I think the main problem here is some people have elected to weigh their cars on inappropriate equipment for the job. You simply cannot take your ~3000lb Fiero to a scale desiged to hold a 100,000 lb semi truck and expect to get an accurate measurement. Do you really think your little ~3000lb car can load the spring of that 100,000 lb or so capable truck scale enough to give you an accurate reading?
Back before I turboed my 3800, I weighed it on purpose-built race car scales. These were seperate scales for each tire and the results can be seen here:
http://dtcc.cz28.com/87fiero/weight.htm (2920 lbs). Some years later I was at a dragstrip that had a drive-on scale
made for cars and it showed my now-turboed Fiero's weight to be 2940 lbs. with about 1/2 tank of fuel and me not in it.
Now before I put this LS4 engine into the Fiero, I had the heads off of it which made it light enough to put on my shipping scale. I weighed many individual components of the engine and documented them...
Shortblock (dry): 259 lbs (incl crank, rods, pistons, cam, lifters, oil pan, balancer)
Heads (each) : 23 lbs (incl valves, springs, retainers, locks)
Pushrods/rocker arms: 13 lb
Valve covers (both): 6 lb
Intake, TB, hardware, fuel rails: 17 lb
Misc brackets, hardware: 21 lb
Front cover / water pump: 15 lb
starter, alt, hardware: 24 lb
mounts, pulleys, hardware: 12 lb
coil packs (both banks): 8 lb
a/c compressor: 15 lb
head gaskets: 2 lb
head bolts, other gaskets, hardware: 5 lb
front exh manifold: 16 lb
rear exh manifold: 11 lb
exh crossover: 8 lb
That's 478 lbs right there and I didn't even throw in the weight of the wiring harness, computers, or power steering pump. But the above individual weights of components should give you a pretty good idea how quickly the weight of your engine, as installed in the car, can really add up fast. So if you pulled your engine out of a crate and it only weighed xxx lbs then, have you factored in the amount of weight you added to that engine in bolts, mounting brackets, assy's, fluids, etc. once you got it installed into the car? (BTW, no I haven't weighed this LS4 swapped Fiero yet but I am currently researching that option if nothing more than to satisfy my own curiosity.)
Something I would really like to see at the 25th anniv. Fiero show is a drive-on CAR scale somebody can bring in so everybody who wants can weigh their car and compare their results with others that weighed on the same scale on the same day. That should put a lot of this "bench weight-racing" going on here to rest, once and for all.
-ryan
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power corrupts. absolute power corrupts absolutely.
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