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Old 10-13-2010, 09:09 PM
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mounting motor with jag ifs swap

I'm installing a 86 Jag ifs in a F-1 Ford truck. I've finished the rear mounts and am working on the front mounts and I got to wondering. The Jag engine was mounted on the IFS, so really the weight of the engine was not on the rubber mounts. All the swaps I've seen, had the engine mounted to the frame. Wouldn't mounting the engine to the frame put extra weight on the rubber mounts of the suspension. Wouldn't it change the way it was designed to handle. What would be wrong with mounting the engine the same way it was in the Jag?????????????/


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Old 10-13-2010, 09:35 PM
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jag mounting

The jag suspension was mounted, (front and rear) on rubber to give a smooth easy ride, Jag racers usually stiffened it up. or added extra tie links to keep suspension from moving around, It depends on what you want. How you will be driving it.
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Old 10-14-2010, 09:56 PM
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mounting motor with jag ifs swap

I'm not really concerned about the ride, I'm a little concerned about the stresses being different on the rubber v mounts and forward donut mounts. On the Jag, the engine weight is directly on the subframe. With the motor being mounted to the frame, on my truck, the engine weight will be more on the v mounts and donuts than it would have been on the Jag, because there was no engine weight on the v mounts and donuts. They still have to deal with the weight in one way or another. It just seems like it would be stresses that it might not have been designed for...........Bill
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Old 10-15-2010, 09:16 AM
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If the sub frame that carries the suspension is mounted to the frame with rubber then yes there is more weight on the rubber if the engine is mounted to the frame rails instead of the subframe. The weight and load is the same on the rubber components, if any, that are in the suspension like a arm bushings and stuff regardless of the engine mounting. The rubber subframe mount bushing would probably handle it ok but the better thing to do would be to eliminate them. Everything would then work and handle better with the only trade off being a very slight difference in noise and vibration that you probably can't even tell. Chances are your engine will have less harmonics than the original jag engine did and you will still be better after eliminating the rubber.
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