Worn Rotor Tips
Discussion
Burn more oil, starting problems and reduced mpg I think. There are a few specialist rotary engine places
Try here for less hilarious advice
http://mazdarotaryclub.com/
Try here for less hilarious advice
http://mazdarotaryclub.com/
If you are talking about an RX8 they frequently have "mayonnaise" on the dipstick due to condensation, it isn't a problem and only tends to happen in cold weather. Worn rotor tips manifest as a reluctance in hot starting and a gradual loss of power.
to repair you are looking at about £800 worth of parts and a reasonably tricky (but DIYable) job or between £1500-£2000 for an engine rebuild. Best get it ported at the same time.
to repair you are looking at about £800 worth of parts and a reasonably tricky (but DIYable) job or between £1500-£2000 for an engine rebuild. Best get it ported at the same time.
Roughly £2K for a decent rebuild with a good warranty.
Sounds a lot and is for what the cars are worth now, but IMO still worth paying because the RX8 is a brilliant sports car.
Very often excessive wear is caused by failing coil packs which create poor spark making the engine run rich which in turn washes the spray oil off the rotor tips causing early failure...some thing to think about.
Had to replace all 4 coils on my wifes RX8 last year, the car has less than 30k on the clock.
Really good car though!
Sounds a lot and is for what the cars are worth now, but IMO still worth paying because the RX8 is a brilliant sports car.
Very often excessive wear is caused by failing coil packs which create poor spark making the engine run rich which in turn washes the spray oil off the rotor tips causing early failure...some thing to think about.
Had to replace all 4 coils on my wifes RX8 last year, the car has less than 30k on the clock.
Really good car though!
TIMONLINE said:
Cheers guys - so a hydrocarbons failure could well be due to worn rotor tips which is a mega job to fix?
If you failed on emissions the most likely culprit is the cat. Rotarys have a high exhaust temperature which tends to kill cats, this is exacerbated by failing coils which, scandalously are not a service item (in reality they should be done every 30k or so). If the car starts ok hot then I would be checking coils and cat first.
TIMONLINE said:
Is anyone able to advise on the process and cost of replacing worn rotor tips?
What effect is a worn rotor tip likely to have?
Some rotary specialists with good reputations:What effect is a worn rotor tip likely to have?
1. WGT Auto Developments
2. Jimmys (Norfolk)
3. Haywood Rotary
Process is drive in, wait a week, drive out with warranty. Costs £2-£3k.
TIMONLINE said:
Yes - an RX8.
How likely are worn tips to cause hydrocarbon emission failures? Do worn tips mean a rebuild?
From my experience (owned an RX-7 in various stages of tune for 12 years) wear will not cause emissions issues but a cracked/chipped one would but you'd know if that'd happened. How likely are worn tips to cause hydrocarbon emission failures? Do worn tips mean a rebuild?
As others have suggested Cat is most likely culprit but also clean plugs might help and check the coil packs. Dodgy sensors might also be a problem if the ECU gets the wrong info it may not run efficiently enough.
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