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Author Topic:   Valve adjustment question
Eljojo
Dirt Forum Champ
Total posts: 968
posted March 03, 2005 06:00 AM  
I got this out of the toolbox on this site, but don't understand it at all. I have always adjusted the exhaust with the intake at full lift and the intake when the exhaust just starts to open (or backwards to that *it's written on the lid of my tool box) How will this work?

Small Block Chevy Valve Adjustment Order 0 deg TDC, both number one valves shut.

Adjust the #1 exhaust valve

Adjust the #1 intake valve

Adjust the #3 exhaust valve

Adjust the #5 intake valve

Adjust the #7 intake valve

Adjust the #2 intake valve
Adjust the #4 exhaust valve
Adjust the #8 exhaust valve
Now rotate the engine 360 degrees. The mark on the balancer should be back at the TDC mark. Keep in mind that this is not the TDC where #1 would be firing! It's where #6 would fire.
Adjust the #3 intake valve
Adjust the #5 exhaust valve
Adjust the #7 exhaust valve
Adjust the #2 exhaust valve
Adjust the #4 intake valve
Adjust the #6 exhaust valve
Adjust the #6 intake valve
Adjust the #8 intake valve

Your DONE!


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TEAMPCR
Dirt Freak

Total posts: 238
posted March 03, 2005 06:18 AM  
Doing it this way, you only have to turn the engine over once. The valves that are being adjusted are closed, either way, results should be the same.

ss99
Dirt Maniac

Total posts: 120
posted March 03, 2005 07:26 AM  
This method might work for a hydraulic or mild solid cam, but I wouldn't trust it with most of the aggresive race cams being used these days. The ramp speeds are pretty fast and the profiles pretty agressive to know for sure that the lifter is completely on the base circle with this method. The most accurate method is the way you've been doing it.

sdhnc29
Dirt Forum Champ
Total posts: 934
posted March 03, 2005 04:31 PM  
Do one cylinder at a time. Set the intake lash as the exhaust valve just starts to open. Set the exhaust lash as the intake valve just closes. This is the most accurate way to adjust your valves.

Steve

------------------
Hendren Racing Engines
Rutherfordton , NC
(828)286-0780
http://www.hendrensracingengines.com

TEAMPCR
Dirt Freak

Total posts: 238
posted March 04, 2005 10:09 AM  
I live, I learn. It is a good day. Even though I did not ask the original question, Thank you for increasing my knowledge. Dave

sdracer12
Dirt Maniac

Total posts: 180
posted March 04, 2005 11:19 PM  
Ok, here is how I adjust my valves on a chevy 360 roller motor. I have a balancer which is fully marked for 0 degrees, 90 degrees, 180 degrees, and 270 degrees.

Move engine to TDC 0 degrees, firing on #1 cylinder, with both valves closed. I set both valves on #1.

Then I bump the motor to the next 90 degree mark, and set both valves on #8 cylinder. Then I bump the motor to the next 90 degree mark, and set valves on #4 cylinder. I follow the firing order 1 8 4 3 6 5 7 2 until the motor has gone around 2 revolutions, and all eight pairs of valves has been set.

This is the way my motor builder recomends to set the valves. Is this accurate, or am I missing something?

Eljojo
Dirt Forum Champ
Total posts: 968
posted March 05, 2005 05:18 AM  
I used to adjust mine that way until my machinist gave me the other instructions. It's not hard to do and he said that just because the valves were closed did not mean that the lifter was on the lowest part of the camshafts eccentric. I trust him so I follow his instructions. I just saw that adjustment order in the forum toolbox and didn't "get" it.

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