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> Aftermarket TypeIV motor mounts, ...anyone have lightweight solid mounts?
Chris Hamilton
post Jan 22 2009, 05:40 PM
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Anyone here have leads on aftermarket motor mounts? I think I remember SirAndy having one made of box chromoly when he was still running a 4-banger. I'm looking for something solid and lighter than the stock bar.
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Mark Henry
post Jan 22 2009, 05:48 PM
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For the rubber mounts I wouldn't run anything but the stock mounts unless it's an all out race car. As for the bar you could fab up a bar that's lighter, but to be strong enough the weight savings would be small.
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Chris Hamilton
post Jan 22 2009, 08:02 PM
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QUOTE(Mark Henry @ Jan 22 2009, 03:48 PM) *

For the rubber mounts I wouldn't run anything but the stock mounts unless it's an all out race car. As for the bar you could fab up a bar that's lighter, but to be strong enough the weight savings would be small.


Yeah, I'm looking for a bar that's lighter than the stock one.

This is for my trailered racecar, you might have seen it before:

(IMG:http://www.thextremeresources.com/boshi/images/cars/aX1.jpg)
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Aaron Cox
post Jan 22 2009, 08:04 PM
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Make a pair on the lathe, shouldnt take you more than a half hour (IMG:style_emoticons/default/smile.gif) (assuming you have a sideshift)
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SGB
post Jan 22 2009, 08:29 PM
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Its been done. I think the weight savings were pretty minimal , as stated above. Seems like it wasn't even a full pound in reduced weight.
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McMark
post Jan 22 2009, 08:38 PM
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I wonder is a T bar would make it lighter. Four tubes for bolt passthrough, flat plate on top parallel to the ground, flat plate vertical.

I bet that would do it, and weight a lot less. (IMG:style_emoticons/default/idea.gif)

I have a mount bar laying around here. I could whip up a prototype... (IMG:style_emoticons/default/welder.gif)
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Chris Hamilton
post Jan 23 2009, 09:44 AM
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McMark that sounds interesting. I'm not sure what you mean though, you're talking about a motor mount like the -6 has?

Also anybody remember SirAndy's motor mount back when he had a type IV?
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J P Stein
post Jan 23 2009, 10:08 AM
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QUOTE(Chris Hamilton @ Jan 22 2009, 06:02 PM) *



This is for my trailered racecar, you might have seen it before:


Ayup, sure is ugly. (IMG:style_emoticons/default/biggrin.gif)
Pretty quick tho. 2nd place material.
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ChrisFoley
post Jan 23 2009, 11:06 AM
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Why would you want to lighten one of the lowest parts of the car? That will raise your cg.
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McMark
post Jan 23 2009, 01:22 PM
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Here's a mockup design.


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ericread
post Jan 23 2009, 01:29 PM
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How does your design ensure there is no rotational flex, or do you feel this is not an issue? Do you believe this design can meet the stock design of keeping the engine in a very static position?

(IMG:style_emoticons/default/idea.gif)
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McMark
post Jan 23 2009, 01:45 PM
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Eric, rotational stress along the length should occur between the center and the ends. There will never been end to end torsion, because the body is relatively solid (for the purposes of this design study). So you have a 1.75' section that's twisting, which is pretty short. I think the T-structure will provide sufficient strength.

Torsion comparisons between this design and the stock bar would be fairly easy to conduct. Drilling holes would also be an option that could be tested....
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ericread
post Jan 23 2009, 01:47 PM
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QUOTE(McMark @ Jan 23 2009, 11:45 AM) *

Eric, rotational stress along the length should occur between the center and the ends. There will never been end to end torsion, because the body is relatively solid (for the purposes of this design study). So you have a 1.75' section that's twisting, which is pretty short. I think the T-structure will provide sufficient strength.

Torsion comparisons between this design and the stock bar would be fairly easy to conduct. Drilling holes would also be an option that could be tested....


Cool (IMG:style_emoticons/default/aktion035.gif)

So how much weight do you anticipate saving?
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Mark Henry
post Jan 23 2009, 02:17 PM
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You will need a hole for the shift rod.
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J P Stein
post Jan 23 2009, 07:03 PM
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BTW, if ya'll want a rematch, it'll be at Packwood WA, August 8 & 9.
Ya'll come to our house & lay a whippin' on us'n & we'll call it even. (IMG:style_emoticons/default/biggrin.gif)

I think Andrew remembers this car.


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Chris Hamilton
post Jan 24 2009, 07:06 PM
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QUOTE(J P Stein @ Jan 23 2009, 05:03 PM) *

BTW, if ya'll want a rematch, it'll be at Packwood WA, August 8 & 9.
Ya'll come to our house & lay a whippin' on us'n & we'll call it even. (IMG:style_emoticons/default/biggrin.gif)

I think Andrew remembers this car.



Yeah I remember that second place you got to our first on sunday (IMG:style_emoticons/default/biggrin.gif) As I remember it we're already tied (BMWs don't count dammit )

How about a rematch without tire warmers? (IMG:style_emoticons/default/driving.gif)
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Chris Hamilton
post Jan 24 2009, 07:09 PM
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QUOTE(Racer Chris @ Jan 23 2009, 09:06 AM) *

Why would you want to lighten one of the lowest parts of the car? That will raise your cg.



I'm not too worried about the CG when the whole car needs to be lighter. By that logic we should be adding lead panels to the floors to lower the CG. Overall weight is a much more important factor right now.
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J P Stein
post Jan 24 2009, 07:21 PM
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QUOTE(Chris Hamilton @ Jan 24 2009, 05:06 PM) *

QUOTE(J P Stein @ Jan 23 2009, 05:03 PM) *

BTW, if ya'll want a rematch, it'll be at Packwood WA, August 8 & 9.
Ya'll come to our house & lay a whippin' on us'n & we'll call it even. (IMG:style_emoticons/default/biggrin.gif)

I think Andrew remembers this car.



Yeah I remember that second place you got to our first on sunday (IMG:style_emoticons/default/biggrin.gif) As I remember it we're already tied (BMWs don't count dammit )

How about a rematch without tire warmers? (IMG:style_emoticons/default/driving.gif)


Well the event was cumulative times for 2 days just like the SCCA does at the Nationals, but Andrew did a fine come back on day 2....... but not enuff to make up for the first day's ass kicking.

Sure, no tire warmers and no changing the car for day 2. (IMG:style_emoticons/default/biggrin.gif)

Brit's unfortunate cones after the lights on his last run let both you'z guys and the Beemer thru on day 2. We did OK for our first time on concrete *at your house*.
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Chris Hamilton
post Jan 25 2009, 12:52 PM
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QUOTE(McMark @ Jan 23 2009, 11:22 AM) *

Here's a mockup design.



I like that design, but the car still has a sideshifter and typical linkage. I'll have to take some measurements of the hole in the stock motor mount.
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McMark
post Jan 25 2009, 09:01 PM
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Clearance for the shifter wouldn't be too big of a deal. I'm searching for appropriate 'tubes' for the bolts to pass through.
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