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04-29-2012, 03:30 PM
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#1 |
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Scooby Newbie
Member#: 314284
Join Date: Mar 2012
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Fresh Hybrid knocking/ticking diesel sounding! =Video=
http://www.youtube.com/watch?v=rmy7C...ature=youtu.be
Just had a local shop finish a hybrid build for me. Supposedly theyve done several hybrids. Wiseco Pistons on new STI block Stock rods Sti head gasket Stock cams / valvetrain on 2.0 heads New belts, oil pump, water pump Noise is driving me nuts - no metal flakes in the oil, no oil consumption or smoke. Only driven about 50 miles. Has gotten slightly quieter but still sounds like a diesel! Last edited by Jet130; 04-29-2012 at 03:37 PM. |
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04-29-2012, 03:32 PM
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#2 |
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Scooby Newbie
Member#: 314284
Join Date: Mar 2012
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Besides a no name uppipe - all stock and no tune.
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04-29-2012, 03:36 PM
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#3 |
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Scooby Newbie
Member#: 314284
Join Date: Mar 2012
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04-29-2012, 03:38 PM
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#4 |
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Scooby Newbie
Member#: 314284
Join Date: Mar 2012
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Bump!
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04-29-2012, 04:00 PM
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#5 |
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Scooby Specialist
Member#: 43151
Join Date: Sep 2003
Chapter/Region:
South East
Location: Charlotte, NC
Vehicle:04 STI Kinda Silver-ish |
Sounds like a mean case of piston slap. What forge were the pistons, and what was the ptw clearance?
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04-29-2012, 05:10 PM
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#6 | |
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Scooby Newbie
Member#: 314284
Join Date: Mar 2012
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Quote:
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04-29-2012, 04:02 PM
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#7 |
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Scooby Guru
Member#: 166324
Join Date: Dec 2007
Chapter/Region:
NESIC
Location: Haverhill, MA
Vehicle:02 V8 Spec C 03 V9 Limited 2013 Legacy |
Does it go away after warming up?
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04-29-2012, 05:10 PM
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#8 | |
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Scooby Newbie
Member#: 314284
Join Date: Mar 2012
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Quote:
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04-29-2012, 05:24 PM
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#9 |
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Scooby Specialist
Member#: 43151
Join Date: Sep 2003
Chapter/Region:
South East
Location: Charlotte, NC
Vehicle:04 STI Kinda Silver-ish |
I have a hybrid build that sounds very similar; not quite as bad, but almost. Piston slap. It doesn't get quiet until the coolant temp gets above 205. I had to put in a higher range thermostat just to get it to shut up
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04-29-2012, 06:11 PM
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#10 |
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Scooby Specialist
Member#: 123625
Join Date: Aug 2006
Chapter/Region:
MWSOC
Location: Waukesha, WI
Vehicle:2002 wrx vf34 Tuned at Cobb |
Before you go jumping to conclusions check for pre turbo exhaust leaks. They sound similar to what i'm hearing in the video.
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04-29-2012, 06:17 PM
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#11 |
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Scooby Newbie
Member#: 314284
Join Date: Mar 2012
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Although there maybe a leak - the dominant sound is coming from the center of the block. Sounds like someone knocking on a metal door if you put you ear up to a screwdriver. The sound get slightly quieter after warm-up, but not much.
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04-29-2012, 08:28 PM
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#12 |
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Scooby Specialist
Member#: 136671
Join Date: Jan 2007
Chapter/Region:
MWSOC
Location: Bartlett,Il
Vehicle:WRX HTA GT3076R 9cm2 eWG'd It's ALIVE!! |
loud piston slap, were the skirts on the pistons coated?
Whats the PTW? They should have given you a build sheet with bearing clearances, Piston specs, ring end gaps, PTW at the least. |
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04-29-2012, 08:25 PM
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#13 |
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Scooby Specialist
Member#: 200767
Join Date: Jan 2009
Chapter/Region:
NESIC
Location: Auburndale
Vehicle:2003 WRX 2.5 Hybrid 97 Impreza pimp wagon |
I'd check your builder to see what your PTW clearances are. I vote piston slap...
