3rd motor blown in 1 year
12-24-05, 04:08 AM
#32
Originally Posted by KevinW
i have bought 2 j spec motors that were really clean and pulled awsome vac. started right up never smoked. i use shell or chevron and sometimes 76. they have 100 at the pump here.
There's your problem right there. The old original engines have the crappy 3 piece apex seals. These seals get very brittle over time and break easier compared to the more structurally sound older 2 piece design. Some seals break from just being stuck from carbon with no detonation. Ask me how I know. My S5 NA engine has been rebuilt twice within 140k miles all because of carbon related issues. J-Spec engines (especially the auto Cosmo engines) tend to have heavy carbon deposits because those engines operate with the automatic transmission. People just don't run those engines hard enough with the automatic. Just because you think the engine is clean and pulling good vacuum, doesn't mean that it's in good enough condition to be run and modified. The carbon still needs to be cleaned out. When you install an un-opened engine like this in your car, the carbon deposits will eventually break away from the rotor faces and sometimes can cause apex seal breakage because of the carbon chunks being thrown around the rotor chamber. A good tune from Steven isn't going to prevent this. Your best bet with the J-spec engine is to go ahead and open it up to clean and spec everything. While your in there, go ahead and replace the apex seals with the new 2 piece ones. Then get the injectors cleaned and flow tested to make sure that they are flowing as they should. Clogged injectors can and will cause a boosted rotary to blow. Again a perfect tune can't prevent that from happening.
Last edited by t-von; 12-24-05 at 04:29 AM.
12-24-05, 09:00 AM
#34
12-24-05, 09:35 AM
#35
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Originally Posted by GoodfellaFD3S
I have popped 6 motors with hurley seals. If you fart too hard while WOT, they will break. seriously.
12-24-05, 10:00 AM
#37
I went through 7 motors when I had my rx-7. The first was coolant seal failure. The 2nd was an improperly set intake temperature correction setting and heat soak, then running the 1/4 mile. The next five I could not find the source of. I think you have some sort of intermittant electrical problem in your car. Aside from the things everyone else said I would look at these: It could be in the engine harness or body harness. I would replace both. I would also replace all your fuel injectors or at least send them out to be serviced. I'd also switch the fuel pump and wire it to constant 12v via some relays. Maybe even swap ecus. I'm pretty sure thats what my car had. It would run great for a few thousand miles. Then all of the sudden detonate and blow. I got tired of looking for the problem so I sold the car. Good luck. This might be a tough one to find. If I had to do it again I'd do an LS1 swap.
12-24-05, 10:24 AM
#38
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Originally Posted by GoodfellaFD3S
I have popped 6 motors with hurley seals. If you fart too hard while WOT, they will break. seriously.
12-24-05, 10:42 AM
#40
3rd motors a charm I hope
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3 motors in one year suggests something other then the obvious is wrong. I had blown 2 motors in one year and they were both fresh rebuilds. After switching from my old power fc to a full microtech setup, i found that one of my injector clips were shot. The wire was barely connected and the clip was broken. This could be the case for you. So assuming that you are running a power fc, i would suggest either buying a new wiring harness for the car (since the old one is probably shot, anyways) or going to a new ecu that comes with its own wiring harness (which actually can be cheaper after selling your power fc)
12-24-05, 01:03 PM
#41
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Originally Posted by LUPE
I've got bad gas too, literally.......... if you want to run hurley seals you'll need a good colin cleansing every week or so.
12-24-05, 01:18 PM
#42
silver ghost
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Originally Posted by GoodfellaFD3S
I have popped 6 motors with hurley seals. If you fart too hard while WOT, they will break. seriously.
12-24-05, 01:41 PM
#43
Originally Posted by Improved FD
where is a good link on how to do this??
Its DSM specific instructions but the basics are the same... www.vfaq.com go to fuel then fuel pump rewire.
12-24-05, 03:08 PM
#44
12-24-05, 03:09 PM
#45
Original Gangster/Rotary!
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Originally Posted by Improved FD
where is a good link on how to do this??