Just rebuilt my engine as I bought it with bottom end gone, got it on road last satutday and all was well, now a week in and it started knocking (not the same as bottom end a lot faster) doesn't come in staight away when I start it it takes around 30 seconds to start knocking then when revved to around 1500 revs it sounds like a slight rattling, I have a vid of it which I will post later as I'm on phone at min, before I noticed this noise, I would drive it and when I slowed down to a stop oil light flashed and cut out which I'm guessing means it was losing oil pressure, its a 95 wrx 2.0 t if that helps. Any ideas on what this is would be appreciatd thanks

Cal

 

Sounds like a big end bearing problem to me, especially if the oil light has come on, drop the oil into a clean container, drain it through a clean cloth if possible, if you have had a bearing problem again it will be contaminated with bronze debris from the bearings.

 

thats the vid of the noise

 

did you replace the oil modaline and what new part did you use

 

ye put genuine subaru modine on and a genuine subaru oil pump and acl main bearings and big end bearings

 

what oil did you use and did you fully fill filter? also where all conrods mated with the bottoms correctly, and did you have rods and crank checked?

 

Sounds very much like big ends to me, drop the oil as I said, it will only take 10 mins and you will know then.

 

its not poss just to rebuild if the crank is damaged, a polish at least is required. A slight fault or contamination in the block will destroy the work you have done.