[C1] Help Diagnosing Engine Vibration - 1960
05-30-2017, 12:49 AM
#21
Team Owner
05-30-2017, 12:52 AM
#22
Team Owner
The first thing I would do is hook up some test equipment like vacuum gage, timing light and dwell meter and see what the results are. It can help you to rule out a high speed engine miss (electrical issue) vs a true mechanical problem. With the timing light hooked up, observe the timing marks and see if possibly the balancer may have separated and the outer ring is moving . I am not leaning towards a mechanical problem based on the lack of noise and the fact that this engine has some miles on it. 
Pilot Dan
Pilot Dan
05-30-2017, 12:55 AM
#23
Team Owner
Thomas, I'm scratching my head, but here are some thoughts. Did the owner have oilite bushing installed or a bearing type? What about all the C-1 specific engine mounting. How about the collar that connects the oil pump to the intermediate shaft? What about the timing chain cam sprocket? 
Dennis
DennisLast edited by TCracingCA; 05-30-2017 at 01:04 AM.
05-30-2017, 12:58 AM
#24
Team Owner
05-30-2017, 12:58 AM
#25
Team Owner
05-30-2017, 01:03 AM
#26
Team Owner
Flywheel, maybe! I assume internally balanced engine! Should get a lot worse with RPM!
Last edited by TCracingCA; 05-30-2017 at 01:09 AM.
05-30-2017, 01:08 AM
#27
Team Owner
Ok give me a shot at this I fixed a fellows 67 corvette that had a vibration like you have for 27 years .He took his corvette to many specials thru the years to no avail.
I bet him a 30 pack of beer if what I said was the problem he would gladly buy the 30 pack .
The next show he got my 30 pack .
He had a vibration after 55 mph I told him smoothing is touching on exhaust. When doing his body off years ago . The Exhaust bracket was for 2 inch instead 2.5 it touched the frame after a certain speed and caused the vibration.
The reason I know this my 63 exhaust was touching just barely I took a ball peen hammer and put a dent in the pipe the size of a dime till it wasn't touching .
When it touched it when thru the whole car you could fell it was ugly.
Hard to find but at different speeds and RMP and conditions it could be your problem sure could use another 30 pack . One was touching on frame the other time touching the under body on fiberglass. Exhaust cant touch anywhere at all .
I am not a good Mechanic but put 3 midyears together and road tested them till all the bugs were gone.
I bet him a 30 pack of beer if what I said was the problem he would gladly buy the 30 pack .
The next show he got my 30 pack .
He had a vibration after 55 mph I told him smoothing is touching on exhaust. When doing his body off years ago . The Exhaust bracket was for 2 inch instead 2.5 it touched the frame after a certain speed and caused the vibration.
The reason I know this my 63 exhaust was touching just barely I took a ball peen hammer and put a dent in the pipe the size of a dime till it wasn't touching .
When it touched it when thru the whole car you could fell it was ugly.
Hard to find but at different speeds and RMP and conditions it could be your problem sure could use another 30 pack . One was touching on frame the other time touching the under body on fiberglass. Exhaust cant touch anywhere at all .
I am not a good Mechanic but put 3 midyears together and road tested them till all the bugs were gone.
Last edited by TCracingCA; 05-30-2017 at 01:37 AM.
05-30-2017, 01:12 AM
#28
Team Owner
Any metal in the oil filter when you cut it apart?
05-30-2017, 08:02 AM
#29
Racer
Does the car have the stock ignition shielding? I developed a miss/vibration in my 60. I found the coil was arcing against the distributor cover. I removed the cover and the miss/vibration went away. I used spray glue and old inner tube to insulate the cover and no more problem
05-30-2017, 10:52 AM
#30
Team Owner
Does the car have the stock ignition shielding? I developed a miss/vibration in my 60. I found the coil was arcing against the distributor cover. I removed the cover and the miss/vibration went away. I used spray glue and old inner tube to insulate the cover and no more problem
Last edited by TCracingCA; 05-30-2017 at 10:55 AM.
06-02-2017, 04:59 AM
#31
Check the wire from coil to dist base inside and under cap .
06-02-2017, 09:42 PM
#32
06-03-2017, 06:09 AM
#33
OK got another idea go to garage in total darkness start the engine
look inside for arching or sparks off of wires .
look inside for arching or sparks off of wires .
