21268 g7 l33 piston dish,oil pump and 286cam help!
Turbo Mini Forums

Hello, im looking to convert my 1275 engine into a low boost turbo motor using a clutch mounted gt17 turbo. The engine is in really good condition and is fitted with a kent 286 cam, the pistons are marked 21268 g7 l33. Can anyone please tell me what size dish these pistons have and also what is the standard compression of this engine? Also would a turbo oil pump be needed or is the standard pump up to the job? As I may run it n/a for a while before fitting the turbo. Second to last question... will the kent 286 cam Be any good? Its not a daily drive but more of a weekend toy so not to worried about drivability as long as it makes good power when I need it, last question!... is a centre main strao going to be really needed for my set up? The reason I ask is because I have booked a week off work which I intend to work solid on the mini to try and swap the gearbox.fit the engine and make the manifold so dont want many hold ups.
I know some of my questions may sound silly but I really would appriciate your help and imput! Thanks!

I know for a fact that the 286 is going to be useless, best off selling it, buying something like an mg metro or 266 and pocketing the difference mate. Standard oil pump has been proven to be more than up to the job but the high flow item won't hurt if you feel like fitting it.

Ok brilliant thanks for the fast reply! Do you know if the 276 is any good as I have one laying round or again is that useless? What are your views on a centre main strap?

A 276 is better than a 286, but still not quite as good as something tamer, by all means you could try it and if you're happy with the results it gives continue to use it. There's no downside to fitting a cms, I'd fit one to any non standard engine just for piece of mind for the little cost involved

Ok mate thanks so much for your help! Still after some info on these pistons, can anyone help?! :) also after having a think im not sure if the easiest route is a bulkhead box.. what are peoples thoughts on this? Thanks!

you can get a gt17 down the back without a bulkhead box iirc

Yes i moved to the darkside

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On a mildly tuned or low revving set up the centre strap is not needed.

Ok thanks guys :) im at the stave where I need to start ording parts so dont want to miss anything :) I was planning to makw my own manifold but dontwant the turbo to sit silly close to th bulkhead, rather than completly remove that section of the bulkhead and box section has anyone just made the box section smaller to allow clearence for the gt17? Also I will be running a distributor.. will a standard metro turbo dizzy work with my set up or am I better locking a standard dizzy up to stop too much advance? I would like megajolt but for the time being money is tight. Thanks!

Can anyone please tell me what compression ratio the 21268 pistons give? Also if there a decent piston for a low boost engine, would be ideal if I was able to run low boost without touching the compression ratio

Having done the 286 cam 20 years ago with turbo....do not even bother. It's horrific.
SW5 or MG Metro and keep it simple, along with some higher lift rockers.

Centre strap a waste of money IMO, unless it costs you nothing, dont bother.

As long as the pistons have no big slots or cutouts, then they'd probably be ok as long as CR doesnt end up too high.

Just make sure you tune safely from detonation. That's the real killer.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

ok this is my tghoughts and take what you want but dont hold me responsible lol note beer..

the metro ran what 9.7 to 1? and 7-10 psi? with out an intercooler!

dont be sceared of compression on a low boost engine after all for a car to be fun to drive you want it to go when you stand on it not wait around or shift down!

forgett the main strap uses that cash towords a better intercooler!

like the other say get a better cam sell the ones you have to fund it if need be

a turbo enging is more about the state of tune ie fuel and spark to avoid damage

i cant stress enugh about a good intercooler that functions its free power! lower intake temps means you can run more compression and more boost with more safety

Thanks turbo this.. that was what I was hoping to hear! stevieturbo I think il leave the 286 now :) I do have a 276 would this work ok? Was hoping ti build the engine up this week with the time off work so unfortunately wont have time to buy another cam... or will putting the 276 in be a complete waste of tine? Thanks guys! Im slowly learning :)

Anyone advise the 276 or had experience with it? :)

I also may be able to get my hands on an n/a mg metro cam, are theses any good? How do I identifythe cam to make sure it is an mg metro?

right then first off search!

i often spend hours browsing random stuff..

i searched "cam identification" and found a few listings down this.

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=422303

i found this to help you out and i recommend you grab it if you can and sell the other cam for an inter cooler and related parts or head work or mappable ignition

ic and mappable ignition are probably the most bang for buck items i think besides cam and parts to get it a nice up to scratch engine and drive line/car

edit to fix and add

Edited by Turbo This.. on 12th Aug, 2014.