Engine blows up after 100k? I think NOT!
06-30-05, 11:11 PM
#1
Engine blows up after 100k? I think NOT!
Well, I was scared to death when my engine hit the 100k mile mark. Everyone keeps on telling me that these engines blow or needs a rebuild at around 100k.
Well, I bit the bullet and did a compression test today.
At 76% Humidity and 22C ambient temp, my engine tested the following
120-125-125psi front
125-120-120psi rear
Not too shabby would you say??
I have 230 000 km on the chassis and 160 000 km on the Mazda reman motor.
Oil changes every 4000 km, spark plug change every 15000 km.
BTW, I recently went to a dyno and pulled 142 rwhp an 112lbs/ft of tq.
Mods :
Stock exhaust manifold, gutted cat, stock exhaust.
Generic cone intake, Pineapple racing sleeves
S-AFC
Crane Hi-6R
SR Motorsports FD flywheel
ACT SS clutch
Turbo II transmission
FD Torsen rearend
BBS Vert rims
I think I can use alittle bit more tq.
Well, I bit the bullet and did a compression test today.
At 76% Humidity and 22C ambient temp, my engine tested the following
120-125-125psi front
125-120-120psi rear
Not too shabby would you say??
I have 230 000 km on the chassis and 160 000 km on the Mazda reman motor.
Oil changes every 4000 km, spark plug change every 15000 km.
BTW, I recently went to a dyno and pulled 142 rwhp an 112lbs/ft of tq.
Mods :
Stock exhaust manifold, gutted cat, stock exhaust.
Generic cone intake, Pineapple racing sleeves
S-AFC
Crane Hi-6R
SR Motorsports FD flywheel
ACT SS clutch
Turbo II transmission
FD Torsen rearend
BBS Vert rims
I think I can use alittle bit more tq.
Last edited by pd_day; 06-30-05 at 11:14 PM.
06-30-05, 11:16 PM
#4
Originally Posted by SonicRaT
No, he was talking about FD's probably. 
I just tested a FD's compression too.
Stock engine running stock boost.
90-90-90 psi front
85-85-90 psi rear
Weather was probably same humidity and at around 33C
He has 60k miles on stock engine.
Last edited by pd_day; 06-30-05 at 11:21 PM.
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07-01-05, 01:47 AM
#14
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I have 185K miles on mine, stock everything pretty much except for a few little tweaks (no exhaust, cone and whatnot no aftermarket fuel control) and i have 95 psi all faces. On my last dyno run i managed to squeze out 145whp and 124 lb/ft of torque. No loss of coolant into the motor or anything, i expect quite a few more miles out of this motor. BTW never listen to anyone that does not have experience with rotarys, 9 times out of 10 they will be wrong/retarded.
07-01-05, 03:04 AM
#15
any car/engine that is taken care of, not abused and maintained regularly and properly will last a nice time before any major work is to be done. plain simple fact. the reason someone may have told you this is because RX7's have a more likelyhood of abuse than say a honda accord
07-01-05, 03:21 AM
#16
Lives on the Forum
You're talking NA right???
NA's are good to at least 200k miles.
With good maintenance, 300k miles is not uncommon.
If this is a 13BT, then 100k to 150k miles is about average life.
This is especially true for those engines making more power than stock, especially with full exhaust systems.
-Ted
NA's are good to at least 200k miles.
With good maintenance, 300k miles is not uncommon.
If this is a 13BT, then 100k to 150k miles is about average life.
This is especially true for those engines making more power than stock, especially with full exhaust systems.
-Ted
07-01-05, 03:41 AM
#18
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200 - 300k on an N/A?
Is this with all stock parts or could this still be obtained with a RB street dual exhaust? I know it's a dumb question, but I'm curious. I'm looking forward to keeping this in good shape if I can obtain those numbers. Right now, at 89k on my N/A.
Is this with all stock parts or could this still be obtained with a RB street dual exhaust? I know it's a dumb question, but I'm curious. I'm looking forward to keeping this in good shape if I can obtain those numbers. Right now, at 89k on my N/A.
07-01-05, 04:38 AM
#19
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Originally Posted by Mura
200 - 300k on an N/A?
Is this with all stock parts or could this still be obtained with a RB street dual exhaust? I know it's a dumb question, but I'm curious. I'm looking forward to keeping this in good shape if I can obtain those numbers. Right now, at 89k on my N/A.
Is this with all stock parts or could this still be obtained with a RB street dual exhaust? I know it's a dumb question, but I'm curious. I'm looking forward to keeping this in good shape if I can obtain those numbers. Right now, at 89k on my N/A.
The upper limit of the engine with stock ECU is about 200 at the wheels.
Even with those elevated power levels, the 13B 6-port should be able to easily hit 200k miles with proper maintenance.
-Ted
07-01-05, 08:10 AM
#21
i think na is the best suitable fc for the street , thats why i love mine....hoping to get her started this weekend
as far as his tuning it looks to be too lean , if it was more rich i bet he would get more hp but he said its been tuned to 13.0 afr
edit - in my opinion reted is totally right these engine can last if you take care of it properly and dont beat on it , my 2 rx7s i have one suffered a blown coolant seal at 146,000 miles (s4 na), the other suffered blown apex seals at 113,000 (s4 na also) , probably due to lack of maintainence and being beat on alot
maintainence and oil changes are very important on rx7 , if u dont maintain it right and beat on it , it will show in the long run
as far as his tuning it looks to be too lean , if it was more rich i bet he would get more hp but he said its been tuned to 13.0 afr
edit - in my opinion reted is totally right these engine can last if you take care of it properly and dont beat on it , my 2 rx7s i have one suffered a blown coolant seal at 146,000 miles (s4 na), the other suffered blown apex seals at 113,000 (s4 na also) , probably due to lack of maintainence and being beat on alot
maintainence and oil changes are very important on rx7 , if u dont maintain it right and beat on it , it will show in the long run
Originally Posted by homebrewer
I concur, having owned 4 NA FCs I have never blown or wore out an engine.
Last edited by wthdidusay82; 07-01-05 at 08:14 AM.
07-05-05, 09:00 AM
#25
Engine, Not Motor
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Hell, I had ~250K on my engine when I turbocharged it. Ran it for another 10K after that, before I decided to pull it apart for the porting. The engine was original to the car (as was the clutch!).
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