Engine Rebuilds
Discussion
Hi all.
If you wanted to keep a car forever (not that i'm planning to) over time it would eventually loose some power.
What is required to bring an ageing modern engine back to factory fresh levels of power etc. is it generally just piston rings? Re sleeving of the cylinders? Or is it more involved than that?
Cheers
If you wanted to keep a car forever (not that i'm planning to) over time it would eventually loose some power.
What is required to bring an ageing modern engine back to factory fresh levels of power etc. is it generally just piston rings? Re sleeving of the cylinders? Or is it more involved than that?
Cheers
Edited by Fraser Z4 on Monday 21st November 23:20
When the head gasket went for the second time on my ALPINA B3S (admittedly at 180k miles), I took the decision to give the engine a full overhaul. Two of the pistons needed replacement - courtesy of some unusual pitting on the face of each - and the rest of the engine received some TLC.
The crank was sent off for grinding but came back having only needed a light polish, which meant standard bearing shells were replaced. The cams were just as pointy as they were when first put into the engine and the cylinders received a gentle rub down to remove any sheen.
The head was skimmed and the exhaust valves received some attention to smooth the edges and guarantee a full seal - but apart from that, everything was stripped, cleaned and replaced.
Prior to the rebuild I was enjoying oil consumption at about 6000 miles per litre and after the first 4k miles of running in for the two new pistons, I am back to this level of consumption - which is unheard of for an ALPINA (most use a litre every 2k miles or so).
I am yet to put her on a rolling road to see what output I have now, but she still gives me 60mph in less than 6 seconds and the lepton appears at about 12 seconds - about the same as before.
About 10k miles after the rebuild, the gearbox went on strike so I have now had it rebuilt and replaced the shock absorbers too - so I reckon my 8 year old ALPINA with 190k miles on the clock is essentially as good as new and going just as quickly. Given that I plan to keep her for another 8 years / 180k miles, the investment should be a good one.
Now all I need is to track down Charlie at SRR and see how good the work has actually been
The crank was sent off for grinding but came back having only needed a light polish, which meant standard bearing shells were replaced. The cams were just as pointy as they were when first put into the engine and the cylinders received a gentle rub down to remove any sheen.
The head was skimmed and the exhaust valves received some attention to smooth the edges and guarantee a full seal - but apart from that, everything was stripped, cleaned and replaced.
Prior to the rebuild I was enjoying oil consumption at about 6000 miles per litre and after the first 4k miles of running in for the two new pistons, I am back to this level of consumption - which is unheard of for an ALPINA (most use a litre every 2k miles or so).
I am yet to put her on a rolling road to see what output I have now, but she still gives me 60mph in less than 6 seconds and the lepton appears at about 12 seconds - about the same as before.
About 10k miles after the rebuild, the gearbox went on strike so I have now had it rebuilt and replaced the shock absorbers too - so I reckon my 8 year old ALPINA with 190k miles on the clock is essentially as good as new and going just as quickly. Given that I plan to keep her for another 8 years / 180k miles, the investment should be a good one.
Now all I need is to track down Charlie at SRR and see how good the work has actually been
Good question.
Someone 'ahem' once forgot to get the timing belt done. Rather than pay the grand to get it fixed, my pal and I did it ourselves over five days. New piston rings, valves, valve stem seals, belt, tensioners, gaskets, bores honed etc. Once all back together and humming away nicely, never noticed any real difference.
That was a motor with circa 80k on the clock and two distinct amateurs having done the work. Car ran nicely after that and went through the MOT without any problems.
Oh and as a OT reminder to all....don't effin forget timing belts....
Someone 'ahem' once forgot to get the timing belt done. Rather than pay the grand to get it fixed, my pal and I did it ourselves over five days. New piston rings, valves, valve stem seals, belt, tensioners, gaskets, bores honed etc. Once all back together and humming away nicely, never noticed any real difference.
That was a motor with circa 80k on the clock and two distinct amateurs having done the work. Car ran nicely after that and went through the MOT without any problems.
Oh and as a OT reminder to all....don't effin forget timing belts....
Cunning Punt said:
Chuck328 said:
fair to say leaving it to amateurs as opposed to the processionals means you might have a chance?
It's fair to say it would be...unorthodox.
These blokes will spanner your broken M62B44, then take it out for some light exorcise.
'punt
bikemonster said:
Cunning Punt said:
Chuck328 said:
fair to say leaving it to amateurs as opposed to the processionals means you might have a chance?
It's fair to say it would be...unorthodox.
These blokes will spanner your broken M62B44, then take it out for some light exorcise.
'punt
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