Pictures inside an original 100k motor...
04-27-2010, 01:59 AM
#51
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agree with all that///
Mazda made 2 big mistakes in US market. First was they priced this car too low. (Low price equals little owner respect). Second they really messed up with the oil spec....5w20 is hopeless!
I think over 120,000 RX8's were sold in the US since launch 2004, though I may be wrong. Most of the "failures" of worldwide sales of 275,000 (about 5%) were in the US!
Mazda made 2 big mistakes in US market. First was they priced this car too low. (Low price equals little owner respect). Second they really messed up with the oil spec....5w20 is hopeless!
I think over 120,000 RX8's were sold in the US since launch 2004, though I may be wrong. Most of the "failures" of worldwide sales of 275,000 (about 5%) were in the US!
Very interesting - sometimes the premix, non premix, oil, temperatures, coolant, engine blowing up etc. discussion just makes me tired. There must be tons of RX-8 owners out there not on this site driving their cars without any idea about this stuff - what in the world are they doing? It would be very interesting to actually get some solid statistics on engine failure rates for each year car. Sometimes I can't tell if we're all too paranoid on here, or if the Renesis really IS that bad that 100,000 is like a golden crown - if you can make it there, you're special (which is sorta sad and it stinks if it's true).
Nevertheless, I really enjoy that car.
P.S. Thanks for posting - it IS helpful to see the inside and we'd all definitely be curious of the fuel/premix/oil habits
Nevertheless, I really enjoy that car.
P.S. Thanks for posting - it IS helpful to see the inside and we'd all definitely be curious of the fuel/premix/oil habits
04-27-2010, 08:36 AM
#52
agree with all that///
Mazda made 2 big mistakes in US market. First was they priced this car too low. (Low price equals little owner respect). Second they really messed up with the oil spec....5w20 is hopeless!
I think over 120,000 RX8's were sold in the US since launch 2004, though I may be wrong. Most of the "failures" of worldwide sales of 275,000 (about 5%) were in the US!
Mazda made 2 big mistakes in US market. First was they priced this car too low. (Low price equals little owner respect). Second they really messed up with the oil spec....5w20 is hopeless!
I think over 120,000 RX8's were sold in the US since launch 2004, though I may be wrong. Most of the "failures" of worldwide sales of 275,000 (about 5%) were in the US!
On the other point above, yeah, the finiky-ness of the Renny stands in stark contrast to my 1978 RX-4 which ran forever with no special care or knowledge, made possible with 110 hp from 1.3l vs. 230 hp today.
04-27-2010, 09:53 AM
#53
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Great thread! thanks for the pics and explanation. i think more people should understand how the engine works and wears so they can do what they need to do to help prevent this type of thing on their own car.
04-27-2010, 10:27 AM
#54
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Haha, low price? 
Tell that to all the guys who bought Shinka's for $35,000.00 that are now worth $15,000.00 with less than 25,000 on the odometer. Or the guys who paid $30,000.00 for GT's that are now worth $13,000.00-$15,000.00.
the price of the car has nothing to do with respect, I know guys and gals with $100,000.00 cars and they treat them like ****.
Tell that to all the guys who bought Shinka's for $35,000.00 that are now worth $15,000.00 with less than 25,000 on the odometer. Or the guys who paid $30,000.00 for GT's that are now worth $13,000.00-$15,000.00.the price of the car has nothing to do with respect, I know guys and gals with $100,000.00 cars and they treat them like ****.
04-27-2010, 04:33 PM
#57
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We have more experience with the pre renesis rotaries in this matter. Premix is the only way to go on those engines, there is a night and day difference internally. Stock OMP will have a lot of carbon buildup, where a premix engine will at least half as much if not more. To me it appears the apex seals don't get enough lubrication on the Rx-8 engines, maybe a reason why the 09's have the center injector. I would run a few ounces even if sticking with the OMP on an rx-8. I believe premix only is the way to go...
04-28-2010, 12:12 AM
#58
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I'm looking back at the RX7 prices, which were up there with the Porsches. Don't look at the Shinka, that was just a marketing gimmick, which didn't work because Mazda were already selling a regular RX at a lower price! You made my point entirely with the second hand prices, these second and third hand cars were purchased cheap from 1st owners/trade ins, who probably abused them. Little wonder they needed rebuilding so soon!
