Corsa piston build with throttle bodies

[pork]

So engine is trashed.....

All good though as I’ve just picked up a cga3de block and crank from dave shaw (thanks mate)






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[wehey]

What failed on the engine Neil?

 

[pork]

What failed on the engine Neil?

Liners are all glazed and out of shape


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[SuperUno]

I did wonder about glazing.

 

[andre_f_carvalho]

Have you put new rings?

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[pork]

Well hopefully this time with a cga block it’ll go better

New pistons abs rings on order too


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[pork]

Just got my cga3de block back, bored out and honed.....had to buy 4 new pistons too

Almost done polishing the head up, then il send that of to have the cr12 valves put in


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[frank]

did you bust apart the other block neil ? to check the liner thickness

 

[pork]

did you bust apart the other block neil ? to check the liner thickness

No, but I have got the old block back,

So can have a look later


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[pork]

Gotta get a move on now to finish the micra.......me and the old man are gunna build one of these now

Had a look round the factory today, amazing cars!

Gunna stick the ls3 engine in it too


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[l_jonez]

Haven't been on here for a while, shame about the engine but at least your still at it.

However those LS engines are incredible for their size etc

 

[pork]

Cheers dude.

Gotta see it through

Should be sending the head off for the valves to be fitted this week, got a tiny bit more polishing to do


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[pork]

Head and valves sent off
Gave them the crank and rods too, all the bearings got trashed as well,so new bearings ordered and crank polishing


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[pork]

Right......got all my bits back

Cga block re-bored/honed 3mm off the deck
New corsa pistons/rings
New main/big end bearings
Crank polished
Head diy port/polish, longer cr12 valves cut in, 2mm skim

I’ve got some cat cam springs coming too

Big dent in bank account

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[pork]

Got my valve springs through, so can rebuild the head

Longer valves so I don’t have to double up the shims, plus they’re under Cr12 buckets, so no chance of spitting them out

New cg13 clutch, fitted to cg10 spline.......should stop the grinding noise whilst engaging gear

...........and because I’m a ****ing idiot, and didn’t check the cc in the head correctly before skimming it, I’ve had to get a de-comp plate from Ferriday Engineering to bring the c/r back down to 12:1

It was nearly 17:1

If it don’t work, then I’ve wasted all that time and effort polishing that head


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[pork]

All built back up

Ran out of time to fit it, so will have to wait till next week


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[Agent_Sm1th]

Great work. Looking forward to you firing it up.

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[Low Rider]

Here's a port comparison for you Neil.

 

[pork]

Bloody hell

That’s a bit better than me and a dremmel


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[andre_f_carvalho]

With router cnc it's alote better

Bloody hell

That’s a bit better than me and a dremmel


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[Low Rider]

With router cnc it's alote better

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Expensive too.

 

[pork]

Well it’s alive again

Started up just fine

Now to do some gentle driving for a few hundred miles


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[pork]

Well it’s dead again, after 15 miles

Comp test showed 5 bar on all cylinders

Taken head off



Have some pics........

Pistons as I found them

Block to gasket face

Head to Decomp plate face

Gasket to Decomp plate face

Gasket to Decomp plate face

Cleaned up the pistons and can’t see any cracks/ damage

Is there any way of telling if the rings are trashed without taking the block apart (can’t be ****ed......again)



I’ve sprayed some brake cleaner until it pooled on the pistons....it didn’t drain away, if this means anything


Opinions, suggestions........criticism, all accepted and appreciated


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[frank]

how tight were the headbolts neil ? did they undo with a "crack" ?

 

[pork]

I over torqued them a bit


.......not all of them


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[frank]

was there any sealant on the metal-to-metal joint ? there looks like some emulsified oil under the decomp plate

 

[pork]

Used some wellseal jointing compound between plate and head as per instructions


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[frank]

and did the sealing compound survive, or disappear ? i doubt if its a ring or bore issue personally

 

[pork]

Well it looks a lot cleaner from when I put it on, the wellseal is red colour.

And the plate in pic was as I found it.


You reckon new head and just a gasket theb


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[frank]

i would try 2 old gaskets and see how it ran i guess mate, and if the compressions are back to normal then decide which way to go

 

[pork]

i would try 2 old gaskets and see how it ran i guess mate, and if the compressions are back to normal then decide which way to go

2 gaskets ain’t enough to bring the cr down. That’s why I git the plate

You think if I rebuilt it with a new head gasket and resealed the plate then over over torque it, it’ll at least let me do a comp test again


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[frank]

try that then eh, i would use proper screen bonding sealer personally, and let it tack off for an hr or so before fitting

 

[pork]

This stag wellseal no good then.

It’s what they suggested


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[pork]

Had a closer look at the head and plate today

I can see sort of faint ‘blast’ marks coming from the combustion chamber parts

I’ve cleaned up and re-sealed and put it all back together,

Hope get to comp test tomorrow, got called out so couldn’t try today


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[LiamC]

Good luck with it tomorrow

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[pork]

Had a quick go before work.

All cylinders went to 7bar

Put a smidge of oil down there, and went right up

Cylinder 1- 10bar

2-3-4 - 12bar

What does this mean then?

Cylinder 1 is trashed.

Or is it because I’ve only done 15miles on this fresh pistons/rings


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[andre_f_carvalho]

Can be, not really adjusted, and with the engine warm exist more proper seal

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[St0rm91]

Had a quick go before work.

All cylinders went to 7bar

Put a smidge of oil down there, and went right up

Cylinder 1- 10bar

2-3-4 - 12bar

What does this mean then?

Cylinder 1 is trashed.

Or is it because I’ve only done 15miles on this fresh pistons/rings


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Doesn't necessarily mean the cylinders trashed. Could be a worn cam or a bad set of rings. Edit: or a leaking valve.

 

[pork]

Well I’ve tried it again.........



Won’t start, compression gone down to 7ish bar


**** it !!!


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[r-reg-sr]

Don't give up on this one !!! we are all with you.

 

[pork]

Gunna buy a new head, ditch the plate.

Look at pistons

Done


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[andre_f_carvalho]

Have you check the timing? Or other minor things?

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[pork]

Had a spare hour today.

With old stuff I had:

Cylinder 1- 5 bar
Cylinder 2/3/4 - 7 bar

Tried a new head .......

Same results

Pulled out piston 1.......rings intact, bores look fine, hone marks still there,no signs of damage

Gunna pull engine apart, rebuild, start again


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[frank]

you hav,nt tried it without the decom plate neil ?

 

[pork]

you hav,nt tried it without the decom plate neil ?

I picked up a new head the other day, (cheers superuno )

so tried it with no Decomp plate

Still same comp readings


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[frank]

gotcha, maybe the liners are cracking mate

 

[pork]

After 15 miles

Hope not, what’s symptoms would I get with that?

All I’ve got so far is low compression and smoke from the breathers


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[frank]

the overbore might have made them too thin maybe ? then they crack and leak compression into the crankcase

 

[pork]

the overbore might have made them too thin maybe ? then they crack and leak compression into the crankcase

Thought beings I’ve used a cga3de this time, it’ll be ok, it’s only 0.5mm

Would of thought I’d if done the gasket or rings before the liners gave out

Il take a look once it’s in pieces again


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[frank]

just checked ebay for crack testing stuff, loads of drug related hits