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Discussion Starter #1
You need to start with a set of these...

<a href="http://www.hyundaiproject.com/pistons_pg1.htm">Click here, but 56K users beware -- BIG pictures ahead... </a>

Questions and comments welcome,
-Red-
 

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Discussion Starter #2
WTF???? Why is everyone's messageboard jacking up my link??? GRRR!!<img src=icon_smile_angry.gif border=0 align=middle>

Here, click on this:
http://www.hyundaiproject.com/pistons_pg1.htm
 

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hey read I fixed your link on the first post! try putting the link in ""
ex: ="link.htm">

Also how much did they run you? Who makes them??? I might want to see about me getting a set of those!

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<b>United We Stand</b>
 

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Discussion Starter #4
Hmm, usually the quotations marks don't bother the UBB boards, they just tack on extra "HTTP:" thingies because of the url UBB tag.

Well anyway...

Pistons are built by Ross Racing, they're 9:1 compression if dropped into a stock motor (well, a stock motor that's been overbored to fit them, they require a 0.020" overbore). I'll be shaving the head and deck for flame propogation and fuel atomization reasons, so the compression will end up being around 9.2 to 9.3:1 when I'm done.

Total cost including shipping was $509.04, which includes pistons, rings, pins and spiralocks.

-Red-
 

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Gidday Red,

I see you have got the head off your engine! I have been trying to find out the head diameter sizes of all the Hyundais but have found no one who can help me. All the manuals have the valve timing but no valve sizes. I like playing with numbers and have Dyno 2000 to play with. Here in Australia I read an article that stated the Turbo Coupe' had larger exhaust valves than the normal Excel (Accent)12 valve engine. At present that is the engine I have in my Excel (1996). Anyhow...can you give me the valve sizes of your 2 litre please...and any other engine you have on hand (Hyundai).

Thanks,

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Discussion Starter #6
No problem, in fact you're about the 3rd person who's asked me to measure the stock valve face sizes. Hyundai provides information on valve-seat size, but not actually valve face size.

Of all the tools I do have, I do NOT have a micrometer yet. No worries, I'll cruise over to the shop tomorrow and borrow the mic so I can get some measurements. I'll pull both the intake and exhaust valve face sizes for you.

I only have one spare BETA block, it's a G4GF (the 2.0L) first-run block. The head on this block has remained exactly the same until the new G4GD (newest 2.0L) block introduced to the US in the second half of the 2001 Elantra models (all Elantra GT's have the new head)

Thus, the measurements I can give you are only applicable to the G4GF head... I don't know if they have changed for the G4GD.

-Red-
 

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Discussion Starter #8
The dent in the one side of the piston is a valve relief. This is where the piston has a "cutout" so when it's coming up to the top of it's stroke and the intake valves are open, that the piston and the valves don't accidentally meet ;) The only reason there isn't a matching "dent" in the other side is because the exhaust valves sit high enough into the head, they cannot touch the piston when open.

The stock pistons have this too, although it's a smaller dent on the stockers: my valves are going to be closer to the piston top when the motor is done, so they made the valve relief deeper on these pistons.

That deeper pocket also serves to slightly reduce compression as well, but it's not a big deal.

Hey, about those valves! I took my valves into the shop and stole Dan's micrometer for a second, here's the face sizes:

Intake: 32mm
Exhaust: 27.5mm

-Red-
 

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<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
The dent in the one side of the piston is a valve relief. This is where the piston has a "cutout" so when it's coming up to the top of it's stroke and the intake valves are open, that the piston and the valves don't accidentally meet ;) The only reason there isn't a matching "dent" in the other side is because the exhaust valves sit high enough into the head, they cannot touch the piston when open.

The stock pistons have this too, although it's a smaller dent on the stockers: my valves are going to be closer to the piston top when the motor is done, so they made the valve relief deeper on these pistons.

That deeper pocket also serves to slightly reduce compression as well, but it's not a big deal.

Hey, about those valves! I took my valves into the shop and stole Dan's micrometer for a second, here's the face sizes:

Intake: 32mm
Exhaust: 27.5mm

-Red-
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=1 id=quote>

Thanks for that Red...now I can go and play with my Dyno 2000! I also have the 1500 16v engine valve diameters. Just need the 1800 and the 1500 12v sizes and I have them all...oh and maybe the 2000 from the Sonata, not counting the two V6 engines of course.

By the way you didn't steal his micrometer as he didn't catch you...you acquired it...but as you returned it you actually borrowed it eh.

Anyhow...thanks for your trouble...much appreciated!

