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Thread: Breaking in new cams, different than normal?

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Posts: 11-20 of 29
2008-03-29 22:59:24
#11
Originally Posted by Dudeman258
Thanks guys!

One quick one....

I had heard letting it idle can be bad because you are not at optimum oil pressure. Some say to prime the motor, start it, and drive around for 10min or so under 3k to let the cams wear in. As appose to just letting it sit for 10min...

Any thoughts?

Also, do you all use assembly lube when you install cams?

Thanks,

Dudeman


YES! Definitely use a decent amount of assembly lube when you put them in, everytime to put cams it, it doesn't matter if they are new or used.

As for letting them idle, I think it should be fine. I get plenty of oil in the head at idle.
2008-03-30 00:50:26
#12
cams should be 100% fine at idle if you aret getting enough oil to the head t idle, i wouldnt even try to start that motor as cams are the last thing i would be worried aout if the headwas getting a insufficent ammount of oil to the head.

as far as using lube for cam install thats 100% MUST and lots of it, like the above post, new or ued aftermarket or oem, always lube it up!
2008-03-30 02:56:38
#13
I agree with EXCEPTION. Do not overdo the assembly lube. Obviously put it on metal to metal contact points, evenly coated. Don't put so much on, that it looks like you just dumped the cam into assembly lube and pulled it out.
2008-03-30 03:09:54
#14
Ha, alrighty well that settles it. Done deal.


Dudeman
2008-03-30 09:57:16
#15
Any of the "pro-idle" posters wonder WHY JWT among others specifically says that the break-in for new cams should be ~ 20' in 2000-3000 rpm and NOT on idle?
2008-03-30 12:45:53
#16
It is recommended to rev the car periodically in the 10~15 minute span between 2K and 3K, yes. This just assists with ensuring that everything seats nice and tidy, and that the lobes are properly contacting the rockers.

Can you still idle the car for 10~15 minutes? Of course.
2008-03-30 13:55:03
#17
teKKiE,

I am certainly NOT going to tell you how to break-in your cams but all the JWT Cam Installation sheets in their site, specifically say 15-20 minutes of 1500-2000.

Not one of them says that "of course, instead of 1500-2000 rpm you can let it at idle".

Further food for thought on camshaft break-in:

http://www.minimania.com/ArticleV.cfm?DisplayID=1922

This is a strange and interesting article, you might try searching google with its title.

and

http://www.compcams.com/Technical/FAQ/CamandValveQuestions2.asp

item 7 on above page.

http://www.cranecams.com/?show=faq&id=1

Item B in above page.
2008-04-01 02:52:36
#18
I used JWT's break in steps for my N1s and so far all is good. Pulled off the stock VE vc to put my N1 vc on and checked the lobes after 1K miles. Clean with no wear marks whatsoever, nice and polished throughout high and low lobes. M1 0-40, always letting the motor warm up properly before driving it.
2008-04-01 03:04:54
#19
I understand what JWT's saying. And there's nothing wrong with that. I'm just saying that letting the motor idle is no different than revving the car from 1500 to 2K rpm. The lobes are STILL contacting the rockers. The biggest thing is to ensure that everything is seated properly. I'm not telling everyone NOT to rev the motor to 1500~2K rpm for 10~15 minutes. I'm just saying that IMHO, it's not absolutely necessary.

YMMV.
2008-04-01 09:41:45
#20
Idling a cold engine is not good, as there is extra fuel for the 'choke', so the bores get washed off a bit, so more wear, also it takes longer to warm everything and get the oil up to optimum temp.

Best thing when starting any car from cold is to let it run for no more than 30 sec, then just drive it normal until it gets to temp. Formula 1 cars have a program in the ecu to start the engine and get it up to full operating temp as soon as possible to prevent wear on components with extreemly close tollerances.

From a run in point of view, a fresh engine with fresh bores deff needs to get out and drive, last thing you would want is the freshly honed bores pilling lumps off due to the extra fuel washing the oil off the bores.

From a cams point of view, i guess inspection would be a good idea before install, make sure there is no small fileings hanging off the edges of the cam, otherwise i cant see anything much to wear in.
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