BMonkey

My 2 cents is that it has nothing to do with coolant flow. The #2 rotor is wedged between the transmission and the #1 rotor. The clutch housing on the back of the rear side housing is larger than the entire housing. At highway speeds the ambient air temperature under the hood is going to be close to the air temperature outside. The #1 rotor has tons of metal surface area exposed to radiate heat to the air. Where the number #2 only has the outside of the rotor housing to radiate the extra heat caused by it being butted to the transmission.

Just a guess though...

xfukxshytxupx

i just had my codes read today and i have a misfire in #2 and i need to replace my o2 sensor. the thing i didnt understand though it says i have 2 misfires at the same place. is that possible?

xfukxshytxupx

The following is my conclusion from reading the discussions about RX 8's rotary engine failure problems from other RX 8 forums on the Internet and from currently owning a 2005 RX 8. You can form your own conclusions

The only thing wrong with Mazda RX 8's sold in the USA is that Mazda USA requires the use of a very thin light weight 5W-20 oil that breaks down and cannot protect the rotary engine and catalytic converter from early failure, because the normally very hot running engine runs very, very hot especially in slow traffic and long drives in warm weather. Every city in the USA has slow traffic jams and warm weather so what good is the RX 8 using this oil in the USA.

Every where else in the World (except in the USA) Mazda requires in the RX 8 Owners Manual the use of 5W-30 oil to adequately protect the very same hot running rotary engine that is in RX 8's in the USA. The heavier oil protects the engine and oil seals from failure and prevents oil blow by from ruining the catalytic converter, for over 200,000+ miles, as documented in many forums on the web.

For example, printed on Castrol bottles of 5W-20 weight synthetic oil, says "use only in cars used for short trips" and another 5W-20 Castrol bottle of non synthetic oil says "use only if required by the car manufacture". Other wise, Castrol ,who sets the standard for excellent oil, does not recommend the use of 5W-20 oil unless directed to by the car manufacture or for short trips.

In addition, Castrol can be objective with out any conflicts of interest about which oil weight not to use to protect an engine, because it does not manufacture cars nor have any vested interests or concerns about meeting EPA miles per gallon requirements to avoid fines.

In the USA the RX 8 engines using the very light 5W-20 weight oil last maybe for around 30,000 miles before needing to be rebuilt a number of times before and after expiration of the warranty. This is probably why Mazda now only warrants the car for 3 years or 36,000 miles instead of the prior warranty of 5 years or 50,000 miles. This is also clearly documented in many RX 8 owner web sites.

However, in the USA Mazda requires the use of inadequate light weight 5W-20 oil in order for Mazda to meet EPA miles per gallon (MPG) gas consumption requirements. This light weight oil shortens the life of this normally very hot running rotary motor to around 30,000 miles, at the expense of the consumer who needs to keep spending lots of money and time to keep it running.

The owners must keep them running because no dealership wants to take the car in on trade or offer a fair amount on trade due to the now widely known problems Mazda has caused to happen to the RX 8

New buyers should consider not buying Mazda RX 8 cars until Mazda permits USA owners to also use non synthetic 5W-30 oil in their rotary engine, without loosing their warranty, as Mazda recommends throughout the rest of the World. Mazda could still put in the USA, RX 8 owners manual, recommendations to use 5W-20 oil to satisfy EPA , but not cancel the warranty of those who wisely choose to use non synthetic 5W-30 oil as recommended by Mazda, thorough out the rest of the World.

A class action law suit will straighten out Mazda and increase the life of our cars and make the car worth a proper amount when traded. RX 8 owners in the USA did not buy their RX 8 with full disclosure by the Mazda dealership that the car motor and catalytic would wear out much, much quicker than other cars, due to Mazda oil requirements in the USA nor how Mazda treats the USA RX 8 customer.

My Mazda dealership before purchase told me the RX 8 motor would last over 200,000+ miles because it was the nature of rotary engines. With the first oil change though they also told me they would not put 5W-30 weight oil in my RX 8 because according to them it would damage the engine (which is a lie) and would void the warranty, according to Mazda USA. Well it is common knowledge now with the USA Mazda required use of 5W-20 oil that the engine will not last 200,000 miles as advertised and more like it the motor will only last around 30,000 miles before needing to be rebuilt again and again etc.

Every RX 8 owner in the USA had better individually or join together to fight the Mazda lies about the weight of oil to use in their RX 8 or their motor's will have a very short life with no one to blame in the long run except for your own lack of sticking up for yourself and what you know is right.

i found this on a link on google that implied most common failures with the rx8.if needed ill post up the link.
thanks for the input everyone