I did read a funny point on a UK rx site, where someone posed the question as to why the 2nd 3rd or 4th engine rebuilds mainly were on re-builder's engines, sometimes just after a few thousand miles?
I did read a funny point on a UK rx site, where someone posed the question as to why the 2nd 3rd or 4th engine rebuilds mainly were on re-builder's engines, sometimes just after a few thousand miles?
04-28-2010, 09:21 AM
#60
I think the numbers are more like 75,000 US and 180,000 worldwide. Still, it's pretty small. Low price = low respect? Don't think so, how about Miata? Civic Si?
On the other point above, yeah, the finiky-ness of the Renny stands in stark contrast to my 1978 RX-4 which ran forever with no special care or knowledge, made possible with 110 hp from 1.3l vs. 230 hp today.
On the other point above, yeah, the finiky-ness of the Renny stands in stark contrast to my 1978 RX-4 which ran forever with no special care or knowledge, made possible with 110 hp from 1.3l vs. 230 hp today.
Cuz
about a year something 2 ago, NHTSA talked about The Clutch Bracket issue (I did it, YESSS!) and they said something like 40,000 RX-8 in the US might need be affected ... and Rx-8 is not selling like hot cakes so. yeah ,50K is more likely.
05-05-2010, 06:31 PM
#61
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We just did a compression test on this engine, 100psi @ 190rpms. That is over 120psi at 250 standard cranking rpms. We didn't grind the plates on this engine either, and the motor is still breaking in too..
I am curious to see how high we can get with the other two motors we are currently doing...
I am curious to see how high we can get with the other two motors we are currently doing...
05-05-2010, 07:14 PM
#62
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turblown. Thanks for this info it is great. I am about to hit the 47k mark on my 05. I am going to do its first plug, coil and wire change out here shortly.
I will start premixing my engine now because of this thread and the knowledge you have given us.
One thing I am asking is, even though I am coming close to 50k if i start premixing would it extend life of my engine or actually help decrease its life. Its probably best to start premix when the engine is new or rebuilt to get the full 100%. But I am not really too sure.
Also what would a rebuild of something like this cost?
I will start premixing my engine now because of this thread and the knowledge you have given us.
One thing I am asking is, even though I am coming close to 50k if i start premixing would it extend life of my engine or actually help decrease its life. Its probably best to start premix when the engine is new or rebuilt to get the full 100%. But I am not really too sure.
Also what would a rebuild of something like this cost?
05-06-2010, 11:25 AM
#63
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It will help if you start now. You don't have to do it from the get go. I will post some pictures of a Rx-7 engine we just tore down. Its been premixed and water injected from day one...
05-06-2010, 11:38 AM
#64
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In another thread this guy was laughing cause he got 100k+ and didn't change the oil after a while he just topped off. BUT what he didn't mention in there is what was going on. The filter probably got clogged and the relief valve opened up and his engine prob had better oil flow.
Last edited by VashGS; 05-06-2010 at 11:39 AM. Reason: fixed typo
05-08-2010, 01:47 AM
#65
Boostin'
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Well you guys wouldn't believe this. The new owner over heated the engine. He didn't replace the radiator hoses with installation and blew one while driving. We tore down the motor this morning and found two blown coolant seals. On the flip side its always nice to see inside our work after its been ran. I must say we all had smiles on our faces seeing the insides( besides the blown coolant seal obviously).
Moral of the story, don't be a cheap skate. If you car has 100k on it, expect do a lot of externals besides a new short block...
Moral of the story, don't be a cheap skate. If you car has 100k on it, expect do a lot of externals besides a new short block...
05-08-2010, 10:34 AM
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Well you guys wouldn't believe this. The new owner over heated the engine. He didn't replace the radiator hoses with installation and blew one while driving. We tore down the motor this morning and found two blown coolant seals. On the flip side its always nice to see inside our work after its been ran. I must say we all had smiles on our faces seeing the insides( besides the blown coolant seal obviously).
Moral of the story, don't be a cheap skate. If you car has 100k on it, expect do a lot of externals besides a new short block...
Moral of the story, don't be a cheap skate. If you car has 100k on it, expect do a lot of externals besides a new short block...
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