Differences between o.s speed .21 v-spec speed alum and magnesium.
#1
Differences between o.s speed .21 v-spec speed alum and magnesium.
Is there any difference between these engines other than the heads?
Im looking to buy one, and i have found one for a good price.
There is a 20-30 dollar difference between the engine and since the difference is so small i wonder what engine will hande heat best. The aluminum head or the Mag head.
Alu head
Magnesium
Im looking to buy one, and i have found one for a good price.
There is a 20-30 dollar difference between the engine and since the difference is so small i wonder what engine will hande heat best. The aluminum head or the Mag head.
Alu head
Magnesium
#2
Searched more and found this.
http://www.rctech.net/forum/showthre...ight=o.s+speed
Sorry for any anoyance.
http://www.rctech.net/forum/showthre...ight=o.s+speed
Sorry for any anoyance.
#3
Registered User
Yes thats correct, the thermal conductivity of aluminium is greater than magnezium... therefore better heat transfer and better cooling.
#4
I didn't read that but Magnesium is harer to work with and is more expensive. It doesn't handle the heat quite as well but it's lighter. That was the advantage of it.
The Aluminum ead Speed is the same motor with an aluminum head to help dissipate the heat better. When it's a little cooler out I'll use my Mag head. I was using the Mag head motor in Arizona for awhile though, and I had no issues.
The Aluminum ead Speed is the same motor with an aluminum head to help dissipate the heat better. When it's a little cooler out I'll use my Mag head. I was using the Mag head motor in Arizona for awhile though, and I had no issues.
#5
Tech Elite
iTrader: (17)
Weight is the biggest difference between the two. The magnesium version will take some weight off the top of the car. Other than that, I have seen no heat related differences or issues between the two versions. I have been around quite of few of these engines so far, personally owning two Mag versions myself, and tuning a couple AL versions at the same time.
#9
crank pin is the small pin found on the end of a crankshaft that the conrod pivots on. most crankshafts show some wear here, but because of the DLC (hardcoating) process of the OS speed, there is pretty much no wear at all
#12
if you use a speed crank, you have to use a speed rod...