cashyn

hi guys im after some advise i have just rebuilt my engine after ring land failure i have fitted 100mm piston (ej25) whilst it was in bits i had the crank polished to suit new acl bearings i set all the valve clearances to subaru guilde lines but theres a slight knock or tapping whilst its idling as soon as its reved it clears ive checked the oil pressure and on cold idle its 7 bar this goes down to 3.5 when hot on idle and 6 when reved ive been told to run in on 15/40 oil by the company who i bought the parts off i dont know if this is correct ? but i dont know where to go from here should i run it and see if it clears ? and risk knacking it up again or do i pull down please advise cheers

wrxcook

Piston slap if you put in forged pistons I posted a similar post earlier, after fitting forged pistons I've had this and have done over 10k the replys I get earlier said this was normal which was what my mapper said aswell

cashyn

hello and yes they are mahale pistons thanks for advice cheers

prodriverules

iTrader: (52)

All I can say is that I'm yet to hear a subaru engine that I would call 'quiet' tbho and that is whether it is forged or not but when they are forged it just becomes worse

eclipse performance

iTrader: (5)

Could be piston slap, its very common. I would just whip your timing belt covers off and check cam bolts are tight. Had one in a few weeks ago that the customer had built himself. It had the same sort of noise & when we checked the cam pulleys we found one of the bolts was loose!!!

Also, you need Millers CFS 10/60 or Silkolene Pro R 15/50 Engine oil. 15/40 wont work very well when cold - it will take a bit of warming up and wont take a lot of abuse!

happydude303

iTrader: (1)

i would put a vid up of this tapping as it may be your pistons or it coudl be somthing elese have you got the right size head gaskets in there coudl be that does it go away when warm and yes forged engine can be nosiy

LewisScoob

iTrader: (5)

Pardon my ignorance but the viscosities of 15/50 and 15/40 when cold are the some, no?

newby

iTrader: (2)

i have the same problem after fitting my rebuilt engine but the noise goes when the engine warms up.so is this piston slap?

prodriverules

iTrader: (52)

Its just the down side to forged engines I'm afraid,sadly some are noisier than others.
Mine is quite noisy but you get used to it tbho

wrxcook

+1

merlin24

iTrader: (1)

What did you set the valve clearances to ??

Mick

cashyn

hi inlets were 7-8 tho and exhaust were 9-10 however one exhaust was 11 but still in spec thanks