Nasty!
lol
looks pretty fooked karlos
10-10-2010, 08:36 PM
#7
Karlos, IMO its a cunt to change the piston only, and i've got a press in the shed. You need to properly support the piston whilst you press out (then in) the pin otherwise you crack the skirt. You could try heating the piston and tapping out the pin i guess??
Pistons with rods (standard) come up on the bay a fair bit for next to nothing, and if one piston is like it i would deffo check the others VERY carefully lol.
PS, cleaned the block today mate and it all looks good, cheers
off to the machinist on friday 
Rob,
Pistons with rods (standard) come up on the bay a fair bit for next to nothing, and if one piston is like it i would deffo check the others VERY carefully lol.
PS, cleaned the block today mate and it all looks good, cheers
off to the machinist on friday Rob,
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10-10-2010, 08:42 PM
#8
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having removed standard cast pistons from rods, and then fitted new 1s, i will be the 1st to say its a mare of a job lol
as said, needs supporting a lot, a punch or press the same size as the pin, plus a lot of heat from a blow torch!
obviously removing isnt a massive issue as if the skirt cracks, its scrap anyways, but refitting the new 1 needs to be perfection, and making sure the pin goes through the rod square, whilst its all red hot, its great fun
id go the route of buying a piston n rod complete on ebay, but if u want a standard piston on its own, i think 3 of my 4 old 1s survived intact, just stuffed up the loft destined to do nothing
as said, needs supporting a lot, a punch or press the same size as the pin, plus a lot of heat from a blow torch!
obviously removing isnt a massive issue as if the skirt cracks, its scrap anyways, but refitting the new 1 needs to be perfection, and making sure the pin goes through the rod square, whilst its all red hot, its great fun
id go the route of buying a piston n rod complete on ebay, but if u want a standard piston on its own, i think 3 of my 4 old 1s survived intact, just stuffed up the loft destined to do nothing
10-10-2010, 09:32 PM
#10
Karlos, IMO its a cunt to change the piston only, and i've got a press in the shed. You need to properly support the piston whilst you press out (then in) the pin otherwise you crack the skirt. You could try heating the piston and tapping out the pin i guess??
Pistons with rods (standard) come up on the bay a fair bit for next to nothing, and if one piston is like it i would deffo check the others VERY carefully lol.
PS, cleaned the block today mate and it all looks good, cheers off to the machinist on friday
Rob,
Pistons with rods (standard) come up on the bay a fair bit for next to nothing, and if one piston is like it i would deffo check the others VERY carefully lol.
PS, cleaned the block today mate and it all looks good, cheers
off to the machinist on friday Rob,
Glad your happy mate, be nice to get your engine built up I bet!
having removed standard cast pistons from rods, and then fitted new 1s, i will be the 1st to say its a mare of a job lol
as said, needs supporting a lot, a punch or press the same size as the pin, plus a lot of heat from a blow torch!
obviously removing isnt a massive issue as if the skirt cracks, its scrap anyways, but refitting the new 1 needs to be perfection, and making sure the pin goes through the rod square, whilst its all red hot, its great fun
id go the route of buying a piston n rod complete on ebay, but if u want a standard piston on its own, i think 3 of my 4 old 1s survived intact, just stuffed up the loft destined to do nothing
as said, needs supporting a lot, a punch or press the same size as the pin, plus a lot of heat from a blow torch!
obviously removing isnt a massive issue as if the skirt cracks, its scrap anyways, but refitting the new 1 needs to be perfection, and making sure the pin goes through the rod square, whilst its all red hot, its great fun
id go the route of buying a piston n rod complete on ebay, but if u want a standard piston on its own, i think 3 of my 4 old 1s survived intact, just stuffed up the loft destined to do nothing
If not then ebay it is or someone else on here of course!
Should be plenty kicking about as 99% of rebuilt RST's have to go at least 0.5mm oversize because of bore wear.
11-10-2010, 03:25 PM
#11
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i will go up the loft and dig them out and sort out the best of the lot for ya, there was nothing wrong with them, i just bought all new, and they were used in an unbored block, so are standard size and compression. if u cover postage and wana sort me a beer token, then thats very cool with me, pointless keeping 3 pistons that are now too small for my block lol
will drop u a pm later dude
will drop u a pm later dude
11-10-2010, 05:21 PM
#17
lolGo get it out then!!
12-10-2010, 10:20 AM
#18
Thats the problem, when you skim them they lose alot of the stregth on the crown.
I dont skim my std pistons as they will take more boost for a longer period before they fail.
Companys spend lots of time and money developing the best CR for the std cast type pistons, change them and you will no doubt change the characteristics of the design.
Anything above 16psi is high boosting for stock CVH pistons. At this point its down to how well the engine has been built and how good the piston material is from the factory.
12-10-2010, 10:43 AM
#19
Companys spend lots of time and money developing the best CR for the std cast type pistons, change them and you will no doubt change the characteristics of the design.
then we come along and change it all....
anyway my point is, that by changing the things we do fords original cr calculations for economy, reliability, fuel type etcetc, aren't really relevant any more. I don't think they were particularly scientific in the first place, compared with say a CAD modelled zetec....
Rob,
Last edited by Rob_DOHC; 12-10-2010 at 01:55 PM.
12-10-2010, 01:53 PM
#21
Thats the problem, when you skim them they lose alot of the stregth on the crown.
I dont skim my std pistons as they will take more boost for a longer period before they fail.
Companys spend lots of time and money developing the best CR for the std cast type pistons, change them and you will no doubt change the characteristics of the design.
Anything above 16psi is high boosting for stock CVH pistons. At this point its down to how well the engine has been built and how good the piston material is from the factory.
I dont skim my std pistons as they will take more boost for a longer period before they fail.
Companys spend lots of time and money developing the best CR for the std cast type pistons, change them and you will no doubt change the characteristics of the design.
Anything above 16psi is high boosting for stock CVH pistons. At this point its down to how well the engine has been built and how good the piston material is from the factory.
I still dont see how boost can crack a ring land, it's the shockwave from Det that does it, and after all boost is only relative to the engines VE.
Thanks fella but got one sorted now!
Last edited by Karlos G; 12-10-2010 at 02:01 PM.
12-10-2010, 02:02 PM
#23
Did a bit of reading earlier, bad ring gaping (too small a gap) can cause the above damage, so can too large a piston to bore tolerance as the piston slop creates a side load on the ring/ring lands cracking and thus breaking them..... and looking at where its broken that could be it....
Cylinder pressure was also mentioned as a possible cause as most force (from combustion pressure) is exerted on the ringland under the first ring, however, knowing how chocolate rst rods are i suspect they would be damaged to???? det was also mentioned but this should be obvious on the piston face too.
High rpm was also mentioned as a possible cause... so essentially every thing lol....
I guess you won't really know for sure... had the engine ever been rebuild?
Any way bugger all this Karl, i reckon your missus dropped it on the floor when you were making the tea
Rob,
Last edited by Rob_DOHC; 12-10-2010 at 02:07 PM.
lmao
12-10-2010, 02:51 PM
#27
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Never mind all that, your bird was stripping the engine down with you? where did you find one like that? congratulations my bird wont even step into the garage
my bird wont even step into the garage
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