Designing my custom motor mounts, need some opinions.

[002-M-P]

I am starting to make choices now on how I plan to build my custom motor mounts for my 350Z and am trying to decide on a material/thickness etc. So far I have just been leaning towards using .25" 1018 mild steel as the material. Using plate to attach to the engine with the 4 bolt holes, then 2" square tubing down to another plate that mounts the custom isolator too the stock front crossmember.

The isolator I am making will be a single cylindrical piece out of 80 or 94 durometer Flexane (probably 94) with a bolt all the way through its center. I feel like I am over engineering it a little bit, but the last thing I want is for them to break on me. I am unsure what everyone else uses for their motor mount kits (mckinney, tophat, etc), so if anyone else has any ideas/comments they are appreciated.

[StricNyne]

idk mats used on tophat but i could post some pics of mine which are a lil beat up lookin heh

[kjlindgr]

What's worse...making it too strong or too weak?

[roadrunr]

Yeah I agree, in this instance "Overkill is Just About Right"

[rotorimp]

I have used the flexane for motor mounts and would actually go with a little less than 94 maybe 80. the 94 will transmit allot of vibration. Looks like your on the right track with material thickness--1/4 inch is overkill --Do you have a good handle on welding--I would say it is important as the material. I would like to see your progress!

[002-M-P]

A little bit of vibration doesn't matter that much to me because my original plan was to run solid motor mounts, but everyone tried to turn me off that idea...but I will keep the 80 in consideration.

I plan on welding everything up enough to support the motor and mock it up enough to measure for a driveshaft, then I am going to take it to my friend who does all of the TIG welding on our FSAE car's chassis, just to be extra sure it is all good.

So everyone things that 1/4 inch plate for the two mounting surfaces, then 1/4 wall 2"x2" square tubing for the support arm sounds good? What size bolt should be used for mounting the isolator to the subframe, 1/2-13?

[002-M-P]

seeing if there is anymore insight?

[Spazz]

1/2-13 bolts or studs out of B7.

or incolnel 718. u will break ur mounts into itty bitty peices before you break the bolt/stud.

[002-M-P]

Thanks I'll do the 1/2-13 in Grade B7 then.... What Grade nut (would be using a lock nut) would correspond to a B7 bolt?