Re: fresh engine started! some questions now
[Re: Pacnorthcuda]
#423300
07/29/09 08:54 PM
07/29/09 08:54 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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I don't believe in putting a new cam in a new street engine. Usually you've got a perfectly good "stocker" or alternative grind of some sort, so build the new engine with THAT cam. Get the engine together, sort out all the leaks, junk, stuff that "doesn't" the ignition, and get the rings broken in and running good.
THEN tear 'er down and slip the new wobble stick in there, and now you've got confindence in everything else, you can just fire' er up, quickly set the timing and let er run
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Re: fresh engine started! some questions now
[Re: Pacnorthcuda]
#423301
07/29/09 08:55 PM
07/29/09 08:55 PM
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Joined: Sep 2003
Posts: 372 Ohio
jensenguy
OP
enthusiast
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OP
enthusiast
Joined: Sep 2003
Posts: 372
Ohio
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Quote:
Wiping a lobe can happen anytime but first fire is more common due to the foot of the lifter not yet developing just a SLIGHT ammout of wear that effectively increases its contact patch (and therefore reducing its pressure per small fraction of inch) with the lobe.
You had assembly lube on the lobes right? That should protect them during the initial cranking. You are using a camshaft breakin additive of some sort? You have a plan to ensure adequate zinc/phosphorous in the oil right?
Next time you fire, again bring it up to 2000 (vary the RPM some) for a while longer.
Fan on radiator is always smart during this procedure--overheating is not uncommon.
OK That makes sense about the lobes. I did have assembly lube on the cam, and Im using EOS along with the oil. Plus I primed the engine before attempting to start it the first time.
I do have electric cooling fans wired to a toggle switch, but I didnt have them on until close to the end of the run. I am going to pressure check my rad. cap too, its pretty ancient looking.
thanks!
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Re: fresh engine started! some questions now
#423303
07/29/09 09:05 PM
07/29/09 09:05 PM
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Joined: Nov 2007
Posts: 21,845 Kirkland, Washington
Pacnorthcuda
Too Many Posts
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Too Many Posts
Joined: Nov 2007
Posts: 21,845
Kirkland, Washington
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Quote:
I don't believe in putting a new cam in a new street engine. Usually you've got a perfectly good "stocker" or alternative grind of some sort, so build the new engine with THAT cam. Get the engine together, sort out all the leaks, junk, stuff that "doesn't" the ignition, and get the rings broken in and running good.
THEN tear 'er down and slip the new wobble stick in there, and now you've got confindence in everything else, you can just fire' er up, quickly set the timing and let er run
Lot of Work! I agree that 'knowing' an engine will fire and not have major issues is a big benifit while attempting to break in a new cam, but as a compromise to that method, why not just install weak (stock) valve springs for the first few starts? Much gentler on the cam and if there are other issues the cam should be fine. Then simply install the performance springs when ready.
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Re: fresh engine started! some questions now
[Re: gtx6970]
#423305
07/30/09 11:48 AM
07/30/09 11:48 AM
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Joined: Mar 2003
Posts: 4,848 Memphis
HemiRick
master
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master
Joined: Mar 2003
Posts: 4,848
Memphis
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You did fine. Yes run it at 2000 when you start it again. You wont know if it's all going ok till you run it some more....The 1st sign of problems is a valve that starts ticking.....Listen for this closely....Hopefully you'll never heard it. The extended cranking did not help things but theirs nothing you can do, sometime new engines just dont wanna start.
Take care, Rick 68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
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