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3.8 engine rebuild - who and how far to go?!

Ok sorry, I missed that, I thought the question was should he do both banks or just the one which was scored.
 
As others have said Hartech all day and get it diagnosed by them also. As we have seen in the past, one man's borescore is another man's sweet as nut, drive it like.you stole it.
Fingers crossed it's a misdiagnosed score and you've got a hefty discount for nothing :thumb:
 
SimonBash said:
And experiences/insights are useful.
Click to expand...

My engine was fully rebuilt at 49k due to borescore at Jaz Porsche, it's now on 65k, is purring like a kitten, and doesn't use a drop of oil between changes (6k miles). Whether it's going to need a rebuild again sometime soon due to scoring because it didn't have the 'Hartech treatment' remains to be seen, but I drive it with full confidence and enjoy every single mile :)

If it scores again, where would I take it? - Hartech of course, for a few reasons, but just giving my experience so far with a rebuilt engine from Jaz Porsche.
 
T8 said:
If it's only got light scoring on 2 cylinders are you going to run it until it actually needs something doing. :?:
Click to expand...

Absolutely this. Drive the car for a bit and see what it's like. If it's ticking and drinking oil then you might want to expedite the repair. The worst that will happen in the meantime is worsening of the scoring. Be very happy that you've got enough cash off the purchase price to get a rebuild if it's needed.

If the engine is out anyway, I'd probably go for a full 6 cylinder re-line. Not sold on the merits of a 3.8 to 3.9 conversion. The extra money is probably better spent on petrol for driving the car or other modifications such as a sporty exhaust or intake manifold.
 
It's actually 4.0 litre for the 3.8 conversion, not 3.9.

I know what I'd be doing for an extra few hundred sheets. Puts you into Gen II GTS power/performance.
 
It's still a 3.9 conversion on the 997.1 3.8 using 100mm liners. I had it done to mine and can't say I could really tell a difference from when it was a 3.8. The 3.9 conversion includes a remap which problem gives the most gains as the actual cc increase is so small going from 3.8-3.9. In hindsight I would have just stuck with a rebuilt 3.8, 200cel cats and then a remap by Wayne.

However I really would not bother with the rebuild yet. Wait until either the oil consumption hits >1L per 1000 miles or there is a loud tapping noise at idle from bank 2. Bore score is a slow death and could take 10's of thousands of miles before it becomes a real issue or may not even develop into an issue at all.
 
My apologies - it is 3.9.
 
I'd be tempted to take it to Hartech for a look-see and then, if it does need a rebuild, then schedule the work for the winter when you might want to take the car off the road. And I'd get all 6 cylinders sorted. Or, if you simply got lucky, you can just just drive the thing.
 
Alex said:
My apologies - it is 3.9.
Click to expand...

But it is possibly going to be a 4.0 on the 997 gen 2 (9A1 engine) so you are half right :wink:

I am not expecting to have any issues with my 3.4 9A1 engine Cayman GTS, but if I do I love the idea of a Hartech 4.0 rebuild. That would make a significant increase in performance. 8) :mrgreen:
 
tom_nieto said:
T8 said:
If it's only got light scoring on 2 cylinders are you going to run it until it actually needs something doing. :?:
Click to expand...

Absolutely this. Drive the car for a bit and see what it's like. If it's ticking and drinking oil then you might want to expedite the repair. The worst that will happen in the meantime is worsening of the scoring. Be very happy that you've got enough cash off the purchase price to get a rebuild if it's needed.

If the engine is out anyway, I'd probably go for a full 6 cylinder re-line. Not sold on the merits of a 3.8 to 3.9 conversion. The extra money is probably better spent on petrol for driving the car or other modifications such as a sporty exhaust or intake manifold.
Click to expand...

+2

Agree all of these 3.8 gen 1 engines will have bore scoring to greater or lesser extent at some point in their lives. If its not consuming any oil enjoy as long as you can IMO. As above I think Hartech offer a 4.0 do they not? Congrats!
 
IMI A said:
tom_nieto said:
T8 said:
If it's only got light scoring on 2 cylinders are you going to run it until it actually needs something doing. :?:
Click to expand...

