Hello, All
Looking to do a rotating assembly (e\'shaft+rotors+flywheel and contrweight) balancing.
May you know, who can provide such a service in UK? Europe?
Thanks,
Mindaugas Akelis
Lithuania
Hi!
wow, you got more response in Sweden then you got in the UK.. :D
//Magnus
Hi Mindaugas and Magnus, pleased you both post here.
l have lots of piston stuff balanced over the years but not Rotary .
Do you even need this done on a stock eccentric shaft due to the short throw ?
I understand that with the Rotors you just need to ensure they are close in weight to each other.
And if you buy a good clutch assembly to take a lot of power this will come with a very light pre balanced flywheel and you just need an Auto counter balance weight to ensure balance.
If you really need this done l am sure we can find you someone to do this.
Can l ask what are you building that will need balancing like this
All the best Clive
clive@mazdarotaryclub.com
//www.mazdarotaryclub.com
If you have a matching set (from the same motor) they should be sweet as! If you are racing (high RPM / high boost etc) then maybe you should balance them...
If you don\'t have a matching set then first thing is to check the weights - on rotors there is a letter stamped on the side (ring gear side I think) - A, B, C, D. If you have 2 of the same letters no worries - if the letters are one off (you have an A and B, or a C and D) then that is close enough - if you have an A and C then balance time.
No idea who would do it there - PM Carl, he will be able to sort it out.
As well as the rotors, you get the counter weights done, flywheel and even clutch pressure plate.
In NZ, my rotating assembly has just been balanced, cost about $300 NZD. (100 of your Euro\'s?????)
Carl - be good if you can reply here on the thread.
As RE10 has mentioned, if you have to resort to having a balance done then do the whole lot together. I had this done in Australia a few years ago now (had lightened rotors etc.) and it was around AUD$400 back then.
I would hope that some of the rotary shops in the UK know where to get this work done. Pip Gardner should also know (from //www.wgtautodevelopments.co.uk)
Hello, All
Talking about subj., it is known advatages of lighter rotating assy.
In this case, beside the lighter flywheel I have a possibility to grind the rotors ("super light" Racing Beat TM:).
All that would mess a balance.
Even beside that I\'m wondering whet rotary engines being called as "well balanced". My mind it is upside down, they are "unbalanced". So dynamic balancing allways wellcome.
What guys are your opinion?
Thanks,
Mindaugas Akelis
Some racers lighten them (which is part of the balancing process, don\'t just start hacking away with your grinder ), but unless you are after the last couple of horse power on the track, it may not be worth your while.
The lighter your rotating assembly is the quicker it spools up, but the ability to keep up the rev\'s under load drops away as does some drivability - you will be forever changing gear keeping it in the power. My one has a 7lb flywheel, great at full noise, not so for round town (when it is going :( )
For VERY HIGH REVVING and perofmance from a rotary engine you need to do the following.
When you lighten with the rotors then they each have to be rebalanced on their own as you may have removed material from one side more than another.This is done with the rotor each having some material removed until thay balance when spinning not on the eccentric shaft but just spun up by itself.
Then you need to make sure that each rotor weighs the same as each other.this is when it becomes a juggling act backward and forward with balancing too.
After this each rotor is then put onto the eccentric shaft and the counterweights too and the rotors are locked so that they do not rotate.(the shaft may have been lightened too)
Then the whole lot is rotated to check balance the same a piston engine(Almost).The counterweights are adjusted by weight removal until they are balancing the rotors and that is it.
You have to allow a little weight in the rotors for oil and don\'t forget the seals too.
In my expieriece you do not need to lighten rotors nowadays as they are made pretty light as it is.
You can get turbo and non turbo 13b rotors that are just 4300 grams and if you go much lighter by machining them then they will be made weaker which in combination with more power makes them more likely to go wrong.
The new RX8 rotors weigh 3500 grams so if you modify an RX8 engine then you will have gained the advantage there of strength with weight reduction.
If you use stock rotors then look for 2 of the same weight ,ie put a B weight with a B and check the clearance in the rotor housings It should be .015 inch.(Stock .010 inch).
Hope this helps.
Kind regards
Carl