Help me understand the BRZ/FRS engine! - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

BRZnut · 12-14-2012, 04:09 PM

Have had a BRZ for 2 weeks and want to have a better understanding of this engine:

Other than the two injection systems and the boxer design, how is this engine new and different??

Also, I don't understand what the Cams do and why they keep throwing the CEL...can someone explain??

Opposed · 12-14-2012, 04:20 PM

Besides the duel injection, and high compression, and low center of gravity, there is nothing really new and advanced about this engine.

Cams have lobes on them, which are driven by a chain or belt (chain in this engine) connected to the crankshaft. The lobes push down onto the intake and exhaust valves which allows air and fuel in, and exhaust out. Our particular cams have variable timing. Meaning, the computer can adjust the timing on when they valves are opened for performance and efficiency reasons. They are controlled by oil pressure. Some cars have an oil pressure issue, or the varriable system gets stuck causeing the engine to run poorly and thus throwing a CEL. Again, this is just as simple as I can explain it. But here is a video of cams working if that helps...
[ame="http://www.youtube.com/watch?v=ry2nP7I315M"]Variable CAM Timing - YouTube[/ame]

2forme · 12-14-2012, 05:38 PM

Well the technologies used in the engine parts allow it to handle more power than a run of the mill motor. You should look at the crawford tear down.

BRZnut · 12-14-2012, 06:25 PM

Good stuff..thanks. Since the oil control CAM system in the BRZ/FRS is nothing new, wonder why there are having issue with it??

Rayme · 12-14-2012, 06:31 PM

Quote:

Originally Posted by BRZnut

Good stuff..thanks. Since the oil control CAM system in the BRZ/FRS is nothing new, wonder why there are having issue with it??

I think most of these issues were before the new ecu reflash/computer problem. Dealers were just replacing whatever was related to the CEL codes at that time..someone correct me if I'm wrong.

OrbitalEllipses · 12-14-2012, 06:38 PM

Quote:

Originally Posted by ottopilot

I think most of these issues were before the new ecu reflash/computer problem. Dealers were just replacing whatever was related to the CEL codes at that time..someone correct me if I'm wrong.

A TSB came out to replace cam gears and associated parts...it was quickly pulled for many reasons. One of those reasons was probably because dealers were popping engines due to improper installation.

BRZnut · 12-14-2012, 08:39 PM

Quote:

Originally Posted by ottopilot

I think most of these issues were before the new ecu reflash/computer problem. Dealers were just replacing whatever was related to the CEL codes at that time..someone correct me if I'm wrong.

no you are right..thats how its played out so far. But I've read that some think the ECU upgrade is just an attempt to cover over some sort of mechanical problem of the Cam system. Wonder what the real problem is and why.

Also wonder if the oil cam system could be change to the third type shown in the video above that is all electric if the ECU change does not fix the issue.

12-14-2012, 04:09 PM	#1
BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Help me understand the BRZ/FRS engine! Have had a BRZ for 2 weeks and want to have a better understanding of this engine: Other than the two injection systems and the boxer design, how is this engine new and different?? Also, I don't understand what the Cams do and why they keep throwing the CEL...can someone explain??

12-14-2012, 04:20 PM	#2
Opposed Senior Member Join Date: Jun 2012 Drives: 2013 Asphalt FR-S Location: Bloomington, MN Posts: 1,156 Thanks: 499 Thanked 447 Times in 294 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Besides the duel injection, and high compression, and low center of gravity, there is nothing really new and advanced about this engine. Cams have lobes on them, which are driven by a chain or belt (chain in this engine) connected to the crankshaft. The lobes push down onto the intake and exhaust valves which allows air and fuel in, and exhaust out. Our particular cams have variable timing. Meaning, the computer can adjust the timing on when they valves are opened for performance and efficiency reasons. They are controlled by oil pressure. Some cars have an oil pressure issue, or the varriable system gets stuck causeing the engine to run poorly and thus throwing a CEL. Again, this is just as simple as I can explain it. But here is a video of cams working if that helps... [ame="http://www.youtube.com/watch?v=ry2nP7I315M"]Variable CAM Timing - YouTube[/ame] __________________ Asphalt FR-S: EcuTek Visconti STG2 tune, MAPerformance turbo kit, MAPerformance 3" exhaust, Hotchkis springs, Mach-V 17x9 Awesomes. Build thread: http://www.ft86club.com/forums/showthread.php?t=30703

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12-14-2012, 06:25 PM	#4
BRZnut Senior Member Join Date: Oct 2012 Drives: BRZ DGM Limited Location: USA Posts: 1,237 Thanks: 5 Thanked 431 Times in 250 Posts Mentioned: 8 Post(s) Tagged: 0 Thread(s)	Good stuff..thanks. Since the oil control CAM system in the BRZ/FRS is nothing new, wonder why there are having issue with it??

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