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1275 Bmw K Head Conversion (k1275rs)


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#1 Sprocket

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Posted 04 July 2008 - 10:17 PM

Ok so its been a while since I have posted anything about this project. A lot has happend since last, infact, I have scrapped the original block and started again from scrach. I just was not thappy with the original one :techsupport:

MPi block. Deck completely plugged off for dry deck head assembly, using brass plugs and steel where new stud holes intersect. All new stud locations now have plugs fitted to ensure perfect full form threads.

Offset bored to line up cylinders perfectly center to center with the BMW head. Stud holes drilled and tapped to move the head forward on the block to line up the combustion chambers centrally over the cylinders. All that done on CNC to CAD drawings, so Perfect!

Steel liners fitted to return bore to standard 70.61mm and 1275cc.

Block skimmed so pistons sit flush with the deck.

Four bolt main cap fitted, line bored and honed.

Crank case machined for clearance of steel h section conrods.

Under crown piston oil cooling jets fitted, dry deck adapter fitted in a core plug location an back end of block to feed coolant to the head. All other core plugs have had 'safety' retention screws fittted.

Holes drilled and tapped into old tappet chest for oil drains for both head and the turbo in the very near future

Engine/ Gearbox bolts enlarged to mate.

Head modified to fit the A series block, as per normal plus all coolant passages welded up for dry deck assembly, adapters welded on back end for coolant and oil drain

Crankshaft Wedged, Bladed, cross drilled, Toughened, balanced to the nth degree.

Steel h section conrods modified to give propper clearance on little end with pistons due to the offset bore.

Hepolite 19320 Powermax Cooper S pistons machined for valve clearance. Total Seal gapless piston rings. Teflon buttons fitted to prevent fully floating wrist pins scuffing the bore.

Worn MPi cam shaft machined to remove all lobes except the cam sensor lobe to drive turbo oil pump.

Ultra light flywheel and backplate, orange diaphragm, and AP racing organic friction plate.


Final dry build done, final clean to do and then assembly.



I think that should do for now :shifty: More to come in the next couple of weeks as i build it up. Some of he pictures below dont show some of the machining as they were taken before. Just need to get this finished, ive been at it since Feb 2005 LMFAO :wub:

#2 Bungle

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Posted 05 July 2008 - 06:44 AM

thats 1 modified engine :wacko:

#3 tomkidd

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Posted 05 July 2008 - 08:22 AM

Awesome. Very interesting too. Can I ask why you went to 1275?

#4 Sprocket

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Posted 05 July 2008 - 08:42 AM

Awesome. Very interesting too. Can I ask why you went to 1275?


Offsetting the outer bores by 1.01mm without liners would require the use of +60 pistons, which would take me into class C at The British Mini Sowdown, and, 1275cc leaves me one overbore with the liners that have been fitted for when i fit the +20 pistons next year along with the turbo. I just didnt want anything bigger than 1293 and, for all intent in purpose, its a standard engine, which the insurance companys seem to be happier with. :wacko:

#5 BMC Paul

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Posted 27 July 2008 - 06:43 PM

Nice Spox !

#6 Sprocket

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Posted 30 August 2008 - 10:25 PM

Progres

the engine is mid build now. I have 16 valves and 32 collets to fit ;) The head on the block is just for lookie see if the hoses are right, Everything going well so far :)

No doubting that this is indeed a 1275 engine :)

#7 HARBER07

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Posted 30 August 2008 - 10:35 PM

Too late for anything to sink into my brain, but it looks the dogs' so far. Will have a proper read tomorrow though!

#8 RobG295

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Posted 31 August 2008 - 02:06 PM

Now that is one beatifully engineered engine you've got going there! I would love to do the K conversion one day, when ive got the time and money!

#9 Sprocket

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Posted 20 September 2008 - 11:10 PM

Been a while since I updated.

Pictures speak more than words. Any questions just ask :(

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#10 Bungle

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Posted 21 September 2008 - 07:32 AM

:dontgetit:

#11 mike.

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Posted 25 September 2008 - 12:26 PM

:D


What he said!

Looks amazing!

#12 Sprocket

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Posted 03 October 2008 - 09:40 AM

Loads of stuff to do still, but looking at next week end to get this in the car, allowing the following week to plumb it in and wire it up :D

Here are a few 'money' pics :P

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#13 AndrewJ530

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Posted 03 October 2008 - 06:04 PM

Looks sweeeeeet man!

#14 JamesRance

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Posted 04 October 2008 - 12:14 PM

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That is just Porn right there lol no other word for it, accept for awsome!


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#15 Rosslin Racing

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Posted 04 October 2008 - 12:27 PM

Awesome. Very interesting too. Can I ask why you went to 1275?


Offsetting the outer bores by 1.01mm without liners would require the use of +60 pistons, which would take me into class C at The British Mini Sowdown, and, 1275cc leaves me one overbore with the liners that have been fitted for when i fit the +20 pistons next year along with the turbo. I just didnt want anything bigger than 1293 and, for all intent in purpose, its a standard engine, which the insurance companys seem to be happier with. :P

who did the machining looks great? its going to be a monster for sure.
one thing would intrest me the old studs holes have been plugged and rebored to take the BMW head how were the holes pluged?




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