Running in?
#3
My experience isn't with an aircooled car so others may help more.
But i was told with my rebuilds from my old race engineering company i used:
1: Never use running in oil,
2: Never use fully synthetic,
3: Combine various types of driving you do, don't try to get it all done at one rev range on a motorway you won't optimize the bores/engine. Town work, motorway, B roads need to be used.
4: Don't mother it but don't work it under load at low or high revs for an initial period. ease it in and occasional use of 1/2 and 3/4 throttle use, but not exceeding the rev limits like Jim says.
You will get much better advice i'm sure, that may be very specific to the 964 but i don't see a lot of replies so chipped in.
But i was told with my rebuilds from my old race engineering company i used:
1: Never use running in oil,
2: Never use fully synthetic,
3: Combine various types of driving you do, don't try to get it all done at one rev range on a motorway you won't optimize the bores/engine. Town work, motorway, B roads need to be used.
4: Don't mother it but don't work it under load at low or high revs for an initial period. ease it in and occasional use of 1/2 and 3/4 throttle use, but not exceeding the rev limits like Jim says.
You will get much better advice i'm sure, that may be very specific to the 964 but i don't see a lot of replies so chipped in.
#6
A good oil for this purpose may be Mobil S 10w40 semi synthetic. Its a very good quality oil and yet only semi synthetic (hard to find a suitable 10w40 mineral up to the job)
They didn't explain why not to use running in oil, they just shook their head in a "you must be joking" way. On the subject of fully synthetic the explanation is fairly simple, fully synthetic doesn't allow wear to bores at a medium rate due to its properties and this is precisely what you need to happen to bed everything in prior to giving the car some stick. You need metal to metal contact to wear the engine in and fully synthetic does its best to prevent this, while mineral oil or semi can allow some wear. This can result in slightly raised engine temps due to initial friction on a rebuild.
An interesting article on the subject even though its not air-cooled related pumaracing running in
as i say others with air cooled experience like Boxsey can help further
They didn't explain why not to use running in oil, they just shook their head in a "you must be joking" way. On the subject of fully synthetic the explanation is fairly simple, fully synthetic doesn't allow wear to bores at a medium rate due to its properties and this is precisely what you need to happen to bed everything in prior to giving the car some stick. You need metal to metal contact to wear the engine in and fully synthetic does its best to prevent this, while mineral oil or semi can allow some wear. This can result in slightly raised engine temps due to initial friction on a rebuild.
An interesting article on the subject even though its not air-cooled related pumaracing running in
as i say others with air cooled experience like Boxsey can help further
#7
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Thanks lads im picking it up tommorow after about 6 weeks and many probs,gearbox and engine rebuild,new clutch and god knows what else.I m dreading the bill!!!
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#9
Not something i would want to pay tomorrow but as long as you keep the car for a good while it will show a healthy return in reduced running issues.
I see from another thread that you left the car to idle for approx 2hours, unless i'm mistaken (possible). the worst thing for any engine and especially the cam is to be allowed to idle for extended periods. The stress required to idle a cam is immense, thats why most cams are run in at 2000 rpm and not idle. We used to get a few brand new cams come back in, all rejected under warranty as they weren't run at 2000rpm during the run in. (BTW we didn't reject the cam but the manufacturer did). But all cars are different and the process of manufacturer on a 964 might not put additional stress on the cam during idle, worth mentioning anyway
Good luck with the car, got any pics?
I see from another thread that you left the car to idle for approx 2hours, unless i'm mistaken (possible). the worst thing for any engine and especially the cam is to be allowed to idle for extended periods. The stress required to idle a cam is immense, thats why most cams are run in at 2000 rpm and not idle. We used to get a few brand new cams come back in, all rejected under warranty as they weren't run at 2000rpm during the run in. (BTW we didn't reject the cam but the manufacturer did). But all cars are different and the process of manufacturer on a 964 might not put additional stress on the cam during idle, worth mentioning anyway
Good luck with the car, got any pics?
#13
Rennlist Member
my run in was to push it on hills, vary rpm all over the place, work the dickens out of the rings.
I am not kidding. I guess everyone has their own run in.
I am not kidding. I guess everyone has their own run in.
#14
Three Wheelin'
Not something i would want to pay tomorrow but as long as you keep the car for a good while it will show a healthy return in reduced running issues.
I see from another thread that you left the car to idle for approx 2hours, unless i'm mistaken (possible). the worst thing for any engine and especially the cam is to be allowed to idle for extended periods. The stress required to idle a cam is immense, thats why most cams are run in at 2000 rpm and not idle. We used to get a few brand new cams come back in, all rejected under warranty as they weren't run at 2000rpm during the run in. (BTW we didn't reject the cam but the manufacturer did). But all cars are different and the process of manufacturer on a 964 might not put additional stress on the cam during idle, worth mentioning anyway
Good luck with the car, got any pics?
I see from another thread that you left the car to idle for approx 2hours, unless i'm mistaken (possible). the worst thing for any engine and especially the cam is to be allowed to idle for extended periods. The stress required to idle a cam is immense, thats why most cams are run in at 2000 rpm and not idle. We used to get a few brand new cams come back in, all rejected under warranty as they weren't run at 2000rpm during the run in. (BTW we didn't reject the cam but the manufacturer did). But all cars are different and the process of manufacturer on a 964 might not put additional stress on the cam during idle, worth mentioning anyway
Good luck with the car, got any pics?