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  #16  
Old Nov 9th, 12, 06:07 AM
cstraub cstraub is offline
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Default Re: Is this normal roller cam wear??

A quarter inch of more arm swallows up heads and plenum with piston speed. Camshaft depending on heads will have to compensate for this. 140# on a non spintron tested solid roller is "ify" in my book.

Low rpm idling is what kills roller lifters. A lifter with pressure fed oiling works very well. The killer is the landing. If the lifter bounces when it comes off the closing ramp that is the killer as it is also bouncing your valve on the seat.
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  #17  
Old Nov 9th, 12, 06:22 AM
dubs68camaro dubs68camaro is offline
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Default Re: Is this normal roller cam wear??

Quote:
Originally Posted by cstraub View Post
A quarter inch of more arm swallows up heads and plenum with piston speed. Camshaft depending on heads will have to compensate for this. 140# on a non spintron tested solid roller is "ify" in my book.
What the heck does this mean??? It's a hydro roller....not solid. Seems like the solids are closer to 250# on the seat.
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  #18  
Old Nov 9th, 12, 09:05 AM
cstraub cstraub is offline
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Default Re: Is this normal roller cam wear??

Your post said under the knife going 496, Correct. 4.250" Stroke swallows up camshaft.

Drop me your email I will send you an interesting test that Crane did back in '06 with Hyd Rollers and seat pressure.
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  #19  
Old Nov 9th, 12, 09:05 AM
cstraub cstraub is offline
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Default Re: Is this normal roller cam wear??

Bend Oregon, you got some nice pushrods and bullets that come out of that town!
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  #20  
Old Nov 9th, 12, 10:02 AM
dubs68camaro dubs68camaro is offline
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Default Re: Is this normal roller cam wear??

True dat! Cubes eat duration! Now your first sentence totally makes sense!

As far as the others.....you must mean Smith Bros and Nosler?? ;o)

bendprostreet@yahoo.com

BTW....these are the 3 cams I am seriously considering. All right in the ballpark of what Mike Lewis thinks would be a good fit.

Lunati 50250 = 242/252 300/310 .595/.612 LSA 110 IC 108
Lunati 50249 = 232/242 290/300 .578/.595 LSA 112 IC 110
Lunati 60212 = 231/239 282/290 .600/.600 LSA 110 IC 106
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  #21  
Old Nov 9th, 12, 10:09 AM
cstraub cstraub is offline
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Default Re: Is this normal roller cam wear??

LSA's are all to wide for a 496 street engine.
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  #22  
Old Nov 9th, 12, 10:13 AM
dubs68camaro dubs68camaro is offline
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Default Re: Is this normal roller cam wear??

Why is 110 too wide?

PS: I just talked to "steve" at Lunati and he seems to know his sheet.

We talked about a fun and nasty cam for the street and doable with a 4 speed and low gears being the 50250 ground on a 108 LSA. He explained the difference from the 110 and it made sense. Safe on the valvetrain and will squeese the band just a bit.

Last edited by dubs68camaro; Nov 9th, 12 at 11:06 AM.
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  #23  
Old Nov 9th, 12, 02:04 PM
cstraub cstraub is offline
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Default Re: Is this normal roller cam wear??

Quote:
Originally Posted by dubs68camaro View Post
Why is 110 too wide?

PS: I just talked to "steve" at Lunati and he seems to know his sheet.

We talked about a fun and nasty cam for the street and doable with a 4 speed and low gears being the 50250 ground on a 108 LSA. He explained the difference from the 110 and it made sense. Safe on the valvetrain and will squeese the band just a bit.
Be my guest and do a Google search on me when it comes to camshafts. Chris Straub
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  #24  
Old Nov 9th, 12, 05:45 PM
dubs68camaro dubs68camaro is offline
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Default Re: Is this normal roller cam wear??

That's what makes this so hard. There are a bunch of experts out there and yet they can sometimes have completely different approaches.

