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Home > Help Needed / General Tech Chat > Wiped center main bearing

Joe C

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12307 Posts
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Carlos Fandango

Burnham-on-Crouch, Essex

lol,

point made carl...

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



fastcarl

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6965 Posts
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Fastest A Series Mini in the World

leeds/wakefield.




On 27th May, 2009 mini13 said:
lol,

point made carl...


and you thought Castro and Hitler could talk,lol

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE


Sprocket

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Preston On The Brook

lol still not any closer to finding the reason then lol

I had the center main line bored,and all the mains line honed, and as I said in the first post, the engine without rings turned with finger and thumb

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


paul wiginton
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5933 Posts
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9 times Avon Park Class C winner

Milton Keynes

Carl, yes that was long.

How many miles had Don done? 4 - 500? Colins done 1200 could that be the difference.

I killed mine in about 100 miles as the centre main was a bit tight

Paul

I seriously doubt it!


fastcarl

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6965 Posts
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Fastest A Series Mini in the World

leeds/wakefield.

well i think the centre main has failed on the dyno and the drive home has finished it off, simple as that,

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE


Joe C

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12307 Posts
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Carlos Fandango

Burnham-on-Crouch, Essex

any chance the car had some det on the rollers?

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Sprocket

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Preston On The Brook




On 27th May, 2009 paul wiginton said:
Carl, yes that was long.

How many miles had Don done? 4 - 500? Colins done 1200 could that be the difference.

I killed mine in about 100 miles as the centre main was a bit tight

Paul


From the rebuild, the engine has done 300 miles. all parts were from the original build and were perfectly servicble and showed no signs of failure after 1200 or so miles even with shitty oil pressure and high oil temps.

One thing I forgot to mention is that I used Millers CTV oil for the first time, so thats £40 wasted, lol

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


Sprocket

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Preston On The Brook




On 27th May, 2009 mini13 said:
any chance the car had some det on the rollers?


*laughing*

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

no, seriously.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Joe C

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12307 Posts
Member #: 565
Carlos Fandango

Burnham-on-Crouch, Essex

no, seriously.

On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Sprocket

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Preston On The Brook




On 27th May, 2009 fastcarl said:
well i think the centre main has failed on the dyno and the drive home has finished it off, simple as that,


Dont know if you seen it, but here it is again. This test run was the 85 at the wheels. the next run was the power run, and it showed 65!!, we let it cool and managed 73

http://www.youtube.com/watch?v=e80LZgyQqIo

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


paul wiginton
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5933 Posts
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9 times Avon Park Class C winner

Milton Keynes

I think Sprockets just fucking useless and cant build an engine properly. LOL

Paul

I seriously doubt it!


Sprocket

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Preston On The Brook




On 27th May, 2009 mini13 said:
no, seriously.


The ECU has knock retard, the engine can take +4 degrees advance from MBT without any sign of knock but power suffers dramaticaly, the engine is only ever run on V Power with a reasonably low compression for the engine, fueling and ignition were optimised previously, logs show coolant and air temps were normal, igniton and fueling also showed as optimised.

If this engine knocked, i would have known about it

It did not suffer det :thumbsup:

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


Sprocket

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Preston On The Brook




On 27th May, 2009 paul wiginton said:
I think Sprockets just fucking useless and cant build an engine properly. LOL

Paul


Probably right lol

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


chinlesswonder

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In the garage......again!!

what happened around 2.14 in the vid?

133.5 bhp 123 lb torque 116mph @6640rpm 9.5psi
Shakespear RWYB 14.995 91.83mph


fastcarl

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Fastest A Series Mini in the World

leeds/wakefield.




On 27th May, 2009 Sprocket said:



On 27th May, 2009 fastcarl said:
well i think the centre main has failed on the dyno and the drive home has finished it off, simple as that,


Dont know if you seen it, but here it is again. This test run was the 85 at the wheels. the next run was the power run, and it showed 65!!, we let it cool and managed 73

http://www.youtube.com/watch?v=e80LZgyQqIo


i think even with out viewing the vid you know the answer as the power loss it clear, the dyno opperator should have felt the nip and if he did and said nothing he's a bit naughty,


carl

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE


Joe C

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12307 Posts
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Carlos Fandango

Burnham-on-Crouch, Essex

fair enough,

i was just thinking of a smokey yunick theory about det ruining bearings,

how high did the oil temp get with these bearings on the previous build?

sorry for all the Q's just brainstorming really,


On 28th Aug, 2011 Kean said:
At the risk of being sigged...

