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Old 03-06-2011, 09:00 AM
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Fill gap between frame, boxing plate & IFS?

1934 Ford 3W coupe. Original frame with Heidts IFS. Appreciate your suggestions on how to fill gap between frame rails, boxing plates & IFS crossmember. Boxing plates are 3/16" & rails are 10 gauge each (inner and outer rails). Rails need to be 27 3/8" OD for IFS geometry. Gap is 3/8". Boxing plates makes up half (3/16") leaving 3/16" gap on each side with IFS crossmember centered in rails.

Options include:

1) Filler plate goes between frame rails & boxing plates. Fills gap but forces boxing plate to bow out and back in. One of two options recommended by Heidts.

2) Filler plate goes between boxing plate and IFS crossmember. Easier but less pretty (not concerned about pretty, will be full hood incl sides).

3) Use 3/8" boxing plate. Entire length of boxing plate is thicker (~25% heavier & more narrow engine compartment possibly affecting engine mounts & engine fitment) Not 50% heavier because if 3/16" boxing plate used there will be a 3.25" x 12" x 3/16" backer support plate welded to back of boxing plate centered at engine mount position). One of two options recommended by Heidts.

4) Squeeze rails to close gap. Heidts does not recommend this as it may / will affect front end geometry.

Pictures show filler plate on either side of boxing plate (between rails & boxing plate not in final position just there to show where it would go). Filler plates in pictures are not 3/16". Made them up out of 10 gauge for mock up and decision process.

Any thoughts on these options or other options are appreciated. Ready to finalize decision, mock it up and tack weld it. Thanks guys.
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Old 03-06-2011, 11:45 AM
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I think I would go ahead and complete the boxing plates and then install the crossmember..looks like there is a bit of taper to the fitment of the crossmember so I would trim just a wee bit to make the gap parallel and then place a shimplate of the proper thickness in the resulting gap..hope this is a bit of a help..

Sam
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Old 03-06-2011, 05:50 PM
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Onemoretime - thanks. Your approach is the one I prefer. Just trying to get more feedback and possibly more options. I did some grinding to make the 3/16" boxing plates a bit smaller. Now I have a 90 degree step to weld into. The boxing plates cover the inner frame rail but not the outer rail. I will give it a day or two then finalize my approach and weld it up. Thanks again.
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Old 03-06-2011, 07:53 PM
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The boxing plates on the frame for my 34 (Roadster Shop) come a little more forward than where yours stop. I only have about 3" of open frame rail in front. I think your on the right path with the decision you made. Just make sure you make multiple weld passes on the cross member to frame connection.

Vince
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Old 03-06-2011, 09:14 PM
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Quote:
Originally Posted by OneMoreTime
I think I would go ahead and complete the boxing plates and then install the crossmember..looks like there is a bit of taper to the fitment of the crossmember so I would trim just a wee bit to make the gap parallel and then place a shimplate of the proper thickness in the resulting gap..hope this is a bit of a help..

Sam
^^^^^ x2
thats what i would do
box it , then trim crossmember so filler plates fit nice
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Old 03-07-2011, 08:08 AM
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302 z28 - Thanks. I noticed that the boxing plates were a bit short when I mocked them up with the IFS and positioned the radiator flange / mounts. My plan is to either make up small boxing plates to go from the front end of current boxing plates and extend forward or make longer boxing plates. There should not be much weight / pressure / torque on the radiator mounts so 3/16" plate welded to rails top and bottom and along side that butts to existing boxing plate should work well.

matts37chev - Thanks. I am feeling more confident about this approach.

Thanks for your feedback guys.
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Old 03-08-2011, 01:27 AM
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Make sure that you use the chassis centerline for positioning the IFS crossmember!
Just placing the crossmember with equal gaps on each side might not be correct.
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Old 03-08-2011, 09:03 PM
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staleg - thanks for responding. I have the center of the IFS crossmember centered with the center of the chassis. Ground the crossmember accordingly. Pictures are in my Project Journal on this sight. Search ctkid343w and check it out. Let me know if you see anything that is not right.

I decided to fabricate small boxing plates and add them to the existing plates rather than make longer ones. I will be uploading more pictures in the next day or two.

Thanks for your feedback.
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