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| Harmonic balancer on a 1098 https://www.ausmini.com/forums/viewtopic.php?f=2&t=59829 |
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| Author: | drmini in aust [ Sat Dec 26, 2009 7:40 pm ] |
| Post subject: | Harmonic balancer on a 1098 |
I've noticed a few `stroker 998s' have been rebuilt with a 1098 crank & pistons, by a couple of well known Mini engine rebuilders a few years apart (no names, no pack drill), and both have left the old 998's tin crank pulley on them. Isn't this a BAD idea? Vizard implied in his books that any long stroke crank with no harmonic balancer would have a very short lifespan. True or false?? 
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| Author: | GT mowog [ Sat Dec 26, 2009 8:07 pm ] |
| Post subject: | Re: Harmonic balancer on a 1098 |
drmini in aust wrote: I've noticed a few `stroker 998s' have been rebuilt with a 1098 crank & pistons, by a couple of well known Mini engine rebuilders a few years apart (no names, no pack drill), and both have left the old 998's tin crank pulley on them.
Isn't this a BAD idea? Vizard implied in his books that any long stroke crank with no harmonic balancer would have a very short lifespan. True or false?? Of all A series engines, a Harmonic Balance is a MUST on these. They do have the longest of any standard stroke at 3.3" and the cranks while 'fairly strong', are not 'stout'. These cranks would 'feel' the harmonics more so than any other standard crank, |
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| Author: | gafmo [ Sat Dec 26, 2009 8:22 pm ] |
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poignant topic for me and yes i'm on the look out for a good 1098 Harmonic balancer...why go off half balanced when everything else is..harmonics is like Serenity |
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| Author: | BALLISTIC [ Sat Dec 26, 2009 8:32 pm ] |
| Post subject: | |
gafmo wrote: poignant topic for me and yes i'm on the look out for a good 1098 Harmonic balancer...why go off half balanced when everything else is..harmonics is like Serenity
Good ol' "s" balancers will do the trick for you Gaf 
get it balanced with all the other bits and pieces and you'll be right 
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| Author: | gafmo [ Sat Dec 26, 2009 8:56 pm ] |
| Post subject: | |
hehe everything balanced but have to get a balancer thats not cracked up |
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| Author: | drmini in aust [ Sat Dec 26, 2009 9:10 pm ] |
| Post subject: | |
Gaf, Just because the rubber looks cracked on the back, it may not be inside, really. (same story with 67> lower arm rubber bushes) Slice it off flush with a blade, if it looks OK then, it's good to go.
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| Author: | GT mowog [ Sun Dec 27, 2009 6:41 am ] |
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If it's just the rubber that looks cracked, do as the doc suggests, but you'll find that most, if not all of them have rubber that has cracks on the parts of it you can see. The standard 1100 or late 998 ones (p/n 88G305) will get the job done quite OK. |
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| Author: | miniDave [ Sun Dec 27, 2009 7:14 am ] |
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BALLISTIC wrote: get it balanced with all the other bits and pieces and you'll be right
What if the engine has all been put back together? Can you just bolt the HB on? And if the engine has been all balanced does it mean you don't need the HB or is the actual harmonics that do the damage eventually? Not for me you understand . . . but I have a friend that will need to know. |
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| Author: | drmini in aust [ Sun Dec 27, 2009 7:39 am ] |
| Post subject: | |
The term `harmonic balancer' is a misnomer, it has nowt to do with crank dynamic balance really. It is correctly called a crank damper in the US, because it damps torsional oscillations in the crank. The longer the crank stroke, the more one is supposed to be needed. |
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| Author: | miniDave [ Sun Dec 27, 2009 7:43 am ] |
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Morning Kev, Found this place that sells the balancer: http://www.precisionparts.com.au/Pages/ ... _page.html |
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| Author: | drmini in aust [ Sun Dec 27, 2009 7:49 am ] |
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Do they still make them though?? You can also get them new (or they rebond yours) from Ross Tuffbond in Blacktown. Wombat got his there. http://www.rossperformanceparts.com/ |
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| Author: | miniDave [ Sun Dec 27, 2009 7:50 am ] |
| Post subject: | |
Read another page and it looks like the Mini ones are 'exchange'. |
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| Author: | GT mowog [ Sun Dec 27, 2009 8:21 am ] |
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miniDave wrote: BALLISTIC wrote: get it balanced with all the other bits and pieces and you'll be right What if the engine has all been put back together? Can you just bolt the HB on? And if the engine has been all balanced does it mean you don't need the HB or is the actual harmonics that do the damage eventually? Not for me you understand . . . but I have a friend that will need to know. Yes, the engine is best balanced as an assembly (a good balancer person will start with the crank, balance that and then add one piece at a time and balance that etc), however, if the engine has been balanced and say you need to replace the HB, then just have the new HB balanced. It is not 100% correct, but is very very acceptable, should get you better than 99.95%. If you don't like the idea of that, then pull your engine down and have it all done again. |
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| Author: | 74snail [ Sun Dec 27, 2009 9:42 am ] |
| Post subject: | |
BALLISTIC wrote: gafmo wrote: poignant topic for me and yes i'm on the look out for a good 1098 Harmonic balancer...why go off half balanced when everything else is..harmonics is like Serenity Good ol' "s" balancers will do the trick for you Gaf get it balanced with all the other bits and pieces and you'll be right And as has been discussed before, the final part is a Timing belt , the rubber belt acts like an extra harmonic balancer . . |
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| Author: | aaron [ Sun Dec 27, 2009 1:16 pm ] |
| Post subject: | |
Ive got a few....
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