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Author Topic:   Valve Adjustment Help...
msnead
Dirt Forum Racer

Total posts: 77
posted July 08, 2005 07:02 AM  
As I've posted in many other threads, I'm a newbie to these big cars with 8 cylinders. (I come from karting...)

When we bought the car, I was told that the cam that was in it was the "Midwest Motorsports Grind #2" cam... The problem I have is that nobody told me what lash to adjust the valves to...

I realize that I can call Midwest--but I don't know if they need any additional information like what rocker arms we are using, etc.

I've also been shown how to do it once or twice...but does someone have documented directions for the proper way to adjust the valves and how often it should be done?

One other thing--I hate not knowing what is inside this motor...as far as the roller-rockers go, they are an orange-ish color anodized aluminum...does anyone recognize the color to know what brand they are?

Thanks,

M

Stans2411
Dirt Roller

Total posts: 16
posted July 08, 2005 07:11 AM  
I believe these are the spec.s for your cam. See lash at the bottom.
Int. Duration @ .050": 256
Exh. Duration @ .050": 264
Int. Lift: 545
Exh. Lift: 563
Lobe Separation: 105
Adv Int Duration: 287
Adv Exh Duration: 295
Valve Lash: .026-.026

Kromulous
Dirt Forum Champ
Total posts: 796
posted July 08, 2005 08:19 AM  
Probaly Harland Sharp roller rockers, the ratio should be stamped on them. They might be some older Crane gold series, but it really dont matter.

We run the valves everytime we change the oil. Check the speedway website for info on doing it, but i dont like there hit skip method but you can get a feel for how to do it.

We start on the left bank (drivers side) furtherest cylinder fwd and work to the back, set them one by one, intake, exhaust, move to the next cylinder and repeat. Once that bank is done do the same thing on the right bank.

B.K.ENG45
Dirt Full Roller

Total posts: 31
posted July 08, 2005 01:26 PM  
the way i was taught by my engine builder long ago goes like this....YOU ADJUST THE EX. VALVES WHEN THE INTAKE OPENS UP AND JUST STARTS TO CLOSE....YOU ADJUST THE INTAKE WHEN THE EX. JUST STARTS TO OPEN HOPE THAT'S SIMPLE ENOUGH. HAVE A GOOD ONE, BRAD

dluna
Dirt Freak

Total posts: 334
posted July 08, 2005 02:02 PM  
What do you guys think about the Valve Adjustment Order in the ToolBox. Start with #1 Intake and #1 Exhaust, then do half of the valves. Rotate engine 1 turn to get to #6 I and #6 E, then do the other half???

This may be what Krom mentioned above that he didn't care for. I've tried it this way and get pretty close to the same results when doing one cylinder at a time.

Kromulous
Dirt Forum Champ
Total posts: 796
posted July 08, 2005 02:12 PM  
Its probaly quicker, but i worry i'll miss one by jumping around.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted July 08, 2005 07:21 PM  
dluna.....thats how I set my valves and how I've set them for years without any troubles!

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