hustler's "driver shame" thread
#1342
Tour de Franzia
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I can't find anything on harmonics mis-shaping the valves.
#1346
or perhaps your non interference engine is not so non interference anymore? Did you do any shaving to the block or head when you built it? Do you know the history of the block? Could it possibly have been rebuilt before and decked/shaved?
I know my motor is not even close to being non interference anymore... unfortunatley.
I know my motor is not even close to being non interference anymore... unfortunatley.
#1348
Tour de Franzia
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or perhaps your non interference engine is not so non interference anymore? Did you do any shaving to the block or head when you built it? Do you know the history of the block? Could it possibly have been rebuilt before and decked/shaved?
I know my motor is not even close to being non interference anymore... unfortunatley.
I know my motor is not even close to being non interference anymore... unfortunatley.
#1349
Cpt. Slow
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My understanding was that non-interference motors means that the piston at it's highest point and the valve at it's lowest point won't touch.
Valves have some leeway for extra travel, so if this space is small, which I'm sure it is, getting rid of that slack (aka: hitting your valve's bump stops) with an over-rev may very well make them connect.
dl;dr: sounds legit.
Valves have some leeway for extra travel, so if this space is small, which I'm sure it is, getting rid of that slack (aka: hitting your valve's bump stops) with an over-rev may very well make them connect.
dl;dr: sounds legit.
#1350
non-interference is what curly said.
#1351
Tour de Franzia
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"Indicative" is a stupid word and requires passive voice verbs. Use "indicates" or I'll ban you.
I don't know what happened, machinist claims the valves most likely hit the piston.
I don't know what happened, machinist claims the valves most likely hit the piston.
#1352
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#1353
So, other than the low compression numbers, the thing ran fine, right? Seemed fine when I rode in it a couple months back.
#1354
Tour de Franzia
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It ran fine but I imagine it will run significantly better now that I should have 40% better leak numbers all the way around. It was hard to start and started oscilating at idle. The car has really transformed over the last two months and I'm proud of it again. No more embarassment from zip ties, wires, and rubber hoses.
#1358
wierd thing is from what you said, there is no evidence of piston/valve contact. nothing that's been claimed as the cause makes any kind of sense. problem with that is the possibility of it happening again. if you don't know what caused the problem, how can you prevent it in the future? that would be keeping me up at night. I "zinged" my motor 5 times without ill effect. my compression has been the same the last 4 years. Am i just super lucky, or we just grasping at straws with jfk theories of bent valves. there were 2 shooters in case you wondered. Good luck either way, need to get that beast back out there.
#1359
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Yeah JZ, that's why I won't let the problem go away. The only real possibilities are piston to valve contact a while ago, and the valves not dinging the pistons, or strange vibration related happenings. I went with the stronger valve springs and SS valves to essentially eliminate variables over over-spinning and a stronger valve to resist vibration, hopefully it will work because it seriously depleted my bank account. I could have picked-up a van and trailer with the money I spent this time around, but I'm really happy about upgrading the things I did. Some of the upgrades fixed things which were hazardous, others will quell embarrassment on the alignment rack.