over reved my 1293, whats the damage?
Discussion
hi guys, just returning to PH,
recently bough a 68 mini with a 1293 in it.
I just serviced it and went for a spin, part of the drive was on motorway and I gave it a boot. my rev limit is 5.2k and in the excitement I went past that but not by much, engine felt and sounded like I had dropped a cylinder so pulled into a layby and switched it off, fearing the worst I checked underneath expecting a pile of parts and oil but nothing so jumped back in and tried starting it and all sounded fine again. to be honest this has confused me, have I just got very lucky or any suggestions what to check to make sure all is actually ok? sorry if this sounds a stupid post but just cant believe I may have got away with this after the noise it made.
recently bough a 68 mini with a 1293 in it.
I just serviced it and went for a spin, part of the drive was on motorway and I gave it a boot. my rev limit is 5.2k and in the excitement I went past that but not by much, engine felt and sounded like I had dropped a cylinder so pulled into a layby and switched it off, fearing the worst I checked underneath expecting a pile of parts and oil but nothing so jumped back in and tried starting it and all sounded fine again. to be honest this has confused me, have I just got very lucky or any suggestions what to check to make sure all is actually ok? sorry if this sounds a stupid post but just cant believe I may have got away with this after the noise it made.
Why is your rev limit only 5200 rpm?
The old A-Series engine is always good for 6000 rpm through the gears or for a blast in top (assuming you can reach 6000 rpm in top).
Unless you took it to well over 6500 rpm there should be no damage at all.
The only ways in which damage can result from high revs is usually low oil pressure, an ignition curve which is over-advanced and a broken valve spring caused by excessive 'Valve-Bounce'.
The old A-Series engine is always good for 6000 rpm through the gears or for a blast in top (assuming you can reach 6000 rpm in top).
Unless you took it to well over 6500 rpm there should be no damage at all.
The only ways in which damage can result from high revs is usually low oil pressure, an ignition curve which is over-advanced and a broken valve spring caused by excessive 'Valve-Bounce'.
thanks for the reply cooperman.
I've only had this mini for a couple of weeks, its got a smiths rev counter fitted which the previous owner had set the red had to 5.2k just assuming that is set for a reason. also the fact that when I exceeded this in 4th the engine felt and sounded like it dropped a cylinder, power dropped as well, luckily this was right before a layby so basically stopped immediately. car also "feels" like it doesn't want to go past that mark. I've had the car back out for a wee drive and all seems fine, just concerned about the noise and drop in power when I was pushing on.
I've only had this mini for a couple of weeks, its got a smiths rev counter fitted which the previous owner had set the red had to 5.2k just assuming that is set for a reason. also the fact that when I exceeded this in 4th the engine felt and sounded like it dropped a cylinder, power dropped as well, luckily this was right before a layby so basically stopped immediately. car also "feels" like it doesn't want to go past that mark. I've had the car back out for a wee drive and all seems fine, just concerned about the noise and drop in power when I was pushing on.
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