digithead
Well-known member
- Joined
- Jan 24, 2016
- Messages
- 264
- Reaction score
- 2
- Location
- UPSTATE NY
- My Car
- 1973 Mustang 351C-4V 4BBL 4 SPEED CONVERTIBLE White
Hi all. I have a engine vibration that I cant pinpoint. I did read a lot of posts here but nothing that totally matched mine.
I have a 73 Convertible, 351C V8, with Edelbrock 650CFM carb and Weiand Intake for 4BRL to 2V heads. 4 Speed Manual.
Car starts well, idles well.Never bucks or backfires. Strickly a vibration complaint. You can feel it pronounced in steering wheel, and a bit through pedals and shift. It never goes away. It varies with certain RPMS, but never gone. So I started with basics. I pulled all plugs they all looked good. Since I had each one out I checked compression on each. They were 155/185/175/165/150/165/165/165. I put in all new plugs albeit old ones looked a NICE color. No real change. It has aftermarket Pertronix ignition no points. New coil. New plug wires. Pulled distributor cap and checked it and rotor. Looked nice but cleaned some very minor black. Ran car with distributor slightly loose and varied timing. No change in vibration, idle speed just went up and down of course. Idles smooth . When you drive it, accelerates fine, no hesitation, no pops or farts. Just steady vibration in steering wheel. If I get it going about 30-60 and toss in neutral and let out clutch and just do a high speed cost, wheel feels pretty good. Barely and vibration, car tracks nice and straight. So its not alignment or suspension. The vibration goes directly with engine RPM only. So its been run quite awhile since rebuild and not blown up. I pushed it hard a few times no explosions or parts exiting hood area. Where do I go from here to find source of such steady vibration. Literally like something simply out of balance. TIA!
I have a 73 Convertible, 351C V8, with Edelbrock 650CFM carb and Weiand Intake for 4BRL to 2V heads. 4 Speed Manual.
Car starts well, idles well.Never bucks or backfires. Strickly a vibration complaint. You can feel it pronounced in steering wheel, and a bit through pedals and shift. It never goes away. It varies with certain RPMS, but never gone. So I started with basics. I pulled all plugs they all looked good. Since I had each one out I checked compression on each. They were 155/185/175/165/150/165/165/165. I put in all new plugs albeit old ones looked a NICE color. No real change. It has aftermarket Pertronix ignition no points. New coil. New plug wires. Pulled distributor cap and checked it and rotor. Looked nice but cleaned some very minor black. Ran car with distributor slightly loose and varied timing. No change in vibration, idle speed just went up and down of course. Idles smooth . When you drive it, accelerates fine, no hesitation, no pops or farts. Just steady vibration in steering wheel. If I get it going about 30-60 and toss in neutral and let out clutch and just do a high speed cost, wheel feels pretty good. Barely and vibration, car tracks nice and straight. So its not alignment or suspension. The vibration goes directly with engine RPM only. So its been run quite awhile since rebuild and not blown up. I pushed it hard a few times no explosions or parts exiting hood area. Where do I go from here to find source of such steady vibration. Literally like something simply out of balance. TIA!