Yota engine goes bang
Discussion
The dreaded weakness of the yota engine to buzzing rears it ugly head again.
http://www.youtube.com/watch?v=xX2DOu1pj2k
Poor SpeedyK - the car is a Bemani Exige S2. I hope he gets it sorted. New engine required.
http://www.youtube.com/watch?v=xX2DOu1pj2k
Poor SpeedyK - the car is a Bemani Exige S2. I hope he gets it sorted. New engine required.
Ah yes... instant destruction of the oil pump (inner & outer drive rotors) when these engines are over rev'd on downchange, this IS the commonly known weakness... & BEMANI SHOULD KNOW THIS !
Apart from the sound which is the tell tale sign, if you look, the oil light comes on (no pressure) just before the MIL light. Hmm... instant death !
Sorry to say this... for everyones reference there is an upgraded part available over in the US to combat this.
Apart from the sound which is the tell tale sign, if you look, the oil light comes on (no pressure) just before the MIL light. Hmm... instant death !
Sorry to say this... for everyones reference there is an upgraded part available over in the US to combat this.
Tina K said:
Stonie said:
Sorry to say this... for everyones reference there is an upgraded part available over in the US to combat this.
Which is...?Oil starvation (typically) wont destroy the oil pump, it starves the bottom end of oil and you end up with big end and main engine bearings "going south". As the whole lot is ballanced and custom fitted for each engine it is very difficult to replace unless you have the specific balancing and machining processes that are present at the manufacturers.
The typical condition for this is low oil and bad downshift causing a "buzz". The engine revs rise above the rev limit. It only has to be a short time to cause SERIOUS damage.
The 6 speed box can be a little tricky to get used to and while aiming for 5th, 3rd can often be found by mistake, lift the clutch on that and you have a buzz.
Interestingly (roumour has it) toyota never encountered this untill the engine was put into the hands of a Lotus driver.
piooly said:
shangani said:
Oh well, I won't criticise now that I have the dreaded HGF.
No way, not you too !!! Whats with these HGF failure, everyone's got them these day, first lotustuart, then me, now you ! Hope the damage is not too bad.
This is not to mention my damaged front clam where my neighbours lodger backed into the car.
There is a crack in the centre and the numberplate plinth.
Ooops, sorry... Circuit Worx oil pump gear @ USD225, http://www.circuitworx.com
Gooby, you're right about oil starvation not destroying the oil pump, but this in not the problem. It's "buzzing" the engine (as you rightly stated) that will cause the damage, by destroy the oil pump first which immediately leads to no oil pressure (warning light), oil starvation and then bearing failure, especially when you re-load the engine by accelerating immediately after downchange.
The reason for oil pump destruction is the same old story... "COST" (of manufacture). On the upside, the oil pump rotors in the Toyota's are made from a 'sintered' material which is cheap to manufacture. The downside, these
'sintered' components are just not upto the job of high rev's when you "buzz" the engine. This is why Circuit Worx have produced their's from steel billet.
By the way and just for a laugh, if anyone from Toyota is reading this... they know they've got a problem with their oil pumps now !
Gooby, you're right about oil starvation not destroying the oil pump, but this in not the problem. It's "buzzing" the engine (as you rightly stated) that will cause the damage, by destroy the oil pump first which immediately leads to no oil pressure (warning light), oil starvation and then bearing failure, especially when you re-load the engine by accelerating immediately after downchange.
The reason for oil pump destruction is the same old story... "COST" (of manufacture). On the upside, the oil pump rotors in the Toyota's are made from a 'sintered' material which is cheap to manufacture. The downside, these
'sintered' components are just not upto the job of high rev's when you "buzz" the engine. This is why Circuit Worx have produced their's from steel billet.
By the way and just for a laugh, if anyone from Toyota is reading this... they know they've got a problem with their oil pumps now !
I was wondering how long it would take until this would make it to PistonHeads.
Anway, I've already passed on my condolences to SpeedyK...
Just to set some facts straight: It was the buzzing that did the damage - nothing really because of the S/C. As I'm sure others can confirm, there are other blown engines from buzzing the engine without any S/C. Still a very unfortunate way to find out how quickly it can happen.
Anway, I've already passed on my condolences to SpeedyK...
Just to set some facts straight: It was the buzzing that did the damage - nothing really because of the S/C. As I'm sure others can confirm, there are other blown engines from buzzing the engine without any S/C. Still a very unfortunate way to find out how quickly it can happen.
- EDIT*
Edited by Phil-CH on Thursday 7th June 12:44
Stonie said:
Ooops, sorry... Circuit Worx oil pump gear @ USD225, http://www.circuitworx.com
Gooby, you're right about oil starvation not destroying the oil pump, but this in not the problem. It's "buzzing" the engine (as you rightly stated) that will cause the damage, by destroy the oil pump first which immediately leads to no oil pressure (warning light), oil starvation and then bearing failure, especially when you re-load the engine by accelerating immediately after downchange.
The reason for oil pump destruction is the same old story... "COST" (of manufacture). On the upside, the oil pump rotors in the Toyota's are made from a 'sintered' material which is cheap to manufacture. The downside, these
'sintered' components are just not upto the job of high rev's when you "buzz" the engine. This is why Circuit Worx have produced their's from steel billet.
By the way and just for a laugh, if anyone from Toyota is reading this... they know they've got a problem with their oil pumps now !
Once again.... and I'm going to sound shitty now... but saying Toyota have a problem with their oil pump when it only breaks if the engine is over revved is a bit rich IMHO. When I raced most of the engines would have the rev limit set just below the explode point, if you over rev, it goes pop... ok, so you can uprate the oil pump, but then I bet the next item will be value train failure... just don't buzz it??? In the video the driver is looking a bit 'rushed' tbh and could do with calming down a bit and driving within his abilities?Gooby, you're right about oil starvation not destroying the oil pump, but this in not the problem. It's "buzzing" the engine (as you rightly stated) that will cause the damage, by destroy the oil pump first which immediately leads to no oil pressure (warning light), oil starvation and then bearing failure, especially when you re-load the engine by accelerating immediately after downchange.
The reason for oil pump destruction is the same old story... "COST" (of manufacture). On the upside, the oil pump rotors in the Toyota's are made from a 'sintered' material which is cheap to manufacture. The downside, these
'sintered' components are just not upto the job of high rev's when you "buzz" the engine. This is why Circuit Worx have produced their's from steel billet.
By the way and just for a laugh, if anyone from Toyota is reading this... they know they've got a problem with their oil pumps now !
Phil-CH said:
shangani said:
The dreaded weakness of the yota engine to buzzing rears it ugly head again.
Just to set some facts straight: It was the buzzing that did the damage - nothing really because of the S/C. Not as many as K series HGF mind you, but many times more expensive to fix.
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