I have to do a cam break in and am curious if any of you know how far out on the idler screw I have to turn to reach 3000 rpm so I can just let it idle. Also does anyone have any tips on breaking in the cam and a new engine? Thanks ahead of time!

 

Bubba- What we do a lot of the time is just set the idle up. Most rappys idle between 1300 and 1600 rpm. Get a few box fans and let them blow on the engine. I usually check to make sure there are no leaks and then i just cruise around for the last 15 minutes with out loading the motor. If you need to you can stop the motor before the cam break in is complete and finsh a little later if leaks or something happens.

 

I too am going to break in my cam this week...........after that thirty mins of 3000rpm+ with no load on it............is it good to go and see what it will do?........or do you still need to be easy on it for a few rides?.............I am also installing a 11:1 piston.........will that effect how I break the cam in?.........

what will I need to do?

 

Wulf and Bubba- Some on here tell you to ride it like you stole it from day one. I bought a new 2003 in Yuma AZ at FSW's. I went on the dyno with 15 minutes ride time on it. It made 30.92 HP. After 3 runs it was torn down. Looking at the cyclinder after the tear down that 3o minutes was hell on it. It is having to be honed and bored as i type. The better you break it in, the better it will be. After you spend a lot of money what is a little more time to do it right?

 

While breaking in the cam vary your RPM and don't let it idle to long, if you arn't hard enough on it it won't seat piston rings against that nice cross-hatch pattern you had honed in

 

I've got the same questions. I am installing a new tranny, 11:1 JE and Stage 1 Hotcam, with Craycraft porting and 686 bore.

I am scared to start the damn thing up after all I've read! For example, don't let it idle during cam break in, warm it up first, but at the same time you don't have any oil in the passages so don't rev it up at all. At the same time, in order to get the right amount of oil in it you've got to start it and then let it run for a few seconds and then pour in the rest of the oil, etc.

From all this, no matter what the heck I do its wrong. If I start it and let it warm up before taking it to 3000 RPM for cam break in, then that isn't good for the "no idle" break in for the cam. If I don't load it at all during the first 20 minutes, that ain't good for the rings. If I even start the freakin thing at all, then that isn't good for anything (no oil in the pump yet, etc.) I did use assy lube so that should be OK for initial start up but.. . .

Someone please give me the proper procedure for starting and break in of a newly rebuilt engine!

I'm dying over here!

Thanks

 

this was taken directly from trinitys website..


Camshaft Break-In Procedures:

Coat the camshaft lobes & bearing journals with an EP lubrication such as CL400 "Cam Guard" or a moly-paste. Avoid excessive cranking. The break-in procedure must commence as soon as the engine has oil pressure ( aprox 3 sec ). If the engine fails to start within 15-30 seconds, it is recommended to re-apply the EP lubricant to the lobes.

Start the engine and run at 2000 rpm, for 15 to 20 minutes. This may cause overheating with some engines so take appropriate
measures to ensure airflow ( NICE BIG FAN ) also if water cooled make sure no air bubbles develop in the cooling system after the first fire-up. After this take the engine off fast idle and shut the motor off. Readjust the valves. If any special camshaft prelube was used, change the oil filter.

These higher speeds increase splash lubrication and decrease nose loading. Use only oils that meet or exceed the latest API ratings. If possible, following break-in, the idle should be adjusted to the high specifications. Change oil after the first two hours of riding.

Motor Break-In Procedures

After cam break in ride the bike through the power band, do not rev the motor over 6000 rpm and do not lug the motor (just ride easy).

Try to ride like this for at least two tanks of fuel or 10 to 12 hrs. After this change the oil and check for proper valve lash. Then you're off!

Text

 

here you go.


www.mototuneusa.com/break_in_secrets.htm

 

I just put a Cam in my '69 Chevy, I would think the break in is about the same. I let it run on a fast idle for 15 min then shut it off for 30. Next Change your oil and get rid of all that cam lube. Now drive it around easily for a few hours, your done. Give it hell.

 

oil pressure!

3 seconds my rear end