i was sitting at goodyear from 2:30 to 7:15 today to get it aligned and they didn't do it, i yelled at them about how much time i've wasted there (5 hours) i spun out of the lot, came to a light had 10lbs of oil pressure, then it started knocking.
2 months of hard work gone.
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07:59 PM
PFF
System Bot
chevypro101 Member
Posts: 64 From: Baltimore MD 21222 Registered: Nov 2007
at the risk of sounding like a noob (which i know it will), what exactly happened? Im still learning bout cars so i dont understand exactly what your talking about? What is the knocking and why does that mean its toast.
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09:21 PM
darkhorizon Member
Posts: 12272 From: Flint Michigan Registered: Jan 2006
knock is actual slop in the bearings. when the rods goes up in the stroke it moves the slop in the bearing and then when it fires it goes back down it moves the slop again. that is knock. that's about easiest way i can explain it.
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10:22 PM
darkhorizon Member
Posts: 12272 From: Flint Michigan Registered: Jan 2006
Well, thats not the knocking I was talking about, I am talking about spark pre detonation, which is when the air/fuel mix explodes when the piston is coming up in the compression stroke before it hits top dead center, and starts coming back down. This basicly "attempts to spin the motor backwards" in a sense, and overloads basicly everything.
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10:34 PM
CTFieroGT87 Member
Posts: 2520 From: Royal Oak, MI Registered: Oct 2002
Pre-ignition is autoignition while the piston is coming up in the bore and before the spark triggers. This blows a hole in the piston and the engine is done instantly.
Knock is autoignition of a portion of the charge after the spark has triggered and the flame front is progressing across the chamber. This is detonation (also called spark knock), the noise you hear is the two pressure waves hitting each other and reverberating through the block. This doesn't destroy the engine right away, but eventually it does hammer the rod and main bearings to the point where the oil film thickness is decreased and there is bearing trouble.
That knock you're hearing is what Billyboy said.
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10:48 PM
PURPLE REIGN Member
Posts: 4080 From: Minnesnowta ------------------ Land of White Gold Registered: Sep 2002
You could probably find some graphic illustration on the internet. But a "Rod Knock" referrs to the Connecting Rod that spins around the crankshaft journal. Two halves bolted together around the crank with a "half bearing" in each part of the rod. When bolted together they form a perfect circle around the crank with very tight clearance and just pressurized oil to lubricate the bearing & rod as it spins. If the engine is overreved it will "spin a bearing" with means too much pressure was applied to the bearing and ot shifted it's position in the rod & cap creating a flat spot or a not so perfect circle. Now when the rod goes up & down as the crankshaft spins, the rod actually slaps or knock as it hits the crank journal, creating the repetitious & deadly knock we all know of. Everything now has to come out and be remachined to factory tolerances to retain oil pressure & silence the knock.
The illustration below shows the real "basics" of a 4 stroke cylinder process. The crank that spins is "green" and the rod connected to it is red. Now just imagine the tight tolerances in there with a tiny little 3mm bearing between the rod & crank journal.
Same motor......................better blower.................only difference is Drive By Wire throttle body, which can be swapped with a Series 2 T.B.
[This message has been edited by PURPLE REIGN (edited 12-05-2007).]
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11:02 PM
kawana Member
Posts: 2329 From: Abbotsford, BC, Canada Registered: May 2007
You could probably find some graphic illustration on the internet. But a "Rod Knock" referrs to the Connecting Rod that spins around the crankshaft journal. Two halves bolted together around the crank with a "half bearing" in each part of the rod. When bolted together they form a perfect circle around the crank with very tight clearance and just pressurized oil to lubricate the bearing & rod as it spins. If the engine is overreved it will "spin a bearing" with means too much pressure was applied to the bearing and ot shifted it's position in the rod & cap creating a flat spot or a not so perfect circle. Now when the rod goes up & down as the crankshaft spins, the rod actually slaps or knock as it hits the crank journal, creating the repetitious & deadly knock we all know of. Everything now has to come out and be remachined to factory tolerances to retain oil pressure & silence the knock.
The illustration below shows the real "basics" of a 4 stroke cylinder process. The crank that spins is "green" and the rod connected to it is red. Now just imagine the tight tolerances in there with a tiny little 3mm bearing between the rod & crank journal.
ha ha, points igntition. i think they quit using that before i was born. that's some old stuff! i think i'm going to find a l32 and maybe get it running for sunday. who know's. i know i hate life right now!
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11:57 PM
Dec 6th, 2007
midnightcarving Member
Posts: 70 From: Schroon Lake, NY Registered: Nov 2007
points ignition is not as uncommon as you think, though the automotive industry abandoned it long ago, there were mercury marine GM 3.0 liters that had points well into the 1990's.
points were also used in small two stroke outboards until the 90's, it was the simplest way to run a 1 or 2 cylinder engine.. all they needed was a lobe on the top of the crankshaft to operate the points under the flywheel...
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01:41 AM
merlot566jka Member
Posts: 675 From: Norman, Oklahoma Registered: Jun 2007
i would think marine stuff would be the worst thing to use points on. motorcycles bailed on them in the late 70's, there were a few left in the early 80s. i don't think i've ever seen a points setup in a car to tell the truth. i haven't ever looked for one either.
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09:04 AM
jb1 Member
Posts: 2141 From: Tullahoma, Tennessee Registered: May 2003
they kept telling me they were going to get it on the rack in a few minutes. i kept getting suckered is what it boiled down to. i'm going to write a nice emial of hate to corporate.
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04:51 PM
Dec 8th, 2007
toadson Member
Posts: 403 From: Jerseyville, IL Registered: Jul 2006
I got my L32 today!!! just under 5k on the clock :P so happy. comes with a 1 year warrenty. almost want to keep my stock parts, but don't want to screw them over. motor looks brand new.