cant belive its done

[Demlotcrew]

Jamie is not far off, the only part of an engine that is of any real interest to us when beading in are the piston rings, all the FI guys who are chiming in wont even notice if two of the piston rings are broke as they sole rely on boost from the turdbo to make their cars move, compression in the cylinder bores isn't much of a problem if the rings are not bed in properly. But on a high comp NA engine its critical, and just for the record I doubt Jamie's M40 in top gear would reach the red line which is why hes taken that technique on board for his particular engine type.

The best advice i can give you is to let someone else who doesn't care about the car bed it in for you (approx 50 miles) and obviously knows what they are doing. But if youre that worried about your poor M42 then stick it on a engine dyno and have them run a engine break in program that way you can guarantee it will be 100% close to ideal!

But the most interesting part of this is, did you break the engine in before the turdbo was fitted on the stock EMS or did you break it in at the same time as it was being mapped for the first time? If it was mapped and bed in at the same time, no matter what you do now its too late the damage has been done.

Andrew

[Morat]

This article is the intellectual property and copyright of David Baker and Puma Race Engines

Max, do you know who David Baker is? Do you personally vouch for his engineering expertise? Are you 100% sure that a Puma Race Engine needs the same running in as an M42?

If not, you're just regurgitating someone else's opinion. In the age of the internet, opinions are everywhere and third party information is only a google-click away. The best thing to do is leave the answers to the people who have first hand experience of the problem, because those are the replies which are important.

Not trying to jump down your throat, just some advice.

[hartgefan]

is that supposed to let you off the hook maxfield it has no mention of red lining the engine just says full throttle in 4th or 5th for 10 seconds so your not going near the red line even in a f40

[HairyScreech]

i think in his defence what he ment was put it under load in 4th or 5th for short periods to allow the piston rings to bite against the bores and wear a maiting serface, then allow the engine to coast down to cool the cylinders off as a lot of heat will be generated while doing this.

tbh with older engines that had slacker tolerances, side cams and rockers, and relatively in efficient oil pumps the conventional meathod is apropreate, but considering the improvements in modern engines and manufacturing techniques etc, then im with the meathods posted in the two links.

i dont profess to be an expert, a gifted amature maybe but i cant see any reason for using an extended breakin period on a modern engine, tho i guess the reason im doing motorsport engineering is to be able to say for definate.

[Gussy]

I ran a car corsa d(?) in with 7 miles on it the other day. Put it this way, i wouldn't want to own it in a few years

Bounce Bounce

As far as I know practically every car from the factory is run in properly these days. They use special oils to bed in the engine before leaving the factory by all accounts.

[abelai]

I think the trouble here is that there are two areas of the engine that need running in and they want different types. The bottom end requires low rpms and low load but the piston rings need the higher rpms and engine braking to make them sharp. I know some people run the bottom end in nice and soft for 2000miles then re-hone the bores change the rings drive it normal but not holding constant rpms or too high for about 500miles then hammer it hard which gives a good strong compression.

[HairyScreech]

now thats a good idea ^^ but a bit labour intensive.

[Demlotcrew]

^ Eh? the bottom end?

Theres nothing that needs to bed in (the shells never touch the crank) a film of oil under pressure keeps the crank 'suspended' when you have a oil surge then the shells might touch the crank and spin as a result.

Andrew

[james_obryan]

Jamie

one day you will knowingly quote some cr@p you've read somewhere, some poor sod will mistakenly think you're an expert engine builder or something (because that's how you come across!), take your advice as gospel and destroy their engine.

as far as your running-in technique goes, it might be safe on a low geared car that will get to full revs in top on fairly light throttle, but on a high geared car you'll be on full throttle at high revs for a long time which doesn't sound too clever to me.

however, not being an expert, i don't really know and i'm certainly not going to pretend to

I believe it was the advice of Turbo-brown (??).

It was some respectable Zoners that gave me the info.

Only saying what I've been told.

Hey ho, I'll keep my mouth shut in future.

please do for the greater good

[Demlotcrew]

Think we heard you the first time James!

[Simon]

Multiple posts deleted.

[maxfield]

Everyone else is giving me abuse apart from Demlot who is normally first to jump on me!

[HairyScreech]

i thought that was andyboy or pacerpeat

[rikster]

just drive it for f**k sake