VIDEO INSIDE - Valvetrain Pros only please, Identifying installed camshaft
VIDEO INSIDE - Valvetrain Pros only please, Identifying installed camshaft Hey guys, I spent a lot of time on this so I really hope someone can use this video to determine simply if this is a stock or aftermarket camshaft.
I used a dial guage from Harbor Freight and had some confusing results measuring the lift on this cam.
Please see this very short video.
Is this enough to determine if this CAM is stock or aftermarket? (It's supposed to be a CheaTR cam).
Also attaching zoomed in pic of the guage at bottom.
First, here's the layout of what I did:
...and here's the video with the results:
Measuring Installed Cam
I still have it all set up, if I need to measure a different way I can.
Pics:
The video shows the pushrod going 238 thousandths "leaked down" on exhaust, is that enough info? Not sure what that means.
Guy who sold me the car said it has a CheaTR cam in it, someone in another post said if I did this I should be able to at least see that it's stock or not, that's all I'm really trying to determine at this point.
That thread:here where I'm trying to decide if the valvesprings need replaced or not. Answer from this thread will apply to decision in other thread.
I used a dial guage from Harbor Freight and had some confusing results measuring the lift on this cam.
Please see this very short video.
Is this enough to determine if this CAM is stock or aftermarket? (It's supposed to be a CheaTR cam).
Also attaching zoomed in pic of the guage at bottom.
First, here's the layout of what I did:
...and here's the video with the results:
Measuring Installed Cam
I still have it all set up, if I need to measure a different way I can.
Pics:
The video shows the pushrod going 238 thousandths "leaked down" on exhaust, is that enough info? Not sure what that means.
Guy who sold me the car said it has a CheaTR cam in it, someone in another post said if I did this I should be able to at least see that it's stock or not, that's all I'm really trying to determine at this point.
That thread:here where I'm trying to decide if the valvesprings need replaced or not. Answer from this thread will apply to decision in other thread.
Last edited by mk3cn4; Aug 5, 2012 at 04:41 PM.
if it was me i would pull the rocker and try to measure off the pr itself. this will take the lifter plunger travel out of the equation. if it is .238 and we assume .100 of lifter travel it would put your lift around .575. no way to really be sure without taking the plunger travel out of the mix
Was this on the exhaust lobe? The lift on the CheaTR exhaust lobe at the valve spring is .575" so that sounds about right.
Id also try it off the valve spring retainer, you should be really close to .575" exh.
"CheaTR" - 214/230 .601/.575 117 LSA.
Id also try it off the valve spring retainer, you should be really close to .575" exh.
"CheaTR" - 214/230 .601/.575 117 LSA.
Last edited by 99Bluz28; Aug 5, 2012 at 05:34 PM.
Thanks !!!
Ok, this is cool. Someone had a good idea, I am going to go ahead and yank a rocker and check the pushrods and see if they are the stock ones, that would be a good indicator as well, and also do the same test above just on the unsprung pushrod.
Once I tell 100% it's a cheatr cam, then I'm back to my other thread (linked in first post) where I need to decide on swapping the springs because these look stock to me.
So, if the lift measurements continue to hold true at .575 showing it's a cheatr cam, and it's a stock pushrod, then I think I am going to assume the springs are stock and just buy springs for this thing to be safe I guess.
So I can shop while I continue to test, what springs do I need here assuming valvetrain is all stock 2002 LS1 (cheapest that are considered safe)? Do I need anything else, like special retainers or seats or whatever?
Thanks guys, I'm trying to learn about this stuff. Just so much to learn.
Once I tell 100% it's a cheatr cam, then I'm back to my other thread (linked in first post) where I need to decide on swapping the springs because these look stock to me.
So, if the lift measurements continue to hold true at .575 showing it's a cheatr cam, and it's a stock pushrod, then I think I am going to assume the springs are stock and just buy springs for this thing to be safe I guess.
So I can shop while I continue to test, what springs do I need here assuming valvetrain is all stock 2002 LS1 (cheapest that are considered safe)? Do I need anything else, like special retainers or seats or whatever?
Thanks guys, I'm trying to learn about this stuff. Just so much to learn.
Last edited by mk3cn4; Aug 5, 2012 at 06:38 PM.
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Cool, those 1218's are cheaper than I thought, I think I'll go with those.
Texas Speed site outright says they work with stock retainers and seats, so I assume that's all I need.
Since I'm an M6, I thought it was good practice to have stock pushrods because you want them to bend in case of an accidental too high downshift.
Now I need to find an in-car compressor I can borrow/rent!!!
I am still going to give the gauge another shot without the rocker before I reassemble to see if I can nail the cam specs with it, will post results here for other searchers.
Any other opinions or advice please chime in!!!
Texas Speed site outright says they work with stock retainers and seats, so I assume that's all I need.
Since I'm an M6, I thought it was good practice to have stock pushrods because you want them to bend in case of an accidental too high downshift.
Now I need to find an in-car compressor I can borrow/rent!!!
I am still going to give the gauge another shot without the rocker before I reassemble to see if I can nail the cam specs with it, will post results here for other searchers.
Any other opinions or advice please chime in!!!
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Thanks.
EDIT: just realized the valve side drops when the valve opens, not sure if I'm going to be able to get the dial to work right there.
Last edited by mk3cn4; Aug 5, 2012 at 07:39 PM.
Thanks!!
EDIT: Got another good tip: I will do it on an intake pushrod, not exhaust, because intake is larger lift (on a cheatr cam) so it'll be even more obvious!
Please keep the tips coming!!!
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From: Turnin' Wrenches Infractions: 005
No you do not want a stock pushrod because it will bend. Quite the opposite, with that cam they will bend, it's just a matter of time. You need aftermarket pushrods.