Absolutely this. Drive the car for a bit and see what it's like. If it's ticking and drinking oil then you might want to expedite the repair. The worst that will happen in the meantime is worsening of the scoring. Be very happy that you've got enough cash off the purchase price to get a rebuild if it's needed.

If the engine is out anyway, I'd probably go for a full 6 cylinder re-line. Not sold on the merits of a 3.8 to 3.9 conversion. The extra money is probably better spent on petrol for driving the car or other modifications such as a sporty exhaust or intake manifold.
Click to expand...

+2

Agree all of these 3.8 gen 1 engines will have bore scoring to greater or lesser extent at some point in their lives. If its not consuming any oil enjoy as long as you can IMO. As above I think Hartech offer a 4.0 do they not? Congrats!
Click to expand...

I am thinking this is the best route, until I live with the car I won't have a handle on oil consumption etc. The longer it lasts the more financially I am prepared for the trip to Hartech!
 
SimonBash said:
IMI A said:
tom_nieto said:
T8 said:
If it's only got light scoring on 2 cylinders are you going to run it until it actually needs something doing. :?:
Click to expand...

Absolutely this. Drive the car for a bit and see what it's like. If it's ticking and drinking oil then you might want to expedite the repair. The worst that will happen in the meantime is worsening of the scoring. Be very happy that you've got enough cash off the purchase price to get a rebuild if it's needed.

If the engine is out anyway, I'd probably go for a full 6 cylinder re-line. Not sold on the merits of a 3.8 to 3.9 conversion. The extra money is probably better spent on petrol for driving the car or other modifications such as a sporty exhaust or intake manifold.
Click to expand...

+2

Agree all of these 3.8 gen 1 engines will have bore scoring to greater or lesser extent at some point in their lives. If its not consuming any oil enjoy as long as you can IMO. As above I think Hartech offer a 4.0 do they not? Congrats!
Click to expand...

I am thinking this is the best route, until I live with the car I won't have a handle on oil consumption etc. The longer it lasts the more financially I am prepared for the trip to Hartech!
Click to expand...

What is normal consumption per say 1000 miles on this model 911?

On a turbo its normal to use up to 1 litre every 1000 miles which seemed high to me but its completely normal. Some turbo engines use this much every 1000 miles and others use very little. Type of oil important too especially as engines get older. Worth reading up on for your model.
 
IMI A said:
What is normal consumption per say 1000 miles on this model 911?

On a turbo its normal to use up to 1 litre every 1000 miles which seemed high to me but its completely normal. Some turbo engines use this much every 1000 miles and others use very little. Type of oil important too especially as engines get older. Worth reading up on for your model.
Click to expand...

I think 1l per 1000 miles is quoted as within normal limits for the NA engines too.
 
For mine I'll be keeping an eye on oil consumption and also the sooty exhaust, excessive smoke on start up and the dreaded tap/knock.

It's got a 250 mile trip home tomorrow after collection so will be interesting to see how it does.

I know it needs the alternator wire seeing to as the seller has the lazy crank issue when the weather is warm.

Also thinking of the following pretty immediately:

1. Oil and filter change - OPC or specialist
2. Alternator wire as above
3. Zunsport grills as AC is all good at present
4. Low temp thermostat
5. 3rd rad but I'm still reading up on this

The OPC oil change appeals as I'm curious to see the laundry list of items they highlight as requiring attention!

Any input welcome as always!
 
tom_nieto said:
IMI A said:
What is normal consumption per say 1000 miles on this model 911?

On a turbo its normal to use up to 1 litre every 1000 miles which seemed high to me but its completely normal. Some turbo engines use this much every 1000 miles and others use very little. Type of oil important too especially as engines get older. Worth reading up on for your model.
Click to expand...

I think 1l per 1000 miles is quoted as within normal limits for the NA engines too.
Click to expand...

It's 600 miles per litre I believe......

All engines, even a 1 litre mini engine, will need a rebuild at some stage.

OP, please, get Hartech to have a look before you commit, or someone else who knows their stuff if they are miles away. Don't fall into the trap of doing something because something is better. There is needed, and there is better. Needed is something you do, better is over engineered and expensive.

Once has someone trying to tell me I 'needed' to spend £2,500 on a stereo upgrade because it was better...........

Engineers have a lot to answer for.
 
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