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Old 05-07-2008, 06:40 PM   #1 (permalink)
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weight difference - aluminum versus cast iron block?

Doing a little daydreaming about someday swapping all my engine parts over to an all aluminum Dart block. Does anyone happen to know how much the weigh difference will be? A cast iron block weights...what? 150lbs?

I figure that plus swapping to an aluminum rear center section (IRS) would make for a real featherweight!
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Old 05-07-2008, 06:58 PM   #2 (permalink)
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I would say since a 347 is a bored & stroked 302 you would be looking @ less than 90 lbs and over $5 grand.
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Old 05-07-2008, 08:13 PM   #3 (permalink)
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For the block, weight savings is about 80#. Additional cost is about $2,500.

For the diff, weight savings is about 10#. Additonal cost is about $150.

IMO, not worth it unless you're building an all out race car where every ounce counts. Or you're Bill Gates and a few extra pennies won't matter.
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Old 05-07-2008, 08:38 PM   #4 (permalink)
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Definitely not Bill Gates, nor building an all out race car. Just daydreaming about future possibilities (the car's not even done and I'm already thinking about upgrades - am I addicted or what??). Being a motorcycle roadracer, I'm obsessed with weight savings - when the bike and rider as a package can weight less than 500 pounds, every once counts.

As far as dollars per pound saved, I agree it's totally ridiculous...then again, I think we can all agree that practicality pretty much went out the window when you placed the order with FFR! LoL
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Old 05-08-2008, 11:57 AM   #5 (permalink)
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Believe just changing to alum heads it safes 50 or 75lb's?
If nothing else it sure makes picking them up easyer
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Old 05-08-2008, 12:13 PM   #6 (permalink)
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iron heads are 50# heavier than al.
a levy super duty T5 is almost 100lbs lighter than a TKO or tremec
302 is 65lbs lighter than a 351
an al. bell housing with a kevlar blanket is 30lbs lighter than a meclod bell housing
you can save at least 100lbs if you can find an old carbon body
you can save 20lbs or so with radial forged wheels or race wheels
you can save 50lbs using 3-link instead of IRS

my car weighs 2130 dry, 302, al heads, T5, al. bell housing, 8.8 rear, TeamIII wheels, V710 race tires, no interior
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Old 05-08-2008, 02:35 PM   #7 (permalink)
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Quote:
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you can save 50lbs using 3-link instead of IRS
Really? That one surprises me. I figured it was a toss-up, maybe the IRS was a few pounds (10-20) heavier (but with far less unsprung weight). I'm not saying you're wrong, but can you document that somehow?

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my car weighs 2130 dry, 302, al heads, T5, al. bell housing, 8.8 rear, TeamIII wheels, V710 race tires, no interior
That's pretty light! I'm curious to see where mine ends up when all is said and done.
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Old 05-09-2008, 12:00 AM   #8 (permalink)
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Ive read it a bunch of times, of course you save 10 lbs with a al. diff. Maybe try a forum search. A lot of guys like the 3-link cobra better than IRS on the track (Levy, Dan Elam etc.). I was giving you some examples on where weight savings can be other than an aluminum block motor. You can save almost 200 lbs by using a 302 based motor, Levy super duty T5 and al. bell housing with a kevlar blanket - instead of a 351 based motor, TKO500 and Meclod scatter shield.
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Old 05-16-2008, 03:06 PM   #9 (permalink)
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Also, don't forget all the mods and creature comforts that add weight - do you need an oil cooler? Probably not. Leave off all the insulation, fat mat, etc. Leave off passenger rollbar, carpet, door panels. Go with light weight seats. Forget PS, PB, heater, A/C, maybe even wipers?

If lightweight is your goal, the cheapest way is by deleting things.

Oh yeah, one other thing, the driver should lose weight! (Not directed at you, but a general statement. Even Indy cars are now basing weight on car + driver because Danica is 20-40# lighter than other drivers.
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Old 05-16-2008, 03:35 PM   #10 (permalink)
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Quote:
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a levy super duty T5 is almost 100lbs lighter than a TKO or tremec
A TKO is 105#. I have picked up Gordon's SD T5 and it is more than 5#.
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Old 05-16-2008, 11:36 PM   #11 (permalink)
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opps
T-5 75lbs
TKO 105lbs
T-56 129lbs

there is a big weight difference between the T-5 alum. bell housing vs. a meclod scatter shield, about 40-50lb.
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Old 10-20-2008, 05:32 PM   #12 (permalink)
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How much does a stock aluminum T-5 bellhousing weigh? I've seen some universal McLeods in the 45 lb range. Blankets are listed as ~5 lb. I'm guessing the aluminum bell housing would be around 20-25 pounds, wouldn't it?

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Old 10-20-2008, 10:43 PM   #13 (permalink)
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Quote:
Originally Posted by Michael Stora View Post
How much does a stock aluminum T-5 bellhousing weigh? I've seen some universal McLeods in the 45 lb range. Blankets are listed as ~5 lb. I'm guessing the aluminum bell housing would be around 20-25 pounds, wouldn't it?

Mike
aluminum 18-20 lbs in box

quicktime 6060 25 lbs in box
quicktime 6065 29 lbs in box

also the aluminum blocks tend to weigh more or same as stk due to more strength being built into the design

that said mike has an alum block here at the shop for purchase/build = older ford block 302
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Old 10-21-2008, 08:25 AM   #14 (permalink)
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al t5 bellhousing weighs 7 lbs.
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Old 10-24-2008, 11:33 PM   #15 (permalink)
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It would and I couldn't give you a number but it is dramatic. Plus switching to dart heads is gonna give you a dramatic increase in horsepower. The flow that dart heads have is an incredible.
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Old 01-13-2009, 07:43 PM   #16 (permalink)
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My car is 2250 with all the fluids in it, half tank of gas, and IRS... oh, and iron heads, I'm guessing I could get 150lbs off with better wheels and alum heads and a few other goodies.
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