comp results

[fischer]

Had a comp test done on Saturday, after owning the car for over three years I was interested to see how the old girls ticker was doing.

7.5 7.5 7.8

8.1 8.0 8.2

Quite happy with that.

 

[noop]

Where'd you get your test done?

 

[Fiddy]

Very good mate

 

[Francob]

Noob here, what’s the poor, good and very good numbers for a rotary compression test.

 

[Cyman]

nice one alan, its nice to see your old grandad driving isn't knackering the engine

 

[cib24]

It's all of those track days and nurburgring journeys. Keeps it healthy with good use. These cars are a bit like TVRs, they don't like to sit around!

 

[jdmr_neil]

Noob here, what’s the poor, good and very good numbers for a rotary compression test.

8 new
7 rebuilt
6 big ports or used
5 well used
4 needing a rebuild
3 dead

Most 13b would be still running into the 4s. Mine was only starting to take a bit longer to start after heavy track use, very hot, in the high 4s.

Cold start was fine.

 

[fischer]

The idea of the comp test was see how the old girl was doing so I could make a decision about her future.
,
I was considering putting her up for sale, @Martin17 has done a pretty good job of convincing me otherwise, the
comp test results brought as much of a smile to his face as they did to mine.

still need to give it some thought but I do enjoy the drive these cars offer.



.

 

[cib24]

Nah, we need you to buy a bigger turbo and make some more power. You've mastered the T04E at 300-330bhp.

I'll see you at the nurburgring next year.

 

[Francob]

8 new
7 rebuilt
6 big ports or used
5 well used
4 needing a rebuild
3 dead

Most 13b would be still running into the 4s. Mine was only starting to take a bit longer to start after heavy track use, very hot, in the high 4s.

Cold start was fine.

Thanks for the info.

Would you expect to see lower results on a bridge vs say a street or stock port then ?

 

[cib24]

Thanks for the info.

Would you expect to see lower results on a bridge vs say a street or stock port then ?

Yeah. Most cars built for some power are built with looser clearances so expect best results to be low 7s but more often than not swimming in 6s.

 

[Ben_r1]

I’ve got an Rx8 mostly in the 5s and seems to drive and start perfectly, bit of a mystery on what’s acceptable really

 

[Satoshi-FD3]

I’ve got an Rx8 mostly in the 5s and seems to drive and start perfectly, bit of a mystery on what’s acceptable really

A lot of people are happy to run them below Mazda's minimum specifications, me on the other hand it's a no, no.

The amount of engineering and R&D that went into the rotary engine to me means that what the manufacturer says is best, if you're in the 6's you should refresh the seals. Wear is wear and going too low could result in a repair bill more expensive than just a new seat of seals. Luckily for RX8 owners there are a lot of spare engines around, due to the chassis rusting away.

 

[JoeLanger]

Rx8 compression ratio is 10:1 compared to 8:1 for an RX7

 

[Cyman]

A lot of people are happy to run them below Mazda's minimum specifications, me on the other hand it's a no, no.

The amount of engineering and R&D that went into the rotary engine to me means that what the manufacturer says is best, if you're in the 6's you should refresh the seals. Wear is wear and going too low could result in a repair bill more expensive than just a new seat of seals. Luckily for RX8 owners there are a lot of spare engines around, due to the chassis rusting away.

in an fd an engine in the 6,s is fine. i would only start putting money back for a rebuild if it got to very low 6 or high 5,s ready for low 5,s which could still literally take years if the car is looked after

 

[Satoshi-FD3]

in an fd an engine in the 6,s is fine. i would only start putting money back for a rebuild if it got to very low 6 or high 5,s ready for low 5,s which could still literally take years if the car is looked after

Not based on your last sale / return took months!

Out of spec is out of spec, it's just a matter of time, best to refresh and get it back to good health than have to replace irons and housings because "it'll last longer if I nurse it".

 

[Cyman]

Not based on your last sale / return took months!

Out of spec is out of spec, it's just a matter of time, best to refresh and get it back to good health than have to replace irons and housings because "it'll last longer if I nurse it".

Please explain about my last sale / return took months