Blew up a just rebuilt engine!! Why??
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Blew up a just rebuilt engine!! Why??
I finally got my engine back under the hood after porting and rebuilding it. I have (or had) new 2mm apex corner seal and everything was fine after first start. Engine runs smootly and the guy who rebuilt it drove about 10-20 miles before going to dyno to tune it. After a while something says BUM!! and first rotor lost its pressure. I´m so Fu**ing pissed off right now. What do you think what happened?
This happened full throttle and 10psi boost.
PS. See my sign and say whats wrong because car had ONLY 280rwhp until it blew up. If you ask me it should have been way over 300rwhp (330+ or something).
This happened full throttle and 10psi boost.
PS. See my sign and say whats wrong because car had ONLY 280rwhp until it blew up. If you ask me it should have been way over 300rwhp (330+ or something).
#3
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Originally posted by MaYnard5000
Engine wasn't broken in properly? 10-20 miles and then you dyno tune it? Doesn't sound like a good idea... How many miles was it until it blew up?
Engine wasn't broken in properly? 10-20 miles and then you dyno tune it? Doesn't sound like a good idea... How many miles was it until it blew up?
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Hey,
You need to do stick on the dyno just to get a Map into then you drive for a couple of thousand KM and it all should be fine. You never just go right out or else it will go boom.
Cheers
Chris
You need to do stick on the dyno just to get a Map into then you drive for a couple of thousand KM and it all should be fine. You never just go right out or else it will go boom.
Cheers
Chris
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it had about 70k miles before rebuilt and we didnt do anything else except corner seal and porting. I´m not sure did he push all the way because I wasn´t there so I can´t say much but I agree with you that you shouldn´t push very hard with a new engine. I have to ask him what was he doing (or thinking).
But what you think of the 280rwhp with those mods?
But what you think of the 280rwhp with those mods?
#7
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Your output was low most likely due to the motor being a fresh rebuild. It takes some time before everything gets worn in and good compression is made. I know on my rebuild, I make noticablly more power now after a few thousand miles then when i first put it in.
Pat
Pat
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Originally posted by Pattsy
Your output was low most likely due to the motor being a fresh rebuild. It takes some time before everything gets worn in and good compression is made. I know on my rebuild, I make noticablly more power now after a few thousand miles then when i first put it in.
Pat
Your output was low most likely due to the motor being a fresh rebuild. It takes some time before everything gets worn in and good compression is made. I know on my rebuild, I make noticablly more power now after a few thousand miles then when i first put it in.
Pat
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Originally posted by Faster Is Faster
we didnt do anything else except corner seal and porting.
we didnt do anything else except corner seal and porting.
#14
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Well if you didn't replace apex seals then maybe something went bad in that area.
I can only guess but maybe he put the rotors in the wrong chambers so the grooves and compression wasn't up to what it use to be since the seals would have worn into the shape of that housing.
Simple stuff though.
Running a monster right after assembly like that = bad
1st get on Dyno to slowly set AFR's tuned correctly
2nd break it in
3rd then get it tuned perfect.
I can only guess but maybe he put the rotors in the wrong chambers so the grooves and compression wasn't up to what it use to be since the seals would have worn into the shape of that housing.
Simple stuff though.
Running a monster right after assembly like that = bad
1st get on Dyno to slowly set AFR's tuned correctly
2nd break it in
3rd then get it tuned perfect.
#15
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Re: Blew up a just rebuilt engine!! Why??
Originally posted by Faster Is Faster
I finally got my engine back under the hood after porting and rebuilding it. I have (or had) new 2mm apex corner seal and everything was fine after first start. Engine runs smootly and the guy who rebuilt it drove about 10-20 miles before going to dyno to tune it.
I finally got my engine back under the hood after porting and rebuilding it. I have (or had) new 2mm apex corner seal and everything was fine after first start. Engine runs smootly and the guy who rebuilt it drove about 10-20 miles before going to dyno to tune it.
After a while something says BUM!! and first rotor lost its pressure. I´m so Fu**ing pissed off right now. What do you think what happened?
-Ted
#16
This is crazy! I can't think of anyone competent to build a rotary engine would then take it to the dyno after 20 miles of break-in and then boost to 10psi. Well, to answer your question, ignorance is what blew your motor.
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he said he had new apex seals. i didnt say it later when i quoted him earlier, but i saw it in a quote ted used and read it again (first post). still though. i dont know. either way.. a PERFECT rebuild taken to the dyno so quickly...
#20
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Originally posted by casio
he said he had new apex seals. i didnt say it later when i quoted him earlier, but i saw it in a quote ted used and read it again (first post). still though. i dont know. either way.. a PERFECT rebuild taken to the dyno so quickly...
he said he had new apex seals. i didnt say it later when i quoted him earlier, but i saw it in a quote ted used and read it again (first post). still though. i dont know. either way.. a PERFECT rebuild taken to the dyno so quickly...
EIther way I agree about the break in, you need to let the seals bed in. I have heard of people who build race engine (N/A, not turbo..) who flog them hard from the day they're all torqued up with fine results.. but thats N/A, and even then I think that's a bit dubious.
#21
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Originally posted by rxseven
This is crazy! I can't think of anyone competent to build a rotary engine would then take it to the dyno after 20 miles of break-in and then boost to 10psi. Well, to answer your question, ignorance is what blew your motor.
This is crazy! I can't think of anyone competent to build a rotary engine would then take it to the dyno after 20 miles of break-in and then boost to 10psi. Well, to answer your question, ignorance is what blew your motor.
#22
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Hey guys, maybe we're jumping the gun here?
Maybe the engine was broken in on a engine dyno stand before it was installed?
That would make a driving break-in unnecessary?
-Ted
Maybe the engine was broken in on a engine dyno stand before it was installed?
That would make a driving break-in unnecessary?
-Ted
#23
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I'd guess the engine blew from improper tuning.
If you reuse the housings with new seals, you should break in the engine so everything seats together properly.
If you reuse the housings with new seals, you should break in the engine so everything seats together properly.
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