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#1
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Another hyd roller bites the dust
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
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#2
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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.
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12.24/111.6MPH/1.76 60'/28"/3.54:1/SP-TH400/469 R96A/236-244-112LC/1050&TorkerI//3850Lbs//15MPG/89oct Sold 2003: 12.00/112MPH/1.61 60'/26"x3.31:1/10"/469 #48/245-255-110LSA/Q-Jet-Torker/3650Lbs//18MPG 94oct Sold 1994: 11.00/123MPH/1.50 60'/29.5"x4.10:1/10"/469 #48/245-255-110LSA/Dual600s-Wenzler/3250Lbs//94oct |
#3
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Bummer!
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#4
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Looks like the bearings went away?Tom
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#5
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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!
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Triple Black 1971 GTO |
#6
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I haven't inspected the rollers yet. Ill be sure to post pix
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#7
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Could this OF cam be reground down to a Stump Puller?
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#8
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Which brand/version are the lifters?
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#9
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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/ .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#10
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Comp 857's from around 2012. Im thinking they are Morels?
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
The Following User Says Thank You to jonmachota78 For This Useful Post: | ||
#11
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Quote:
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#12
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I think back then they were using Morels as a sub lifter.For sure they are not the Shavers.Tom
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#13
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You have about .030 to play with and you might be able to re grind it to the original cam.
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#14
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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
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#15
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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 |
#16
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Damn - that sucks! Sorry this happened.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#17
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Thanks for the input all, ill try to get you some pix tonight.
Its was running 1.65 HS rockers and remember measuring. 660" lift on the exhaust when i measured for push rods. Im not sure if running that much lift on a street car is a contributing factor to the failure
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#18
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I doubt it plays much of a roll only because we've run that much in street engines for many years, mine being together for 25 years for example, without issue.
I'm running the Johnson lifters. Hard to say, a lot of factors play into these issues. Open pressures at those lifts would be interesting to compare though. |
#19
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Bearings didn't leave. They don't feel real bad honestly. Not quite as smooth as the other side butt.... Im not sure why if it quit rolling and started skidding. No flat spots but you can see fatigue pitting and it spins freely
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
#20
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Pix
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'78 Macho T/A DKM#95, 460cid, SRP pistons, KRE 310 D ports, 3" pypes, Hooker 1 3/4" headers, hydraulic roller, 10" Continental, 3.42 gears 11.5 @117.5mph 3900lbs ([_|_] ##\|/##[_|_]) |
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