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Post by miniandmodels on Nov 17, 2008 22:48:45 GMT 1
Engine re-bore is normally around the £80 mark. A complete engine re-build is expensive due to the amount of hours involved. Best bet is to buy a haynes manual and give it a go yourself.
Jamie......
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Nov 17, 2008 23:23:52 GMT 1
i paid £50 for my re-bore but then the pistons cost £188  as long as it doesn't need any other work, crank re-grinds etc it should be relatively cheap and easy work if you have a socket set and torque wrench. gaskets will come to something like £25 I've had allot of work done in the past by Lyon's engineering in brynmawr. it might be worth giving them a ring see what sort of prices they charge for a whole rebuild. all the work I've had done has been to a very high standard and well priced |
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Post by dai9fxey on Nov 17, 2008 23:32:53 GMT 1
Ahh yes, the pistons. Not at all cheap nowadays, even for a standard set.
Start looking on ebay for a set of +20 thou or +30 thou.
Depends how bad the bore wear is.
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Post by biker on Nov 17, 2008 23:45:10 GMT 1
i will be building a new one in the new year you can come up the garage and do yours the same time if you want ;D ;D
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Nov 17, 2008 23:47:59 GMT 1
you would need a bore gauge to be acurate, which are expensive. when its striped i'd take it along to a engine builder and they will be able to tell you which size you'll need. when i had my 998 done the +40 pistons worked out cheaper than the +20 ( which i could have got away with)  so thats what i went for. |
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Post by dai9fxey on Nov 17, 2008 23:54:28 GMT 1
The bores wear in different ways. Sometimes the bores are ovalised. Only an engineering shop will be able to determine (properly), accurately the amount of wear in a bore. I used to have my old rally engines bored an extra couple of thou to allow for heat expansion and to stop the pistons "nipping" in the block. Yes, it used a bit more oil, but hell, could it rev it's head off.  |
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Post by dai9fxey on Nov 18, 2008 0:07:38 GMT 1
Lj and I haven't started yet. Have you not heard of PISTON SLAP.?? |
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Nov 18, 2008 0:17:04 GMT 1
Have you not heard of PISTON SLAP.?? i like a bit of valve bounce myself  |
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Post by dai9fxey on Nov 18, 2008 0:20:06 GMT 1
Harmonic Vibration has a nice ring to it as well.  |
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Nov 18, 2008 0:27:33 GMT 1
I've heard crank fatigue can be painful, not experienced it my self but I've been told its common in older units ;D
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Post by dai9fxey on Nov 18, 2008 0:34:30 GMT 1
If you require extra lift you could go go for 1 : 5 ratio rockers.  |
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Post by princessamy on Nov 18, 2008 0:38:00 GMT 1
tut tut tut ;D
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Nov 18, 2008 0:40:34 GMT 1
any one know how i can check my ring volume ;D ;D ;D
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Post by dai9fxey on Nov 18, 2008 0:40:52 GMT 1
You could, of course have an offset grind and go for a short stroke. |
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Nov 18, 2008 0:55:59 GMT 1
personaly i like a short stroke but i've been told a long stroke is better, i've tried both and they both did the job ok.
i think a big bore with a short stroke is the best all rounder
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Post by dai9fxey on Nov 18, 2008 21:16:39 GMT 1
Too true LJ. Don't forget to lap your flywheel on to the crank tail using a fine grinding paste. You get a nice snug fit and it stops the crank fretting. |
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ljonez
turbo
Built not bought
Posts: 3,734
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Post by ljonez on Nov 18, 2008 22:08:06 GMT 1
think i may have deviated a bit with my posts yesterday ;D
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so thats what i went for.
