. The way to get things "to spec" is to use roller-rockers with roller tips. Everything's machined rather than otherwise, for a more precise rocker arm ratio. No real reason to deviate from the stock ratio, though.

One reason that the cam manufacturers like to sell "a kit" is that that way, THEY know what they sold you and that it's all compatible. If you mix/match brands, neither brand might warranty anything if it should fail -- another consideration.

The people who can tell you what brand might work best and with which parts are the engine builders . . . .competent, trusted, and with many successful racing customers. They'll see more failures and know why they happened, typically. Some cam brands might have complimentary rocker arms that are not so good, sometimes, for example. Or pushrods, etc.

CBODY67

 

[bluefury361]

Comp Cams = Chinese crap. Buyer beware. It's like buying your speed equipment at Wal-Mart.

 

[65Fury440]

Comp products will never be in any of my stuff again.
Had 2 SBC cams wipe multiple lifters in a row, proper zinc, inner springs removed, fired right up etc.
Havent had any problems with any other brands.
I went with a bigger Howards SFT in my Fury with EDM ;ifters, so far so good, got couple thousand not easy miles on it now.

 

[MEV]

I spoke with Hughes engines, they recommended morel hydraulic roller lifters, so that's what I am going to run. Supposedly Made in america and good quality.

 

[70bigblockdodge]

I spoke with Hughes engines, they recommended morel hydraulic roller lifters, so that's what I am going to run. Supposedly Made in america and good quality.

Any chance you can weigh each pair or any combo of to see if there is a big weight difference and curious to know how wight compares to flat hydraulic I have those to weigh.

 

[MEV]

Any chance you can weigh each pair or any combo of to see if there is a big weight difference and curious to know how wight compares to flat hydraulic I have those to weigh.

Just weighed the morels vs the comp cams hydraulic roller lifters

Comp 10 3/4 oz/pair
Morel 11 5/8 oz/pair