ATT JUKKA
Turbo Mini Forums

hi jukka got my 1380 on the road now as you may be a aware, every thing is going great except for a problem at 4k after a good thrash, any way spoke ray at my rolling road and he recon it may be 2 things, one my t piece before the pump may be a problem .

what is yours like, he recons a y piece would be better as then the return wont intervene with the flow.

i have a normal sized outlet from the tank wich i think is 6mm id.

what outlet size is yours.

cheers in advance, from another 1380 turbo guy.

always looking for them bigger bunches of bannanas

I have normal steel t-pieces, both for connection between the tanks and return line to pump inlet line.

Outlet from lh tank is std sized, probably even the gauze is still there. RH tank was homemade and most like has either 6 or 8 mm outlet. I can measure it later if you wish.

Did I send you the pics a few months ago ? If I did, you can see that it is not that pretty but works.

What kind of problem are you talking about ? Does it rev at about 5500-6000 prm in every gear ?

i'm also using a T piece return like the pics jukka sent me. standard outlet on the tank aswell. i havent had any problems with it at all.

he is what i put in the other post.

funny that mine has shown a misfire at about 4-4.5k but only after a good burst of boost say 7 psi then when it reaches this point it will miss fire , of boost perfect on boost perfect until it reaches 4-4.5 k again, i thought it might be the plugs getting to hot so changed to a set of bp8es insted of 7's that did make it a bit better but it still exsists,
mind you i am running slightly higher cr than most at 9.8.
this problem didnt show on the rollers as it would take time for it to apear.
but my fueling was checked static at 4psi my feed pipe to pump is standard size eg 6mm with a 8mm return.

ray didnt see any lean out on the rollers but as said before they could have been enough fuel in the float bowl so it wouldnt show.

or may as said before could be the valve seat letting extra fuel passed.

im miffed also will have to ring ray at the rolling road to see what he thinks.

ill also let you no how i get on.

any way spoke to ray he recon it may be to rich when it has been on boost to long and recommended lean of a touch first, dont no if i like doing that with out being on the rollers.

i have a largish universal filter prior the t piece which has 8 mm outllets, do you think this may be the problem, i have no other filters in the system.

ill post a pic off t piece later

always looking for them bigger bunches of bannanas

it will rev on low boost past 4 4.5k but on say 7 psi it will rev put after a period of time it develops a mis fire at 4-4.5 k but off boost she runs fine back on boost fine until i hit this point , its namely in 3rd and 4th.

always looking for them bigger bunches of bannanas

If the t-piece setup would create problems at 7 psi it would do it everytime. Since it sometimes works and then not the problem is most likely elsewhere.

One thing that differs between rollers and road is the bonnet. On rollers it is usually kept open and heat dissipates easier. On the run you have closed bonnet and under bonnet temps may rise pretty quick. It may heat the carb and cuase problems. Do you have vent holes in the bonnet. I did not have holes back in 1996 and on the very first run the brakes were automatically applied. The brake line ran in std location behind the engine and got warm in about 15 miles. Heated brake fluid expanded and caused the rh caliber to start dragging the brakes. Easy fix was to let the pressure off from the bleed nipple but after a few occasions it was drilling time. No more automatic braking...

It is most likely illegal but how about running without bonnet to see if the problem appears.

Do you have the heat shield underneath the carb ?

just a thought !!!!

have you changed the coil?????

ive got vents every were rs turbo vents plus 1 right above carb opening facing the windscreen.

ive just readjusted the fuel regulator 3.5 psi, no differnce, tried pulling out choke slightly made it worse, so i fitted the fuel presure gauge and took it for a spin found no problems in fact it didnt do it with the gauge fitted , ( bloody typical).

but i did put the co meter on and found the co was reading about 6.5% on tick over so later i may weaken buy a turn and a half like ray said and try that.

ray recon it may be a bit to rich, he didnt want it to run to lean with a high cr but it do it even on 3 psi at about 4.5 5 k so im thinking a long 2 much fuel beacuse it feel like you had just pulled on the choke, plus i got a wiff of petrol from the breathers when it done that which would signal two much fuel and getting some blowby past the pistons.

on one attempt it doen it i turned the engine of and checked the plugs but they looked ok but to be fair i dont think i let it go long enough to show on the plugs.

but i havent got a heat shield under the carb yet
but surley this would efect it all the time once the carb got hot if you get my drift. plus even after a good thrash and a puddle along a 30mph road for a mile to my house the carb still feel nice a cold, then again it could be that a bit of carb icing as its not that warm out here yet but hey im not sure about that one.

always looking for them bigger bunches of bannanas

What do you mean about the coil benross do they cause this when they need replacing? (sorry to butt in but i didnt know how faulty coils occur :) )

Previous Engine: 1040cc Morespeed engine, 1275 turbo head T2 Turbo Mirage Manifolds Megajolt
Previous engine: STD metro turbo, megajolt
Drives: 399bananahp (flywheel) Honda Civic Vtec b18c4 T28 Turbo 1968 Mini

Megajolt maps to download: http://www.jamesfawcett.co.uk/cms/index.ph...&gid=3&Itemid=3

feeb

inside the coil are windings like in an electrical motor

theres one winding inside the other without going into detail its these winding wires which short out break down

they may last years or simply give up the ghost at any time causing say a totall ignition failure or a intermittent ignition failure

hence your motor wont run or misses like hell

usually this is the first avenue to try

hope this enlightens you feebes

has the mini been parted with yet buddy ?