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Therealdrevil
Joined: 09 May 2011
Posts: 25
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 Posted: Tue Jun 07, 2011 1:31 pm Post subject: Engine damage, Anyone know why? |
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I have just stripped down this engine to find the cause of compression loss
Top rings are damaged
Pistons have marks also, Parts of the rings stuck in them.
Anyone seen this type of damage before? |
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Power-Tripp
Joined: 26 Nov 2008
Posts: 312
Location: Alabaster, AL, USA
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| Posted: Wed Jun 08, 2011 4:00 am Post subject: |
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What bore diameter and top ring gap?
Do you have photos of the top of the piston, as well as the ring gap, and chambers?
In the first photo, the piston looks scuffed near the top - hard to see in that particular photo. Do you have a better photo of that spot?
Only one cylinder, or several/all?
_________________
"To achieve anything in this game you must be prepared to dabble in the boundary of disaster." -Sterling Moss |
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RootesRacer
Joined: 04 Apr 2005
Posts: 460
Location: Arvada, Colorado
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| Posted: Wed Jun 08, 2011 4:41 am Post subject: |
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| Install new rings with a ring ridge in the top of the bores? |
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Therealdrevil
Joined: 09 May 2011
Posts: 25
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| Posted: Wed Jun 08, 2011 2:01 pm Post subject: |
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| Power-Tripp wrote: | What bore diameter and top ring gap?
Do you have photos of the top of the piston, as well as the ring gap, and chambers?
In the first photo, the piston looks scuffed near the top - hard to see in that particular photo. Do you have a better photo of that spot?
Only one cylinder, or several/all? |
81mm bore
ring gap = standard so not sure
top of the piston is perfect, no damage
Reading further into it I think it is detonation damage, The chrome has come off the piston ring.
"One of the shortcomings of coated steel rings is seen more on the performance side. Richards says if you put a coated ring into a cylinder where there's high pressure and heat for short bursts (such as drag racing) and you detonate the motor, you may flake the moly or chrome off the ring, ruining the cylinder, piston and ring in the process" |
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dkGoodrich dot com
Joined: 18 May 2010
Posts: 159
Location: Frankfort KY
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| Posted: Wed Jun 08, 2011 11:29 pm Post subject: |
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I'd be interested to know what the exact ring end gap is.
Seems like if it was due to pure detonation you would see it on the piston tops.
_________________
http://www.dkGoodrich.com
KY's Fastest Honda's, Acura's & Subaru's
Dyno cell with a 2010 Mustang Load Dyno. |
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Pantera EFI
Joined: 12 Feb 2005
Posts: 1266
Location: So. California
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| Posted: Thu Jun 09, 2011 9:10 am Post subject: Filled Rings = Failed Engine |
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My first experience with "filled rings" was the same as your picture.
I suggest your call Mike at RaceTec Pistons (714-903-4362) he will provide "coated" steel rings that will NOT flake.
RaceTec Pistons is owned by Wayne Brooks, the man who bought Jans Engineering creating (J.E. Pistons)
by retaining the Calvert brothers (C.alvert/ P.inkle Pistons) away from Nick Aris, (Aris Pistons).
You will find a quality operation at a VERY fair cost for needed items.
Lance |
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stevieturbo
Joined: 29 Aug 2006
Posts: 846
Location: Northern Ireland
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Grocerius Maximus
Joined: 02 Apr 2006
Posts: 169
Location: McKinney TX USA
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| Posted: Thu Jun 09, 2011 2:20 pm Post subject: |
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| Moly filled iron top rings will only handle so much power with small amounts of detonation (or none) before falling apart, go to a steel top ring. |
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