Mazda RX8 thread - Avant

I'm sorry but I have had to hide a thread about repairs to a Mazda RX8 where the poster swore and abused the garage concerned.

However aggrieved you feel, you can't use abusive language on a public forum. We are at risk of legal action against us for defamation if the claims are untrue.

Please have a look at the sticky thread at the top of this screen about 'naming and shaming'.

Mazda RX8 thread - 72 dudes

Mazda RX8??

Did the OP do zero research on these money pits?

Mazda RX8 thread - Wackyracer

I read the original post, their engine needed a rebuild so they spent somewhere circa £1200 having it rebuilt and said it was overheating and loosing water afterwards.

I really don't understand why people buy them myself. Plenty of decent other cars to buy secondhand.

Mazda RX8 thread - Ordovices

I'm sure the mazda devotees will be along to defend the brand shortly. Apparently they are "super" reliable.

Mazda RX8 thread - gordonbennet

Clackson and the disciples raved about the things at the time, which tells you all you need to know.

Mazda RX8 thread - craig-pd130

I'm sure the mazda devotees will be along to defend the brand shortly. Apparently they are "super" reliable.

Despite Mazda spending 40+ years trying to debug the rotary engine, it is simply is not up to the typical usage pattern of a non-enthusiast owner.

Yamaha spent multi-millions of yen on its RZ201 rotary motorcycle, and unveiled it at a couple of shows, but the firm saw the light and canned the project before mass producting it. The RE5 very nearly bankrupted Suzuki with its development costs, poor sales and warranty claims.

I would love a Norton rotary though, for this reason - the Snetterton race of aces in 1988: www.youtube.com/watch?v=kBg86bjr8l0

Two Nortons, literally built in a shed, s t e a m i n g past the cream of the Japanese factory race bikes. No wonder rival teams protested and got the bike banned in short order (wrongly - as like a two-stroke, each rotor face has a combustion 'stroke' once per revolution of the output shaft so the 588cc capacity is correct)

Mazda RX8 thread - Trilogy

Apparently, they nearly use more oil than petrol!

Mazda RX8 thread - SteveLee

I read the original post, their engine needed a rebuild so they spent somewhere circa £1200 having it rebuilt and said it was overheating and loosing water afterwards.

I really don't understand why people buy them myself. Plenty of decent other cars to buy secondhand.

I remember the sum being nearer £2800 - which is why I questioned the sanity of the owner given that a 54 reg RX8 is worth less than £1000 - just throw it away and buy another one if you like them so much.

Having driven one I think it the best Japanese car I've ever driven for smiles per mile. Damn, I think I've just convinced myself to buy one! - a cheap disposable plaything.

"I really don't understand why people buy them myself." Because they are as much fun as an M3 and can be bought with the loose change found down the back of the sofa.

Mazda RX8 thread - Bobbin Threadbare

As a physicist, I like the fact that a company actually went ahead with such a weird concept and put it on the mass market. They are to be considered only as an experiment, and probably would run well as a second car (weekend runner?!)

If you want the fun and power but longevity, get a MX5.

Mazda RX8 thread - Wackyracer

I remember the sum being nearer £2800 - which is why I questioned the sanity of the owner given that a 54 reg RX8 is worth less than £1000 - just throw it away and buy another one if you like them so much.

Well, I think they said the price had increased from what they were originally quoted. So maybe I only remembered the original quote. Either way, You'd expect the rebuilt engine to run without fault.

"I really don't understand why people buy them myself." Because they are as much fun as an M3 and can be bought with the loose change found down the back of the sofa.

Maybe so but, People seem to buy them not fully understanding that with these cars performance is good but, reliability is not. That is fine if your buying it as a weekend toy.

The problem is alot of people buy them expecting them to be as reliable as other mazda's.

Mazda RX8 thread - SteveLee
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The problem is alot of people buy them expecting them to be as reliable as other mazda's.

They are as reliable as other Mazdas - it's longevity that's the issue not reliability - there's a subtle difference. RX8s don't tend to break down - but the rotor tips wear faster than the rings of a conventional engine. They also flood if you shut them down cold and attempt a restart. Other than that you should expect usual Japanese reliability - just a shorter than usual engine life which is a trait associated with rotary engines..

As for "reliable as other Mazdas" - failed DPF regens anyone?

Edited by SteveLee on 03/06/2014 at 01:06

Mazda RX8 thread - Wackyracer

Oh dear, Down to splitting hair now! Ok............ I'll leave it there. Must remember that next time someone says Unreliable, I can correct them and say they must mean run out of longetivity!

Mazda RX8 thread - SteveLee

They are two different things - unreliable means you cannot depend on it to function day to day - not the case for an RX8. The engine type lacks longevity meaning the engine may not last as long as the car. The two are not difficult concepts to comprehend.

Mazda RX8 thread - Wackyracer
They also flood if you shut them down cold and attempt a restart.

As do alot of other petrol cars.

Mazda RX8 thread - SteveLee
They also flood if you shut them down cold and attempt a restart.

As do alot of other petrol cars.

Rotarys are worse as the flooding reduces the effective compression ratio critically to the point where it will not run. Even when suffering from bore wash, a traditional four stoke will still make enough compression to run after you given the plugs a few minutes to dry off.

The easiest way to “fix” this issue would be to put a relay in-line with the fuel pump supply, then put a switch in the cockpit to control this. When you want to shut down your cold engine, flick the switch controlling the relay and the engine will stop naturally from lack of fuel – leaving it dry for a restart. I suspect this would greatly extend the life of the engine if used for a lot of stop-start trips as the rotor tips are probably damaged by rotor wash from cold starts.

For electrical reliability, I'd use the unenergised bridged terminals to drive the pump by default, so if the relay malfunctions it will probably do so in the state which allows the fuel pump to run. Energising the relay will break the circuit – the opposite of how most relay circuits are wired up.

Mazda RX8 thread - Ordovices

It all really depends on what your concept of reliability is.

If you only expect the engine to last a few thousand miles without having to have corrective actions of some sort, then hey presto, they're incredibly reliable. Not unlike a 2B pencil being used to write on concrete, if you don't expect to write much then you have an ultra reliable pencil.

Reliability has to have some function of time/actions/events associated with it to be meaningful.

Mazda RX8 thread - SteveLee

When used primarily for long journeys there are plenty of RX8s on 100,000K+ miles - out lasting many explooding VAG diesels.

When used primarily for short runs, the RX8 engine can wear out in around 50,000 miles. I suspect they run too rich when cold causing excessive rotor tip wear.