1) Looking at buying either BUT can i safely keep my stock valvetrain if the rev-limit is set to 8200rpms?

2) Would i see a good gain at 8200 if chose s2's over s1's on a b16 with i/e/h + s100 tuning? If so, roughly how much?


Modified by caranjo at 11:54 AM 2/17/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by caranjo &raquo;</TD></TR><TR><TD CLASS="quote">1) Looking at buying either BUT can i safely keep my stock valvetrain if the rev-limit is set to 8200rpms?

2) Would i see a good gain at 8200 if chose s2's over s1's on a b16 with i/e/h + s100 tuning? If so, roughly how much?


Modified by caranjo at 11:54 AM 2/17/2005</TD></TR></TABLE>

If you plan to keep the stock valvetrain then I wouldn't spend the money on either cam. The stage 2 is going to benefit from a higher redline. Not to mention the lift on it is a bit much for stock valvetrain. The stage ones are very similar to CTR cams with slight gains over the CTR's. If you wanted to, you could prolly get away with stock valvetrain for the time being, but I would think you will see more gains from raising the limiter slightly. You really should do it the right way and change the valvetrain to begin with.

 

The reason i ask, is that on the dyno graphs i've seen for both cams, the power dies off after 8200. So if i could rev-limit them to 8200, then why should i change the valvetrain. I know people are going to say to do things right but if i can get away with it, if i'm not going to rev higher - just wondering if it's completely safe to do so?


Modified by caranjo at 11:28 PM 2/17/2005

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by caranjo &raquo;</TD></TR><TR><TD CLASS="quote">The reason i ask, is that on the dyno graphs i've seen for both cams, the power dies off after 8200. So if i could rev-limit them to 8200, then why should i change the valvetrain. I know people are going to say to do things right but if i can get away with it, if i'm not going to rev higher - just wondering if it's completely safe to do so?</TD></TR></TABLE>

Changing the valvetrain out would not always be a neccesity based only off of RPM. Remember, things like coil bind can come into play as well. If the lift of the cam exceeds the ability of the spring, you have coil bind. Something to thing about.

Also, the power will die off at different points based on the engine (B16 vs B18c) and other mods on the car. Tuning will also play a role. The power for a B18C will die off sooner then the B16. This is partially due to the r/s ratio of the B16.

 

in that case i'll probably stick to CTR cams and have them tuned to give me as much mid range as possible.

 

On the Skunk2 website, they say you can run the stock valvetrain on S2-1's, but I believe that they mean the stock ITR valvetrain. It sounds like you've got either a B16 or a B18C1. I'd recommend and upgraded valvetrain if you plan on running those cams because, as its been said already, the valvesprings can bind even before you hit red-line if the cams have significantly more amount of lift than the stock cames would.

 

i got skunk2 stage 1 on stock valveltain,with skunk2 chip ecu redlines at 9200, most the time im get off of it at like 8800 but sumtime i hit the limiter but it holds up fine for me, stage 1 is almost like ctr just a lil better i see many people run ctr's with stock valvetrains, but i know its best off swap them out,but hey i just look at it this way if i blow time for k20

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA916DragSter &raquo;</TD></TR><TR><TD CLASS="quote">i got skunk2 stage 1 on stock valveltain,with skunk2 chip ecu redlines at 9200, most the time im get off of it at like 8800 but sumtime i hit the limiter but it holds up fine for me, stage 1 is almost like ctr just a lil better i see many people run ctr's with stock valvetrains, but i know its best off swap them out,but hey i just look at it this way if i blow time for k20 </TD></TR></TABLE>

If you are indeed spinning a stock valvetrain that high then I can gaurantee you that your engine WILL fail eventually. I just took the head off an engine the guy had the limiter at 8,300 and it kissed all the exhaust valves on the pistons. I don't care what anyone says, stock valvetrain that high is NOT smart in any fashion.

 

^ that happend to me 2 times with 00 itr cams with in a week, over rev and had a fuckd up tranny that lock me out of 4th sumtimes and ill end up in 2nd and rev the **** out of it, so yea i know they don't ,and also one of my head had itr spings in them

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA916DragSter &raquo;</TD></TR><TR><TD CLASS="quote">^ that happend to me 2 times with 00 itr cams with in a week, over rev and had a fuckd up tranny that lock me out of 4th sumtimes and ill end up in 2nd and rev the **** out of it, so yea i know they don't ,and also one of my head had itr spings in them </TD></TR></TABLE>

Maybe I am missing something then. If you know the stock valvetrain won't take that kind of abuse... then why do you continue to do it and risk engine damage?

 

lazyness of bring the head to the shop and having my car not running

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by NA916DragSter &raquo;</TD></TR><TR><TD CLASS="quote">lazyness of bring the head to the shop and having my car not running</TD></TR></TABLE>

Well, at least it would only be a few days. If you grenade it, then you have wait for valves, a valvejob, etc and it will cost you more in the long run. But hey, each to his own.