964RS Engine overhauls
- Thread starter oldtimer
- Start date
Depends on how hard and smoothly it's driven with oil changes ..... "other" air cooled normal 911 normally a top end round 100,000 miles or a bit more .....
The 64RS engine does seem a lot more robust, only suffering from mist down changes ... ouch!
The 64RS engine does seem a lot more robust, only suffering from mist down changes ... ouch!
If you are club racing one, I think many people go at least a couple of seasons and check with leak down or even dyno. As above really hard to tell otherwise. If you start missing gears or being messing on the downshift its going to be sooner. if the engine is in fine fettle leave alone, if it starts slipping (as per a leakdown), start saving......
As said above maintenance is everything. Dont expect to open it up and spend a couple of grand doing the top end. Anticipate doing the works, then you might be pleasantly surprised. Whilst the Engine is a great engine, they are expensive to put right for the power you get out of them.
There are a few of us that have rebuilt engines on here and I'm sure we happy to share experiences with you.
As said above maintenance is everything. Dont expect to open it up and spend a couple of grand doing the top end. Anticipate doing the works, then you might be pleasantly surprised. Whilst the Engine is a great engine, they are expensive to put right for the power you get out of them.
There are a few of us that have rebuilt engines on here and I'm sure we happy to share experiences with you.
Steve Brookes
Moderator
Mine got the full monty at 170,000 miles.....so since you boys drive your RSs twice as hard you'll need it at a paltry 85,000 [
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It's a piece of machinery it wears out like any other piece of machinery. It's not magic . There are a few fairly simple checks that will give you a reasonable idea of the engines health. A compression test will give you a vague idea of how healthy your cylinders are. A leakdown test will give you a more in depth idea about how good the valves and rings are. Any signs of significant loss in these tests suggest a rebuild is a good idea. It's worth noting that engines can go to very high mileage before anything gets noticed, if such tests are'nt carried out. Its very difficult in our cars to notice power loss unless you drive two "identical "cars back to back. It does'nt mean the engine has'nt worn, it's just never been checked properly ! Which means that there are probably quite a few 200hp RS out there !
Further to this, age means seals perish. Nothing lasts forever and the seals in our cars are getting on. Which means leaks are likely. A good tech will be able to advise on what you can and can't live with. You might decide leak free is the only way to go.
When I tore down the top end of my last RS (due to mis shift) at @ 35k miles (i think , it was a long time ago) the heads and valves/ guides showed very little wear as did everything else. Wisdom suggests that nothing lasts forever and I would suggest that any air cooled 911 is likely to show valve guide wear by 75k miles and track driven cars likely earlier. Nothing is set in stone and as the americans like to say, your mileage may vary.
Further to this, age means seals perish. Nothing lasts forever and the seals in our cars are getting on. Which means leaks are likely. A good tech will be able to advise on what you can and can't live with. You might decide leak free is the only way to go.
When I tore down the top end of my last RS (due to mis shift) at @ 35k miles (i think , it was a long time ago) the heads and valves/ guides showed very little wear as did everything else. Wisdom suggests that nothing lasts forever and I would suggest that any air cooled 911 is likely to show valve guide wear by 75k miles and track driven cars likely earlier. Nothing is set in stone and as the americans like to say, your mileage may vary.
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