[Z06] Z06 Diet
12-28-2014, 06:19 PM
#21
Safety Car
Thread Starter
Not sure if the Braille battery is a AGM type battery, because if it is, your tender needs to be able to charge at no more than 1.5 amps.
12-28-2014, 06:21 PM
#22
Safety Car
Thread Starter
12-28-2014, 07:24 PM
#24
Melting Slicks
I'd be very suspicious of the engine weight difference. Need to see an "apples to apples" comparison there. 40 pounds is huge and it is more likely that the comparison is a fully dressed engine vs the shipping weight of a crate motor, or something like that. Sounds more like a weight with and without a flywheel or something like that.
Then remember that you need to add a dry sump to the 7, unless you go back to the C5Z pan and pump (if it even fits).
It's just hard to believe that the LS7 is that much lighter.
Then remember that you need to add a dry sump to the 7, unless you go back to the C5Z pan and pump (if it even fits).
It's just hard to believe that the LS7 is that much lighter.
12-28-2014, 07:54 PM
#25
Safety Car
Thread Starter
I'd be very suspicious of the engine weight difference. Need to see an "apples to apples" comparison there. 40 pounds is huge and it is more likely that the comparison is a fully dressed engine vs the shipping weight of a crate motor, or something like that. Sounds more like a weight with and without a flywheel or something like that.
Then remember that you need to add a dry sump to the 7, unless you go back to the C5Z pan and pump (if it even fits).
It's just hard to believe that the LS7 is that much lighter.
Then remember that you need to add a dry sump to the 7, unless you go back to the C5Z pan and pump (if it even fits).
It's just hard to believe that the LS7 is that much lighter.
The weight of these engines isnt news, its been known for many years already.. it was another deciding factor why I went with it.
Plus I went with a wet sump, so no added weight with the dry sump.
12-29-2014, 07:54 AM
#26
Race Director
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12-29-2014, 02:12 PM
#28
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12-29-2014, 10:11 PM
#29
Melting Slicks
Do the research.. the info is out there. Both fully dressed engines are with exhaust manifolds, clutch and flywheel. The LS7 clutch/flywheel weighs 60 lbs vs 50 lbs for the LS6.. so actually the engine itself is 60 lbs lighter.
The weight of these engines isnt news, its been known for many years already.. it was another deciding factor why I went with it.
Plus I went with a wet sump, so no added weight with the dry sump.
The weight of these engines isnt news, its been known for many years already.. it was another deciding factor why I went with it.
Plus I went with a wet sump, so no added weight with the dry sump.
The LS6 was never configured as an automatic, and the clutch assembly was included in the fully dressed engine weight. The LS7 clutch weighs 25.5 pounds. Add that to the listed weight of the LS7 and the weight of the LS7 goes up to 483.5 pounds.
So the real difference between an LS6 and an LS7 similarly equipped and ready to be dropped into the car is actually only 13.7 pounds. The lighter connecting rods account for 2.2 pounds of that, and the LS7 has lighter weight stainless steel exhaust manifolds. If you are going to put on a set of headers a chunk of that 13.7 pounds weight savings is gone since no matter which engine you have the headers will weigh pretty much the same.
Bottom line is that the LS7 is indeed lighter, but when it's on the hook and ready to be installed don't think that it's going to be 40 pounds lighter because that's just not the case, the real number is less than 14 pounds. If you're going to use a set of headers the LS7 isn't going to change the weight of the car by much if at all.
Last edited by Solofast; 12-29-2014 at 10:20 PM.
12-29-2014, 11:33 PM
#30
Safety Car
Thread Starter
Actually I did the research and the LS7 weight is listed as 458 pounds. That does NOT include the clutch assembly as the LS7 crate motor is delivered with the flywheel, but without the clutch assembly.
The LS6 was never configured as an automatic, and the clutch assembly was included in the fully dressed engine weight. The LS7 clutch weighs 25.5 pounds. Add that to the listed weight of the LS7 and the weight of the LS7 goes up to 483.5 pounds.
So the real difference between an LS6 and an LS7 similarly equipped and ready to be dropped into the car is actually only 13.7 pounds. The lighter connecting rods account for 2.2 pounds of that, and the LS7 has lighter weight stainless steel exhaust manifolds. If you are going to put on a set of headers a chunk of that 13.7 pounds weight savings is gone since no matter which engine you have the headers will weigh pretty much the same.
Bottom line is that the LS7 is indeed lighter, but when it's on the hook and ready to be installed don't think that it's going to be 40 pounds lighter because that's just not the case, the real number is less than 14 pounds. If you're going to use a set of headers the LS7 isn't going to change the weight of the car by much if at all.
