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02-04-2013, 12:26 PM | #1 |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Piston Slap on fresh built motor?
This is regarding my 2008 STI. Stock fuel delivery. FP HTA Green, FIC 900s, TGV Deletes, TurboXS catless TBE, Up pipe w/38mm EWG, + most general name brand/quality supporting mods (no eBay parts).
BACKGROUND: Had a Cosworth short block installed. Seems to have a noticeable amount of piston slap. I lost a decent amount of oil and the engine got a little hot one day. It didn't overheat and it hasn't seen boost since its been being broken in. My question is, considering my lack of experience with built motors, is this normal? Should I be concerned? It is noticeable at idle but not under throttle nor does it get worse under throttle. My main concern would be when it does get tuned would the slap cause any damage down the road. The short block was built new from Cosworth and professionally installed. On a side note, do you guys notice a lot of hesitation or stumbling on built motors? I went pretty conservative with mods but replaced most performance parts. I was told I need rails/fpr but saw the 3' fuel line extension mod can remedy the situation with some tuning as well. Any thoughts/recommendations? Thanks
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02-04-2013, 12:35 PM | #2 |
Scooby Newbie
Member#: 47872
Join Date: Nov 2003
Chapter/Region:
MAIC
Location: NOVA
Vehicle:04 STI JBP HTA3586 5XX WHP 93oct |
Is it Cosworth pistons. I had cosworth in the past and they are very quite pistons compared to the cp's i have used in the past.
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02-04-2013, 12:36 PM | #3 |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
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02-04-2013, 12:57 PM | #4 |
Scooby Newbie
Member#: 336241
Join Date: Oct 2012
Chapter/Region:
MWSOC
Location: Colorado, New Mexico
Vehicle:08 Sti OPB |
Just goin off my build forged bottom end with cp pistons, I do not get any noticeable piston slap with the motor and zero oil consumption or to the point it not noticeable every 2600miles.
Do you only get the slap when the car is cold? Or also when it is warm? Keep in mind the forged material is much harder then the cast so is noiser and should quiet up as it warns up. |
02-04-2013, 01:08 PM | #5 | |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Quote:
EDIT: This was taken yesterday (Sunday). I need to replace the aftermarket BOV for stock BPV if that makes a difference :/ https://www.youtube.com/watch?v=fR8J...e_gdata_player |
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02-04-2013, 01:29 PM | #6 |
Scooby Newbie
Member#: 336241
Join Date: Oct 2012
Chapter/Region:
MWSOC
Location: Colorado, New Mexico
Vehicle:08 Sti OPB |
I sent you a pm and a video link of my car on a cold startup, it sounds fine to me but I am by no means a expert.
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02-04-2013, 01:30 PM | #7 |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
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02-04-2013, 01:48 PM | #8 |
Scooby Specialist
Member#: 279525
Join Date: Apr 2011
Chapter/Region:
Tri-State
Location: QUEENS NY
Vehicle:06 Fxt |
U my friend have a mild case of piston slap.. I am no expert as well but ive been dealing with the same noise for about 15k miles on my built block now..
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02-04-2013, 02:16 PM | #9 | |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Quote:
I'm glad its nothing terrible. |
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02-04-2013, 02:24 PM | #10 | |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
Quote:
What? Who told you to stay out of boost during break-in? The engine NEEDS boost to seat the rings before the crosshatching wears down and break-in ends. Piston slap is more or less normal on built motors, HOWEVER it should be louder when the engine is cold and go away when the engine is warm. This is because the forged pistons expand more when warm than the stock pistons. This means that in order to have the same clearance when the engine is warm, you must have more clearance when it's cold, which leads to some slap before the engine gets up to temp. I'm not sure what to think if yours is behaving the opposite. |
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02-04-2013, 02:32 PM | #11 | |
Scooby Specialist
Member#: 279525
Join Date: Apr 2011
Chapter/Region:
Tri-State
Location: QUEENS NY
Vehicle:06 Fxt |
Quote:
Only issue i can think of was a busted oem radiator. Besides the noise complaint, cant think of anything to worry u. I also dont get too much oil consumption to speak of. My tuner , sti mikey said the noise is pretty normal, nothing to worry about. Was tuned by him at efi, did 273 whp on low reading dyno and 330 tq. |
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02-04-2013, 02:33 PM | #12 | |
Scooby Specialist
Member#: 279525
Join Date: Apr 2011
Chapter/Region:
Tri-State
Location: QUEENS NY
Vehicle:06 Fxt |
Quote:
Any issues performance or mechanical wise? Short term/long term issues? Anything besides the noise complaint? Your experience and input is much appreciated So far no issues. Drove it to Arkansas n back from NY during break in. It saw 5-7 lbs of boost. No issue. So far no mechanical or performance isuues in the +15k miles its been running. Only issue i can think of was a busted oem radiator. Besides the noise complaint, cant think of anything to worry u. I also dont get too much oil consumption to speak of. My tuner , sti mikey said the noise is pretty normal, nothing to worry about. Was tuned by him at efi, did 273 whp on low reading dyno and 330 tq. |
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02-04-2013, 02:50 PM | #13 | |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Quote:
Replaced the oil. No shavings/coolant in the oil. Everything is back to normal. Since I was freaking out I think I began to notice the minimal slapping sound that exists. Just asking the question as I am uneducated. This is my first built motor and although I am mechanically inclined I am absolutely not knowledgeable on the subject. EDIT: the car has boost. I am instructed to keep boost to a minimum. But I have a base map break in tune but nothing crazy specific for my motor/build. I was told: no boost, 500 mile break in, tune for power. But I have hesitation/stumble issues and I need to swap out for my OEM BPV |
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02-04-2013, 02:51 PM | #14 | |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Quote:
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02-04-2013, 02:52 PM | #15 |
Scooby Newbie
Member#: 336241
Join Date: Oct 2012
Chapter/Region:
MWSOC
Location: Colorado, New Mexico
Vehicle:08 Sti OPB |
Hey kappa your in box is full just a FYI.
