TECHNICAL FOOD FOR THOUGHT

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Originally Posted by Red90

Despite your intent. Copying bad information only helps to spread it. People donÂ’t read carefully enough and will believe this nonsense.

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The actual intent of the post is to show that there is people out there with a some what moronic, uneducated or inexperienced knowledge of things mechanical that are prepared to put foot in mouth and type whatever they want in an effort to satisfy their own ego when they see it in print form, taking great favor from the fact it has been viewed by thousands of people around Australia or maybe the world.
These people exist in all forums even (I am sorry to say) this one, which for the better part has a greater percentage of people that do know what they are talking about.
There are also those people on all forums that are so puritan that they don't want to see the lighter side of any post or comment and criticize others that do, I for one like to read a bit of tongue in cheek with a post here and there.[biggrin]
These same people are the ones that love to hide behind their somewhat camouflaged name and bully "newwbies" when they first join a forum calling for backup from their mates to join in the hunt, and when attacked by the hunted they all back down saying "Ahh we were only having a bit of fun".
I think the word "Cowards" comes to mind.
:soapbox:Regards:- Patrick M.

I read it on the internet so it must be FACT, correct? [emoji848][emoji15][emoji6]

funny thing is .. didn't Nissan only recently come up with some variable stroke engine!

https://youtu.be/UczuQYf2V6Y

What was left out was this was apparently a **** take from a mechanic.

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Originally Posted by loanrangie

What was left out was this was apparently a **** take from a mechanic.

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Wow, that put it all in a different dimension again.
The bloke that wrote the original comment must have been joking, surely?

See Poe's law - Wikipedia

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Originally Posted by JDNSW

See Poe's law - Wikipedia

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Ohh, yes you are quite right I did forget to put the "winky" face on the post.
So here be it, although somewhat belated.[wink11]

My understanding is that rods/pistons etc stretch a little at higher reves, ie reach higher into the top of the cylinder.

Read some advice years ago to occasionally taking the vehicle to higher speed (higher revs but not red line) to ameliorate the wear ridge, to keep the bore as uniform as possible along its length to cope with rev increases you may experience in normal stress use - this is when my Ford engine had been rebored and I was installing new rings - hope it's a good excuse when the constabulary pull me over for 'slowing time' as I take the D1 Tdi300 to 135kmph.

Piston ring - Wikipedia

When fitting new rings to a used engine, special "ridge dodger" rings are sometimes used for the top compression ring, to improve compression and oil consumption without reboring the cylinder. These have a small step of iron removed from the top section to avoid making contact with any wear ridge at the top of the cylinder, which could break a conventional ring. These are not widely recommended, however, as they are usually not required and may give inferior oil consumption. A more acceptable method is to remove the wear ridge with a "ridge reamer" tool before lightly honing the bore to accept new rings.

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Originally Posted by workingonit

Read some advice years ago to occasionally taking the vehicle to higher speed (higher revs) to ameliorate the wear ridge (to keep the bore as uniform as possible along its length) - this is when my Ford engine had been rebored and I was installing new rings - hope it's a good excuse when the constabulary pull me over for 'slowing time' as I take the D1 Tdi300 to 135kmph.

Piston ring - Wikipedia

When fitting new rings to a used engine, special "ridge dodger" rings are sometimes used for the top compression ring, to improve compression and oil consumption without reboring the cylinder. These have a small step of iron removed from the top section to avoid making contact with any wear ridge at the top of the cylinder, which could break a conventional ring. These are not widely recommended, however, as they are usually not required and may give inferior oil consumption. A more acceptable method is to remove the wear ridge with a "ridge reamer" tool before lightly honing the bore to accept new rings.

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I can appreciate the problem happening when new rings are fitted to an engine where the block has not been re-bored, the piston rings have not got the same profile as the old rings which have worn to match the bore wear.
I tend to think that if a piston ring breakages in an engine that has been treated as a Toorak tractor (not travelled much over 80 KPH) for a number of years and all of a sudden being redlined over and over again can be attributed to carbon build up (for want of a better name) rather than the actual ring hitting the unworn lip at the top of the bore, the built up carbon is the culprit that would cause the stressing to the piston rings, unless of course the engine has so much wear in either the big ends, piston pin or whatever.
For this to happen then the engine has well and truly reached its use by date which could maybe brings the argument about this subject to a finish.
However I'm sure other blokes would be able to expand on this theory of mine and of course are most welcome to.
[bighmmm]
Regards:-
Patrick M.

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Originally Posted by Eevo

thats why cars have a red line, so the piston doesnt come all the way out.
hahah

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The redline is the cruising revs! The pistons will only come out if the piston springs are worn. YouTube