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#41
Bruny the piston itself won't have caused the gasket to fail. But the type of gasket or thickness of gasket we had to use to prevent the piston hitting the head may well be the weak link. If the compression test shows all good, but it's dumping eater on boost, the head is either lifting on boost or the sealing faces have failed this may be a distorted block face as the head was skimmed so we can eliminate that side. As boost increased so does the cylinder pressure this is why it leaks cylinder pressure into the water jacket on boost
#42
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People keep going about the comp ratio.well looking through msd website on a set up they check Compresion test.so surely msd cam confirm this for me after the car was done.?? I can tell every 1 now its all good
#43
cossie fan (unluckerly)
I would of but the price i was giving was way to much for me.with the car been near 150 mile away from me in bits i had no choice in to give it a miss.but it has never caused a problem,i just cant get over why people think its down to the piston what has caused this.its down to a hg not suitable for the job,simple
Last edited by ajamesc; 18-03-2011 at 09:41 PM.
#44
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Im not talking about engine out full strip just remove the sump and pull that one rod and piston put the other 3 on tdc and measure there hight do the same with the odd one then get the differance taken off if the rings are still with in tolerance and the shells ok then put it all back in how much power do u have can u not just use a small turbo escort h/gasket once u have sorted the odd piston
#45
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Im not talking about engine out full strip just remove the sump and pull that one rod and piston put the other 3 on tdc and measure there hight do the same with the odd one then get the differance taken off if the rings are still with in tolerance and the shells ok then put it all back in how much power do u have can u not just use a small turbo escort h/gasket once u have sorted the odd piston
#47
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Im not talking about engine out full strip just remove the sump and pull that one rod and piston put the other 3 on tdc and measure there hight do the same with the odd one then get the differance taken off if the rings are still with in tolerance and the shells ok then put it all back in how much power do u have can u not just use a small turbo escort h/gasket once u have sorted the odd piston seems a shame to give up on it everything can be fixed
#50
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Im not talking about engine out full strip just remove the sump and pull that one rod and piston put the other 3 on tdc and measure there hight do the same with the odd one then get the differance taken off if the rings are still with in tolerance and the shells ok then put it all back in how much power do u have can u not just use a small turbo escort h/gasket once u have sorted the odd piston seems a shame to give up on it everything can be fixed
#52
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#53
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If it doesnt go i will pay someone to do a whole bottom end rebuild for me
#55
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a engine with 3 same and 1 different piston ?? u taking the piss here ??
u been fooked well before it went to MSD, honestly i wouldnt even have touched ur pile of rubbish knowing above.
if u cant afford a YB rebuild then you probably shouldn't have 1 to start with.
why do people think cosworth YBs are cheap to run ? they are not.
u been fooked well before it went to MSD, honestly i wouldnt even have touched ur pile of rubbish knowing above.
if u cant afford a YB rebuild then you probably shouldn't have 1 to start with.
why do people think cosworth YBs are cheap to run ? they are not.
#56
cossie fan (unluckerly)
can u not do it yourself its only nuts and bolts any good machine shop can mill a piston crown the only thing that may catch u out is the measuring up all u will need is a sump gasket and a headgasket set once the head is off if you bend to old bolts into a hook screw them back in then use one of the wing to wing engine suports u can then remove the cross member to take the sump off may sound a lot of pissing about but will save alot of money
Last edited by ajamesc; 18-03-2011 at 09:57 PM.
#58
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a engine with 3 same and 1 different piston ?? u taking the piss here ??
u been fooked well before it went to MSD, honestly i wouldnt even have touched ur pile of rubbish knowing above.
if u cant afford a YB rebuild then you probably shouldn't have 1 to start with.
why do people think cosworth YBs are cheap to run ? they are not.
u been fooked well before it went to MSD, honestly i wouldnt even have touched ur pile of rubbish knowing above.
if u cant afford a YB rebuild then you probably shouldn't have 1 to start with.
why do people think cosworth YBs are cheap to run ? they are not.
