suck through turbo setup
Turbo Mini Forums

i am currently builbing a torbo kit for my mini i am an apprentice and am fairly poor at the moment and i am useing a turbo off a honda city and i am useing a standard 1275 so im guna lower the compression by useing 2 headgasgets and a 2mm spacer im geting laser cut i am proposeing makeing it a suck through turbo sistem and puting an auxilary electric fan and puting an oil cooler in the turbo oil feed line. i dont expect thes engine to last forfever its just anexperement i have 2 spare engines. any coments or helpfull advice will be appriciated

MINI King of the road

I wouldn't use a spacer/decompression plate, IMHO they're a bodge, you'd be better off spending the money on getting the chambers enlarged on your head.

Getting dished pistons is another optinon to lower your CR, but if your on a budget then head chambers would be your best option.

With regards to turbo selection im not that clued up on whats good and whats not but, one thing you need to consider is bolting it to the engine. e.g. what manifold to use? If your able to make one yourself then it shouldn't be a problem, if not it could dost some to get one made!

Its not critical to run an intercooler (if your only using low boost), but its well worth doing just for peice of mind, and it will help alot with the performance if the right one is selected and installed well!

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1/4mile in 13.2sec @ 111 terminal on 15psi

Suckthru is a poor excuse for not doing the job properly. You also need turbo seals upto the task - standard seals aren't. I've no idea what a honda city is.

If you want to do the spacer plate, then that is your shout. However, You will need to lengthen your pushrods to retain the barely acceptable standard geometry. Or, you could drop inserts into the followers to raise the pushrod up.

i'd never even considered pushrod issues when using a spacer, pretty obvious when you think about it though.

Sounds like an interesting project, but if budget is tight, unless you are a very good fabricator it'd be cheaper to go down the route of using standard metty turbo parts.

Have a read of this link, there's ALOT of good info in here that should answer alot of questions.

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=4724

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1/4mile in 13.2sec @ 111 terminal on 15psi

http://www.turbominis.co.uk/forums/index.php?p=vt&tid=9000

here you go thrashmiester .
this was an engine designed way back in the mid eighties ,it was a huge success and balistically fast for its time ,running a 7 second dead 0 to 60 with 3 people in and huge wheelspin ..

it ran 15psi and had a 1.8mm plate between 2 head gaskets , it never had a head gasket faliure ,ran 15psi with water methanol inj coming in at 7 psi on a simple washer pump .

it also never had the pushrods lengthened or anything like that ,just screw the tappets down a bit worked fine .

it did have a carbon seal type compressor seal so it could run vacuum on the turbo in let when shutting the throttle and so on . when i first helped with it it was running a t3 with no carbon seal just the normal one ,and i got the chap to put another butterfly between the turbo and the engine so the vacuum wouldnt pull the oil out of the comrpressor seal , this worked fine but was a bit complicated with two throttle cables etc .
regards robert
oh make sure you actually measure your compression ratio and work out what you need to do .

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

im planing to run 7psi boost. the advantage of being an engineering apprentice is iv got access to a laser cutter and all the engineering gear and knolege one could possably need so im makeing my own turbo manafold and inletinlet manifold my oil return will be into the blanking plate where the fuel pump somtimes is can anyone tell me how many cc the combustion chamber is on a 1275 cc non turbo engine is

MINI King of the road

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If your only planning on running 7psi I wouldn't bother lowering the CR at all form standard, 9.4:1. When lowering the CR it is a bit of a trade off, you loose power off boost but because you can run higher boost you gain on boost!

Im currently running about 10psi with a CR of 8.3:1 and quite honestly its painfully slow compared to when it was 9.4:1 on the same boost, just can't wait to get it on the rollers and set it up and wind the boost up. :)

If you use a 2mm spacer that gives you about 7.8cc + the extra gasket of say 3.5cc, the maths.

1275/4 = 318.75

318.75 + 11(piston) + 7 (2x gasket) head chamber 21.4 + spacer 7.8 = 365.95

365.95/ (11+7+21.4+7.8 )

365.95/47.2 =7.7:1 CR

TBH It really wouldn't be worth while for 7psi of boost!

If you've got facilities to fabricate parts that should help keep the costs down for other parts needed, but as for the decompression I would have a think about what you wan tout of the engine...A nice easy drive daily runner or something to take out on a nice Sunny weekend to cane about (within the speed limits of course.Lol)? :)

Edited by matty on 22nd Jun, 2007.

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1/4mile in 13.2sec @ 111 terminal on 15psi

do you think standard internals would stand up to 7psi without a drop in compression?

thanks for the maths matty iv been trying to work out wat my compression ratieo would be with that extra gasget and spacer.

evin if i dont lower the compression im going to take the head off and give it a recon and maybe a bit of porting work to get it flowing a bit better. the engine im useing is out of a woolesley 1300 i got given!! its only done 10 000kms since engine rebuild.

MINI King of the road

oh and yea this car in only guna be a suny weekend driveing car. not for everyday use thanks for all the helpfull info im geting geting guys its a great help

MINI King of the road

Bini blower if you're going to play like that. Also, for the rockers, you can hack a bit of the pedestals. Have to consider crush, etc. If you get the insides of the plate matched to the squish of the pistons/head, it will work well. Anyway, 7.7cr, that would take some welly :)

Bugger off, I'm getting there.