Hyundai twin cam head conversion-update

sirius7 · Post by **sirius7** » Sun Oct 10, 2004 9:29 pm

Hi All,
I've been reading this forum for awhile now and have decided to join
so G'day. I have just blown my Starion engine (read broken ring lands)
When i stripped the motor down i noticed the cam bearings in the head
has flogged out and filled my head with metal past. Anyway I'm thinking
of swapping the head to a Hyundai 2ltr twincam head (looks like VR 4 head)as there is a whole motor sitting at my local wreckers. I know they use the same head gasket as i compared Starion to Sonata at work. I know the VR 4 head swap is possible but has any one used the Sonata head? I am already running after market ems.

Cheers
Dave.

mrb1 · Post by **mrb1** » Sun Oct 10, 2004 10:05 pm

I far an I know they will fit fine. Not sure about cam profiles to suit the turbo. You could check with someone like Wade cams about putting in a VR4 profile.

ProZac · Post by **ProZac** » Sun Oct 10, 2004 11:37 pm

Ive sat the DOHC head from an N/A galant on my block, seemed to line up fine. Should be the same head as the sonata. I wonder if the port sizes are comparable to a VR4's head tho? You'd be up for all the same work required when fitting the heard from a VR4's 4g63, which is quite a bit.

Do it tho :)

sirius7 · Post by **sirius7** » Mon Oct 11, 2004 12:09 am

Hi Prozac,
Yeah i was wondering about port size myself. The wrecker wants $500
for the whole motor, so I'll give it shot. I wonder if anything else will
swap over from the motor as it is low km.

Dave.

Shannon · Post by **Shannon** » Mon Oct 11, 2004 11:04 pm

here is one we prepared earlier.

http://www.geocities.com/bishiboys/EVO008.htm

the head and other engine parts where from a NA Galant. it is possible there where a few pieces which where fabricated, not everything bolts on.

decoy · Post by **decoy** » Tue Oct 12, 2004 2:11 am

:drool: it looks like it was just meant to be in the starion engine bay!

sirius7 · Post by **sirius7** » Tue Oct 12, 2004 9:05 pm

Yeah,
I'm going to pic up the motor tomorrow. :D
This what I've got planned.
Wolf ECU (got it)
Twin cam Hyundai head (getting it tomorrow)
VR 4 pistons (got some lined up)
To4b/To3 Garret (got it)(specs if you want them)
External waste gate (Home fab job)
Probably a couple of months before the car is back on the road.
I'm hoping maybe the cranks might be the same as mine has seen
better days.

Starion VR4 · Post by **Starion VR4** » Wed Oct 13, 2004 8:09 pm

Just to add fuel to the fire, you need to use the oil pump/timning cover, the oil pump on a VR4 etc is bigger to accomadte the hydraulic lifters and 2nd cam journal, from my measurements the vr4 pump is 30-40% more flow. Also two water holes at the front of head to block need to be drilled.

sirius7 · Post by **sirius7** » Wed Oct 13, 2004 9:11 pm

Thanks Starion VR4,
Thats the kind of info i am looking for. Hopefully having the complete motor should make things easier as I'll have both to compare.
Any other drilling or machining required?
I am thinking maybe i might take some digi pics of steps along the way
for others to look and see what this conversion takes.Might make a good
tech file.

Barney · Post by **Barney** » Wed Oct 13, 2004 9:21 pm

it may be worth replacing the valve stem seals with VR4 ones as they will handle the combustion heat better!

By the way, if you need a hand, just give me a yell :D

Good luck with the job

Ashly

sirius7 · Post by **sirius7** » Wed Oct 13, 2004 10:29 pm

Hi Ashley,
Thanks for the offer. Hey do you know Julian O'hara. He owns a
RX 7 grrowl. He sent some pics of a custom plenum of a Perth Staz?

Barney · Post by **Barney** » Wed Oct 13, 2004 11:20 pm

Yeah, I talk to him regulary at MC motorsport. It could be a picture of my plenum.

He also works opposite my work in Canningvale.

He was telling me how he just blew up the 12a.

ASHLY

sirius7 · Post by **sirius7** » Thu Oct 14, 2004 9:12 pm

I just rebuilt that bleeding Chicken cooking Rotary for him on the weekend
Took all day as you have to file all the side seals to get the correct clearence. The picture i have is your plenum them. :beer
Hope to see at a event soon.

Barney · Post by **Barney** » Fri Oct 15, 2004 10:38 am

Chicken cooker :D , i thought it was a keg :D

look forward to seeing you soon :beer

sirius7 · Post by **sirius7** » Sat Oct 16, 2004 12:22 am

Stripped the Hyundai engine tonight and dummied up the head
and timing cover on Staz block. All fits sweat. Cam belt on.Below is a list of early problems.
I have to drill two holes in front of block to allow coolant up to the head.
I have to use the water pump from the Hyundai donk (outlet faces back)
I have to use the Hyundai crank as the nose of the crank is longer to acc
omadate the wider timing gears. Looks like the crank will swap straight
over. It also feels lighter and has more balance marks on it.
Some pluss's i see already. The Hyundai head has huge intake ports
probably twice the size of the Staz head. The Hyundai main caps are
girdle type and swap straight onto the staz block.Good for high revs.
The Staz oil filter housing bolts straight onto the Hyundai timing cover.
If you want more info let me know as it seems to me early in the piece
that this is not a hard conversion. :D

Austarion

Hyundai twin cam head conversion-update

Hyundai twin cam head conversion-update

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