bottom and top end rebuilds

[Lowlander]

Hi there,

I am aware that a lot of cars have had top end rebuilds. How robust is the bottom end of a 3.2?

How much would I be looking at for a top end rebuild and how much for a full engine engine rebuild at a porsche specialist?

Thanks

Martin.

 

[Chris_911]

Bottom end is pretty much bullet proof, assuming the engine has had regular & frequent oil changes.

Reported top end issues seem to centre around valve guide wear.

 

[Guest]

Costs depend very much on what else you do while you are in their. The machine work for my top end and new valve guides was IIRC something like £300, but you have to add labour for engine in/out and heads on/off - somewhat oversimplified but you get the picture. If you did nothing but guides you *might* get by with a bill as small as £1500-2000. Most everyone takes the opportunity to do a bunch of engine out, "while you are in there" type of jobs. So I did : 930S clutch, lightweight pressure plate, cams, race Ti valve retainers, race valve springs, rering, stretch type rod bolts, head studs, chain ramps and chains, SSI exhaust, backdate heat etc. I built a 7000+rpm motor with a 8000rpm valvetrain, which is more than is really necessary, but the "while you are in there" bug is pretty strong [] You can keep the cost to a reasonable level if you are careful sourcing some of the parts yourself and if you have a sensible plan for the engine. I didn't want to do things twice so I did it "right" once as a platform for the future. My bill isn't representative as I had a couple of favours that reduced the cost, but you could do most of what I did for around £5k if you pick your mechanic carefully. This seems a lot in terms of the purchase price of these cars but as they don't really depreciate its kind of acceptable [&:] and a good rebuild and remap is going to add 30+hp to your car and another 150k miles of fun to your life.