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Old 07-16-2010, 10:57 PM   #1 (permalink)
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Valve lash?

Okay, I was thinking about getting a cam to try to help out my EGTs and turbo spool a bit... But Then I got to thinking about my days with gas performance... We used to tighten up our valve lash to make the cam "behave" like it was slightly bigger... I can think of no reason why this would not work on the CTD also. Can anyone else?

If this has been done before, how tight is "too tight"?
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Old 07-16-2010, 11:10 PM   #2 (permalink)
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You don't get as much affect on diesel, your only pumping air in. You might make a minor gain by moving the exhaust out faster, but basically that is what we ate doing with a turbo, that and a bit more air packed into the cylinder,
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Old 07-16-2010, 11:12 PM   #3 (permalink)
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i've built a 12 valve with a bigger cam in it, i do not know the specs of the cam now, but we set the valves to the stock lash, but with the bigger cam and pump mods, we bumped timing 2 degrees advanced, got big results, awsome throttle reponse, good lope, and power, i would say stick with the factory lash, better safe then bending push rods
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Old 07-17-2010, 02:00 AM   #4 (permalink)
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Quote:
Originally Posted by morinscummins View Post
i've built a 12 valve with a bigger cam in it, i do not know the specs of the cam now, but we set the valves to the stock lash, but with the bigger cam and pump mods, we bumped timing 2 degrees advanced, got big results, awsome throttle reponse, good lope, and power, i would say stick with the factory lash, better safe then bending push rods
You got good lope with a cam?
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Old 07-17-2010, 02:10 PM   #5 (permalink)
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You got good lope with a cam?
X2 . .. ?
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Old 07-17-2010, 04:46 PM   #6 (permalink)
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Quote:
Originally Posted by freak007 View Post
Okay, I was thinking about getting a cam to try to help out my EGTs and turbo spool a bit... But Then I got to thinking about my days with gas performance... We used to tighten up our valve lash to make the cam "behave" like it was slightly bigger... I can think of no reason why this would not work on the CTD also. Can anyone else?

If this has been done before, how tight is "too tight"?
i did mine at .009" intake and .018" exhaust to see if they would quiet down a little and it did work but i think mine were about .011" and .023" before. i would think about your egts and base lash slightly off of that. if youre always running over 1250* i wouldnt tighten them past factory settings by much at all. i only hit high temps once in a while ( once every trip out) and its typically around 700-800* so im not afraid of parts swelling from heat.

*all opinion*
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Old 07-17-2010, 05:32 PM   #7 (permalink)
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Originally Posted by tractors1952@hotmail.com View Post
You don't get as much affect on diesel, your only pumping air in. You might make a minor gain by moving the exhaust out faster, but basically that is what we ate doing with a turbo, that and a bit more air packed into the cylinder,
I need more of an explanation than this... Tightening lash allows the valve to open sooner and stay open longer.... In theory, this would allow the turbo to spool faster (more exhaust out) and EGTs to come down (more air from turbo, and valve open longer). I do not see why this would be any different on a diesel than a boosted (or NA) gasser...


Quote:
Originally Posted by JBradley500
i did mine at .009" intake and .018" exhaust to see if they would quiet down a little and it did work but i think mine were about .011" and .023" before. i would think about your egts and base lash slightly off of that. if youre always running over 1250* i wouldnt tighten them past factory settings by much at all. i only hit high temps once in a while ( once every trip out) and its typically around 700-800* so im not afraid of parts swelling from heat.

*all opinion*
What were the results of your tightening the lash down? Did you notice any difference in EGTs or performance? Your mods look pretty similar to mine...
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Old 07-17-2010, 05:57 PM   #8 (permalink)
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i didnt notice much besides underhood noise went down and you really notice the piston pumps noise (which is getting annoying by the way). the truck does run smooth and i dont have any problems with them set the way they are. i guess thats the best i can give you.

oh yeah i did mine cold after a night of sitting.
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Old 07-17-2010, 11:22 PM   #9 (permalink)
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sounds to me like a cooler intake charge would fix both problems or you're throwin more fuel at it than your current turbo can handle
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Old 07-18-2010, 11:51 AM   #10 (permalink)
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sounds to me like a cooler intake charge would fix both problems or you're throwin more fuel at it than your current turbo can handle
yup, it sure would... Any of these things would help me out...

cost of N2O - $1000
Cost of IC upgrade - $500
Cost of W/M - $1000
Cost of Cam - $400
Cost of ported head - $2500


I think that tightening the lash down a littler bit would help too... Although not nearly as much as any of the above upgrades...


JBradley500 - Are you still on stock valve springs? How long have you been running like that?
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Old 07-18-2010, 02:17 PM   #11 (permalink)
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i am on stock springs. ive been running it this way for like 5000 miles maybe and have had no issues. my truck has just under 150,000 miles on it by the way.
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Old 07-18-2010, 10:12 PM   #12 (permalink)
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yeah truck had a real good lope.
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