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Hyundai
1.6 "Alpha"

Hyundai's 1.6 DOHC Four delivers
good power from an efficient design

Automotive engine designs used to change about once every couple of decades. The small-block Chevrolet, for example, remained essentially unchanged for over thirty years, as did Ford's small V-8. And DaimlerChrysler's 5.9L product can trace its lineage to the B-engines of the '60's. That sort of longevity simply isn't possible in today's market, and with emissions, fuel efficiency and power all in demand simultaneously, ten years is too long for most engine designs, especially high-revving four cylinders. Hyundai is no exception, and their 1.6L four, offered in the Accent GSi, is an example of a modern powerplant spun off a basic design that's only five years old itself.

The 1.6 has its origins in the 1.5L "Alpha" engine used in the Accent since 1995, but although the design is similar, the newer engine produces significantly more power with reduced NVH (noise, vibration and harshness). The four-valve 1.6 generates 106 HP at 5800 RPM, and 107 ft./lbs. of torque at a useable 3000 RPM. Those numbers are up from 92 HP and 98 ft./lbs. of torque (at 4000 RPM). The extra 100cc of displacement comes from a change in bore and stroke from 75.5mm by 83.5mm to 76.5mm by 87mm. The block has been redesigned, and is deeply ribbed for rigidity, and the crankshaft features eight counterweights (four were previously used) for lower torsional vibration. On top, double overhead cams and a new 110-tooth timing belt, which is not interchangeable with pre-2000 Alpha engines, actuates sixteen valves. The compression ratio is 10-1, and that compression is contained by a cylinder head-block deck-mating surface that has been precision finished to a five-micron (peak to valley) roughness limit with a flatness of 0.03mm in the usual crossways check. The super smooth finish allows Hyundai to replace the multi-layer head gasket with a single layer type, requiring a switch in torquing procedure to the torque-angle method used in Hyundai's Beta engines.


HEAD BOLT TIGHTENING USES
THE TORQUE-ANGLE METHOD

Head service on the 1.6 Alpha now uses the torque angle method already approved for Hyundai's Beta engine series. First tighten the bolts in the order shown to 23-27 Nm (230-270 kg/cm or 17-20 lb.ft.) After all ten are done, start over again, and using a torque angle gauge, tighten an additional 60-62 degrees. Then go through all ten again following the same procedure and repeat the torque angle another 60-62 degrees.

The engine is dressed with new ancillaries that improve reliability and simplify service. The intake manifold, for example, is now a single piece design, reducing the chance of a vacuum or air leak, and the exhaust manifold features the catalytic converter MIG welded directly to the exhaust "flange". The design simplifies undercar exhaust piping and allows faster converter "light off" for a faster transition to closed loop operation. Note that there are two oxygen sensors, one before and one after the converter. The rear sensor is easily accessed from beneath the vehicle. On the intake side, the intake air system has been shortened and simplified, with the filter box now fastened with clips in place of bolts used previously. Ignition is by a dual-coil distributorless system that's up front and high-mounted for easy service.


Hyundai 1.6L "Alpha" Engine Specifications
Installed in: Accent GSi/GL
Type: 4-Cylinder Inline DOHC-16 Valve
Displacement: 1.6 L (1,599 cc)
Bore and Stroke: 76.5 x 87.0 mm
Compression Ratio: 10.0:1
Horsepower @ RPM (SAE Net): 106HP @ 5800 RPM
Torque (KG.M) @ RPM (SAE Net): 14.6 KG.M (107ft./lbs.) @ 3000 RPM

Electrical System
Battery: Maintenance-Free, 12 Volt-55 AMP
Alternator: 75 AMP
Ignition: Electronic, Distributorless


Several sensors are now clustered to reduce the number of vacuum lines and ease serviceability. The Idle Speed Control Actuator, for example, is now integral with the Throttle Position Sensor at the throttle body. Unlike the 1.5 12-valve-engine, the 1.6 has no Mass Air Flow sensor, (it uses a MAP only), with the Intake Air Temperature Sensor residing at the intake air box. A new, shorter intake air tubing run allows remote IATS sensor positioning with good fuel injection metering precision, and lower noise. On the injection side, the bypass fuel system has been replaced with a single-line (no return) 50psi design.

Hyundai's 1.6 Alpha isn't stuffed with variable valve timing, turbochargers or drive-by-wire electronics, but produces very good power and economy in a package that's drastically simplified when compared to similar engines of a decade ago. Modular design, fewer vacuum hoses and neat packaging make this engine perform well, and still remain easy to service.


