Weighed the car again.

[69427]

Hauled the car over to a local scale to get the updated weight (no driver, 1/8 tank of fuel). The scale read 2915 pounds (I haven't gotten around to putting the rear bumpers and spare tire bucket back on, so add 35 pounds to the total), pretty much exactly 100 pounds different than previously with the other engine. According to a couple postings I've seen of the weight of an iron block, the expected delta should be 135 pounds (110 vs 245). So, I'm trying to figure out where the other 35 pounds went. I weighed the engines as I pulled the old one out and put the new one in, and saw aproximately 100 pounds difference, and attributed part of the "missing 35 pounds" to some remaining inaccuracy in the scale calibration (I had to go through some odd gymnastics to get the scale reasonably dialed in). But, it appears that my hanging scale may be reasonably accurate. I need to get an actual weight (versus an educated guess) of a bare iron block sometime to help me figure out what the deal is. (The crank weights are within two pounds of each other, and the new pistons and rods are a touch lighter.)
So, I'm just a bit puzzled here.

 

[TimAT]

I've got a bare iron block at the house. Next time I get home, I'll sneak the bathroom scales out and weigh it. It's .060 over, no cam bearings or freeze plugs. Should get you close.

 

[mrvette]

What is harder, loosing weight off US? or the Sharks??

:cussing::goodevil::twitch:

 

[Beagle 1]

Hauled the car over to a local scale to get the updated weight (no driver, 1/8 tank of fuel). The scale read 2915 pounds (I haven't gotten around to putting the rear bumpers and spare tire bucket back on, so add 35 pounds to the total), pretty much exactly 100 pounds different than previously with the other engine. According to a couple postings I've seen of the weight of an iron block, the expected delta should be 135 pounds (110 vs 245). So, I'm trying to figure out where the other 35 pounds went. I weighed the engines as I pulled the old one out and put the new one in, and saw aproximately 100 pounds difference, and attributed part of the "missing 35 pounds" to some remaining inaccuracy in the scale calibration (I had to go through some odd gymnastics to get the scale reasonably dialed in). But, it appears that my hanging scale may be reasonably accurate. I need to get an actual weight (versus an educated guess) of a bare iron block sometime to help me figure out what the deal is. (The crank weights are within two pounds of each other, and the new pistons and rods are a touch lighter.)
So, I'm just a bit puzzled here.

Weight of oil?? Not 10/30, pounds.

 

[69427]

Weight of oil?? Not 10/30, pounds.

Both engines were drained of coolant and had full oil capacity (6 quarts) in them.

 

[69427]

I've got a bare iron block at the house. Next time I get home, I'll sneak the bathroom scales out and weigh it. It's .060 over, no cam bearings or freeze plugs. Should get you close.

Thanks, Tim.

 

[BBShark]

I have a chart (unknown source) that list a fully dresses Mark IV @ 685lbs and a fully dressed ZL-1 @550lbs. So if you had an iron block with aluminum heads before, you probably lost the 35lbs there. So maybe your Mark IV with aluminum heads was 650 and ZL-1 is 550?

Salee Chevrolet used to list weights of stuff. They sold the limited production ZL-1 reissue and listed a ton of info about weights. Not sure what happened to Salee but the information is all gone.

 

[69427]

I have a chart (unknown source) that list a fully dresses Mark IV @ 685lbs and a fully dressed ZL-1 @550lbs. So if you had an iron block with aluminum heads before, you probably lost the 35lbs there. So maybe your Mark IV with aluminum heads was 650 and ZL-1 is 550?

Salee Chevrolet used to list weights of stuff. They sold the limited production ZL-1 reissue and listed a ton of info about weights. Not sure what happened to Salee but the information is all gone.

The old engine and the new one are essentially identical with the exception of the block. I transplanted the aluminum heads, aluminum w/p, aluminum intake, and every non shortblock item onto the new shortblock.
My (reasonably accurate) hanging scale registered 605# for the old engine below (which had aluminum heads and aluminum water pump), complete (less headers) and with the stock aluminum bellhousing and lightweight L-88 flywheel and pressure plate. I was then getting around 505# for the new engine in the same configuration. (I zero'd out the weight of the hoist chain each time.)



I'm anxious to see what Tim finds out regarding the iron block weight. The more I think about it the more I am wondering if the iron blocks are less than the 245 pounds I was told. Usually when I encounter an aluminum substitute for something the aluminum part weight is around 70% of the steel/iron part weight. The ratio of 110#/245# comes out to about 45% which is obviously much lighter than the 70% I'm used to.