I'm at 10k miles on my built motor now, on break in it saw a lot of engine braking and boost, I got the motor back from my builder and he had put on 200+miles he is of the thought run her hard and check the oil. Which I pretty much did as well and followed his oil change schedule he wanted me to do. |
02-04-2013, 03:11 PM | #16 | |
Scooby Guru
Member#: 51961
Join Date: Jan 2004
Chapter/Region:
RMIC
Location: Broomfield, CO
Vehicle:2005 STi 2012 WRX |
Quote:
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02-04-2013, 03:21 PM | #17 | |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Quote:
When I noticed the issue; I was at 27psi oil pressure under throttle and 15-18psi at idle. It had more than a quart left but when I stopped the rest leaked out. When I fixed the leak point I filled +/- 4 quarts to be at full. I hold oil no problem. No mechanical issues. Just noise. Its barely noticeable. My OEM engine temp didn't rise very much but my ghetto ass EGT was running higher than normal. I caught it early. I don't foresee a long term problem but I'm just uncertain still. |
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02-04-2013, 03:46 PM | #18 |
Scooby Specialist
Member#: 279525
Join Date: Apr 2011
Chapter/Region:
Tri-State
Location: QUEENS NY
Vehicle:06 Fxt |
I hope the experts chime in, but i believe 4-8 min of running low on oil is more than enough time to mess something up..
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02-04-2013, 03:47 PM | #19 |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
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02-04-2013, 05:06 PM | #20 |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Just an update.
I guess there is a difference between warm and warmed up. Typically I would warm the car for 20 minutes before I drive anywhere. It would make the noise in the video I posted. Now I get home from work (12-15 minute drive) doing quite a bit more engine braking and going up to 4k RPMs than I normally do. Get out the car and pop the hood... Nothing... no sound. I must be high :/ |
02-05-2013, 04:49 AM | #21 |
Scooby Newbie
Member#: 324429
Join Date: Jun 2012
Chapter/Region:
SWIC
Location: Gilbert, AZ
Vehicle:2004 WRX STi Aspen White |
I have the same noise man; built motor: cosworth pistons, eagle rods, dada dada da; and from what I've heard its super normal (forged are loud, especially the cosworth pistons) just check your oil occasionally.
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02-05-2013, 09:11 AM | #22 |
Scooby Specialist
Member#: 335826
Join Date: Oct 2012
Chapter/Region:
MWSOC
Location: Illinois
Vehicle:2002 WRX Silver |
I am on break in right now myself. My builder told me what to expect with the extra noise, the initial puff of smoke at start up, and the extra time to warm up the motor. Being in a cold weather climate, I invested in a little block heater and it helps. I dont drive it in the snow / salt but if its cold ill take it for a spin.
Apparently, I lucked out because my build is not noisy at all. I am by no means an expert but from what I have read from your posts it doesnt sound like you did any damage. What oil were you using for break in? |
02-05-2013, 10:11 AM | #23 | |
Scooby Newbie
Member#: 203327
Join Date: Feb 2009
Location: Mount Holly, NJ
Vehicle:2002 WRX Silver |
Quote:
The tow set me back almost 400 bucks just for them to tell me its fine better safe than sorry I guess. Glad to hear positive feedback and similarities with y'all. I guess since it is cold out it takes a little longer to warm up. No leaks anymore which is good. Just got to plan out how to fix the stumble issue and then its off to tune. Any other input, experience, dos or do nots? |
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02-05-2013, 10:29 AM | #24 |
Scooby Guru
Member#: 81102
Join Date: Feb 2005
Chapter/Region:
South East
Location: Micro aggression turnt
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I would get it tuned for full boost and see if your bearing is toast or not. Sounds like u are fine, get tuned!
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02-05-2013, 03:36 PM | #25 | |
Scooby Specialist
Member#: 316296
Join Date: Apr 2012
Location: Metro Detroit
Vehicle:2006 STIROID 10.5@131 on 29psi |
Quote:
It's hard to tell in the video because of the high idle, but it doesn't sound that bad... If it were a bearing it would be hammering alot more. This is what my .0035" clearanced JEs sound like after idling for ~5 minutes on a 80* day, idling around 1,050 rpm. After a couple 30 psi pulls, she's almost silent! https://www.youtube.com/watch?v=zTvu3X2vw7s Last edited by ckyguy68; 02-05-2013 at 08:45 PM. |
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