Running In New Engine

[Gavin Waddell 18]

Im going to run in my new engine in using the puma racing mrthod as it seems to make the most sense mechanically, i understand the principle of building pressurein the cylinder to push the rings against the bores. Now before i was going to start the process i was havina few concerns. i need to start the engine and let it run so that i can then retighten the cambelt. would this affect the running in process or not, also i think the airflow meter is a bit rich i would need to get the antipollution test done by my mate but that means driving it 4 miles, would this have a diverse affect on the rings or should i just take my to the garage doing the PR technique runnig rich. Now the dizzy is set retarded i need to set it up properly. Should i also leave this till after i have run the bores in and justset it up afterwards. Or can this be done whilst i run it up to temp for the cambelt

 

Basically can i run the engine once, and then run it again a bit rich and retarded to bed the the rings in, then set it all up afterward.

 

Argh im stepping into unknow territory and dont want to mess it up as i have spent some cash on this engine and dont want to break it.

 

thanks gavin

[rapidmi 4]

take it out and thrash it, its never done me any harm.

[Doof 11]

I can't imagine you can do the rings any harm by running it normally for a bit...if you have a new cam you have to run that at 2000rpm for 20 minutes first so this can't affect it all that much...

 

I'm sure A Graham Bells book suggests bedding in rings then going out for a few high power runs up to ~60% revs to force the rings into the walls.

[DamirGTI 342]

Read this :

 

http://guy-croft.com/viewtopic.php?t=78

 

Rgs !

Damir

[Rom 0]

There is no agreed method of running in engines. So many people have different opinions etc.

 

And as said, if its totally rebuilt / new parts, its almost impossible to do everything as told. Cams like to be run in different than rings etc etc.

My view is dont let the engine idle for long. You should be able to get the belt tension ok by turning it over by hand. Shouldnt have to run it.Also dont sit the engine at any rpm for long. Try and vary it as much as possible.

 

The information was told / read said that the first 20 miles or soemthing is the most crucial, and if the rings etc dont bed in properly they never will.

 

When i run mine in, i went for a pretty much give it some beans approach. Done runs up to 4k, let it coast back down. Checked everything over, levels etc. Done runs upto 5k let it coast back down, rechecked everything, same for 6k and then finally 7k.

Within about 15-20 mins of starting the engine for the first time, i was running it up to 7k.

 

Ive heard many stories about engines never reaching full potential because they werent run in aggresively enough. But ive also heard stories on engines being wrecked because they were trashed too much.

 

Just read Guy Crofts advice. While im certainly not saying its wrong, its not what i would use myself. No doubt Guy builds many great engines,all run in like this. But then so do the people who advise other methods.

 

Im a firm beliver that while it shouldnt be threashed to death, it should certainly be run in in a spirited fashion.

Edited May 27, 2008 by Rom

[Gavin Waddell 18]

ops first mistake i kind of let it idle as to retension the belt later but should be alright (i Hope).

Any how whilst it was sitting there ideling like it shoudnt of been the water temp came up nicely and then at about 80 degrees which is the one before last line on the gauge me thinks, it started spewing coolant out of the over flow, about 1.5 litres. Now it has got an 82 degree thermostat in, was this it opening and and the air behind coming out or is that stupid, its not the first engine that has done it to me, Im puzzled.