couple examples....
Thread: What caused my melted piston?
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10-27-2009 04:29 PM28 F1 Pantera - Sit down and foot throttle | DPM Drive
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10-27-2009 05:10 PMwell I'm leaning away from lean per my previous posts,,,, so I'd be looking at timing, octane of your fuel, heat range of plugs, crossfire, cooling, etc. etc.
Might be a good idea to have your fuel tested... The guy at the gas station may have been hung over and hit the 89 button instead of 93.
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10-27-2009 05:13 PM...and we're back to why just one cylinder.
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10-27-2009 05:15 PMI filled it on a land gas station, and pushed the 93 button myself, so the fuel should be ok.
All this happened in the beginning of summer so I have refueled a few times since then...
Heat range of plugs brings it back to my original question about the loose plug. Is there any descent way to find out if it crossfires? Besides looking at the wires at night...Last edited by Tomas Wallin; 10-27-2009 at 05:29 PM.
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10-27-2009 05:25 PMI look at the wires very closely and see if you can see any white chalky marks. To be honest, I dont' think you're ever going to know exactly why it was only one piston....
Last time I detonated an engine I forgot to turn on a fuel pump and it toasted #7 bad and started getting #5 on one engine. On the other engine is blew the head gasket on #5.
A long time ago I detonated an engine and it only took out #7 and every other cylinder was good. So go figure!
Another boat I worked on (45 Sonic with HP500's) leaned out and detonated due to the chinsy fuel/water pump setup the late models had. The spark plug sorta welded itself into the GM style cylinder head.. I had to heat the head to loosen the plug.
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10-28-2009 05:29 PMI hear ya! What were your brake specific and A/F numbers?
Another example of lean-out....these pictures were from not turning on the fuel pumps....
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Offshore Racing wasnīt designed to be a spectator sport, it's for people or companies with's lots of money to push the envelope of endurance technology and hopefully put a trophy on a mantle. It's man vs the elements, not like boats with like engines running in circles.
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10-28-2009 10:32 PMDid you ever do plug checks when tuning? If the plug in that hole was loose the question becomes did the detonation cause the plug to loosen or was it never really tight? That plug may have just become a glow plug from being loose and caused severe preignition. I feel your heat range is good with the 41's. What condition are the plug wires in?
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10-29-2009 05:05 AMBut why did the other cylinders look perfect? Of course it has to start somewhere but still... The fuel tank was dry when I filled it up for this little trip - on a land gas station so the fuel should be in good condition.
The dyno guy and his helper checked the plugs during the dyno so I can't guarantee anything...
My plug wires had 20 hours on them. http://www.keitheickert.com/detail.aspx?ID=792728 F1 Pantera - Sit down and foot throttle | DPM Drive
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10-29-2009 05:44 AM
Tomas it doesnīt take much time to melt a piston. And the #4 IMO was already going too.. so if youīd stayed on it a little more there wouldīve been two.
Iīm still saying itīs cooling related. Either the Intercooler or head.
You Should switch to E85 or E95 as your engine seems to like to run like a Diesel
Or then the Dyno guy just tuned your engine too lean.
Regarding the loose plug issue...heat and detonation does it.
* No Voodoo Here...Offshore Racing wasnīt designed to be a spectator sport, it's for people or companies with's lots of money to push the envelope of endurance technology and hopefully put a trophy on a mantle. It's man vs the elements, not like boats with like engines running in circles.
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10-29-2009 05:47 AMOffshore Racing wasnīt designed to be a spectator sport, it's for people or companies with's lots of money to push the envelope of endurance technology and hopefully put a trophy on a mantle. It's man vs the elements, not like boats with like engines running in circles.