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You do not have permissi
Join Date: Aug 2001
Location: midwest
Posts: 39,923
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Quote:
There is good heat transfer through the piston. And the lightweight side cut-outs are more prone to making it oval. A design flaw. But why only on one side? Why only two cylinders?
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09-28-2015, 10:16 AM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,081
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Some pistons are made with a oval at the skirts to help with warm up, esp forged ones...
I do not know if this is the case here or not... The heat and cold could exasperate it. To "heat shrink" all it takes is hot on one side and cool on the other . If you have not ever done this you can move a mountain of metal this way. I am going to guess #5 and #6 have the biggest variances to start . I will also guess all the engines will encounter this problem sooner or latter. This is not a good thing.!
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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09-28-2015, 10:45 AM
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You do not have permissi
Join Date: Aug 2001
Location: midwest
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Maybe kill cyl1-4 during(after) extreme cold startup? Or at least for a minute or two?
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09-28-2015, 11:03 AM
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Air Medal or two
Join Date: Jul 2003
Location: cross roads
Posts: 14,081
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We could go on and guess all sorts of things..
But someone some where has to measure and see which one has changed (piston or cylinder
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D troop 3/5 Air Cav,( Bastard CAV) and 162 Assult Helicopter Co- (Vultures) South of Saigon, U Minh Forest, Delta, and all parts in between |
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09-28-2015, 11:43 AM
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Registered
Join Date: Jan 2003
Location: Langley,B.C.
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They have a metallic tapping sound, similar to a lifter, but doesn't go away as the builds pressure, it is there all the time. The sound gets worse as scoring gets worse. It can be pinpointed with a stethoscope. Cheers
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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09-28-2015, 03:17 PM
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Registered User
Join Date: Sep 2014
Location: Sur Califas
Posts: 144
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Ah, similar to rod knock then.
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09-28-2015, 04:12 PM
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Registered
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Location: Langley,B.C.
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Similar, but lighter sounding, more tinny, if that makes sense....
 Dropping the 3.8 at the end of the week, post some findings after that. There is a good thread on Rennlist about scoring on the 996 forum called "blown engine". Discusses IMS issues as well, but a fellow there has done some measuring etc... Cheers
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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09-28-2015, 08:32 PM
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Registered
Join Date: Jan 2004
Location: Docking Bay 94
Posts: 7,025
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What is the typical "ballpark" cost to tear down an M97 and rebuild with new sleeves?
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Kurt |
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09-29-2015, 09:18 AM
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Burn the fire.
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Quote:
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09-29-2015, 11:45 AM
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Location: Langley,B.C.
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Price all depends on what needs/gets done. LN Engineering charges 4770 to sleeve a 3.4-3.8 and supply pistons, pins, clips and rings. So add in rod bolts, gasket kits, bearings, IMSB (if you desire), chains, ramps, tensioners, water pump, valve guides, valves (if required), lifters etc plus labor to re/re engine and rebuild it. Makes most aircooled builds seem reasonable...
ECU will work fine with a mild displacement increase, but of course, better performance would come from a re-flash.
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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09-29-2015, 01:13 PM
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Burn the fire.
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That V8 swap is looking mighty fine right now
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09-29-2015, 03:50 PM
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The V8 swap does not look good if you have ever seen the Boxster one they do....
We service one...
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Turn3 Autosport- Full Service and Race Prep www.turn3autosport.com 997 S 4.0, Cayman S 3.8, Cayenne Turbo, Macan Turbo, 69 911, Mini R53 JCW , RADICAL SR3 |
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09-30-2015, 06:16 PM
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Burn the fire.
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I have seen some good V8 swaps that look very clean and I have seen some shoddy ones that look like hackjobs.
Well, I think my 2006 CS is in the engine failure category. It had a few misfires this morning after warming up and luckily made it to my office very quickly. Just started it up now, slight stumble followed by a loud clacking that increased with RPMs. Sounds just like rod knock. Fudge.
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10-06-2015, 03:58 PM
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Location: Docking Bay 94
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Ughh, hope it's not big ticket...
Keep up posted.
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Kurt |
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10-06-2015, 04:27 PM
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Burn the fire.
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I'll see if I can snag a video later. I really don't want to run the car right now to prevent further damage.
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10-06-2015, 04:36 PM
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Join Date: Sep 2014
Location: Sur Califas
Posts: 144
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Sorry to hear. What kind of conditions has the car been through? Mileage?
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10-06-2015, 04:57 PM
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Burn the fire.
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Hey cheeze, to answer your questions:
Car has been regularly maintained, oil changes at 5500-6000 miles. Aftermarket headers + exhaust. New Air/Oil separator 2 years ago, brakes & tires a year ago. Just did oil change + filters 5 weeks ago. Aside from that, just washed & waxed every month. While I have owned it, never over-revved. Only above 3k RPMs when warm. For now, car is parked at my office. I'll see about towing it home this weekend. So what be my options? • Replacement engines are in the $12,000 - $14,000 range. • Rebuild? No idea what that costs, guessing about $5,000 - $8,000 in parts + labor. • LS7 Swap? $3,500 - $4,000 range, plus smog concerns. Specialists or techs for the M96/M97 series that can chime in?
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10-07-2015, 09:18 AM
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Join Date: Sep 2014
Location: Sur Califas
Posts: 144
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How many miles? Was it driven often?
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10-07-2015, 02:32 PM
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Location: Docking Bay 94
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Quote:
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Kurt |
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10-07-2015, 04:49 PM
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Zink Racer
Join Date: Aug 2005
Location: Spokane WA
Posts: 3,998
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Rennlist seems much more active with the water cooled crowd for tech info.
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Jerry 1964 356, 1983 911 SC/Carrera Franken car, 1974 914 Bumblebee, a couple of other 914's in various states of repair |
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10-08-2015, 05:55 AM
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2017 Victory Octane
2005 Dodge Ram 1500 SLT
