_Viper_
Posted 05 July 2014 - 04:08 PM
Hey all, was just setting the valve clearances with the YT adjustable rockers, looked up my cam specs on the crane cams site and it lists 0.026" while hot...
So im just curious why they have such a large clearance? I could understand if this was the cold setting as you dont want it to close up too much once it warms up but why such a big lash for when its already hot?
Does it actually get quite alot hotter when running hard under load and expands even more?
Lotsa Posts!
Posted 05 July 2014 - 04:45 PM
Cant answer the question but i think they might give those numbers to dial it in to give the duration as as per cam
taking the ramp of the cam into consideration.
The valves grow when hot as does the head so it is a bit hard to tell where they come from with the numbers.
Should imagine it might sound like a starfire with big clearance.
_tryhard_
Posted 05 July 2014 - 07:30 PM
set the tappets at 27 thou warm motor up then reset tappets the specs on the cam are correct I have a cam with 28 on exhaust and 26 on intake its so when everything warms up all the clearences close up due to parts swelling don,t forget to run cam in at 2000 rpm for 20 mins or you may wear lobes off cam if new
_Viper_
Posted 05 July 2014 - 07:50 PM
its so when everything warms up all the clearences close up due to parts swelling
Yea but you are setting the clearances after everything is warmed up? So it wouldn't close up anymore then it is.
And yea its not a new cam, was just re-setting tappets after changing the head gaskets
_Viper_
Posted 06 July 2014 - 09:54 PM
Anyone? It is rather rattly and I would like to close up the clearances but not if its going to cause any negative effects...
Lotsa Posts!
Posted 07 July 2014 - 07:06 AM
I would cut that clearance in half and try it,then maybe measure it when hot just to be sure
there is still clearance...but that is just what i would do.
_SLR Goat_
Posted 07 July 2014 - 07:40 AM
I wouldnt halve the 26 thou spec is it a solid cam? they do make a bit of noise i pulled my crane solid 288 down to 22 thou hasnt hurt it and felt a little more responsive
http://www.cranecams...s/mech-lift.pdf
Forum Fixture
Posted 07 July 2014 - 03:45 PM
_Bomber Watson_
Posted 07 July 2014 - 06:51 PM
From what i gather its probably best done on a dyno? Do a few lash loops and you will know where the engine wants them.....
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