ĄĄĄĄĄĄUPDATE 08/30/2012!!!!!!!!!!!!!!!!

After change everything in my engine (main and rod bearings), balance shaft removal and check everything (head, short block), we turn on the engine and the noise is there ! sucks!!!!!!!!!!!

We turn off the trans gear and found some loose bolts on the flywheel but the most impresive was my flywheel with the crank stuck! Hereīs the pics... Flywheel is borned.

What do you think that I need to do?



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Hello guys...

I ran my car this past two weeks in quater mile with no issues.

Last race (one sunday) I made some drag races and the car run perfect, after that I put the car in my garage... Five days later I started the engine and motor sounds with knock in the head. Today, my mechanic remove the cover and all was perfect in the head. Then, we take off the oil pan (short block) and find some metal parts there. Was 4 oil squirters jet... (pics attached).. My engine was rebuild last year (April 2011), and the last two or three month I race my car with VP Q16 with 500whp+ with no issues...

I would like to know what might cause this problem... I took a look to main bearings and rod bearings and I think need to be changed. Crankshaft is in good condition.

Here is a video of the noise...
http://www.youtube.com/watch?v=U617Q...ature=youtu.be

 

So the tubes from the oil squirters were snapped off and sitting in your pan?

 

The oil squirter were in the oil strainer (I think this is the name)... If the oil squirters are in the oil stainer, why the sound so loud?

 

 

I have seen this happen to my engines as well.
I believe that vibrate and snap off. very likely when balance shafts are removed.

has nothing to do with engine making noise.
main bearings look fine. what do rod bearings look like?

 

was the rod bearings... I will post some pics tomorrow. Pistons are fine, we thinks some parts of the oil squirts damage the main and rod bearings

 

Looks to me like your awesome mechanic tried to build you a stroker but failed miserably.

 

Here some pics of rod bearings and main...

BTW, balance shaft are not removed...

 

Obviously, somethings hard got in the bearings. The oil filter should catch all of whatever this was. So either the engine was assembled with junk in the galleries or you need to run a better oil filter (one where the bypass valve stays shut).

 

Thanx man!! I will looking some good oil filter like Mitsu OEM filter. The engine has more than one year running without issues... I think the oil filter also had to do with it.

 

there is nothing wrong with the bearings other tan they passed some good size debris. the factory oil filter setup is not full flow by design. so any trash that gets to pan can make it to bearings quite easily.

full flow filter is when all the oil has to pass through the filter.
factory filter are bypass design. oil freely flows around filter. eventually all the oil goes through filter, but it takes time.

you wont find full flow filters on passenger car engines. when filter get clogged oil pressure would drop.

your biggest problem with this engine was likely balance shaft bearing wear. those bearings do not pass debris well at all.

 

Well Mitsu says it is a full flow filtration system. I'm thinking they should know. If it wasn't what would be the purpose of running a filter?

Anyway, my guess is that the debris came from the block - not caused by the oil filter. Maybe the OP can tell us how the engine failed necessitating the rebuild.

 

Thanx for your answers guys!

Today I get the new ACL main and rod bearings to assamble the engine again. I hope that is only for the engine that fits well and does not give me any other issues. Also, I need to install a new oil squirts, because the four were broken.

I need to modify the squirts to avoid collision with the piston, which I think was what affection to break and damage the engine...

 

One solution is to leave them out. They are nice to have but not if causing problems. Other people have done this. Search for what they have to say.

 

I considered this option to remove previously, but I would feel safer if I leave the squirts...

I run my car only in 1/4 mile, but sometimes I need to drive 100 or 200 KM to race tracks and I donīt know if I remove the squirts the engine will have problems with piston temperature?