30 replies to this topic

[RooBoonix]

Had a similar engine issue last year with a newly built engine. I was driving it too gently and I did have puffs of smoke on the overrun. I just drove it harder for the next 500 miles and everything bedded in and the oil consumption stopped almost entirely. Don’t thrash it with high revs, but do put it under load to get those rings bedding in properly. I did my bedding in in short 3 second bursts. Foot flat to the floor and then letting off again. Wait 30 seconds and then repeat. Did the trick. Next engine I’m running in is going to get punished from the 1st mile!

This is exactly what I did (I think I followed the procedure on CalverST) and my engine has been spot on

[Minigman]

Had a similar engine issue last year with a newly built engine. I was driving it too gently and I did have puffs of smoke on the overrun. I just drove it harder for the next 500 miles and everything bedded in and the oil consumption stopped almost entirely. Don’t thrash it with high revs, but do put it under load to get those rings bedding in properly. I did my bedding in in short 3 second bursts. Foot flat to the floor and then letting off again. Wait 30 seconds and then repeat. Did the trick. Next engine I’m running in is going to get punished from the 1st mile!

This is exactly what I did (I think I followed the procedure on CalverST) and my engine has been spot on

[Minigman]

Had a similar engine issue last year with a newly built engine. I was driving it too gently and I did have puffs of smoke on the overrun. I just drove it harder for the next 500 miles and everything bedded in and the oil consumption stopped almost entirely. Don’t thrash it with high revs, but do put it under load to get those rings bedding in properly. I did my bedding in in short 3 second bursts. Foot flat to the floor and then letting off again. Wait 30 seconds and then repeat. Did the trick. Next engine I’m running in is going to get punished from the 1st mile!

This is exactly what I did (I think I followed the procedure on CalverST) and my engine has been spot on

My engine builder told me to drive mine like my Granny was in the car. Not good advice, or his Granny was a nutter!

Edited by Minigman, 27 June 2019 - 07:52 AM.

[Spider]

 

 

Had a similar engine issue last year with a newly built engine. I was driving it too gently and I did have puffs of smoke on the overrun. I just drove it harder for the next 500 miles and everything bedded in and the oil consumption stopped almost entirely. Don’t thrash it with high revs, but do put it under load to get those rings bedding in properly. I did my bedding in in short 3 second bursts. Foot flat to the floor and then letting off again. Wait 30 seconds and then repeat. Did the trick. Next engine I’m running in is going to get punished from the 1st mile!

This is exactly what I did (I think I followed the procedure on CalverST) and my engine has been spot on

My engine builder told me to drive mine like my Granny was in the car. Not good advice, or his Granny was a nutter!

 

 

Regardless of anyone else's opinion, really one should follow the engine builder's advice. Not following this may void your warranty.

 

Different Rings, Honing and Bore finishes can require different running in methods.

[Steve220]

I was always told (by several builders now) to do runs of 1500—4500 at 70-80% wide open throttle, then let it engine brake down to 1500 again and repeat. Rings don't take a great deal of time to actually bed in. Seen several engineering articles (I'll dig them out later) have said by 100 miles they're almost done.. As long as you do it properly ?

Edited by Steve220, 27 June 2019 - 09:12 AM.

[Spider]

Seen several engineering articles (I'll dig them out later) have said by 100 miles they're almost done.. As long as you do it properly

 

Most Ring Sets will bed in well enough in the first 30 - 200 miles to allow for more 'normal' use and have acceptable oil consumption, but most rings sets don't fully bed in until you've done cira 3000 - 6000 miles.

[RooBoonix]

I've read more stories related to excessive oil consumption with gentle bed in than I have with a "harder" bed in. My actual experience is extremely limited having only built 1 engine... Mine.

As Moke said above follow your engine builders advice and you have something to fall back on, everyone has their own preferences.

Edited by RooBoonix, 27 June 2019 - 09:40 AM.

[wezg]

Sorry folks... Yes engine has done 70,000km.. Normally I work in Miles but this car is from Europe so its still in KM.. Would normallu have written 70k...its the simple things that confuse..

This car is driven quite spiritedly and as its done 70,000km (43500 miles) and only just developed the issue im fairly sure the rings have bedded by now..

I can only assume the bores have glazed and we are getting an almost perfect burn situation so dont see any evidence of the oil..

Just never come across this in any engine that I have ever worked on...

[surfblue]

So you havent converted it to a two stroke then? 

[Rorf]

Wez you haven't mentioned what oil this engine is using. Synthetics can cause the problems you are indicating, usually used after a rebuild and the rings never bed in.

[wezg]

Rorf
Its Halfords classic 20/50 mineral oil..
Alway been run on this oil.. And it is changed on a regular basis..

( I run a garage in Scotland ..restoring and maintaining classic mini's and saab's.)

[Rorf]

Maybe the compression rings were installed upside down

[DeadSquare]

Engine is still smoke free on overrun.. And thats with a passenger in the car looking for smoke so not just try to use mirrors..
The engine has done  70km  since it was over bored so not really that high a milage.
We put the camera down the bores aswell and no scores to report but maybe a slight lack of cross hatching is visible..thats my only concern that I have found..
I just cant see how its using so much oil yet producing NO smoke.. Is it possible we have the perfect burn situation..?

Wez

 

How carefully was the engine "run-in" ?

 

How far into the 43,500 miles after it was over bored, did it start consuming oil ?

Edited by DeadSquare, 29 June 2019 - 07:02 AM.

[cal844]

What about trying a leak down test?

[wezg]

Cal.. We have done a leak down test and got between a 14 and 19% which is nor.ally acceptable.. Its once you get to 30% or more does it require a rebuild.