Register a free account today to become a member!
Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!

To thrash or not to thrash...

While discussing with a mate whether to thrash an engine from day 1 or whether to break it in gently, ( not much of a discussion coz I havent a clue what he was talking about ), he said the following 2 things

Just be careful about not pushing car hard enough P. Some cars that are run in too careful get polished bores, which leads to power loss. (Some cars can make 20 or so less bhp from not been run right).

A really good thing to do is a third gear burn. Open it up in third from about 30. Then, at 3/4 max revs just let off throttle and let it slow to 30 again. This causes a vacum in the cylinders that pulls the rings to the bores nicely.

and secondly

They once did a test in a bike mag I had. 3 bikes. One was run in by someones gran (really slowly). One was run in for first 500 miles, than absolutely thrashed. The other was caned from new.

The 3rd made most power (by 10 bhp or more), but the manufacturer said the engine would not last as long as the others (still more than enough for the first owner however, so let the next guy worry!). The second made good power, and would last ages and ages (and would eventually make the same power as the third, but not for a lot of miles). The first was knacked. No power and could prove unreliable.

Is this right, and if so what does the 3rd gear stuff that improves the engine performance?
  172 sport,

give it :devilish:hell best way imo, dependant on car as some are made for a bit of stick and some aint.:D

Sort of.... but not quite.

Polished bores are fine if the polish corresponds to the rings lol... it aint a good indication:oops:

the 3rd gear burn bit is bovine testicles..:devilish:

its simply a matter of getting the unit to normal temp with full fluids.. allowing a variation on rpm and load.. try not to keep anything toooooo constant..

thats it really.

the motorbike bit is probably an oft repeated tale, but also probably true. (in content)