06-03-2017, 12:39 PM
#34
Safety Car
Member Since: Jan 2006
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OP Thomas: Not sure if these items have been covered because of multiple cars discussed.
First, vibration damper, second depress clutch change anything?
If not those not much left but internal engine. Before I tore into it, I had a unusual problem with C1. Had worn fuel pump pushrod, like 1/2" short. My issue was different but thinking short rod could cause disturbance in pump.
That said, I would use a stethoscope with vibration happening and hunt.
First, vibration damper, second depress clutch change anything?
If not those not much left but internal engine. Before I tore into it, I had a unusual problem with C1. Had worn fuel pump pushrod, like 1/2" short. My issue was different but thinking short rod could cause disturbance in pump.
That said, I would use a stethoscope with vibration happening and hunt.
06-03-2017, 01:06 PM
#35
Tether Man
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Post #12
My issues in the past with a mid RPM Vibration were Pilot Bearing related.
Best,
My issues in the past with a mid RPM Vibration were Pilot Bearing related.
Best,
06-04-2017, 12:45 AM
#36
Burning Brakes
Thread Starter
dcamick- he has already replaced the pilot bearing/bushing with no change at all.
hope2- that's an interesting original thought. We'll keep in mind when we start to track down the problem.
TCracingCA- lots of good ideas from you. We'll chart your ideas plus many of the other ideas presented here and start down the list with the easiest and most likely problem first and just keep at it till we find the problem.
I promise to keep our progress posted here with our findings. I'm not sure when we'll be able to start work on the car. I forgot I've got vintage racing at Indy all this coming week (Open Wheel World Challenge | SVRA). I'm crewing on 3 Formula Fords.
And then the week following that, still at Indy, is the Brickyard Vintage Racing Invitational. We're crewing on a Lotus 19, a Lola T70 and a McKee Mk10 Wedge, all vintage CanAm cars.
So please bear with me. I've gotten some great suggestions and I will follow up. Watch this space. Thank you everyone.
Thomas
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rtruman (06-04-2017)
06-04-2017, 07:56 PM
#37
Tether Man
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rtruman- I have done that very thing before and it certainly works if there is a bad plug wire and/or arcing anywhere. Thanks for the reminder.
dcamick- he has already replaced the pilot bearing/bushing with no change at all.
hope2- that's an interesting original thought. We'll keep in mind when we start to track down the problem.
TCracingCA- lots of good ideas from you. We'll chart your ideas plus many of the other ideas presented here and start down the list with the easiest and most likely problem first and just keep at it till we find the problem.
I promise to keep our progress posted here with our findings. I'm not sure when we'll be able to start work on the car. I forgot I've got vintage racing at Indy all this coming week (Open Wheel World Challenge | SVRA). I'm crewing on 3 Formula Fords.
And then the week following that, still at Indy, is the Brickyard Vintage Racing Invitational. We're crewing on a Lotus 19, a Lola T70 and a McKee Mk10 Wedge, all vintage CanAm cars.
So please bear with me. I've gotten some great suggestions and I will follow up. Watch this space. Thank you everyone.
Thomas
dcamick- he has already replaced the pilot bearing/bushing with no change at all.
hope2- that's an interesting original thought. We'll keep in mind when we start to track down the problem.
TCracingCA- lots of good ideas from you. We'll chart your ideas plus many of the other ideas presented here and start down the list with the easiest and most likely problem first and just keep at it till we find the problem.
I promise to keep our progress posted here with our findings. I'm not sure when we'll be able to start work on the car. I forgot I've got vintage racing at Indy all this coming week (Open Wheel World Challenge | SVRA). I'm crewing on 3 Formula Fords.
And then the week following that, still at Indy, is the Brickyard Vintage Racing Invitational. We're crewing on a Lotus 19, a Lola T70 and a McKee Mk10 Wedge, all vintage CanAm cars.
So please bear with me. I've gotten some great suggestions and I will follow up. Watch this space. Thank you everyone.
Thomas
Just a Note:
I replaced 2(two) pilot bearings on my 1968 427 3 deuces to solve the problem....
Over and Out!
Last edited by dcamick; 06-04-2017 at 08:00 PM.
