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Amazing difference.......
https://www.slantsix.org/forum/viewtopic.php?t=15265		 Page 1 of 1
Author:  emsvitil [ Sun Dec 04, 2005 5:08 pm ]
Post subject:  Amazing difference.......
Finally got around to adjusting the valves (with 16000 miles I didn't think they'd be that far off) and car runs much better.....

Before:
Slightly rough idle when fully warmed up (I noticed, nobody else seemed to)
Slight low throttle surge until warmed up

After:
Idle smooth
no surge
peppier


All the intakes were loose;
amount off varied from .001 to .006
....1......2.......3......4.......5......6
(.001, .006, .006, .004, .006, .003)
or
(.011, .016, .016, .014, .016, .013)

Most of the exhausts were loose;
amount off varied from -.007(tight) to .006
....1......2.......3......4.......5......6
(.002, .006, .006, .005, .001, -.007)
or
(.022, .026, .026, .025, .021, .013)


Other than cyl 6, (which I think was a goof by someone since intake and exhaust are the same), valve recession doesn't seem to be a problem
Author:  Eric W [ Sun Dec 04, 2005 9:11 pm ]
Post subject: 
So, did you adjust to stock specs, or tighten them up some? I tightened up my intake to .009" and exhaust to .018". Made a big difference according to my "seat of the pants dyno".
Author:  emsvitil [ Sun Dec 04, 2005 10:02 pm ]
Post subject: 
Quote:
So, did you adjust to stock specs, or tighten them up some? I tightened up my intake to .009" and exhaust to .018". Made a big difference according to my "seat of the pants dyno".
Stock

I can see the peppy part, as now my cam has slightly longer duration.

But I don't get the surge or roughness (not complaining), as I thought 'tight' valves would cause roughness, and ignition timing & lean carb surge.


As an aside, does anyone know the relationship between duration and lash? How much more duration for a given decrease in lash.
Author:  75dartcustom [ Wed Dec 07, 2005 7:58 pm ]
Post subject: 
Eric, everything is good with the .09 .18 so far? If so I might try that this spring when I change carbs. I just don't want to do anything to put stress on the valves. I have to remember this car is supposed to last long more than its supposed to drive fast.
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