Solid roller FAQ...
06-11-2006, 03:41 PM
#4
How about...
What kind of valve lash growth is normal from cold start to hot?
How does lash effect power?
Should you wait until the car is fully warmed until you start driving or can you do "light" driving during warmup?
People have said that you should not let a solid roller idle for a long time or cruise @ a low RPM...
What kind of valve lash growth is normal from cold start to hot?
How does lash effect power?
Should you wait until the car is fully warmed until you start driving or can you do "light" driving during warmup?
People have said that you should not let a solid roller idle for a long time or cruise @ a low RPM...
06-11-2006, 04:41 PM
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Originally Posted by Phil99vette
How about...
What kind of valve lash growth is normal from cold start to hot?
What kind of valve lash growth is normal from cold start to hot?
How does lash effect power?
Most cam designs have a "clearance ramp" in their design that gently takes the lash out before it opens the valve and when it seats the valve. If you get the lash above this ramp, you will be increasing the acceleration at the first degree of valve motion, and that can cause reliability issues.
Should you wait until the car is fully warmed until you start driving or can you do "light" driving during warmup?
When the engine is cold, the lash is tighter then normal. This may hurt the performance a little until the engine warms up, but it doesn't hurt the reliability.
People have said that you should not let a solid roller idle for a long time or cruise @ a low RPM...
Now most lifter companies offer pressurized oiling to the wheels(They usually have a .025" hole EDM'ed between the oil ring and the where the axle goes through the body). This fixes all the problems we use to have with running solid roller lifters on the street.
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06-12-2006, 08:00 AM
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Originally Posted by CamKing
Most cam designs have a "clearance ramp" in their design that gently takes the lash out before it opens the valve and when it seats the valve. If you get the lash above this ramp, you will be increasing the acceleration at the first degree of valve motion, and that can cause reliability issues.
I've noticed on my comp xe street roller lobes that the lash grows right before you get on the lobe and right after you get off the lobe. Does that sound normal to you CamKing?
06-12-2006, 08:33 AM
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Originally Posted by DAPSUPRSLO
I've noticed on my comp xe street roller lobes that the lash grows right before you get on the lobe and right after you get off the lobe. Does that sound normal to you CamKing?
To check this, you can pull off the rockers and put an indicator on the lifter. The basecircle runout should be less then .001". If it's more then that, you've got a poorly made camshaft.
06-12-2006, 08:52 AM
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Originally Posted by CamKing
If it's growing by just .002" or less, that's most likely just the cam flexing caused by the springs pushing on the other lobes.
To check this, you can pull off the rockers and put an indicator on the lifter. The basecircle runout should be less then .001". If it's more then that, you've got a poorly made camshaft.
To check this, you can pull off the rockers and put an indicator on the lifter. The basecircle runout should be less then .001". If it's more then that, you've got a poorly made camshaft.
06-12-2006, 08:59 AM
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Originally Posted by DAPSUPRSLO
You got it, .002" or less. I thought that it was the lash ramps you're speaking of but you say it's the cam flexing huh. This setup has 1.95 rockers and 959 comp pacaloys generating around 250seat 700 open so I guess there is some pretty good pressure put on the cam!
06-12-2006, 09:07 AM
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Even with the 55mm journals of the ls1? Is there even room to hog out the cam tunnel to install those large bearings? I'm content with what I have now, but am interested in your thoughts. Erik, my engine builder, of HK Enterprises built the shortblock and knows what i'm running and if he feels confident in the babbit bearings I do to
06-12-2006, 09:57 AM
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Originally Posted by DAPSUPRSLO
Even with the 55mm journals of the ls1? Is there even room to hog out the cam tunnel to install those large bearings? I'm content with what I have now, but am interested in your thoughts. Erik, my engine builder, of HK Enterprises built the shortblock and knows what i'm running and if he feels confident in the babbit bearings I do to
With the roller bearings, we see a lot less flex, and we see a lot less tracking on the lobes. It's not a huge deal, but it does help. If you start having cam bearing issues or too much tracking on the lobes, you may want to look into it.
06-12-2006, 10:11 AM
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Originally Posted by CamKing
I've got a lot of customers running them on the stock LS1 block.
With the roller bearings, we see a lot less flex, and we see a lot less tracking on the lobes. It's not a huge deal, but it does help. If you start having cam bearing issues or too much tracking on the lobes, you may want to look into it.
With the roller bearings, we see a lot less flex, and we see a lot less tracking on the lobes. It's not a huge deal, but it does help. If you start having cam bearing issues or too much tracking on the lobes, you may want to look into it.
