zz4 break in

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Aug 12, 2008 | 09:32 PM

Tom 35th anniversary

Thread Starter

Burning Brakes

Joined: Aug 2001

Posts: 1,146

Likes: 9

From: Troy Ohio

zz4 break in

I see alot of breakin procedures for rebuilt motors, but I havent really seen anything on break in on a new crate motor. I have a new zz4 in and ready but I cant find any info on breakin. The motor had no documentation for break in and I cant find any info on GM site. What do you guys think?

Aug 12, 2008 | 10:31 PM

engle1147

Le Mans Master

Joined: Jul 2007

Posts: 5,043

Likes: 8

From: Tampa Florida

If your leaving the "old" cam bearings in there: pop the new cam in, forget about the break in and hit the gas!

Good Luck!

Aug 12, 2008 | 10:33 PM

engle1147

Le Mans Master

Joined: Jul 2007

Posts: 5,043

Likes: 8

From: Tampa Florida

I see it's not a zz4 cam it's the whole crate motor.......give her a couple hundred miles then let her rip!

Aug 12, 2008 | 10:40 PM

rodj

Le Mans Master

Joined: Aug 2000

Posts: 8,838

Likes: 31

From: Australia

You have a roller cam so no need to worry about the 30min @2000rpm to break cam in.
Normal driving ;generally no excessive load ; labouring or very hi revs.

Aug 13, 2008 | 12:44 PM

Bad Karma

Drifting

Joined: Oct 2006

Posts: 1,554

Likes: 13

From: Romeoville IL

Method we used to use for rebuild motors was drive around; accelerate normally, don't beat on it hard, but in gear vary engine speed. Speed up, slow down and use engine braking to slow the car down and get a load on everything should help seal the rings. Roller cam doesn't need any cam break in time like a flat atappet, so you are good there.

Aug 13, 2008 | 12:55 PM

65Z01

Team Owner

Joined: Dec 2000

Posts: 90,675

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From: SE NY

Cruise-In II Veteran

In addition, change the motor oil & filter after about 500 miles of break-in.

Aug 13, 2008 | 02:07 PM

1989vette

Burning Brakes

Joined: Aug 2007

Posts: 915

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From: salinas ca

Quote:

Originally Posted by 65Z01

In addition, change the motor oil & filter after about 500 miles of break-in.

and check for any metal shavings in the oil or filter.

Aug 13, 2008 | 04:02 PM

'Shifter

Team Owner

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St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15-'16-'17

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On page 402 of the 08 Performance Parts guide, they show the various steps....

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Aug 13, 2008 | 04:23 PM

Tiggers

Racer

Joined: May 2005

Posts: 461

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From: East Northport New York

I know this isnt the correct way, but I put my zz4 with a hot cam in my car about a month before I went racing. No way could I put 500 miles on my car in a month, so put about 200+ miles per recomendations, varying speed, no lugging, no redline shifts, changed the oil and off to the track I went. That was 4 years ago, 2500 miles, and probably 50 blasts down the 1/4 mile. Motor seems happy to me. (12.51 @ 111 best)