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Post by djm16 on Apr 22, 2014 12:01:13 GMT
I have been following this thread with interest as I had a vibration on my P4 90 when the clutch was out of balance. Such a vibration tends not to be very peaky though, as in present at all revs and moderately more so at certain revs.
Have you tried placing your hand at various points on the engine to see where is vibrating the most?
The idea of the ignition being a cause is interesting. It is worth checking with a strobe light the ignition timing in the relevant rev range. The timing mark should advance smoothly with no blurring. If the timing mark looks blurry at 2000rpm or jumps around more than a tiny amount at lower rpm then it may well be that problem is caused by a worn distributor, sticking weights, faulty condensor or points.
Do you have a xenon strobe timing light?
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Post by neilquinn on Apr 15, 2020 20:02:30 GMT
Did you ever sort your shudder out, I have a similar problem after a full car rebuild thanks Neil please help new to site
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Post by johnwp5bcoupe on Apr 15, 2020 20:25:29 GMT
Did you ever sort your shudder out, I have a similar problem after a full car rebuild thanks Neil please help new to site Its an old post Neil 2007 and he hasn't been on since Sept last year! but there is a lot of info on the follow up posts.
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Post by neilquinn on Apr 15, 2020 20:43:04 GMT
Yes can see it’s an old post, no one seemed to have the answer, does anyone know if powder coating the front crankshaft pulley could cause a major vibration. Thanks Neil.
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Post by Brendan69 on Apr 16, 2020 15:58:54 GMT
TBH i would just clean it up as best you can and just give it a light dusting of satin black paint.
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Post by lagain on Apr 16, 2020 16:49:01 GMT
Yes can see it’s an old post, no one seemed to have the answer, does anyone know if powder coating the front crankshaft pulley could cause a major vibration. Thanks Neil. Highly unlikely, could be a mounting, check the tightness of the nuts, engine/gearbox/prop shaft, has the engine been rebuilt. I had a vibration at 70/plus that turned out to be the prop shaft
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Post by enigmas on Apr 17, 2020 0:41:08 GMT
Yes can see it’s an old post, no one seemed to have the answer, does anyone know if powder coating the front crankshaft pulley could cause a major vibration. Thanks Neil. Neil are we talking 6 cyl or V8! In either case what did you have done to the engine during the rebuild stage. For example. Did you change engine components: Rods, pistons, harmonic balancer, flywheel or driveplate, pressure plate? You need to be specific. Who built the engine and what was changed?
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Post by Welsh Warlock on Apr 18, 2020 20:25:50 GMT
Neil, I feel your pain. Almost literally.
I had, or should I say have, an engine vibration since i fitted a replacement unit built by V8 Developments around 2007
I've had the engine out and rebuilt it twice. The second time all moving internals were balanced by John Eales' brother (One of, if not the, most experience RV8 balancer in UK)
I built the engine up with the help of a friend who is an engine builder for Ilmor (and formerly Mercedes F1).
It still vibrated and I've tried everything you can think of and all that has been suggested in this thread to no avail.
I documented everything I did in another thread but the whole thread was deleted thanks to a troll. I really wish I could revive that thread as it was very detailed.
Anyway, over time the vibration (definitely not drivetrain as it's present when stationary ) has reduced and although its still there its barely noticeable. Rally no idea why. It's baffled me and frustrated me for years.
I know of several others who have suffered the same. It's weird when it happens and there's no apparent explanation .
Good luck and let me know if you find an answer.
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Post by enigmas on Apr 19, 2020 23:48:21 GMT
Neil, I feel your pain. Almost literally. I had, or should I say have, an engine vibration since i fitted a replacement unit built by V8 Developments around 2007 I've had the engine out and rebuilt it twice. The second time all moving internals were balanced by John Eales' brother (One of, if not the, most experience RV8 balancer in UK) I built the engine up with the help of a friend who is an engine builder for Ilmor (and formerly Mercedes F1). It still vibrated and I've tried everything you can think of and all that has been suggested in this thread to no avail. I documented everything I did in another thread but the whole thread was deleted thanks to a troll. I really wish I could revive that thread as it was very detailed. Anyway, over time the vibration (definitely not drivetrain as it's present when stationary ) has reduced and although its still there its barely noticeable. Rally no idea why. It's baffled me and frustrated me for years. I know of several others who have suffered the same. It's weird when it happens and there's no apparent explanation . Good luck and let me know if you find an answer. I had this issue with 2 cars both V8s. Both engines were fully rebalanced after being rebuilt. In both instances the issues were related to the add-on components. The first a brand new factory pressure plate that was 35gms out of balance. The second case a fully reconditioned torque convertor from a 'reputable' large reconditioner of these components. Note. In the 2nd case I learned that not all companies rebalanced rebuilt torque convertors...they simply marked the case before splitting them then rewelded them using the alignment marks. This type of rebuild led to an annoying vibration (would jingle the ignition keys at exactly 60 kph) Replacing the torque convertor (from another rebuilder who explained this issue) instantly fixed the vibration problem! * Just because a component is new don't assume that it is correct.
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theroveringmember
Rover Fanatic
P5B Saloon - P4 110 - P6B x2 - 2200TC - 2000TC (S1) 2000SC........How Many Is Too Many?
Posts: 446
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Post by theroveringmember on Mar 12, 2022 22:16:32 GMT
I see there was some activity on this post relatively recently so a brief update. I haven't run my Saloon for ten years now though she was the main car at my wedding for the final trip before the lay-up. We didn't sort the shudder but l ran with it on & off for a few years & she is on the list for a recommisioning beginning this year. When l say 'we', l mean Harvey & myself though Harvey is the main technician of course. We're currently working on/recommissioning my P6B (with the intention to sell her) which developed a sudden non-starting situation after a lockdown-sized gap in proceedings. Suffice to say that gummed up inlet valves had caused a change in profile of the pushrods & we are currently attending to the situation. We will be putting a pair of Sd1 heads on in place of the originals. Regarding the P5, Harvey is reasonably sure that a change of carburettors will cure the shudder so a pair of Hif6's are waiting on the shelf to replace the HS6's. Another pair of Sd1 heads will likely be used too. A NOS steering box bought from James Taylor will replace the worn out, leaky box (that l put on many years ago to replace the worn out, leaky original) currently in place & there might even be a stand-alone overdrive unit sitting on the shelf awaiting its placement behind the BW35. Exciting times ahead but currently, the shudder is still there.
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Post by enigmas on Mar 12, 2022 22:29:53 GMT
If there's a shudder or unwanted vibration at a specific rpm level then it's due to something that's either rotating or reciprocating having been changed, altered or added.
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