Rebuilding a 4.6 V8

[netercol]

just out of interest , is that not a alusil block? or is it being refitted with bore liners?

 

[moranor@axis]

just out of interest , is that not a alusil block? or is it being refitted with bore liners?

It is being resleeved... will let a1exander elaborate more on it...

 

[Redline]

Not much wall thickness between those cylinders is there?
Looks awesome thou!

Saw that.

 

[Peter@AEW]

The block is alusil and is being fitted with liners.

Now the search begins for rings as the standard rings will not seal or so I am advised although I have not exhausted my search to verify.

We are equally not willing to pay the agents the ridiculous price they are asking for rings or bearings for that matter.

 

[Gizmo]

Why won't the std rings work if you keeping std bore? Measure the ring gaps of the rings in the new sleeves, if the ring gap is too large then get oversized rings and re-gap them.

 

[Donna]

I wish you well guys.You rebuilding a monster there.:thumbs:

 

[Peter@AEW]

Why won't the std rings work if you keeping std bore? Measure the ring gaps of the rings in the new sleeves, if the ring gap is too large then get oversized rings and re-gap them.

I am trying to research the material used in alusil bores as opposed to spun iron bores.
By way of example the M88 and S38 use chrome molly rings and the M62Tu stainless as I have been told.
Equally a stainless ring is to aggressive for a spun iron bore and although it will seal it will wear (the bore) quicker over time.
I am trying to make sense of all that so your input would be most welcome.

So the idea is to use a "standard ring" but not necessarily a BMW v8 ring.

 

[rick540]

Why won't the std rings work if you keeping std bore? Measure the ring gaps of the rings in the new sleeves, if the ring gap is too large then get oversized rings and re-gap them.

I am trying to research the material used in alusil bores as opposed to spun iron bores.
By way of example the M88 and S38 use chrome molly rings and the M62Tu stainless as I have been told.
Equally a stainless ring is to aggressive for a spun iron bore and although it will seal it will wear (the bore) quicker over time.
I am trying to make sense of all that so your input would be most welcome.

So the idea is to use a "standard ring" but not necessarily a BMW v8 ring.

I am glad you are researching the materials as the stock pistons are also specially coated in the stock application and there are a number of considerations.

1) Nikasil uses steel coated aluminium pistons to prevent same metal running on each other (cant be done)
2) Alusil uses nickel coated aluminium pistons

These V8's, as I have read in technical documents used aluminium primarily as part of the design for cylinder wall heat dissipation ability and to allow much tighter bore clearances than typical. With steel liners you will have to open up the clearances.

With the steel liners the engine will actually sound different (I have heard)

There are three ring materials that are typically mixed, these are indicated but three numbers such as 777 or 776 etc but if you use steel liners it will make it easier just the top ring will probably need to be chrome or nitrided due to the amount of heat that is generated, moly would not the best choice. Middle and oil ring you can use anything you want including cast iron for the middle ring if its a steel liner.

I know the combustion in these engines generates enough heat to require special material exhaust valves so this would apply to the top ring as well.

I know KS sells Alusil liners that would allow you to use the stock pistons if you can get hold of them

 

[Peter@AEW]

Moving along

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The heads had been re built recently I suspect before the car was bought.

The caps on the camshaft are orientated and they can only fit correctly on their saddles.

Whoever assembled the heads mixed 4 of the caps and this is the result of caps on wrong saddles.





When we first looked at the motor on the back of Shaun's bakkie we noticed that there was a lot of wear on one of the cam journals and caps and saddles.
On the cursory inspection we thought that it was as a result of the chains slipping and the oil pump being affected.
Whilst doing the first dry assembly run we noticed that the caps when oriented correctly did not match the wear of the saddles so we went back and re-matched to wear patters.
That is how we discovered that whoever had previously assembled the heads made an error with some of the caps.

 

[Andy1GP]

raise: Wow what a wealth of knowledge. Such meticulous work Peter, massive respect!

And respect to Rick for imparting invaluable knowledge like that.

Great to see you guys are saving this motor one step at a time. :bravo:

 

[Andrew]

Hi .... Looks good .... Did they weld and line bore the cam journals for the repair?

I had oil pressure issues on my '01 740i a few years back. I had a suspicion that the oil pump bolts had worked loose and after I dropped the sump this was confirmed. I pulled a few of the bearing caps but luckily there was no damage. Car still running good 60k later ( still in touch with new owner )

Enjoy the project ..... It's like Lego for big boys :rollsmile:

 

[Gizmo]

I have 1x M62 and 3x S62 heads it you need some spares, btw will S62 heads fit on this block?
Great job so far guy!

 

[Peter@AEW]

Warren thank you.
I shall try and make an appointment with you when you are not busy (hopefully before 2016) and come past so that I can raid some of your spares stock.

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Hi .... Looks good .... Did they weld and line bore the cam journals for the repair?

I had oil pressure issues on my '01 740i a few years back. I had a suspicion that the oil pump bolts had worked loose and after I dropped the sump this was confirmed. I pulled a few of the bearing caps but luckily there was no damage. Car still running good 60k later ( still in touch with new owner )

Enjoy the project ..... It's like Lego for big boys :rollsmile:

You could weld and line bore if the heads were massively damaged on all journals however the engineers felt that some water paper and new caps would do the job equally well.

So I took my time and smoothed them out.

We will try and get a proper picture of the damage to the oil pump gears after it ingested aluminium fillings /steel from the camshaft and plastic from the guide rails.

 

[Andrew]

Cool ...... I am following the progress with interest and looking forward to the stage when you get to the vanos timing

 

[Pho3niX90]

Wow... Things are moving along, wish I could get the previous owner or whomever did the heads so that I can strangle them..

Couldn't have taken the engine to anyone better, Peter and his son really know what they are doing and always keep me updated.

Sent from my GT-N7105 using Tapatalk 4

 

[Andy1GP]

This is why I joined Epic stuff raise:

 

[Peter@AEW]

Cool ...... I am following the progress with interest and looking forward to the stage when you get to the vanos timing

Vanos timing I do with my eyes closed.....well almost as I have the CAM setting tools to time it.
I was forced to buy it to do my wife's car and I am still moaning about the cost.
I agree with you cam and vanos timing really looks impressive and as though one knows what one is doing.

If only one would torque correctly :roflol:

 

[Crash_Nemesis]

Peter. You're a legend man.

We must talk about my rebuild etc. Almost ready to go ahead with it.

 

[sash]

Great progress Peter.

 

[Peter@AEW]

Peter. You're a legend man.

We must talk about my rebuild etc. Almost ready to go ahead with it.

Chris as soon as we are finished with the 2 engines as I have both of them in the garage and no room to move.

We are looking forward to that build as the SC will then be able to run.........epic!