What made this engine fail? - K20A.org .:. The K Series Source . Honda / Acura K20a k24a Engine Forum
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Old 02-21-2010, 01:03 PM   #1
btf
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Default What made this engine fail?

A buddy of mine with an 08 Si was driving downhill in 3rd gear full throttle, and before 4th gear he head a noise, then the oil light came on and it didn't start. the head was still intact but here are some pics of the block:
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File Type: jpg crack si 01.jpg (56.6 KB, 854 views)
File Type: jpg crack si 02.jpg (67.4 KB, 744 views)
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Old 02-21-2010, 01:12 PM   #2
idriveacoupe.
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Default Re: What made this engine fail?

hmmm 2008?


WARRENTYYY
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Old 02-21-2010, 01:21 PM   #3
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Default Re: What made this engine fail?

Looks like the rod seperated and came through the block.
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Old 02-21-2010, 01:21 PM   #4
drhonda
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Default Re: What made this engine fail?

ouch.

Hard to say without tearing it down.

was it raining?
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Old 02-21-2010, 02:16 PM   #5
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Default Re: What made this engine fail?

hydrolocked... or driver with severe racing habit
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Old 02-21-2010, 07:16 PM   #6
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Default Re: What made this engine fail?

Hmmz well 3rd gear, full throttle, just before 4th gear, down hill.

What was the engine rpm just before he shifted into 4th?
Yup, was it raining?
List of mods, if any?
Was the engine up to operating temperature?

From what I gather without tearing it apart, it could have been an over rev situation (3rd, WOT, downhill) that caused a rod to let go.

It could have also been a simple manufacture defect, the hardness of the metal regarding the conn. rod ie: metal hardened too much = brittle and vise versa.

Also even low oil pressure to that cylinder's rod and bearings would have caused a failure.

It could be a variety of issues . . . .

one word WARRENTY.
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Old 02-21-2010, 07:31 PM   #7
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Default Re: What made this engine fail?

sure he went to 4th and not 2nd I've seen this before from a 3rd to 2nd...

broke the rod in half and sent the piston into the head!
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Old 02-21-2010, 08:34 PM   #8
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Default Re: What made this engine fail?

deffinatley sounds like a misshift...alittle 3rd into 2nd instead of 4th eh!!

We would get these at acura all the time saying pretty much what you described.."oh we were just driving it in 3rd gear and it just shut off". Weird sir cause a rod is hanging through the ****ing bottom!!!

Cracks me up cause you could hold that motor at the rev limiter for prolly hours before something happened to it..... but 15,000rpm looks like your pics.
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Old 03-01-2010, 06:24 AM   #9
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Default Re: What made this engine fail?

Hmmm looks like wat happened to mine. Loss of oil pressure at high RPM. In my case top end of the track at about 8,500+ rpm. Same spot in the block too, only mine was sleeved
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Old 03-01-2010, 06:54 AM   #10
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Default Re: What made this engine fail?

The right foot stayed down. Thats what happened.
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Old 03-01-2010, 07:04 AM   #11
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Default Re: What made this engine fail?

Quote:
Originally Posted by rsmotors View Post
The right foot stayed down. Thats what happened.
I know mine was down
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Old 03-20-2010, 11:09 AM   #12
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Default Re: What made this engine fail?

i will have to personally agree with the option of say he when into 2nd gear, instead of 4th gear where he actually down shifted instead of just going into 4th gear. it has happen to many other driver who are not as experience with the new k shifting mechansims. you better have a good excuse for the warranty.
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Old 03-20-2010, 12:34 PM   #13
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Default Re: What made this engine fail?

If it was really steep, and he was low on oil to start with. (a lot of people don't realize that if they beat on their vtec car it will burn oil) I would say it ran low on oil, the rod heated up, bottom let go, and it eat the block.
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Old 03-20-2010, 12:35 PM   #14
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Default Re: What made this engine fail?

Quote:
Originally Posted by project_kcord View Post
i will have to personally agree with the option of say he when into 2nd gear, instead of 4th gear where he actually down shifted instead of just going into 4th gear. it has happen to many other driver who are not as experience with the new k shifting mechansims. you better have a good excuse for the warranty.
WOT at the Top of 3rd = I'm sorry sir, your warranty is void because you were racing the car.
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Old 03-20-2010, 01:09 PM   #15
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Default Re: What made this engine fail?

WOT down hill....hmmm, how may miles since last oil change. Im thinking its oil starvation
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Old 03-20-2010, 01:38 PM   #16
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Default Re: What made this engine fail?

I'm not up on my k20z3 pumps. I know they made the teeth smaller to fit more, but is it possible that it doesn't flow as well up top because of it's 2:1 rotation due to the balance shafts. So even the slightest unfavorable situation might lower OIl pressure to the point of failure.
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Old 03-20-2010, 02:31 PM   #17
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Default Re: What made this engine fail?

Quote:
Originally Posted by ninetysixek View Post
wot down hill....hmmm, how may miles since last oil change. Im thinking its oil starvation
+1
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Old 03-20-2010, 11:23 PM   #18
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Default Re: What made this engine fail?

Most likely oil related or miss shift than just a weak rod.
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Old 03-24-2010, 02:21 PM   #19
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Default Re: What made this engine fail?

all i know is that once my oil light came on .. holy shit .. my honda vent down hill very quickly... *note* (driving normally) i only made it a mile before shit it the fan.
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Old 04-09-2010, 07:18 PM   #20
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Default Re: What made this engine fail?

Many people don't realize oil consumption in any Honda has a max acceptable rate of 1 quart per every 3k! (that's Hondas word not mine) Which means, if you don't keep an eye on your oil level you may be runnin' too low! I just helped pull a pan on a 09Si 2day and the oil pump making tons of noise. The owner drove it like it was stolen all the time, and never checked the oil -the oil pump paid the price. I'm not sayin' ur bud did the same. Just sharin' my experience. If your within warranty -by all means take it to the dealer.
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