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 Post subject: to cam or not to cam...
PostPosted: Sun Mar 01, 2009 1:02 am 
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I was wondering, how much extra strain does this put on the rest of the valvetrain. I am debating between rockers and a cam. I was wondering this difference in gains and labor involved between the two. Also the difference price as well.

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PostPosted: Sun Mar 01, 2009 2:30 am 
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any idea what cam and what rockers you're lookin at?

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PostPosted: Sun Mar 01, 2009 4:21 am 
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not really, I daily drive this thing and am not trying to go to the extreme with it as far as performance to be honest. I am open to suggestions. I kinda was wondering what people were recomending or not.

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PostPosted: Sun Mar 01, 2009 4:35 am 
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These are FI cars, the cams won't be extreme really. You don't want overlap, will just push all that air your forcing in the chamber right out the exhaust valve. The S1X I have in my car is fantastic. Gives it a nice little burble to the exhaust note, real mean sounding. But the idle isn't too loppy.

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PostPosted: Sun Mar 01, 2009 12:06 pm 
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How about the install? I have cammed my hot rod but it is rwd and carbed and used to have open headers, it idled like a freakin monster. I havent cammed a fwd car before. How involved is it exactly? Would rockers be a better move? Or would they put too much strain on the rest of my 145k mile valvetrain? Or would I be happier with a ssic?

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PostPosted: Sun Mar 01, 2009 12:24 pm 
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mike p. wrote:
How about the install? I have cammed my hot rod but it is rwd and carbed and used to have open headers, it idled like a freakin monster. I havent cammed a fwd car before. How involved is it exactly? Would rockers be a better move? Or would they put too much strain on the rest of my 145k mile valvetrain? Or would I be happier with a ssic?



I am running a PRJ LL cam I have 160,xxx miles on my car its very valvetrain friendly

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PostPosted: Sun Mar 01, 2009 12:30 pm 
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Really? Because that is probably the biggest concern of mine when it comes to valvetrain upgrades. I was thinkin if do rockers then I am gonna have to do springs. If I do springs I should probably replace the chain and tensioner. And if I am getting that into it might as well cam it... I am just debating what Iwould be better off doing.

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PostPosted: Sun Mar 01, 2009 12:33 pm 
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mike p. wrote:
Really? Because that is probably the biggest concern of mine when it comes to valvetrain upgrades. I was thinkin if do rockers then I am gonna have to do springs. If I do springs I should probably replace the chain and tensioner. And if I am getting that into it might as well cam it... I am just debating what Iwould be better off doing.


The cam I have I am running 105# springs and a double roller by my choice I think Ryan (indy99gtgp) is running a stock chain setup I think you will have to do spring on both cam or rockers

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PostPosted: Sun Mar 01, 2009 12:56 pm 
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Rockers are the easiest to do but a cam is the best gain. You don't have to take the motor out to do a cam. You go through the passenger fender well to change it. I run a an XP cam and love it. it lopes but not heavy.

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PostPosted: Sun Mar 01, 2009 2:54 pm 
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If I do rockers then I would have to do springs, if I do springs do I need to do the chain and tensioner? If so, then how much more work would it be just putting in a cam?

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PostPosted: Sun Mar 01, 2009 3:01 pm 
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mike p. wrote:
If I do rockers then I would have to do springs, if I do springs do I need to do the chain and tensioner? If so, then how much more work would it be just putting in a cam?


It depends on what rockers you get. If you get the 1.84 roller rockers, you don't have to change the springs. 1.9's, you should change the springs.

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PostPosted: Sun Mar 01, 2009 6:49 pm 
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What are the differences in gains between 1.9 and 1.84?

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PostPosted: Mon Mar 02, 2009 9:36 am 
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Its a higher lift of the valves. Lets more air in, lets more exhaust gas out. Here is a good article on rocker arms;
http://www.boyleworks.com/ta400/psp/RockerArms.html

It is possible to run 1.9 rockers on stock springs. It all depends on what you have your shift points set at. Also, if you have a higher mileage engine it is not recommended because failure could occur easier.

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PostPosted: Thu Mar 05, 2009 11:59 pm 
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I have 1.9 rockers with stock springs, and I run fine. No valvetrain problems what-so-ever.

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PostPosted: Fri Mar 06, 2009 10:32 pm 
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What are your shift points though?

What is likely to fail? The chain? Or is it the tensioner?

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Last edited by mike p. on Fri Mar 06, 2009 10:38 pm, edited 1 time in total.
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PostPosted: Tue Mar 10, 2009 1:53 pm 
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Quote:
What are your shift points though?

What is likely to fail? The chain? Or is it the tensioner?


WEll it could be a number of things. With stock springs and high shift points, you start getting valve float. Which can cause a major loss of power at the top end. If the valves float enough, you could potentially have the pistons tapping the valve. This would be rare but i could see it happeneing. If you upgrade springs, a new tensioner is a must but is very easy to replace. I though the whole cam installation was simple really but you just have to take your time. While u are in there, check the timing chain for play. Usually if the chain has over 75,000 miles, it is always a good idea to replace the timing set before valve train upgrades. This could be the other point that could fail. The added force on the timing chain will show as added wear on the tensioner which will need to be replaced more often. If a streched chain is not replaced, it could break/jump teeth and then you have to do what i just got done doing and replace your entire engine.

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PostPosted: Thu Mar 12, 2009 5:40 pm 
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well I did the rockers and well I am going cam now need i say more

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PostPosted: Fri Mar 13, 2009 12:36 am 
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I went with rockers and then cam a year later, there is no comparison performance wise. If I were to do it over I would go cam & headers and would of saved some $ in the long run.

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