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Camshaft twist
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DRR Sportsman
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Going off memory 283 300 @ .050 .824 .810 gross 114 lobe separation. I don’t have the card in front of me but I think those numbers are close.

It’s 5150 or 5160 whatever core comp uses. Everything yields before failure so it ‘could’ be twisted, who knows for sure.
 
Posts: 548 | Location: somewhere between been and never was | Registered: November 03, 2002Reply With QuoteReport This Post
DRR Top Comp
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quote:
Originally posted by I Hate Dragsters:
Going off memory 283 300 @ .050 .824 .810 gross 114 lobe separation. I don’t have the card in front of me but I think those numbers are close.

It’s 5150 or 5160 whatever core comp uses. Everything yields before failure so it ‘could’ be twisted, who knows for sure.


Good eye/nose. Good you caught it.

Experienced.


 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Sportsman
Picture of Busted Knuckles
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Chances a cam would twist and still fit smoothly in the journals is about the same as winning the Powerball Lottery.


Organized people are just too lazy to look for their $h!t.
 
Posts: 481 | Location: Texas USA | Registered: November 09, 2002Reply With QuoteReport This Post
DRR Sportsman
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Do you know this from experience?
 
Posts: 548 | Location: somewhere between been and never was | Registered: November 03, 2002Reply With QuoteReport This Post
DRR Top Comp
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If it's twisted, chances are slim to none it is not bent.

If cam timing checked out on 1 and 6 we know it hasn't twisted in the center. If it is twisted, it's twisted behind the front journal, that's why I keep saying turn it around and stick it in backwards. I could see it possibly clearancing the front cam bearing itself, running bent/twisted.

Bent is bent, whether it's bent .002 or .010.

Chances of it twisting and not being bent are ultra low, like winning the lottery ultra low, Busted Knuckles is right.

Common sense.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Sportsman
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Once i get the engine hoist returned....i'll give some updates.
 
Posts: 548 | Location: somewhere between been and never was | Registered: November 03, 2002Reply With QuoteReport This Post
DRR Pro
Picture of CURTIS REED
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I would bet it could twist and still turn freely in the bearings. We have all seen cam twist using a distributor to trigger timing and the cam still slides in and out. If the cam took a set with that twist why would it have to be bent?

Now would I bet that it is twisted? No I wouldn't but the cam doctor will tell you.



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2018 Div4 Goodguys Hammer award winner
 
Posts: 2882 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post



DRR Top Comp
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For a camshaft to standardize itself 3-4 degrees retarded, it would have to twist a lot more than the camshaft twist which is associated with timing.
 
Posts: 9398 | Location: Madeira Beach Fl. | Registered: June 12, 2018Reply With QuoteReport This Post
DRR Sportsman
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I checked exhaust p to v after verifying that valve timing was @ 126(jumped tooth is 13.33 degrees, plus the mystery 2.67 degrees). I had 0.007" clearance.

When i degreed the cam in after the last repair @ 110, i had 0.130" clearance. Breaking out the calculator that's 0.0077" per degree at the valve. Based on that finding 2.67 degrees is worth ~0.0206" at the valve, with 1.7 rocker ratio. With that math does that show that the cam is retarded ~0.0121" (arc length) @ the lobe? 0.0206"/ by rocker ratio. Does that make sense??
 
Posts: 548 | Location: somewhere between been and never was | Registered: November 03, 2002Reply With QuoteReport This Post
DRR Elite
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all this nonsense about whether it twisted or bent or not is meaningless at this point. Bottom line is the black core is problematic, you need a new cam and want the gold core.



Oh and my black cam core showed evidence it did twist before it broke at idle.

This message has been edited. Last edited by: 1320racer,
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR Sportsman
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quote:
Originally posted by 1320racer:
quote:
y

all this nonsense about whether it twisted or not is meaningless at this point. Bottom-line line is you need a new cam and want the gold core.

Oh and my black cam core showed evidence it did twist before it broke at idle.


Don't disagree with you, I've already spoke with my cam manufacturer of choice. And yes when i last put the engine together I wasn't fond of the 5150/5160 core.

I'm not the type to accept something is f'd up and toss in the scrap heap and go on with my day, i want to know to as much as possible about the failure. The more I know the happier my f'd mind is Big Grin
 
Posts: 548 | Location: somewhere between been and never was | Registered: November 03, 2002Reply With QuoteReport This Post
DRR Elite
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you already know why it failed...black cam core!
 
Posts: 13522 | Location: NJ | Registered: August 20, 2000Reply With QuoteReport This Post
DRR S/Pro
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quote:
Originally posted by 1320racer:
all this nonsense about whether it twisted or bent or not is meaningless at this point. Bottom-line line is the black core is problematic, you need a new cam and want the gold core.



Oh and my black cam core showed evidence it did twist before it broke at idle.


Gold cores, hands down! Don't use the others. And if you are running a decent lobe lift, around .500 and up in a BBC with a standard core cam, I'd consider a tool steel cam.
 
Posts: 2123 | Location: Tewksbury, MA,USA | Registered: November 03, 2000Reply With QuoteReport This Post
DRR Sportsman
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my bad...you're right Roll Eyes
 
Posts: 548 | Location: somewhere between been and never was | Registered: November 03, 2002Reply With QuoteReport This Post



DRR Pro
Picture of CURTIS REED
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quote:
Originally posted by I Hate Dragsters:
I'm not the type to accept something is f'd up and toss in the scrap heap and go on with my day, i want to know to as much as possible about the failure. The more I know the happier my f'd mind is Big Grin


There is nothing wrong with that. The more ya know, the more ya know.



____________________________
2017 and 2018 Osage Casinos Tulsa Raceway Park No-Box Champion

2018 Div4 Goodguys Hammer award winner
 
Posts: 2882 | Location: KIEFER, OK. | Registered: August 17, 2007Reply With QuoteReport This Post
DRR Sportsman
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Once I got the cam out and wasn’t at some goofy angle trying to use a small vee block to see the pin in the car, It was easy to see that the pin is in fact bent. Case closed. Turn this thing into wall art! I appreciate everyone’s help and input.
 
Posts: 548 | Location: somewhere between been and never was | Registered: November 03, 2002Reply With QuoteReport This Post
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