#59
cossie fan (unluckerly)
But if they still look good then they are good lol it is best practice to change them if they are out but if u are on a budget
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to pull down a head and find a piston not machined to spec would make me think ho shit what else was missed skimped on !If it was me it puts the last build up in question and the quality of said work just look at it this way your engines ok no big damage done you know the problem and it can be fixed .
Last edited by Chaz888; 18-03-2011 at 10:06 PM.
#62
cossie fan (unluckerly)
The h/gasket went because it was to thick by the sounds of it as they must have checked to see if it was warped with a straight edge he may as well just use a small turbo escort one with his power level once he has sorted the piston out
Last edited by ajamesc; 18-03-2011 at 10:07 PM.
#64
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Just because it has good compression across all four cylinders dont count for squat, its when its on boost the damage gets done as the head will lift a tad and this boost pressure will find its way past the round sealing rings on the H/G and in to the water ways hence pushing the water out of your header tank. Once you get this little issue sorted it will cope with that power you are after with EASE for a long time if maintained well.
If you was close id be round there now stripping it down to help you out.
If you was close id be round there now stripping it down to help you out.
#65
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u were told to have the bottom end done, yet you decided not to. at the same time u say u dont have skills for spanners and dont understand engines, on what basis was your decision made then ?
surely on budget and nothing else.
so go do one cheapskate
#67
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So please go and play with the traffic
#68
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I would of but the price i was giving was way to much for me.with the car been near 150 mile away from me in bits i had no choice in to give it a miss.but it has never caused a problem,i just cant get over why people think its down to the piston what has caused this.its down to a hg not suitable for the job,simple
Yes the headgasket has blown for reasons, as MSD stated the thickness - the power running using such a thick gasket, no block skim.
But this is all because of the dodgy piston.
No dodgy piston = No silly thick gaskets = Perfect running car.
#69
Brunt you were given the option of piston out for machining my original contact with you over this issue said that was what was needed, but there was the option of trying a thick gasket,. It hasn't worked, it's no big deal, it hasn't really cost much, it needs now what it did to start with when we found the issue.
#70
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Yes i understand mate.its perfect running before.if i was to put the group a hg on ot will be back running 100 percent again.but people thinking am having a go and blaming some 1 where as i am not.msd did a great job on the car but if i was just more clued up more about cosworths i would with out thinking of had the block done but i was told it should be ok.so me been me went along with it.you win some you lose some
#71
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Brunt you were given the option of piston out for machining my original contact with you over this issue said that was what was needed, but there was the option of trying a thick gasket,. It hasn't worked, it's no big deal, it hasn't really cost much, it needs now what it did to start with when we found the issue.
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#74
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Once the head was off,surley to drop sump,remove piston,get piston machined and refit piston,would of only added another Ł250 max on top of job.and as for ppl saying he isnt blaming any body,thats how his op comes across,and in all fairness this should never have been aired on here,but kept between msd and bruny,
cheeRS stu
cheeRS stu
#75
±§~Quadzackular~§±
I have just been reading all this and if i was you ill give it ago myself! I dont have a clue about engines but im slowly taking mine apart and restoring it!
Mind you i hope to take it to msd when im done for a check over lol even though its 232 miles away. (i hear there good lol)
Got any pictures of your car mate? be nice to see what we are talking about!
Mind you i hope to take it to msd when im done for a check over lol even though its 232 miles away. (i hear there good lol)
Got any pictures of your car mate? be nice to see what we are talking about!
#76
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If the car doesnt sell for what i want for it i will no dout pay for a rebuild of the bottom end.the car surely deserves it as its a mint shell and motor
#77
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it will just be easyier for you to take the piston out and get it machined and so on build it back up put the other gasket on and see what happens there as james at msd said he will be on the other end of the line to help you if you get stuck it will save you a load of money on labour and you will have a bit of knowledge if u decided to got for new piston or do the rings as you will know how to strip the bottem end your self
#78
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On a different note, why would the pistons be odd in the first place?
#80
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