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Gidday,
Since Red helped me out I have received another reply from America with all the valve head diameters of the other 4 cylinders. Therefore here are the particulars I have.
The following are the specifications of the Hyundai in Australia:

1500 12V:
Bore/Stroke…2.972 x 3.287
Compression Ratio.…10.0:1
Valve Timing…12-52/52-12
Valve Diameters.1.079/1.201
65kW @ 5500; 131Nm @ 3500.

1500 16V:
2.972 x 3.287
10.0:1
5-35/43-5
1.335/1.197
74kW @ 6000; 134Nm @ 4000.

1600 16V:
3.047 x 3.346
9.85:1
6-46/50-10
1.339/1.201

1800 16V:
3.228 x 3.346
10.0:1
6-46/50-10
1.339/1.201
94kW @ 6100; 161Nm @ 5000.

2000 16V (Scoupe):
3.228 x 3.681
10.3:1
8-40/50-10
1.339/1.201 102kW @ 6000; 180Nm @ 4800.

2000 16V (Sonata):
3.346 x 3.465
10.0:1

103kW @ 6000; 180Nm @ 4600.

Sonata V6:
3.307 x 2.953
10.0:1

127kW @ 6000; 230Nm @ 3750.



Grandeur XG V6:
3.587 x 2.992
10.0:1

141kW @ 6000; 260Nm @ 4000.

1500 12V Turbo (1992-5 Scoupe):
2.972 x 3.287
7.5:1
8-52/52-8
1.20/1.35 (guesstimate)
85kW @ 5500; 140Nm @ 4000.

Hope it is of some use to someone eh.


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Red!!!
Can Ross racing make drop in pistons instead of overbore like yours?
Now i do want Forged pistons but cant decide weather to get 1.8Litre or 2.0Litre Forged pistons.As you know my Tib is the 1.8Litre but not sure on which one to get.I can always get a 2.0Block at the scrap yard and get the 2.0Litre pistons.
Also im not sure on what compression ratio i should get.Since i have the Alpine Turbo kit what compression ratio piston should i get? Thanx Rob!!!!!!!
 

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Discussion Starter #12
Mokurai, glad to see you liked the info. I'm also glad you posted all those engine specs, it came in very handy for another discussion I was having on another forum.

Uniq...

Unfortunately no, the Ross pistons require an overbore because you have to be VERY exact about the cylinder size on these pistons and also the rings. Otherwise they may not seat right, which would lead to really fat wall clearanes which might cause problems (blowby, pressurized crankcase, burning oil, et al)

Still, I bet if you give Darius a call he might be able to work something out. I know you use the same bore as us 2.0L people, so the pistons should work for you too -- just need to bore your block.

I would suggest a set of 9:1 pistons for you, should be just fine for anything you want to do with an Alpine turbo. I'm betting you could run 15psi or more with these along with the Alpine setup.

Of course, you will not want to use the head spacer with these pistons, as the low compression part will already be taken care of :D

-Red-
 

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Soooooooo, if we call up Ross now and ask them for the pistons, they won't think we're crazy, right? <img src=icon_smile_big.gif border=0 align=middle>

Are there any part numbers or should we just tell them the Hyundai pistons?

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Discussion Starter #14
<BLOCKQUOTE id=quote><font size=1 face="Verdana, Arial, Helvetica" id=quote>quote:<hr height=1 noshade id=quote>
Soooooooo, if we call up Ross now and ask them for the pistons, they won't think we're crazy, right? <img src=icon_smile_big.gif border=0 align=middle>

Are there any part numbers or should we just tell them the Hyundai pistons?
<hr height=1 noshade id=quote></BLOCKQUOTE id=quote></font id=quote><font face="Verdana, Arial, Helvetica" size=1 id=quote>

Nope, call 'em up at (310) 536-0100 and ask for Darius (it's pronounced Der-I-us) and let him know that you've been talking with this one oddball guy from Albuquerque who's ranting and raving about his Hyundai Tiburon pistons <img src=icon_smile_big.gif border=0 align=middle>

He'll hook you up with a set in 2 weeks. Half down now, half due at delivery.

Also, I somehow screwed up on the price: The total price was $559.04, I was off by $50 because I thought I only paid $200 down. So the total price again is the $559.04...

-Red-
 

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Red!
Thank you very much for your reply:)
I was reading your post about JRP at the fxtreme board about pistons that Derek can get for Tiburons.How much was Derek asking for the pistons?
For now i might just run 10Psi with the Alpine Turbo on Stock internals for now until i have the money to purchase a Haltech because i remember you saying that after 10psi the S-AFC is useless and go with a Haltech.What do you think?
 
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