Getting an engine rebuilt for Scumball, before going the turbo-nutter route later.
It's getting skimmed and the compression is going up...
- How far can the the block/head be skimmed to increase compression without interference?
- Tim recently had grief with small end bearings after raising compression, I'll try and sort those too, but is there anywhere else that requires attention with higher compression ratio?
- I'm wanting a lighter flywheel. Is the M40 unit (3kgs lighter) a straight, bolt on swap? Can this be lightened further?
- Any other tips?
Cheers,
Omi
Rebuilding M42 high-comp...
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Omi
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...or is it?
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appletree
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think the best fly wheel to use is a 325 one IIRC you have to get some other bits to go with it but it is doable, theres a firm down bristol that will lighten and balance a flywheel for $35 though.
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
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m-dtech
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yep, m20 flywheel fits in the gearbox bellhousing
also might need to change the starter to the m20 one or swap the ring gear.
also might need to change the starter to the m20 one or swap the ring gear.
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tim_s
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what firm's that? im in bristol...appletree wrote:think the best fly wheel to use is a 325 one IIRC you have to get some other bits to go with it but it is doable, theres a firm down bristol that will lighten and balance a flywheel for $35 though.
omi, my CR is nearly 11:1, and i need steel backed small ends as standard bronze ones couldn't take it it seems. on a standardish engine i really don't know.
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appletree
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sorry tim seams there not in bristol, don't know were i got that from.
also prices seam to have gone up slightly 0r are miss quated in there advert in Practical Performance Mag as they advertise ltn flywheel + resurface £35
heres a link anyway
http://www.mspd-engines.co.uk/machining_page.htm
also prices seam to have gone up slightly 0r are miss quated in there advert in Practical Performance Mag as they advertise ltn flywheel + resurface £35
heres a link anyway
http://www.mspd-engines.co.uk/machining_page.htm
You should never underestimate the predictability of stupidity
M42 Supercharged 285bhp + M3 6speed box
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stuartgallafant
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omi, depending on what engine it is, will be how afr you can go...
tell me what engine it is, and i'll get you the data you need. its all supplied on the TIS computeras at work, and gives you info on the machining limits and such
tell me what engine it is, and i'll get you the data you need. its all supplied on the TIS computeras at work, and gives you info on the machining limits and such
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benjy
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Could you send me that info for the M42 an M44 engines pls?? cheers benjy 
Gaffa tape is like "the force" - it has a light side, a dark side, and it holds the universe together.
There's nothing that shouts "Poor Workmanship" more than wrinkles in the Gaffer tap
There's nothing that shouts "Poor Workmanship" more than wrinkles in the Gaffer tap
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stuartgallafant
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benjy, i'll get as much as i can for you both