Joe, do you have a photo of your tool?



http://www.turbominis.co.uk/forums/index.p...9064&lastpost=1

https://joe1977.imgbb.com/



Sprocket

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11046 Posts
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Preston On The Brook




On 27th May, 2009 mini13 said:
fair enough,

i was just thinking of a smokey yunick theory about det ruining bearings,

how high did the oil temp get with these bearings on the previous build?

sorry for all the Q's just brainstorming really,




The gauge scale maxes out at 120, I only ever seen oil temps as high as that for short period on the dyno when mapping. it ran 110/ 115 only when you gave it a good thrashing

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


scooperman

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Member #: 2234
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Palm Beach Gardens, Florida

I would guess that you experienced an imbalance that could not be felt while on the dyno. When it gets bad enough the center of the crank oscillates. You should have this crank checked for straightness now. Can you comment on how, and how well, the rotating and reciprocating parts were balanced? Were you using a stock or modified harmonic damper?


evolotion

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Glasgow, Scotland

the engine i ran at avon last year had a stiff main bearing, the engine was impossible to turn by hand unless a bar was used with just the mains torqued up, as a "new" bottom end is £50 for me i didnt really give a fuck about it and kept running it. eventually retiring it after cracking a piston ring land. the bearing was heavily"polished" (can get pics if you want!?) but otherwise was ok. your problem is more likely to be down to oil starvation or a foreign object IMHO :) but most likely oil starvation. the centre main feeds 2 big ends on the A where as the other mains only feed one?(hope im right, been a while) so if the crank rotating is pumping oil put to the big ends by centrefugal force, the centre main has twice the flow leaving it than the outer mains do. so if there is interuptions in the flow itll suffer first. just a thought!

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.


Sprocket

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Preston On The Brook

Crank was balanced as far as the machine can measure, on the fine setting. Pistons are all within 1 gram of each other. I would hope that the rods are correctly balanced end to endas they are H section from a well known source, they are all the same weight, but that is not what matters, i know. The crank damper is the standard MPi item, with the trigger wheel fitted to the outer edge.

I have never been happy with the flywheel being a JokeSpeed job, it took some balancing and the one I had prior to this one needed metal adding

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


Sprocket

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Preston On The Brook




On 28th May, 2009 evolotion said:
the engine i ran at avon last year had a stiff main bearing, the engine was impossible to turn by hand unless a bar was used with just the mains torqued up, as a "new" bottom end is £50 for me i didnt really give a fuck about it and kept running it. eventually retiring it after cracking a piston ring land. the bearing was heavily"polished" (can get pics if you want!?) but otherwise was ok. your problem is more likely to be down to oil starvation or a foreign object IMHO :) but most likely oil starvation. the centre main feeds 2 big ends on the A where as the other mains only feed one?(hope im right, been a while) so if the crank rotating is pumping oil put to the big ends by centrefugal force, the centre main has twice the flow leaving it than the outer mains do. so if there is interuptions in the flow itll suffer first. just a thought!


My thought as well, but why the pulsing oil pressure?

New oil pump on order anyway

On 26th Oct, 2004 TurboDave16v said:
Is it A-Series only? I think it should be...
So when some joey comes on here about how his 16v turbo vauxhall is great compared to ours, he can be given the 'bird'...


On 26th Oct, 2004 Tom Fenton said:
Yep I agree with TD........


carl talbot

326 Posts
Member #: 1323
Senior Member

did the brgs turn
is the crank cross drilled


MONSTER HEDGEHOG

280 Posts
Member #: 4340
Senior Member

sideways, Birmingham

this makes an interesting read, however no one seems to have mentioned the gearbox O ring as a cause.

if ive read this correctly your saying that you spoted one on the floor after the engine was fitted back in the car ? was this a used one or a new one that was going to be used?
ive had a few leaky engines and the sure sign that its low on oil is when the gauge pressure starts pulsing.. i belive this is due to the pickup pipe sucking in air as well as oil as its not fully submearged.
if you didnt have the O ring fitted then my guess is that it may well have been pulling air past the block to box gasket (if you ran one) and starved the engine of oil to a degree.

from my experiance the centre main is a weak spot on the A, ive killed two 998s on this from sustained high revs on cheap oil (motorways and 3.7 FDs dont mix), in both cases the bigend bearings on 2 and 3 were fine.

i may have just made a tit of myself , if so il quietly go and sit in the corner *blush*

Edited by MONSTER HEDGEHOG on 28th May, 2009.



On 15th Dec, 2009 fastcarl said:
sell the lot to me for £70 pounds and i'll let you stand on the outside edge and look on my inner circle of closest frinds, lol


carl




FOR EVERY WELL THOUGHT OUT AND WELL EXECUTED PRICISION JOB EVER CONCIEVED, YOU CAN GUARANTEE THAT SOMEWHERE IN WALSALL OR THE BLACK COUNTRY THERE WILL BE A BLOKE TRYING TO ACHIVE THE SAME BY MEANS OF "ITIN IT WI LUMP AMAR"


Nic

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First mini turbo to get in the 12's & site perv

Herefordshire



(in a Gail Platt stylee)

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