1380 turbo cyl head
Turbo Mini Forums

what chamber size
what valves

I was going to use the n/a mg head and open the chamber too about 30cc and use the n/a mg cam what do you think

1293 Turbo mini

theres many options jimmy

but the most popular sizes are 35.6mm inlets 30 or 31 ex if the valve seats are us!

minispares 214N racevalves give excellent results for the money

the cam choice is good too.

only my oppionion though.

Edited by BENROSS on 7th Mar, 2006.

Chamber cc depends on what compression ratio your after. For example if you used the 18cc dished pistons in a 1380 which were flush with the deck at tdc and used a bk450 head gasket (2.8 cc compressed volume) then a 30cc head would give you 7.78-1cr.

Edited by T3Tone on 8th Mar, 2006.

-MINI CLUBMAN 1380 TURBO-

I was going to use
head gasket bk450
Omega Pistons 73.5mm 11cc dish 1.426
mg n/a head chamber ? (the valves 214n from minispares)
std turbo crank & rods with arp rod bolts
turbo t3 with cos I/C

Edited by jimmy on 8th Mar, 2006.

1293 Turbo mini

from my calculations that would bring it to somewhere round the 9.5 - 9.6 :1 CR area.
dependant on how close the pistons come to the top of the block. if the pistons come flush its over 10 : 1! :S

i had trouble with high CR too but benross modded the chambers in it this time round and its about 8.5 : 1 now, i found the 1380 to drive very nicely on low boost with high compression, had some kick before the turbo turbo kicked in, and plenty more afterwards! but im after a bit more power now so the CR had to come down.
steve

Edited by hippyinamini on 8th Mar, 2006.

doh! why did i start messing with it!

so if i had 25cc chamber in the head would it be about 8.0 8.5 then

1293 Turbo mini

ive got 28cc in the chamber but my pistons come almost flush and im on about 8.5 : 1, havn't had it back on the road yet since the changes to the engine so i cant coment on how well it drives now

28cc would probibly give you low to mid 8's CR
steve

doh! why did i start messing with it!

cheers

1293 Turbo mini

don’t fit 11cc dish pistons the CR ratio is not the best you would only be able to run around 6ish psi of boost

go for the 18cc dish pistons. These together with the chambers opened out to 28 to 30 cc together with a well set up engine will give you 170 to 200 hp +

but a larger or more efficient intercooler would certainly be more beneficial

dont get me wrong the cossie 2WD is good but... giallofly upgraded from this & Squeezed a 4WD cossie one in & gained a whole 30BHP

dont for get the magic Exhaust elbow to fully compliment your spec will you!

I`ve got 4x4 cos I/C & got the manflow down pipe

1293 Turbo mini

its the modded Exhaust ELBOW you need which is part of the T3 turbo housing

which couples the maniflow exhaust

what this one ben
LMD681 Down Pipe For Mini Turbo System. ( manufactured with lower swivel joint)

1293 Turbo mini

thats the one you want if its made by maniflow!

this is the modded elbow

is the modded elbow a std elbow die grinded out or is new unit ?

1293 Turbo mini

bored out or die grinded

I have one of these, Benross kindly did it for me.

are you going for the 1380 turbo tom or the safe 1293 turbo ?

1293 Turbo mini

The "safe" 1293 turbo.....

Already built and in the car.

nearly there tom
i would like to add pete that toms motor is excellent!

the attention to detail is, well second to none

get moved in & away you GOooooooooo...

I think I'm running the "unsafe" 1293