Brand New Engine Toast
#1
Junior Member
Thread Starter
Brand New Engine Toast
Hey all,
I'm in a situation where a engine was bought and installed by a shop, they ordered it brand new from Mazda. I broke it in for about 2000k miles and the limiter was set at 4.5k the whole time. I brought it back for the final tune. After picking it up from the tuner/ installer, I was able to drive it 45 min before it lost power. The car was on the highway doing 80 in 4th when I accelerated and at 100 it just lost power. I was around maybe 6.5k rpm? I limped it back to the installer and he tore it apart. I'm not super knowledgeable about rotary's. He is saying that the edge of the rotor hit the housing and it needs a new rotor and housing, and that the tune they did or the install had nothing to do with that. He is stating that's common of a missed shift / over rev with the Power FCs. They set the rev limiter to 7.5k, which I don't know if that matters. It has been over 1 year since they ordered the engine so I'm out of luck with Mazda. He is saying he will pay for labor, but I would have to buy the parts. Is this scenario reasonable? I'm reaching out to see if the edge of the rotor hitting the iron is indicative of that. I'm not going to say the shop, they have been accommodating, I'm really looking for knowledge If that is a common cause for a big failure like that.
I'm in a situation where a engine was bought and installed by a shop, they ordered it brand new from Mazda. I broke it in for about 2000k miles and the limiter was set at 4.5k the whole time. I brought it back for the final tune. After picking it up from the tuner/ installer, I was able to drive it 45 min before it lost power. The car was on the highway doing 80 in 4th when I accelerated and at 100 it just lost power. I was around maybe 6.5k rpm? I limped it back to the installer and he tore it apart. I'm not super knowledgeable about rotary's. He is saying that the edge of the rotor hit the housing and it needs a new rotor and housing, and that the tune they did or the install had nothing to do with that. He is stating that's common of a missed shift / over rev with the Power FCs. They set the rev limiter to 7.5k, which I don't know if that matters. It has been over 1 year since they ordered the engine so I'm out of luck with Mazda. He is saying he will pay for labor, but I would have to buy the parts. Is this scenario reasonable? I'm reaching out to see if the edge of the rotor hitting the iron is indicative of that. I'm not going to say the shop, they have been accommodating, I'm really looking for knowledge If that is a common cause for a big failure like that.
Last edited by Matthew Smith; 01-14-23 at 05:48 PM.
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Nakd n Fearless (12-19-23)
#3
Junior Member
Thread Starter
#5
Junior Member
Thread Starter
I won't be sharing the shop as they have been working with me on this build for a while. They've been decent for communication almost every time I call and for the most part fairly transparent with the overall build. I was going to post a positive review of the shop before all this went down. I'm certain that if it was just a blown Apex seal the shop would have taken and just did it for free, I think what's pushing this to this level is the fact of the price of a new rotor and rotor housing, as we know the cost of those items.
#7
Junior Member
Thread Starter
Modifications include upgraded fuel pump, fuel system lines were done in the engine pay ,1300 secondary cc's injectors 900 primaries, harness redone by rywire, Power FC, new engine, new turbos. The engine was dropped in as is from Mazda from my understanding. I will say that in the process of the rebuild rather than replace the lines we ended up going with the non-sequential set up for the stock twins. Initially I had a greddy intercooler that fit in place of the stock one and the stock air box which is why it was limited for the break in. When I brought it back to him, we finished by going with a V-Mount set up with custom air intake. The initial build put out 309 to the wheels at 14 lb on the stock twins.
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#9
Rotor or no motor
iTrader: (24)
Sounds like a bad tune and it sounds like the shop doesnt know what they are doing
how old was the fuel in the car?
the edge of the rotor touched the housing and because of that you need a new rotor and a housing? Wtf … over revved and it is common with the pfc?
these moronic excuses are a huge red flag and it sounds like you got screwed
how old was the fuel in the car?
the edge of the rotor touched the housing and because of that you need a new rotor and a housing? Wtf … over revved and it is common with the pfc?
these moronic excuses are a huge red flag and it sounds like you got screwed
Last edited by R-R-Rx7; 01-14-23 at 04:54 PM.
