On Tue, 25 Sep 2007 01:19:02 GMT, "aemeijers"
wrote:


"Edwin Pawlowski" wrote in message
news:NYTJi.6028$ax2.4483@trndny08...

"HeyBub" wrote in message

I suppose it could happen, but I've seen cars on cinder blocks, in
someone's front yard, for DECADES and the blocks haven't crumbled yet.


Probably will sit many more decades. OTOH, a block that was sledged out
of a wall may not be quite as strong or can have stress cracks in it. I'd
not trust my life to it.
Even as a kid, I knew to only use SOLID concrete blocks under a car. I
preferred to use timbers, if I had them on hand. Even with a solid block,
I'd use a piece of 2x above it to reduce the chance of a metal edge
splitting the block. And I'd never crawl completely under a car held up like
that, just use it to hold up a corner where I had a wheel off or something.

aem sends...

I wouldn't use anything but solid blocks either, all the cautions you
all have said, no matter how many cars have sat on open ones.

I had a pair of steel jackstands, the kind about 15 inches high with
three angle iron legs leading up to an adjustable pipe in the middle,
rated by the manufacturer at far more than the load that was on the
one I was using.

It only had the plymouth version of a Chrysler LeBaron, a K-car, and
lt crumbled. Worse yet, it happened when I was in the house and I had
left an 18 year-old boy with the car. Fortunately he wasn't under the
car. And it didn't bend all the way down, and he was pretty thin, so
he might have made it.