The LS6 was never configured as an automatic, and the clutch assembly was included in the fully dressed engine weight. The LS7 clutch weighs 25.5 pounds. Add that to the listed weight of the LS7 and the weight of the LS7 goes up to 483.5 pounds.
So the real difference between an LS6 and an LS7 similarly equipped and ready to be dropped into the car is actually only 13.7 pounds. The lighter connecting rods account for 2.2 pounds of that, and the LS7 has lighter weight stainless steel exhaust manifolds. If you are going to put on a set of headers a chunk of that 13.7 pounds weight savings is gone since no matter which engine you have the headers will weigh pretty much the same.
Bottom line is that the LS7 is indeed lighter, but when it's on the hook and ready to be installed don't think that it's going to be 40 pounds lighter because that's just not the case, the real number is less than 14 pounds. If you're going to use a set of headers the LS7 isn't going to change the weight of the car by much if at all.
I'm not here to argue.. I have found info stating 40-60 lbs less so I took the average. All numbers I was taking into account were fully dressed crate engines that came with manifolds, flywheel and clutch.
12-30-2014, 08:51 AM
#33
Melting Slicks
http://www.chevrolet.com/content/dam...tion-guide.pdf
Think about it for a minute, these engines are all based on very similar block and heads. Yes the LS7 has Ti rods, but that's only two pounds less. The 7 has a longer throw crank, iron liners, a heavier flywheel, and lots more stuff that while small does weigh something. The big weight loss was getting rid of the cast iron exhaust headers for the stainless ones. Forty pounds is a huge chunk of aluminum.
Aluminum weighs .1 pounds per cubic inch so 40 pounds is about 400 cubic inches or about the size of a jug a gallon and a half in volume. There isn't that much more aluminum in the LS6 than the LS7.
In terms of steel, 40 pounds is a big chunk of steel too. A little bit bigger than a two liter jug. Again there simply isn't that much difference unless you leave off something big, like the clutch.
Just remember that "fully dressed" can mean a lot of things and the folks that are selling these crate engines are in an advertising mode. Making the weight look as low as possible means sales. The clutch and the exhaust manifolds are where the big weight differences are, and you are going to need a clutch, and if you use similar weight headers there isn't going to be much difference.
Sorry, but that's the reality of the situation.
Last edited by Solofast; 12-30-2014 at 09:08 AM.
12-30-2014, 10:32 AM
#34
Safety Car
Thread Starter
I hear what you're saying but I prefer going with numbers where someone actually put things on a scale to get first hand data vs what a manual says.
Last edited by PeteZ06; 12-30-2014 at 01:26 PM.
12-30-2014, 03:07 PM
#36
Melting Slicks
The LS7 weights include the Corvette pan and pump as run in the Corvette, but do not include the external dry sump tank and the related plumbing. If you are going to run a dry sump that will also cost you some weight that isn't in the numbers. If you go wet sump you will have to change the oil pump and the oil pan.
12-31-2014, 10:45 AM
#37
Drifting
01-02-2015, 10:11 PM
#38
Safety Car
Thread Starter
Dropped 35 lbs today. Weighed everything with a digital scale.
Power seat tracks with seatbelt receiver are 21 lbs.
Manual seat tracks with seatbelt receiver are 10 lbs.
Pulled out my stock battery.. 35 lbs
Got a Braille 14115.. 11 lbs
Still cannot believe that little battery starts up my 427 with ease!!
Power seat tracks with seatbelt receiver are 21 lbs.
Manual seat tracks with seatbelt receiver are 10 lbs.
Pulled out my stock battery.. 35 lbs
Got a Braille 14115.. 11 lbs
Still cannot believe that little battery starts up my 427 with ease!!
01-04-2015, 01:03 PM
#39
Safety Car
Thread Starter
Since they discontinued doing 1/2 mile races in my area for the time being.. I'm going back to a shorter tire..
Current rears are 33 lbs each.. Going with 315/30/18 Hoosier DRs.. 24 lbs each
Stock runflats were 33 lbs as well.
Plus I found a local shop that sells rear race rotor at 9 lbs.. Stockers are 14 lbs.
That's 28 lbs of unsprung weight saved!!!
Current rears are 33 lbs each.. Going with 315/30/18 Hoosier DRs.. 24 lbs each
Stock runflats were 33 lbs as well.
Plus I found a local shop that sells rear race rotor at 9 lbs.. Stockers are 14 lbs.
That's 28 lbs of unsprung weight saved!!!
Last edited by PeteZ06; 01-04-2015 at 01:10 PM.
