Cam install - help!
Thread Starter
Melting Slicks
Joined: Oct 2007
Posts: 2,464
Likes: 2
From: Cedarburg, WI
Well said... besides, lets say the OP decided to just throw it it because member X said it will be fine. Then after one run down the street, each piston ends up smacking a valve and the motor is toast.
Do you think member X will take responsibility? No, hes just going to say, "oh snap, really?"
Good move on checking PTV, one of the most neglected tasks on a H/C install.
Do you think member X will take responsibility? No, hes just going to say, "oh snap, really?"
Good move on checking PTV, one of the most neglected tasks on a H/C install.
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Thread Starter
Melting Slicks
Joined: Oct 2007
Posts: 2,464
Likes: 2
From: Cedarburg, WI
It is not a problem if you don't go too deep. I think the stock pistons are .220 thick in that area. Have been told you can go up to .100 safely. remember you are just cutting a relief in a smaller area of the total. I would be more concerned if you were running boost or something!
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
The Isky cutter (what I used on mine) looks radically different.
And leaves a cut that looks like this: (the scratches are just from using sandpaper to remove the sharp edge of the cut)
I wish I could have made it over to Verne's this weekend, to see how differently his Lindy cutter worked compared to mine.
Thread Starter
Melting Slicks
Joined: Oct 2007
Posts: 2,464
Likes: 2
From: Cedarburg, WI
The tool did tend to chatter a bit with my setup...slow turning air ratchet. I think that you have to learn to apply even steady pressure.
With more practice and possibly a higher turning speed it could have possibly been better.
Here is one of the cuts cleaned up a bit.
Once they are cleaned up some I am not sure that it will matter at all - any other opinions?
With more practice and possibly a higher turning speed it could have possibly been better.
Here is one of the cuts cleaned up a bit.
Once they are cleaned up some I am not sure that it will matter at all - any other opinions?
Last edited by vsocks1; Apr 27, 2009 at 07:38 PM.
Le Mans Master
Joined: Sep 2003
Posts: 6,276
Likes: 227
From: Farmington CT
Cruise-In VII Veteran
Opinions? Yes, I have personally seen the mod'd LS head Tom used, he has real world experience, don't get confused w/ the waxer 20's 
Nice thread, nice work people!!!!
Nice thread, nice work people!!!!
Drifting
Joined: Jan 2002
Posts: 1,498
Likes: 3
From: Sacramento CA
I have not read through the last 10 or so posts, but I noticed some recomending to use solid lifters to check PTV clearance for a hydrolic setup. This is COMPLETELY wrong. Never use solid lifters to check ptv. There is a certain amount of pre-load stock hydrolic lifters will take, and a solid lifter will not give you an accurate measurement. I am speaking from experience, and almost cost me a motor.
Keep up the good work!!
Keep up the good work!!
Team Owner
Joined: Mar 1999
Posts: 22,025
Likes: 192
From: At the beach in little Rhody
I have not read through the last 10 or so posts, but I noticed some recomending to use solid lifters to check PTV clearance for a hydrolic setup. This is COMPLETELY wrong. Never use solid lifters to check ptv. There is a certain amount of pre-load stock hydrolic lifters will take, and a solid lifter will not give you an accurate measurement. I am speaking from experience, and almost cost me a motor.
Keep up the good work!!
Keep up the good work!!
Race Director
Joined: Oct 2002
Posts: 16,477
Likes: 26
From: Gone
CI 6-7-8-9-10 Veteran
St. Jude Donor '03
I have not read through the last 10 or so posts, but I noticed some recomending to use solid lifters to check PTV clearance for a hydrolic setup. This is COMPLETELY wrong. Never use solid lifters to check ptv. There is a certain amount of pre-load stock hydrolic lifters will take, and a solid lifter will not give you an accurate measurement. I am speaking from experience, and almost cost me a motor.
Keep up the good work!!
Keep up the good work!!
Using a solid lifter will always give you a "worst case scenario" indicated clearance. It rules out any possibility of lifter compression masking what in reality could be valve travel towards the piston (once pumped up with oil pressure).
Example, checking with a solid lifter, you find you have .060" p/v clearance. Do same check with a hyd lifter in the same manner, and then you see .100" clearance. The lesser of the two readings is the one I'd trust and base decisions from, because the difference in readings likely came from lifter compression.
As we were checking it, we were using very light checking valve springs. Less likely to compress the lifter in the course of checking. The one time we did try checking with a normal valvespring, we got much better indicated clearance, because instead of the valve compressing clay, spring was compressing lifter. That's a bogus measurement, and one we did not trust.
Hope that makes sense.
