Another jack point question

[Grant Lenahan]

i know all about jacking from beneath the frame supports, as shown in the picture below. However, i'd prefer a center point where i can raise both sides evenly ( faster, easier, less likely to tip). This way i can raise both the jack-stands that are under the official jack points.

See pic. Can the center point, toward the rear, by the muffler, where a trapezoidal aluminum support piece connects up to the end of the frame rails, be safely used? I'd put a hockey puck on my floor jack, lift and raise the jack stands.

TIA as usual. See pic. Point is to right of where Wayne has his jack positioned.



Grant

[Zeke]

Lifting there will raise both rear wheels.

[Grant Lenahan]

thanks Milt, but my question is "is it sufficiently strong to be completely safe?"

Grant

[dad911]

I have not tested it, but I'm not sure it would be a great spot longterm. The aluminum diagonal is not very large. I believe it is just used to triangulate the underpan.

I would jack from the points shown in the pic, which is directly under the aluminum subframe. Or from the jack points directly in front of the wheel.

[Zeke]

Originally Posted by Grant Lenahan

thanks Milt, but my question is "is it sufficiently strong to be completely safe?"

Grant

I think your question is can you move the jack to the center. Why would you if it's not recommended and the place shown in the pic will do the same?

AFA that goes, I have never seen anyone post that he broke a part under a Boxster with a jack.

[Grant Lenahan]

Thanks agaion.

Now, as to why i dont use the "official" places - well, actually, according to porsche there are only 4 recommended places. The reinforced jack points. Those are in use for the jack-stands, so they are out. After that the question becomes "where is it strong?" Which is my question here :-) As to "why would i"? - easy: its central, allowing the car to be lifted with tilting - much more stable; less likely to place a side-load on the jack stands. To be clear - the place that Wayne suggested does NOT do the same thing at all - its lifts one side, placing the car at a significant angle a it gets higher and higher. And the side load, if physics has not been repealed, is very roughly the sine of that angle times the weight... significant.

Anyway, i guess no one's used this point, huh? Its widely used by racers, btw, but those "spec" cars are lighter, and for all i know, they don't mind occasional damage since they probably rebuild things regularly.

But this would make things MUCH, MUCH easier for me - so i'm still fishing for some "BTDT". Its hard to tell from the small B&W picture, but i actually think the Bentley manual specifies it as a lifting point.

Thanks again for takign the time to contribute!

Grant

[harryrcb]

I would not jack there you will be over-stressing all the suspension bushings on that side but there is a steel cross brace that runs just behind the oil pan where the aluminum tray has it front 2 bolts, if you place a block of wood on the jack and in between the bolts you can get away with that, I will try to locate a pic for you.
OK my pic link is not working but I have lifted there safely many times. when I get the link working I will forward the pic

[harryrcb]

for some reason I cannot upload pics but if you Look in my garage there is a pic of the area I am talking about showing the deep sump pan and the 2 bolts where its safe to lift from

[Grant Lenahan]

thanks harry. If i can figure out ho i'll check your garage. incidentally, to load a pic you just click "go advanced", then "upload picture", then "browse" then "upload" and voila. Its easy.

I think we're confusing points though. The jacking spot i am suggesting is nto connected to ant suspension bushings. It is -- check my description again -- the two bolts on a heavy, aluminum, trapezoidal piece that runs up to the rear ends of the frame rails. In my pic it is behind and to the center of where wayne's jack is. This sounds like its maybe where you are referring to??? Not sure. Maybe i can edit and re-upload my pic with the area circled.

Grant

[Grant Lenahan]

harry - nothing in your "garage" but a pic of your car. What a surprise, a boxster :-)

[mikefocke]

Click on garage text, when the picture of his car is displayed, click on the image, his garage appears and about the 5th picture on the right from the top shows what he is talking about.

[Grant Lenahan]

that'll work - a bit further in than i was hoping for, but centered. My remaining question is: do you need to get something that touches only the bolts, or can you lift from the flat apparently stamped metal between them with a sufficiently large block of wood?

Thanks to mike for helping me navigate.

Grant

[harryrcb]

Originally Posted by Grant Lenahan

thanks harry. If i can figure out ho i'll check your garage. incidentally, to load a pic you just click "go advanced", then "upload picture", then "browse" then "upload" and voila. Its easy.

I think we're confusing points though. The jacking spot i am suggesting is nto connected to ant suspension bushings. It is -- check my description again -- the two bolts on a heavy, aluminum, trapezoidal piece that runs up to the rear ends of the frame rails. In my pic it is behind and to the center of where wayne's jack is. This sounds like its maybe where you are referring to??? Not sure. Maybe i can edit and re-upload my pic with the area circled.

Grant

Yes I know how to upload , my computer just refused to do it. when I clicked on the pic attachement nothing happened. I will try again. nope just gives me "error on page" there is a pic of the underneath in my garage somewhere under mods. I don't know how you would get to it. Ill try rebooting my computer

[harryrcb]

Originally Posted by Grant Lenahan

that'll work - a bit further in than i was hoping for, but centered. My remaining question is: do you need to get something that touches only the bolts, or can you lift from the flat apparently stamped metal between them with a sufficiently large block of wood?

Thanks to mike for helping me navigate.

Grant

JUST THE BOLTS, the flat is aluminum sheet metal and if you get too far back it will buckle up to the tranny, at the bolts there is a steel bar that runs from the left to right suspension.

[harryrcb]

hope its not too late but here is the pic of the underside

[Grant Lenahan]

yes, i fund it. thanks again.