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#11
Junior Member
Thread Starter
Looking forward to the input on the pics, I should hopefully have them Monday. Harness was ordered and installed somewhere around April 2022.
#12
Junior Member
Thread Starter
Sounds like a bad tune and it sounds like the shop doesnt know what they are doing
how old was the fuel in the car?
the edge of the rotor touched the housing and because of that you need a new rotor and a housing? Wtf … over revved and it is common with the pfc?
these moronic excuses are a huge red flag and it sounds like you got screwed
how old was the fuel in the car?
the edge of the rotor touched the housing and because of that you need a new rotor and a housing? Wtf … over revved and it is common with the pfc?
these moronic excuses are a huge red flag and it sounds like you got screwed
I'm not super knowledgeable about rotary's and did the homework to get by most of problems I faced. Im looking to your guys knowledge on this front with the way the casualty happened.
#13
Junior Member
Thread Starter
#14
Original Gangster/Rotary!
iTrader: (213)
Unless you rev'ed the engine to 10,000 rpm, rotors should not be hitting housings. This was a new engine? As in, new bearings? Did the shop verify endplay? What kind of oil were you running, and you verified the level was correct?
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Howard Coleman (01-18-23)
#15
Junior Member
Thread Starter
That makes more sense to me. I watch people really put the 13b to work and have not heard about a rotor hitting the housing. Mainly a seals issue which is interesting. Good questions, and I can ask the shop themselves for the endplay. The engine was new shipped from Japan from what I understand. Not fully aware of the specifics on that. He stated a brand new or at least we paid around $5800 at the time in AUG 2021 for it. He instructed me 20w 50 oil and I have ran that from the start. The level was correct but here is the catch. Due to the excessively rich fuel tune , which I will ad was not that way when i drove away from the shop, the car was having pretty agressive F.O.D. I could smell fuel in the oil. I did some research and from what I understand this is common to a degree, although it seemed mainly from hard driving on the track. I never took it to the track as it was limited. The oil level was good. Oil metering pump was still in place. I dont think thats a factor but I will add it just incase. I ended up changing the oil once after it returned home. I was not comfortable with the level of FOD after driving it for awhile and changed the oil at some point during those 6 months again. I then changed the oil right before the drive down. Mainly for my comfort and my recognition that the tune was too rich.
#16
Original Gangster/Rotary!
iTrader: (213)
Do you have a wideband o2 so that you can quantify how rich the car was running?
I've torn down many reman and new Mazda engines over the years for street porting and other performance work and the side seal to corner seal clearance is typically too loose, which will lead to excessive fuel dilution in the oil.
I've torn down many reman and new Mazda engines over the years for street porting and other performance work and the side seal to corner seal clearance is typically too loose, which will lead to excessive fuel dilution in the oil.
#17
Junior Member
Thread Starter
Do you have a wideband o2 so that you can quantify how rich the car was running?
I've torn down many reman and new Mazda engines over the years for street porting and other performance work and the side seal to corner seal clearance is typically too loose, which will lead to excessive fuel dilution in the oil.
I've torn down many reman and new Mazda engines over the years for street porting and other performance work and the side seal to corner seal clearance is typically too loose, which will lead to excessive fuel dilution in the oil.
#18
Rotor or no motor
iTrader: (24)
Do you have a wideband o2 so that you can quantify how rich the car was running?
I've torn down many reman and new Mazda engines over the years for street porting and other performance work and the side seal to corner seal clearance is typically too loose, which will lead to excessive fuel dilution in the oil.
