by PhreakdOut » Tue Jul 31, 2007 10:10 am
Going without a dog bone mount will allow the engine to torque roll excessively. To give yourself an example, disconnect one end and have someone put the car in gear with the brakes on. Slowly increase the throttle and watch the engine roll. You will see how much the engine moves at take off.
Going without the mount gains you nothing. In fact, you lose some torque in engine roll because the torque is not transferred into the driveline. Drag racers of RWD cars would use solid engine mounts to eliminate torque loss in engine roll.
Some FWD racers use a solid mount (adjustable like a tie rod) or change to polyeurathane (sp) bushings which have less flex. The downside is that it is harder on the remaining engine / trans mounts and NVH is affected. (More engine vibrations transferred to the chassis.)
If you are doing an engine swap, I would look at the new engine's dog bone mount and have someone fabricate a mounting point on your chassis and an adjustable dogbone to match.
Just my 2 yen.
EDIT: My bad SC, I didn't see you were the author. You know all this basic stuff already. If you mean just a temporary thing driving w/o the bone, it's no problem. Just take it easy when pulling away from a stop. Most movement occurs at that moment.
-- The Phreak
'04 350Z 6spd Touring Roadster w/Nav | Megan Racing | Greddy | Nissan Motorsports | Whiteline | Wicked Tuning | Giovanna | Injen | Polished Intake & Throttle Body | Eibach | Central 20 | Stillen | Misc CF Items
