Forged .... Running in....

[jamier27]

Anyone tell me what the scroll is for running in an engine with new rods in?

Just had some new forged rods in my mazda and am curious to know whats the best best/safest way to run the new rods in?

Due to get the car back very soon and possibly a few local meets..... But not much point in meets if i have to stay below 3k for 2000 miles!

 

[Fred@BTM]

loads of theories on this, i prefer doing it with "running in oil" and giving the engine load, none of this "keep it below 2000rpm for 1000miles"

 

[jamier27]

Ive been told to keep ot under 3k for 300 miles but not long motorway journeys but more little runs so cars gets to heat up fully and cool back down.
But i thought there would be many different theories to this.

When u say load... Do you mean wot in short bursts from 1k revs to 5k?
I guess different engines have better/worse ways of doing it

 

[Fred@BTM]

2nd gear and nail it to about 6k

none of this fully syn oil from day 1, cheap mineral oil, bit of load for half a day, drop the oil and put proper stuff in, done

 

[Laine_16v]

Its had new rods (and presumably bearings), not rings... Drive it as you usually would, there is nothing to "bed in".

 

[jamier27]

Yeah just rods bearings arp bolts etc
Nothing to bed in but surely the new metal will need to adapt fully to the new/different heats changes?

 

[Fred@BTM]

they'll be heat treated at factory, they'll only ever see, what, about 2-300degC inside an engine, they'll have seen higher than that being heat treated

 

[jamier27]

Just spoke to garage and he has just told me he has it on gentle map for 300 miles using half synthetic and have to go back when done a tankfull and will adjust map and change oil to fully synthetic. So all is good!

 

[furio-james]

Ive always kept the revs low (don't rev the tits off it) but load the engine up ie. low revs full throttle to medium revs. And also use engine braking too