<hr noshade width=60% size=1 align=left>"Hey, if my prize is your foot up my arse... its still a prize.... " - <b>WhoopOi</b>
 

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Thats my engine... Mwahahahahaha.... Simple and powerful (for an accent)


<hr width=60% noshade size=1 align=left><img src="http://jvx.itgo.com/untitled.jpg"></img>
1.6 DOHC 16v
5-speed
[email protected]
www.geocities.com/accentpage
"Ew Ei Ew Ah AH big bang.. wallawalla.. bing bang..
Ew Ei Ew ah ah Bing Bang wallawalla bing bang"
 

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sounds nice to me



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<b>KORE Crew #19</b>

"It's not the contest between racers that really matters, but the abstract dialogue between the soul of a racer and his machine." -Racer X
 

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<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>the bypass fuel system has been replaced with a single-line (no return) 50psi design<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>

ouch!

That makes life a little difficult when it comes to mods. Looks like the first mod to do is convert back to a standard setup & install a fuel return line (what a PITA!). Heck knows how they are regulating fuel pressure - an integral fuel pump/FPR perhaps, YUCK!

IMHO most of those 'features' sound good if you trying to save money when building a car...

I like the Oz spec (US 'GT' spec) motors ALOT better. 1.5L, DOHC 16V (not SOHC 16V) and produces ~same amount a horsepower. Oz spec are also MAP sensing. What I'd like to see is someone slap a DOHC head on the 1.6L with a set of quads...mmmmmm.


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there slower.. buy like half a second. (1.5 DOHC 16v)


<hr width=60% noshade size=1 align=left><img src="http://jvx.itgo.com/untitled.jpg"></img>
1.6 DOHC 16v
5-speed
[email protected]
www.geocities.com/accentpage
"Ew Ei Ew Ah AH big bang.. wallawalla.. bing bang..
Ew Ei Ew ah ah Bing Bang wallawalla bing bang"
 

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<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
there slower.. buy like half a second. (1.5 DOHC 16v)


<hr width=60% noshade size=1 align=left>http://jvx.itgo.com/untitled.jpg"></img>
1.6 DOHC 16v
5-speed
[email protected]
www.geocities.com/accentpage
"Ew Ei Ew Ah AH big bang.. wallawalla.. bing bang..
Ew Ei Ew ah ah Bing Bang wallawalla bing bang"

<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>
That's not true.<img src=/images/forums/snitz/oogle.gif width=15 height=15 border=0> I had a GT and it does 0-60 in 9.1 seconds just as carstats claimed. I raced my friends 95 Eclipse GS and were tied up to 60mph. Carstats gave the Eclipse 9.0 in the 0-60. So what your saying is the 1.6's can do 0-60 in 8.5 sec's?<img src=/images/forums/snitz/oogle.gif width=15 height=15 border=0> Doubt it.


<hr width=60% noshade size=1 align=left>2001 Hyundai Tiburon FX 5-Speed Cardinal Red <img src="http://www.plauder-smilies.de/devil/firedevil.gif">
Just bought it so there are no mods :)

Future mods:
Shortshifter
Cams
Ram Air Intake
Exhaust (headers->muffler)
BBTB -> IM
 

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Wanna send me the quads, i'll do it!<img src=/images/forums/snitz/cool.gif width=15 height=15 border=0><img src=/images/forums/snitz/wink.gif width=15 height=15 border=0> Sh!t, i'll probably need the standalone ecu anyways, and i believe the quads can be made to work with a turbo car.<img src=/images/forums/snitz/thumbup.gif width=25 height=18 border=0>


Damnit, you got me started again...<img src=/images/forums/snitz/guns.gif width=33 height=16 border=0>


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<b>KORE Crew #19</b>

"It's not the contest between racers that really matters, but the abstract dialogue between the soul of a racer and his machine." -Racer X
 

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And there` is no GT spec with the 1.6L DOHC. As for the returnless fuel system, couldn't one just borrow it from the aussie spec/old 'cents?


