*UPDATED* I FOUND MY BOOOOOOOOOST!
Turbo Mini Forums

Hi guys,

Here's a strange one. When i came to timing up my engine build i discovered that the TDC mark on the pulley was nowhere near the marks on the timing cover i.e about 40 degrees out?
So i made a new mark on the pulley, Got No 1 TDC and painted a silver line on 0 Degrees BTDC. Job done!
Set up the ignition and fuelling and the engine bursts into life, except when there is any load on it (even pushing the clutch down) the revs fall away, it spits back through the carb and stalls???

The pulley is the old type, where the pulley bolts to the crank and the damper ring bolts to the pulley. Anybody know why it doesnt line up?

Ive advanced it upto20 degrees BTDC (by my marks) which has helped but am not sure whether to go any further?

Really need some help with this one?

Thanks

Karl

Edited by 1380turbo on 3rd Dec, 2007.

Your cam timing set right?

Sure is matey. Checked that again when the carb went poo.

Still havent found ya clutch plate

No probs. Got one coming.
If you need a hand, I'll pop up the weekend. Got to be something silly

probably yer, As sonn as you lift the clutch to engage 1st its pops then dies

if you are sure that the cam timing and ignition timing is correct you will find your fueling is light year out!

more than likley too WEAK!

But didnt you say the original mark was some 40deg out ?

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

If the timing mark on the pully has moved, Its goosed, get a new one soon or you may find a half kilo mass of steel flying around the engine bay

Hi,
With the woodruff key pointing straight up, you should be at TDC.
Mark the pulley and timing case, then set your ignition timing to these marks. Your problem may just be down to ignition timing being out, but then again....
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

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40 deg is a HUGE amount though.

Even without any fancy tools whatsoever, you should be able to identify a TDC pointer quite easily.

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

There is an A series pulley with the mark in a different position - I have one and it confused the hell out of me for a while. Never have worked out what it is from though!

I think I remember seeing an inline engine with the marks on the otherside of the engine.

although it could have been a maestro

Avonbar tell me thats the right pulley and that the old cooper S ones had the timing pointers in a different place.

Anyways thats sorted timed up at 4 Degrees BTDC and still has the same problems as described before. No amount of adjusting mixture helps weak or rich? Has no power or throttle response below about 3K RPM and is also a pain in the arse to start once its warmed up?

So what sort of timing are you seeing at 3000rpm etc ?

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

Hi,
Check tappets clearances
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

OK, couple of thoughts on this,

is the gasket between the plenum and carb ok? a few people seem to have got caught out with gaskets that have no hole to provide boost pressure to the carb dashpot chamber,

have you got oil in the dashpot? we've all done it LOL.

as its a bit sooty are the choke seals gone? i think it was bud666 that had a big prob with this a while back.

also its worth just swinging the dizzy about on idle until the engine runs fastest, this will get you somewhere near where it should be.

also have you got another coil, i had similar syptoms when i had on shat it self and i stuck a non electronic ign coil on. would start and idle but just fell on its face if you tryd to rev it.

My part throttle lean off pipe wiggled it's way off once and I had the exact same symptoms.

Any load or high revs and it would just cut out.

Have you blocked yours off? Just a thought.

In the 13's at last!.. Just

Ahhh some good things to check there guys cheers.

Mini13...Yes the gasket has the hole in it and the dashpot has oil. Ignition seems to have a strong spark.

Oneeyedlizard.....My part throttle lean off is as original (still connected).

Tappet clearances are good and at 3000RPM im seeing about 6-8 degrees of advance.

Checked all cam timing again tonight and all is well. Anybody in the essex area got a spare Turbo Carb in known working order?

Ta

Edited by 1380turbo on 29th Nov, 2007.

Hi,
You should have 6 at 1500 and about 20 @ 3K
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

ahhhhhh something to investigate.
Cheers Gavin

Karl

search for the T peice trick of turbo
daves
this may well sort the problem
then set the carb up
if not a compression test could reveal a blow head gasket,

if you have run the engine
between 2&3 bores

My engine alway ran fine when blown between 2-3. Of course it was noticeable, but still totally driveable.

But if he isnt getting decent timing at 3000rpm...something is badly wrong. Id expect closer to 28deg at 3000rpm.

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

Ok here is the update folks. Pulled all the bits n pieces off the carb to check the right gaskets were fitted and they were ok. Checked the dizzy and it advanced upto about 20 degrees but still no joy.

In desperation i swang the dizzy upto about 20 degrees @ 1500 which advances to about 30 degrees @ 3000. This seems to have cured it.

Does that sound like a lot of advance Stevie or is that ok? maybe i can still go further?

Been out for a spin and it pulls ok with no popping or backfiring...BUT............I have no turbo boost? It is a T3 straight from turbo technics so things to check please. I am not running an ECU so i have the T-piece from the impeller body blocked off on that side. Didnt push the engine much over 3K so is that high enough to get the thing boosting?

Engine spec is 1380 with Avonbar phase 2 cam and a hi-boost stage 4 avonbar head.

Think were getting there tho guys

Edited by 1380turbo on 1st Dec, 2007.