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04-29-2012, 08:33 PM
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#14 |
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Scooby Specialist
Member#: 121532
Join Date: Jul 2006
Chapter/Region:
SCIC
Vehicle:2006 FXT/STi 6MT 01 Aerosim GC8 Coupe |
If your wiesco pistons have offset pins, they could have been put in backwards.
That would cause what would have been a slight (normal) slap to become magnified and will certainly cause premature skirt wear and the noise will never go away until the pistons are installed correctly. What does the builder say about the noise? |
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04-29-2012, 09:08 PM
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#15 |
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Scooby Specialist
Member#: 102857
Join Date: Dec 2005
Chapter/Region:
BAIC
Location: Fresno Ca
Vehicle:RHD sedan sti swap high on meth |
Man that is loud. Sure you don't have any big exhaust leaks?? That is not normal piston slap
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04-29-2012, 11:43 PM
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#16 | |
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Scooby Specialist
Member#: 123625
Join Date: Aug 2006
Chapter/Region:
MWSOC
Location: Waukesha, WI
Vehicle:2002 wrx vf34 Tuned at Cobb |
Quote:
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04-30-2012, 12:23 AM
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#17 |
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Scooby Specialist
Member#: 131280
Join Date: Nov 2006
Chapter/Region:
BAIC
Location: Northern California Hayward
Vehicle:2004 Impreza WRX WRB |
Check for leaks first. If it ain't leaks, be really worried!
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04-30-2012, 03:19 AM
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#18 |
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Scooby Newbie
Member#: 295432
Join Date: Sep 2011
Chapter/Region:
SWIC
Location: Arizona
Vehicle:2003 WRX MBP |
valve lash? (clearance)
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04-30-2012, 09:12 AM
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#19 |
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Scooby Specialist
Member#: 271720
Join Date: Jan 2011
Chapter/Region:
Tri-State
Location: NEPA
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I have some pretty loud slap in my car, but your sounds like something more is going on.
Like others said, check for exhaust leaks first, but if it were me, Id be having a bit of a converstaion with that shop. |
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04-30-2012, 11:12 AM
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#20 |
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Citizen Mick
Member#: 27646
Join Date: Oct 2002
Chapter/Region:
NWIC
Location: Portland, Oregon
Vehicle:2003 Sleeved 2.5 Oil Dry Sump Goodness |
Piston slap. From the way that you worded it I am thinking that the shop did drop in pistons for you. This is where they just remove the stock pistons and drop in forged ones. Sometimes you can get away with that if it's measured and matched at least a bit, sometimes not... like in your case.
As TS said, the wiesco pistons have offset pins, they could have been put in backwards. |
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04-30-2012, 11:19 AM
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#21 |
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Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region:
NWIC
Location: portland
Vehicle:1990 Legacy wagon goes 12.387 @ 116.5 |
Old or new timing belt tensioner? and old or new style?
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04-30-2012, 11:20 AM
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#22 |
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Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region:
NWIC
Location: portland
Vehicle:1990 Legacy wagon goes 12.387 @ 116.5 |
Old or new timing belt tensioner? and old or new style?
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04-30-2012, 11:22 AM
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#23 |
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Scooby Guru
Member#: 64673
Join Date: Jun 2004
Chapter/Region:
NWIC
Location: portland
Vehicle:1990 Legacy wagon goes 12.387 @ 116.5 |
The thud sure sounds like the tensioner.
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04-30-2012, 11:34 AM
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#24 |
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Scooby Specialist
Member#: 155696
Join Date: Aug 2007
Chapter/Region:
Tri-State
Location: New Jersey
Vehicle:2007 BLK STI Dom3XTR 415/405 Precision Tuning |
My #1 vote would be piston slap for sure and really bad case of it. Does your car reach target boost if u get on it? If not you may have a bad up-pipe leak. The weld snapped on my up-pipe and it sounded just like that but it would obvious. It was blowing air like a hair dryer out of the gap.lol
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04-30-2012, 12:21 PM
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#25 | |
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Citizen Mick
Member#: 27646
Join Date: Oct 2002
Chapter/Region:
NWIC
Location: Portland, Oregon
Vehicle:2003 Sleeved 2.5 Oil Dry Sump Goodness |
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