I've torn down many reman and new Mazda engines over the years for street porting and other performance work and the side seal to corner seal clearance is typically too loose, which will lead to excessive fuel dilution in the oil.
thats an issue for the long run. Not blow up the engine 45 minutes later.
and since this is brought up i have over revved my engine way past the 11k-12k rpm and I haven’t had this “common outcome” even with the power fc. (Glorious moneyshifts during my more active track/racing years lol).
i have been lucky i am not going to deny that. i am not saying that it can’t happen but i have seen these results with a simple case a bad tune and with a slight benefit of the doubt, with old fuel in the car but the engine was broken in for 2k miles so its not that
This is a classic case of detonation where the tuner is probably a piston engine tuner and possibly inexperienced with tuning of the rotary engine. I havent even seen the tune but i am willing to bet that given the information from the OP thats what it is
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gracer7-rx7 (01-15-23)
#19
Junior Member
Thread Starter
Rich
thats an issue for the long run. Not blow up the engine 45 minutes later.
and since this is brought up i have over revved my engine way past the 11k-12k rpm and I haven’t had this “common outcome” even with the power fc. (Glorious moneyshifts during my more active track/racing years lol).
i have been lucky i am not going to deny that.
This is a classic case of detonation where the tuner is probably a piston engine tuner and possibly inexperienced with tuning of the rotary engine. I havent even seen the tune but i am willing to bet that given the information from the OP thats what it is
thats an issue for the long run. Not blow up the engine 45 minutes later.
and since this is brought up i have over revved my engine way past the 11k-12k rpm and I haven’t had this “common outcome” even with the power fc. (Glorious moneyshifts during my more active track/racing years lol).
i have been lucky i am not going to deny that.
This is a classic case of detonation where the tuner is probably a piston engine tuner and possibly inexperienced with tuning of the rotary engine. I havent even seen the tune but i am willing to bet that given the information from the OP thats what it is
Understandable guess given the information I provided. I can say that the shop I'm referring too only works on rotarys. Something I did not mention earlier was that the shop did not tune the car themselves, but had a remote tuner, who has a great history tuning these cars.
#20
The motor should be easily broken in well before a few hundred miles, let alone 2K miles. For future reference: You also don't want long periods of time cruising at a given rpm. You want to always vary the load from accelerating and declarating.
#21
Lives on the Forum
iTrader: (9)
It sounds more like you found a spot in the map that wasn't tuned right, i.e. a condition of load/rpm/boost that hadn't been encountered and addressed during whatever tuning they did, or a hickup in fuel pressure, and pop goes the weasle.
The new rotor and housing is for the damage a broken seal caused, and covering the labor intended to keep you from asking too many questions or talking about it.
The new rotor and housing is for the damage a broken seal caused, and covering the labor intended to keep you from asking too many questions or talking about it.
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#22
Senior Member
iTrader: (16)
This ^^.
Also, when you purchase a brand new shortblock from mazda they come with a 1 year / 12k miles warranty. I verified this with my account at Mazda. Not sure why the shop tore it down rather than just simply getting a replacement sent ( I understand they were on backorder forever ). If I were you I would see about a replacement under their warranty and find another shop that is rotary specific tuning.
~ GW.
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losing_rx7 (01-16-23)
#23
Junior Member
Thread Starter
Hey all,
Thanks for the guidance on this situation. I was able to get the pics by the builder/installer. It seems valid on what I see but I would love you all to let me know what you have seen after a failure like this.
Here are pics below:
Thanks for the guidance on this situation. I was able to get the pics by the builder/installer. It seems valid on what I see but I would love you all to let me know what you have seen after a failure like this.
Here are pics below:
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milesrx7 (01-18-23)
#24
Rotary Motoring
iTrader: (9)
They broke an apex seal tuning it and handed ot back to you where it came apart enough to slow you down 45 min later.
When it ran rich and sounded like a bridgeport the engine was already blown, just didnt have the collateral damage of running a blown engine yet.
Proof is in the pics.
When it ran rich and sounded like a bridgeport the engine was already blown, just didnt have the collateral damage of running a blown engine yet.
Proof is in the pics.
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