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#61
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I've seen that happen too. Pump shaft busted out of its block hole. It looked like a pretzel caught up in crank and locked the engine down.
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#62
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Curious, do the "clean" pistons correspond to the plugs that had no gap?
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65 Tempest, 400, TH400 86 Fiero SE 2.8 |
#63
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MarkS57 - That's a good question, I don't have the answer. When I pulled the plugs, I didn't think I'd end up where I am with this engine, and didn't consider ordering them. Lesson learned. From my recollection, they were on the passenger side. On a side note, there is zero chance I forgot to gap them. I did them all the first time, and did a double check of the gap at a later date. I can post pics later, but they are all clean. The car only drove a couple miles, had a good AFR, etc...
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1965 Pontiac GTO 455/469 w/ #48 Heads, '65 Tri-Power 9.25:1 CR Stump Puller Cam Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00 3.55 Rear Differential Front: 225/60R15 Height: 25.6" Rear: 275/60R15 Height: 28" |
#64
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Almost like it ingested something soft, enough to close up the gaps but not damage metal ... like piece of hose or something, then melts and seizes a cylinder after cooling on shut down. Plastic would be capable of that, chunk of carb spacer etc.
I like these kinds of mysteries but I hate that someone has to suffer for them. |
#65
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What was the P/W clearance for each cylinder?
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
#66
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I was talking to a spouse. She told me her husband wrote every clearance down on every engine he built. She was going through the notebook after husband's passing. My point, myself included we should write down clearances when we assemble the engine. That way if something happens like this you may a clue what happened.
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#67
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Always write down the build info.
There are many, readily available, downloadable forms for free you can use, just search it. Here's one as an example: https://www.powernationtv.com/assets...data-sheet.pdf .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#68
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AG - Ross specs 0.004" up to 4.49" bore for these "radius corner" pistons. My notes show that I was larger, from 0.0051" to 0.0055" . I was worried about too much clearance, but I had to also account for my measuring skills and eyesight.
The machinist had the pistons in his hands and did a final hone. I was comfortable with the clearance. No slap or weird noises while running. Here is a video from the first start up in my driveway: https://www.dropbox.com/s/lobyla9yj5..._3097.MOV?dl=0
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1965 Pontiac GTO 455/469 w/ #48 Heads, '65 Tri-Power 9.25:1 CR Stump Puller Cam Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00 3.55 Rear Differential Front: 225/60R15 Height: 25.6" Rear: 275/60R15 Height: 28" |
#69
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Blows me away how many machine shops don't provide this type of info when doing work, totally unacceptable.
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#70
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Let me know if you would like me to drop by. I live in Escondido. I can't provide much physical help, but I can provide another set of eyes and thoughts.
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The Following 3 Users Say Thank You to Old Man Taylor For This Useful Post: | ||
#71
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OMT is the best.
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The Following 3 Users Say Thank You to ponjohn For This Useful Post: | ||
#72
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Quote:
Here's another checklist of mine: Engine Build Sheet pdf And one from Lee Atkinson: Assembly Check List
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
The Following User Says Thank You to johnta1 For This Useful Post: | ||
#73
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I remember proof reading that Assembly Checklist for Lee about 20 years ago. If it's missing something, we both missed it.
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The Following User Says Thank You to Old Man Taylor For This Useful Post: | ||
#74
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Update-
I pulled the engine and did a partial disassemble. Old Many Taylor - If I fix this, I'd like your help on initial startup when the time comes. I'm done with disassemble. I will drive this to my machinist Monday, have him complete the tear down and quote for a complete long block. Based on that, reassess where I am financially with this car and what options I have. No smoking gun. Heads and pan off. Valve train is good. No visible apocalypse, but significant metal. Photos - 1 & 2) Metal in oil pan. 3) "Double ring" witness marks on oil pump driveshaft, circled in red. Ignore another area of wear, that was me filing a rough spot in assembly. 4) Cam sprocket keyway chipped. 5) Random metal by oil pump. More photos to follow.
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1965 Pontiac GTO 455/469 w/ #48 Heads, '65 Tri-Power 9.25:1 CR Stump Puller Cam Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00 3.55 Rear Differential Front: 225/60R15 Height: 25.6" Rear: 275/60R15 Height: 28" |
#75
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More photos.
It's hot, and I'm tired. I could do better photos, but I need a break. Note the vertical striations in one bore. I cracked number 8 rod cap loose and I was able to move the piston. Here's what more I have...
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1965 Pontiac GTO 455/469 w/ #48 Heads, '65 Tri-Power 9.25:1 CR Stump Puller Cam Muncie M22W 1st-2.56 2nd-1.75 3rd-1.37 4th-1.00 3.55 Rear Differential Front: 225/60R15 Height: 25.6" Rear: 275/60R15 Height: 28" |
#76
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I asked you some # of posts ago what type of pistons you had; cast, forged, or hyper. You never answered. If they are hyper then the .020 ring gap you mentioned somewhere above is way too tight, and the engine seizing could be the result of the top rings expanding due to heat and stopping piston travel. Most of the time this starts popping the top ring lands off but if it occurred just as you lifted off the throttle could have just seized the engine. In one of those pictures it looks like part of a top ring land has popped off.
I came back. The thing I saw is shadow so nix my comment re a ring land coming off. Is that stuff in the pan aluminum or steel/iron? |
#77
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Does the engine rotate now?
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John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
#78
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Is that deep scuffing on that one piston skirt?
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#79
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Quote:
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#80
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Looks like the cylinder in picture #3 is ingesting coolant. The piston is too clean
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