Detailed Engine Specs

[gentau]

Does anyone have a link that provides engine specifications other than hp and tq? I would like detailed info such as bore, stroke, combustion chamber size, compression ratio, valve sizes, duration and lift of cams, etc., etc.

I know the block and cylinder heads are aluminum. I cannot find info on the crank, rods, and pistons. I would really like to know if they are cast or forged.

Info on any of the engines would be welcome; but I am especially interested in the Tau V8.

 

[Sal Collaziano]

Any information on this available yet?

 

[gentau]

Well, it has been almost four months since I made my original post in this thread. Delivery of the Tau V8 equipped car to the dealerships is imminent; and detailed information about the engine is apparently still not available.

Hyundai has already invited aftermarket manufacturers to look, measure, and fondle the Genesis Coupe with the V6 and the 4 cylinder; but they are remaining mysteriously mum about the internal configuration of the Tau. The auto rags normally dissect new engines and run feature articles on them well before introduction; but, to date, they have painted the Tau with a very broad brush. Most of the information published, so far, could have just as easily been gathered from a Hyundai brochure.

As a gear head, I understand that the average consumer isn't looking for the detailed information that I desire. However, anyone who has ever paid to have a timing belt replaced would probably like to know if the cams are belt or chain driven. If the engine has a timing belt, it would also be interesting to know if the valves are of interference or non-interference design in the event of a timing belt failure.

Please excuse the rant, fellas...but, I am getting a little antsy.

 

[gentau]

One of the questions has been answered. I found a picture with a cutaway view of the engine that was apparently made at one of the auto shows. It seems as if the Tau will have a timing belt, rather than a chain, to drive the camshafts. The picture pretty clearly shows that the drive gears on the camshafts are cut with cogs...not teeth. There was no write-up accompanying the picture, so it is still not clear if the engine is interference or non-interference design.

 

[jwaters943]

Yes, it uses a timing chain just like the Lambda V6. In fact I read that the Tau engine is loosely based on the Lambda V6, but of course I can't find the source now.

 

[BaywayRic]

Does anyone have a link that provides engine specifications other than hp and tq?

These files should get you started. See my other post on documentation to get more stuff.

 

[cabz]

Anyone able to determine yet if the valves are interference or non-interference?

 

[EdVoylesHyundai]

Anyone able to determine yet if the valves are interference or non-interference?

That "should" be a non-issue as Tau uses a timing chain, not a belt. If the chain comes apart inside the motor, you have more things to worry about than whether or not a piston touched a valve. That said, I would imagine that with the amount of power and technology contained in this motor, that it would be an interference motor, simply because they would need to hold valves open as long as possible and with as much lift as possible to produce this power. This is just me speculating.

 

[Simonwpb]

There is a Wikipedia page for the Tau engine as well as the Genesis

http://en.wikipedia.org/wiki/Hyundai_Tau_engine
http://en.wikipedia.org/wiki/Hyundai_Genesis

The Genesis page lists these specs for the Tau:

Further 4.6L Tau V8 specifications (projected):
* Configuration: Front-engine, rear-wheel drive sports sedan
* Track, f/r: 1575 mm / 62.0 inches, 1580 mm / 62.2 inches
* Tires: P235/50R18[7]
* Estimated horsepower: 375 hp (280 kW)
* Estimated torque: 333 ft·lbf (451 N·m)
* Displacement: 282.4 cid (4626.7 cc)
* Bore: 3.62 inches (92 mm).[8]
* Stroke: 3.42 inches (87 mm)[8]
* Compression ratio: 10.4:1[8]
* Specific output: 81.5 hp/L (1.34 hp/cid)[8]
* Block material: High pressure die casting aluminum block
* Cylinder head material: Aluminum
* Valvetrain: Dual Over Head Cam (DOHC)
* Valve timing: Continuous variable valve timing
* Variable induction system
* Fuel delivery: Multi-port fuel injection
* Recommended fuel: Premium Unleaded
* Stabilizer bar (front/rear): 26 mm (1.02 in)/18 mm (0.71 in)
* Weight distribution front to rear: 53:47
* Brakes: Power-assisted 4-wheel disc
* Front brake diameter (mm / in): 320 / 12.6 ventilated disc
* Rear brake diameter (mm / in): 314 / 12.4 solid disc
* Steering type: Speed-sensing rack-and-pinion
* Steering ratio: 14.86

Hyundai also lists the following specs:

4.6L V8

Type CVVT (Continuously Variable Valve Timing) DOHC 32-valve V8
Materials Aluminum block / aluminum cylinder heads
Displacement 4.6 liters (4,627 cc)
Horsepower 375 @ 6,500 rpm (Premium fuel)
368 @ 6,500 rpm (Regular fuel)
Torque 333 lb-ft @ 3,500 rpm (Premium fuel)
324 lb-ft @ 3,500 rpm (Regular fuel)
Bore & Stroke (mm) 92 x 87
Valves per cylinder 4
Compression ratio 10.4
Estimated 0-60 mph 5.7 seconds