[jonmachota78]

Butt its been a great engine for 16 years and over 40k miles. Built in 2008 with the 274ex flat hyd and upgraded to hyd roller OF cam in 2012. Plenty of dragstrip runs, i can't complain.

It started making an unfamiliar noise, valve train frequency except not a hammering like a colapsed lifter, rather a scuffing/sqweeky noise. Removed the belts and looked for vacuum leaks to no avail. Put a tube in my ear and couldn't pin it down to one side or the other so figured its time to look at the cam. I kinda felt i was on borrowed time.

Jon

[Half-Inch Stud]

Geez. As if Flat HYD is equally reliable at lower parts cost.

If engine builds were a MIL-Spec'd situation on Parts ratings and de-rated use in operation, i wonder what the Can durations, lifts and spring Seat Pressure and Max open Pressures would be. For Flat HYD, Flat Solids, and Roller cam versions.

You know, for 15-year life of daily use. Oh, 10 year and 5-year. Just to see quantitatively, which parameters ratchet down for long life.

[PAUL K]

Bummer!

[tom s]

Looks like the bearings went away?Tom

[NeighborsComplaint]

You should open a cam grinding business ... your "design" eliminates the link plates, lifter roller stays in the groove and the round lobes are easy on the rest of the valvetrain!

[jonmachota78]

Originally Posted by tom s

Looks like the bearings went away?Tom

I haven't inspected the rollers yet. Ill be sure to post pix

[jonmachota78]

Could this OF cam be reground down to a Stump Puller?

[Steve C.]

Could this OF cam be reground down to a Stump Puller?

Possibly.

I had Bullet regrind a damaged solid roller years ago.
At the time it was $157.50 plus freight.

Example.....

"Should not be any issue, if the cam was made correctly to begin with.
We check the part# of the core to find out what the lobes were roughed to before it was heat treated, then we measure the current lobes to see how much material was taken off, and how much heat treat is left for regrinding."

https://www.yellowbullet.com/threads...-a-cam.483571/

.

[jonmachota78]

Originally Posted by Steve C.

Could this OF cam be reground down to a Stump Puller?

Possibly.

I had Bullet regrind a damaged solid roller years ago.
At the time it was $157.50 plus freight.

Example.....

"Should not be any issue, if the cam was made correctly to begin with.
We check the part# of the core to find out what the lobes were roughed to before it was heat treated, then we measure the current lobes to see how much material was taken off, and how much heat treat is left for regrinding."

https://www.yellowbullet.com/threads...-a-cam.483571/

.

Interesting. Especially if someone wanted to buy it 😁

[Dragncar]

Originally Posted by jonmachota78

Could this OF cam be reground down to a Stump Puller?

You have about .030 to play with and you might be able to re grind it to the original cam.

[78w72]

Which brand/version are the lifters?

[jonmachota78]

Originally Posted by 78w72

Which brand/version are the lifters?

Comp 857's from around 2012. Im thinking they are Morels?

[tom s]

I think back then they were using Morels as a sub lifter.For sure they are not the Shavers.Tom

[tom s]

As I recall back then Johnson was supplying Comp their hyd roller lifter.After they went with Shavers and subbed Morels when out.Those could have been Johnsons.Tom

[Formulajones]

Does appear to be a bearing issue and wheel skipping or locked.

Like Tom said hard to nail down a brand as comp had 3 suppliers. I don't remember what year the 857 "S" lifters showed up as well. I think that was a little later.

May be more identifiable when you pull them out and snap a pic

[78w72]

Originally Posted by Formulajones

Like Tom said hard to nail down a brand as comp had 3 suppliers. I don't remember what year the 857 "S" lifters showed up as well. I think that was a little later.

May be more identifiable when you pull them out and snap a pic

I bought my 1st set of comp lifters from dave at SD in 2012, had the engine/car running in 2013.. it ran great but had the notorious hyd roller ticking, dave suggested adding some seafoam to the oil to see if it would clean out any debris from manufacturing but it didnt work.

He replaced the lifters under warranty with the "new" S comp lifters that came out in early to mid 2014, replaced them in late 2014 according to my notes. So these lifters werent the shavers, look like my originals from the pics, either johnson or morel.

Is it possible the lifter wheel wasnt hardened right to cause that damage? Pretty sure the OF cams were billet, thats why they require a poly or brass dist gear. Bearings could be bad too but still roll ok under no load?

[Steve C.]

On the all the copies of SD Performance cam cards I have on hand they have either part # 51-000-9 or # 51-000-11

The last number, both the 9 or 11 indicate 'Steel Billet Roller'.


.

[jonmachota78]

Originally Posted by Steve C.

On the all the copies of SD Performance cam cards I have on hand they have either part # 51-000-9 or # 51-000-11

The last number, both the 9 or 11 indicate 'Steel Billet Roller'.


.

This is OF comp from Dave i think 2012. Im sure i can dig up the paperwork if you think it might make a difference. I remember its billet, i dressed the dist gear and ran a composite on it with no problems.

Im still leaning towards a cam failure not a lifter failure. The other lobes vary in appearance but none of the other have degraded to this level. They are inconsistant for sure

[jonmachota78]

Originally Posted by 78w72

I bought my 1st set of comp lifters from dave at SD in 2012, had the engine/car running in 2013.. it ran great but had the notorious hyd roller ticking, dave suggested adding some seafoam to the oil to see if it would clean out any debris from manufacturing but it didnt work.

He replaced the lifters under warranty with the "new" S comp lifters that came out in early to mid 2014, replaced them in late 2014 according to my notes. So these lifters werent the shavers, look like my originals from the pics, either johnson or morel.

Is it possible the lifter wheel wasnt hardened right to cause that damage? Pretty sure the OF cams were billet, thats why they require a poly or brass dist gear. Bearings could be bad too but still roll ok under no load?

This whole roller set up parts from dave and setup by his specs. Cam lifters spring package cups. Should only be 146lbs on the seat. And i replaced the spring 5 years ago for no reason other than preventative maintenance due to relatively high lift and mileage. Yes to me the roller bearing feel OK spinning it with my fingers

[grivera]

Damn - that sucks! Sorry this happened.