What type of engine mounts do you have?My vibration problems definitely aren't restricted to idle! from 1,000 to 2,000 rpms I have very intense vibrations almost live a really bad driveline [but driveline isn't the problem]. As soon as I slip in the clutch at any speed it goes away instantly, so it's in the engine.
That it goes away when you slip the clutch makes me wonder if it's not the clutch itself, or in that same general area. Things that pop to mind:My vibration problems definitely aren't restricted to idle! from 1,000 to 2,000 rpms I have very intense vibrations almost live a really bad driveline [but driveline isn't the problem]. As soon as I slip in the clutch at any speed it goes away instantly, so it's in the engine.
I'd always wondered about using air bags to support the engine and then shocks / other devices to limit torque movement. Would be complicated, expensive, and probably a pain to get it right.A mess of 4 banger gassers come from the factory with a shock attached to the motor. It is a vibration / harmonics dampener .
Why not use 2 on the 4bt ?
Ahh... Can't remember if you've said this, but have you checked / adjusted the valves? I keep remembering something about some folks with bad vibration getting some relief by adjusting the valves. But I think it was for idle vibration issues.Bad choice of words on my part again: I should have said 'let' in the clutch, not 'slip' in the clutch! Clutch is perfect and so's the whole driveline.
Yeah.. Coming up with a "just in case" for that scenario might be real entertainment. Of course, there's a LOT of cars out there with no real "oopsie" provision built in, other than having two mounts that can counteract torque.I'm sure the airbags would work but you could have a real Grade A nightmare if one ever blew out! Not a pretty sight I'm sure.
Or..I just thought about that and envisioned a cantilever arrangement, somewhat like the vintage shocks. Like a guy has an arrangement with a lever and fulcrum, and the air bag mounted at 'lift' point to support engine, pivot point in center, and at the farthest other end a coil spring. Leave some slack on coil spring, and have a support plate under the air bags as per normal install. If air bag fails engine only drops a couple of inches until coil spring limits movement by stopping lever movement?
Those are torque-control devices in most applications and don't bear the weight of the engine. If you used soft / hydraulic / pneumatic weight-bearing mounts in combination with a dog-bone / hydraulic shock / other device to control torque movement while maintaining a high degree of vibration isolation, yeah, it'd help..I have noticed most front wheel drive cars have engine mounts to the top of the engine. There are many different styles one kind is like a "dog bone". I wonder if using something like this would help vibrations