Hans_Andersson

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

Hans_Andersson

Searched more and found this.

http://www.rctech.net/forum/showthre...ight=o.s+speed

Sorry for any anoyance.

Loop&Roll

Yes thats correct, the thermal conductivity of aluminium is greater than magnezium... therefore better heat transfer and better cooling.

Scottmisfits

iTrader: (7)

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.

ezveedub

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.

bgbelden

iTrader: (8)

Can anyone tell me which engine is better overall and why ? Reg V-Spec or speed version?

ezveedub

iTrader: (17)

IMO, overall the Speed is better in the long run. Smoother power deliver and faster bottom end spool up for jumps. The DLC coated crank has almost no wear in most cases when time for a rebuild, as the stock V-Spec crank pin will most likely be oval.

bgbelden

iTrader: (8)

Thanks, now if i just knew what a crank pin was....

maximugen

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

bgbelden

iTrader: (8)

Thanks. Now i have a speed crank and reg OS conrod, can i put them in my OS and made it a "speed"?

ezveedub

iTrader: (17)

I believe you'll need the p/s set also. Just the crank may not yield the same performance. I believe the piston is differnent from the stock V-spec version. Also add the ceramic bearing.

imaxx21

iTrader: (1)

if you use a speed crank, you have to use a speed rod...