Roller cam question?
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Roller cam question?

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    Aquacraft Eddie's Avatar
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    Default Roller cam question?

    Hi , i was wondering what a good, not to expensive roller cam would be for a 454, nothing special has 781 heads, airgap intake, 750 double pumper carb. I was looking at either lunati or comp cams marine roller camshaft, has anybody used these? or does anybody have any recommendations? dont want to break the bank, thought i would put a roller because i dont want to mess around with possibly flatt cam lobes due to the no zinc thing in the oil. This is not a race boat, just ski, but maybe someday who knows. I need the springs, lifters etc... any thoughts thanks... ohh also it is a 12 degree casale, with 18 gears i believe...

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    What do you want it to rev? and are you thinking hydraulic or solid ?


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    gn7
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    Quote Originally Posted by Eddie View Post
    Hi , i was wondering what a good, not to expensive roller cam would be for a 454, nothing special has 781 heads, airgap intake, 750 double pumper carb. I was looking at either lunati or comp cams marine roller camshaft, has anybody used these? or does anybody have any recommendations? dont want to break the bank, thought i would put a roller because i dont want to mess around with possibly flatt cam lobes due to the no zinc thing in the oil. This is not a race boat, just ski, but maybe someday who knows. I need the springs, lifters etc... any thoughts thanks... ohh also it is a 12 degree casale, with 18 gears i believe...
    First, there is no such thing as a inexpensive roller. The cams are pretty much the same cost regardless of the grind, regardless of the grinder. Springs are little less for smaller rollers, but still not cheap. Lifters run the price scale, and you get what you pay for.

    If your going with a roller strictly because you THINK there is a lack of ZDDP in the oil, thats a bad reason. First, there are plenty of oils that have more than enough ZDDP in them for a flat tappet, and you should be using those oils regardless of the cam type. The cam is not the only part in the engine that benefits from the ZDDP, just the most obvious.



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    Im just using it as a ski boat, i would like to be able to beat a jet boat once in a while though, as far as rpms, nothing crazy , this is not going to be a high rev motor, maybe 4 grand, i think thats about where it used to top out, or maybe a little less, i cant remember, anyways nothing really high. I know that all the cams are about the same price, but the cam kits are priced different, like gn7 said, depends on lifters etc... I was going to go with a roller because i thought it might last longer than a flat tappet, and yes mostly because of the zddp or lack of in the oil, i thought the roller might be good insurance, also i wouldnt have to be adding additives to the oil at every oil change, that sucks, and im not sure what oil you are talking about, that has enough zinc, because i read that all oils still have some zddp in them but not enough for flat tappet cams, i could be wrong but most of the research iv done pretty much all said the same thing, not enough to protect flat tappet cams, i would appreciate whatever help you guys can give me, hope this helps, i thought for a ski boat you want something like an rv cam? But i would like to have some top end also but you cant have your cake and eat it too i guess???

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    Also i was thinking of a hydraulic roller, forgot to mention that , sorry for the long post...... I have seen alot of people around here that have rounded their cam lobes on flat tappet, but then again not sure if they had the valves adjusted right either? I know that there is alot of other reasons for rounding cam lobes not just the oil, usually valves arent adjusted right....

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    I rebuilt a 351 cleveland a few years ago, like 12, and now i wished i would have used a roller, mainly because of the canted valve design, ohh welllll live and learn, the cleveland is notorious for rounding the cam lobes, i just didnt have the money for the roller back then and i didnt think it was that big of a deal...

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    Quote Originally Posted by Eddie View Post
    Im just using it as a ski boat, i would like to be able to beat a jet boat once in a while though, as far as rpms, nothing crazy , this is not going to be a high rev motor, maybe 4 grand, i think thats about where it used to top out, or maybe a little less, i cant remember, anyways nothing really high. I know that all the cams are about the same price, but the cam kits are priced different, like gn7 said, depends on lifters etc... I was going to go with a roller because i thought it might last longer than a flat tappet, and yes mostly because of the zddp or lack of in the oil, i thought the roller might be good insurance, also i wouldnt have to be adding additives to the oil at every oil change, that sucks, and im not sure what oil you are talking about, that has enough zinc, because i read that all oils still have some zddp in them but not enough for flat tappet cams, i could be wrong but most of the research iv done pretty much all said the same thing, not enough to protect flat tappet cams, i would appreciate whatever help you guys can give me, hope this helps, i thought for a ski boat you want something like an rv cam? But i would like to have some top end also but you cant have your cake and eat it too i guess???
    Only spinning 4K rpm?....Doubtful you will be smoking many jetboats. 18 gears @ 4000 rpm is only 4720 prop shaft rpm. Once a flat tappt cam gets past a successful break-in it will last as long as any other cam.
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    Quote Originally Posted by Eddie View Post
    I rebuilt a 351 cleveland a few years ago, like 12, and now i wished i would have used a roller, mainly because of the canted valve design, ohh welllll live and learn, the cleveland is notorious for rounding the cam lobes, i just didnt have the money for the roller back then and i didnt think it was that big of a deal...
    Canted valves have nothing to do with the need for a roller and Clevelands are no more prone to flatten cams than any other engine.
    Within the heart of every stray lies the singular desire to be loved. "Good grief you're an irritating blowhard...." [Tex 6/16/11]

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    Well i dont remember what the rpm was when the boat was running, that does sound low, last time it was running was in 1986, dont remember exactly, maybe 5 grand or so,what is the normal rpm for a stock big block in a v-drive? Im not sure what it was, sorry. The cleveland had such an extreme canted valve design they would wear the cam lobes down, this was one of the flaws with the motor, they recommed putting a roller in to solve this problem, it can handle the crazy angle, there is alot of articles on this , i will try to post one,

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    heres an article, i dont mean to get off the subject, but if you read down it explains why the cleveland has this tendency to wear the cam down, to much of an extreme angle on the valve trane..
    Last edited by Eddie; 04-22-2012 at 12:43 PM.

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    ok that didnt work the way i wanted it to ,, i suck at computers

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    Quote Originally Posted by Eddie View Post
    ok that didnt work the way i wanted it to ,, i suck at computers
    don't know about that ...but this forum has an "edit" feature...you can edit a post instead of making a new one to correct something.


    I'll look for that article ...never heard of the issue before.

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    sorry for so many posts, its the second paragraph i keep getting kicked off the site..

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