<hr width=60% noshade size=1 align=left><img src="http://www.freakygamers.com/smilies/s2/games/dbz/dragonball-piccilo2.gif">

<b>KORE Crew #19</b>

"It's not the contest between racers that really matters, but the abstract dialogue between the soul of a racer and his machine." -Racer X
 

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<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
<BLOCKQUOTE id=quote>quote:<hr height=1 noshade id=quote>
there slower.. buy like half a second. (1.5 DOHC 16v)


<hr width=60% noshade size=1 align=left>http://jvx.itgo.com/untitled.jpg"></img>
1.6 DOHC 16v
5-speed
[email protected]
www.geocities.com/accentpage
"Ew Ei Ew Ah AH big bang.. wallawalla.. bing bang..
Ew Ei Ew ah ah Bing Bang wallawalla bing bang"

<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>
That's not true.<img src=/images/forums/snitz/oogle.gif width=15 height=15 border=0> I had a GT and it does 0-60 in 9.1 seconds just as carstats claimed. I raced my friends 95 Eclipse GS and were tied up to 60mph. Carstats gave the Eclipse 9.0 in the 0-60. So what your saying is the 1.6's can do 0-60 in 8.5 sec's?<img src=/images/forums/snitz/oogle.gif width=15 height=15 border=0> Doubt it.


<hr width=60% noshade size=1 align=left>2001 Hyundai Tiburon FX 5-Speed Cardinal Red [img]http://www.plauder-smilies.de/devil/firedevil.gif">
Just bought it so there are no mods :)

Future mods:
Shortshifter
Cams
Ram Air Intake
Exhaust (headers->muffler)
BBTB -> IM
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote>


No.. that would be half a second in the 1/4 mile.. i have heard the GT runs a 17.5, i ran a 17.0... HALF A SECOND.. WHAO!.. and BTW the 1.6 accent runs to 60 in just under 9 secs.. 8.7-9.0.. now if my math is correct.. thats faster.


<hr width=60% noshade size=1 align=left><img src="http://jvx.itgo.com/untitled.jpg"></img>
1.6 DOHC 16v
5-speed
[email protected]
www.geocities.com/accentpage
"Ew Ei Ew Ah AH big bang.. wallawalla.. bing bang..
Ew Ei Ew ah ah Bing Bang wallawalla bing bang"
 

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The DOHC setup on the 1.6 Alpha and Beta series of motors is a serious PITA by all accounts. Cam gears? no sorry. Accurate exhaust cam timing? Not with a belt AND chain adding their slack together.

The classic DOHC setup of the GT & Oz spec X3 Excels is a far better setup. Vernier cam gears are easy to create and more importantly, easy to set. Also, the Oz spec DOHC is proven to respond well to QTB setup and there are cams available from HVE to suit that head.

Hyundai have defn made some improvements in the bottom end of the 1.6L. The extra capacity always helps. Im thinking about sourcing a 1.6L fully counterweighted crank for the 4G15 in my X2. I reckon RPW could pull almost 1.8L from it and with X1 flat-top pistons it would be a real goer (X1 pistons already have DOHC valve reliefs).


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Discussion Starter #11
So is there any option for a 1.6L block/1.5L head?


<hr width=60% noshade size=1 align=left>"Hey, if my prize is your foot up my arse... its still a prize.... " - <b>WhoopOi</b>

<a href="http://shop.hyundaiperformance.com">Shop.HyundaiPerformance.Com</a>, your one-stop shop for Hyundai performance parts (coming soon)
 

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Hey, Damit dude at Hyundai Performance. I like the changes that have been made to this website, but please get the damn store going.
Looking forward to it imensly.


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hmm, are the us spec 1.5L DOHC the same as the Aussie spec? I may just look for an old GT head to play with when I go junk hunting tomorrow...

<b>EDIT:</b> Nevermind, i went to webtech and found tht the heads are near identical in the states, so I won't waste my time.

I'd still take a set of quads tho. Please?
<hr width=60% noshade size=1 align=left>http://www.freakygamers.com/smilies/s2/games/dbz/dragonball-piccilo2.gif">

<b>KORE Crew #19</b>

"It's not the contest between racers that really matters, but the abstract dialogue between the soul of a racer and his machine." -Racer X
 

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you want quads? You cant handle the quads.

hehe, seriously if you want quads better make sure you have the $$$ to go with it.

RPW finished a QTB setup for a local DOHC X3 owner a few months back. The guy came back for the rest of the goodies before Xmas. ie a full bottom & top end buidlup to Stage 2/3 specs. Too bad the car is that nasty pink colour.<img src=/images/forums/snitz/eek.gif width=15 height=15 border=0>


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