I know I took Harolds advise once and put in what I thought was too big of a cam in a tow application. It flat freaking ripped!!

I also know that guys like Vizard strive for perfection and anything less is not worth doing. To an average guy like me, many of these "less than" senarios would be just fine. At some point you have to log off the forum and start buying parts or the research will cause you to lose your mind!

It appears this is not your first rodeo. Is there something wrong with the above cam? Can you give me a ball park idea of what you think might work? Time is money and I appreciate yours!
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  #25  
Old Nov 10th, 12, 07:26 AM
cstraub cstraub is offline
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Default Re: Is this normal roller cam wear??

I will disagree with you. There aren't a bunch of experts, but that is conversation another day.

Cams are hobby of mine. If I sell one great if I don't thats ok too. I don't keep any in stock. Each cam is a one off designed for what that customer wants out of his mill. There is a member her with a '69 Camaro that was a solid roller 540 that was not enjoyable but made big power. So unenjoyable he parked it for 2 years. He now has a hyd roller in it. The car is a driver, and it it is a .10th quicker than the old motor with a cam that is 20 degrees smaller.

Combination, Combination, Combination
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  #26  
Old Nov 10th, 12, 05:28 PM
Fred Ficarra Fred Ficarra is offline
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Default Re: Is this normal roller cam wear??

Quote:
Originally Posted by cstraub View Post
Bend Oregon, you got some nice pushrods and bullets that come out of that town!
And quickly.
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  #27  
Old Nov 11th, 12, 09:56 PM
dubs68camaro dubs68camaro is offline
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Default Re: Is this normal roller cam wear?? UPDATED

Okay now I have some real concerns. Pulled the cam tonight and didn't like what I saw. There are gouges on some to most of the ramps. The lines are obviously from the edges of the tappets. You can certainly feel them with a fingernail. What scary is this cam came from another big block with about 500 miles on it. When it was installed into the current block, is was about perfect with no wear marks at all. What you are seeing happened in about 20-30 miles. The marks are also staggered like the lifter is rocking. I looked at the lifters themselves and each pair has wear ONLY on the insides. I'm not sure if that's normal or not because of the link bar. When I think about cylinder lines from rings, they are always on the sides of the cylinders because of the rotation of the crank. I would think wear on a roller lifter would be front and back too and not just on the inside. Has me thinking that the lifter bores are shot or out of round and the lifter is rocking in the bore when it hits the ramps. The block had unknown miles on it when I decided to throw the cam in for fun. Even though the block is going to the machine shop and I'm using a new cam, I'd like to get this figured out because I wanted to reuse the lifters. Any guesses on what would cause those lines?? Should those lifter bores be indexed when at the shop?

Also, is there ever a chance of this cam being used again in another block if it was in fact an alignment issue?
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  #28  
Old Nov 12th, 12, 04:14 AM
SIDEWAYS SIDEWAYS is offline
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Default Re: Is this normal roller cam wear??

I had a billet cam that exhibted the same wear patterns after a couple of 1000 miles. As much as I dont like any type of blemish, I think some of this stuff is normal. Old block with possibly misaligned, worn lifter bores and a new cam with stiff springs - you will get strange wear patterns.
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  #29  
Old Nov 12th, 12, 12:10 PM
cstraub cstraub is offline
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Default Re: Is this normal roller cam wear??

The lifters you have are encapsulated which means they have a .700" wheel. Aftermarket performance roller lobes are based on .750" wheel. A .750" wheel lifter has greater load bearing ability than the .700.

The grooves could have been caused by lofting of the lifter and not enough spring pressure.
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  #30  
Old Nov 12th, 12, 12:42 PM
dubs68camaro dubs68camaro is offline
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Default Re: Is this normal roller cam wear??

Is that what you just get dealing with the "mass" cam companies? You buy a "cam kit" and find out that the sheet isn't matched up out of the gate?

Based on what I have seen, the comp 911 spring is just on the verge of being too light, if not completely there. Guarantee you one thing, this guy is done with cast cams!
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