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Possible glazed bores?? 

 

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 Post subject: Possible glazed bores??
Posted: Tue Jun 05, 2012 3:59 pm 
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Hey, I've had a fully rebuilt engine dropped into my car and before I had it tuned it was running rich and 5 & 6 were fouling up plugs if it stalled, they only smelt of petrol, now it's been tuned and is running great but I pulled the plugs out and 4,5 & 6 are black with partial white, with oil up the top end of the spark thread, what could be the possible cause? Glazed bores or something else. Any ideas?
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 Post subject: Re: Possible glazed bores??
Posted: Tue Jun 05, 2012 4:19 pm 
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first thing i would be checking is compression...
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 Post subject: Re: Possible glazed bores??
Posted: Tue Jun 05, 2012 4:23 pm 
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TROYMAN wrote:
first thing i would be checking is compression...


I won't be able to check that until Sunday, as Im supposed to be taking it to heathcote Saturday, although it seems to still have a lot of power, wouldn't I know If the comps dropped
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 Post subject: Re: Possible glazed bores??
Posted: Tue Jun 05, 2012 4:45 pm 
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not really, but a comp test can give you some insight of whats going on..
but you can still have a bad oil ring without loosing compression..

how many kms since it was built??
how have you done the run in process??
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 Post subject: Re: Possible glazed bores??
Posted: Tue Jun 05, 2012 6:38 pm 
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I've done about 2000, and my brother done the run in, could the pre tune over fueling have cause it's to glaze?
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 Post subject: Re: Possible glazed bores??
Posted: Tue Jun 05, 2012 9:02 pm 
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EA-SPAC-88 wrote:
I've done about 2000, and my brother done the run in, could the pre tune over fueling have cause it's to glaze?

what type of oil was used to run in?

 

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 Post subject: Re: Possible glazed bores??
Posted: Tue Jun 05, 2012 9:03 pm 
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EA-SPAC-88 wrote:
I've done about 2000, and my brother done the run in, could the pre tune over fueling have cause it's to glaze?


It could have.
But something is wrong if the plug don't all look the same.
You need to work out why it only blackens some of the plugs.

 

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 Post subject: Re: Possible glazed bores??
Posted: Wed Jun 06, 2012 10:39 am 
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tickford_6 wrote:
EA-SPAC-88 wrote:
I've done about 2000, and my brother done the run in, could the pre tune over fueling have cause it's to glaze?


It could have.
But something is wrong if the plug don't all look the same.
You need to work out why it only blackens some of the plugs.


And why the oil is up the thread
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 Post subject: Re: Possible glazed bores??
Posted: Wed Jun 06, 2012 11:47 am 
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EA-SPAC-88 wrote:
tickford_6 wrote:
EA-SPAC-88 wrote:
I've done about 2000, and my brother done the run in, could the pre tune over fueling have cause it's to glaze?


It could have.
But something is wrong if the plug don't all look the same.
You need to work out why it only blackens some of the plugs.


And why the oil is up the thread


I wouldn't be worried about that right now. It's more important you find out why there is such a varriation between cylinders. Once you have fixed that you can start to worry about it having glazed the bores or not.

 

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 Post subject: Re: Possible glazed bores??
Posted: Sun Jun 10, 2012 2:45 pm 
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Well what I thought was that when it was over fuelling it was gradually worse from 4-6 and now it's tuned maybe began glazing which is causing the oil on plugs? But the thing being, the oil is only on top of the threads not the bottom
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 Post subject: Re: Possible glazed bores??
Posted: Mon Jun 11, 2012 9:23 pm 
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Well what I said was, forget about the oil on the threads or anything els until you work out why it's got such uneven fueling.

 

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 Post subject: Re: Possible glazed bores??
Posted: Mon Jun 11, 2012 9:33 pm 
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Vacuum leaks at the intake gasket??????

 

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 Post subject: Re: Possible glazed bores??
Posted: Mon Jun 11, 2012 10:50 pm 
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Could it be anything to do with the vac hose not being on the back of the rocker cover? Or the fuel reg??
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 Post subject: Re: Possible glazed bores??
Posted: Mon Jun 11, 2012 11:06 pm 
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EA-SPAC-88 wrote:
Could it be anything to do with the vac hose not being on the back of the rocker cover? Or the fuel reg??


The hose that goes on the back on the rocker cover is for the breathing...collects hot oil vapours, and goes down to the throttle body in front of the butterfly.
Not having a vacuum hose on the regulator will raise the fuel pressure in the rail at idle.....but won't do anything at say, 2,000 rpm and higher.

 

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