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My friend has a very early IM  Convert D that he wants to change the windshield to the Speedster style.

Yes he knows the roll-up side windows are not going to work right , but thats OK with him.

So my questions .....  are the mounting holes for the uprights at the same place  for  both styles ?   anything else that might be a problem

As far as the folding top , which one will fit the mounting holes that are already there ?   Does he need to find a IM top frame or will a CMC / Fiberfab one work , 

or will one of the top frames made now fit ?

We are in Los Angeles so getting the parts is not that much of a hassle

Thanks for your help

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Well he would have to change the windshield frame the top,  the side windows and of course make sure the new frame is lined up so that the windows close and the rubbers lign up with the windshield frame.  A lot of work IMO when you guys can simply remove the top for the summer  and drive top down or put it under a cover.  Maybe someone would swap cars with him who wants a D.

@edsnova posted:

Hmm.

May I suggest some other mods "while he's in there?"

If it's IRS he should consider swapping it to swing axle, for example. And maybe add the auto-stick trans. Four-bolt wheels are an absolute must, as are flared fenders.

I'd also swap out whatever gauges are there for a set of white-faced "Vintage" gauges, like these:

—except the white kind.

That's a great list, Ed.  What about air ride suspension?

@imperial

Here's a visual reference in the differences between IM windshield placement (for roll-up windows) as opposed to windshield placement for most every other manufacturer.

IM with roll-up windows. Note arrow pointing out windshield frame positioned next door jam.

Click on pics to enlarge...

IM Windshield 1

IM positions windshield frame butting up to door jam so that rubber window seal (arrow) is aligned to accept window rolling up.

IM Windshield 2

Here is the typical position of a VS windshield frame (and probably other non-IM cars) relative to door jam with approximately 1.75" spacing (arrow).

IM Windshield 3

Hope you find this info useful!

Attachments

Images (3)
  • IM Windshield 1
  • IM Windshield 2
  • IM Windshield 3
Last edited by MusbJim
@Bob: IM S6 posted:

I once asked Henry about switching a Roadster to a Speedster, and he just said it wasn't worth it, considering the work involved and what you end up with.

@IaM-Ray posted:

Funny thing,  I asked to go the other way around and the same response came back

… and I once asked how much it would cost to convert my front suspension to early 911, and got the same response.

He was right about all three.

This info is based on later IMs so mileage will differ on older cars and different makes

Just on the windshield aspect;

Holes in body for the windshield posts are in different locations.

The windshield "plate" under the dash is different, same with the "plate" for the mirror rod

Location for mirror rod is different (length of rod is different too)

Base of the speedster windshield is further forward compared to the roadster, so leather will be too short, and the roadster windshield cowl trim holes will be shown (easy fixed with body filler and new leather/vinyl)

Never mind top frame mounting, side glass / curtains, etc .  To have someone do it, it makes no sense, but doing itself maybe? would i do it, knowing what i know, hmm no. 

@91_XR7 posted:

This info is based on later IMs so mileage will differ on older cars and different makes

Just on the windshield aspect;

Holes in body for the windshield posts are in different locations.

The windshield "plate" under the dash is different, same with the "plate" for the mirror rod

Location for mirror rod is different (length of rod is different too)

Base of the speedster windshield is further forward compared to the roadster, so leather will be too short, and the roadster windshield cowl trim holes will be shown (easy fixed with body filler and new leather/vinyl)

Never mind top frame mounting, side glass / curtains, etc .  To have someone do it, it makes no sense, but doing itself maybe? would i do it, knowing what i know, hmm no.

Thanks for your reply ,  I showed your list to my buddy and he still wants to do it !

The dashboard cowl does not have any trim / vinyl so the  thats not a problem , the doors are going to stay Convert D ,

The real problem seems to be the location  of the windshield plate which I assume is where the side posts bolt too , when we get the car out of storage  I will measure where that is ,

I have access to a couple real Speedsters  so I can look at them....

Or he could do a plexiglas race windscreen  like the vintage racer use.....

Thanks again for your reply , I agree that it makes no sense , but its his  choice .

@imperial posted:

The dashboard cowl does not have any trim / vinyl so the  thats not a problem , the doors are going to stay Convert D ,

The real problem seems to be the location  of the windshield plate which I assume is where the side posts bolt too , when we get the car out of storage  I will measure where that is ,

I have access to a couple real Speedsters  so I can look at them....

Or he could do a plexiglas race windscreen  like the vintage racer use.....

Thanks again for your reply , I agree that it makes no sense , but its his  choice .

I know on later IMs, the windshield posts are bolted in different locations (IE the holes in the cowl are not the same)  

on the side glass side with a piece of 1/8" ply as a template, you can even do roll up windows like IM did at the end with their Speedsters instead of side curtains.  (every little bit of visibility added is not a bad thing..)

Windshields, luckily speedster windshields are easier to get then the Convertible D ones (IM was having those custom made for them at the end)

Heh yep i agree, his car his choice.

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