4g61t.org

what is the difference if any in the internal design of the intake upper and lower on the hyundai and mitsubishi 4g15 ?

_________________
THERE IS NO SUCH THING AS THE IMPOSSIBLE

I think the early 8V is all the same 2 piece design. the 90+(?) 12V use a 1 piece manifold with oblong ports & since the distributor location changed the flange is different in that area.

I just pulled mine off the other evening and I found it interesting how the PCV delivers to all 4 intake runners through little passageways cut into the flange at the upper/lower mating surface. but I digress...

something I had been thinking of - the 1.8 SOHC uses a 2 piece manifold as well. the lower portion is totally different as the head ports are spaced differently, but the upper half looks the same but with the larger TB opening & bolt pattern. check out the plenum gasket for the 1.8L:


that looks exactly the same as my Excel gasket including the extra hole for the EGR return port but minus the hole for the 8mm stud center-back. I'm thinking perhaps the 1.8 upper will bolt onto the Excel/CSM 8V lower & allow for mounting the larger 1.8 TB.

there must be someone here who has seen both manifolds that can either confirm or deny this possibility.

_________________
91 Hyundai Excel GS - stepbrother to the CSM
88 Piazza Turbo - Italian-Japanese fusion
88 Isuzu Trooper - 4x4 fun!

Interesting idea! Let us know if it works, there are a lot of 8-valvers here who would die for a good mod!

_________________
http://members.cardomain.com/socrateez
04' Olds Alero
91' Colt GL hatchback
4g15 12valve 5spd.
4g37 TB, MAF & Injectors. 4g37 ECU
Ported & polished & custom CAI w/K&N filter
5* Cam retard, 7*Ignition advance
2-1/4" catback w/flowmaster muffler
89 GT brake and suspension swap
Lots of little s#@t

hmm 90 Sonatas use a 2 peice intake mani. I wonder if you cpuld put the much more open sontat top on a 4g15 bottom...

Something to try.

I'm tempted to go to a parts store with my Excel gasket to try & compare directly with the 1.8, 2.0 or 2.4 single cam gaskets.

the pic I posted is a Beck/Arnley plenum gasket. if anyone has access to a good listing of their stuff you can cross-reference #'s to the 2.0 & 2.4. aside from where I got the pic, I could not find anywhere else that listed the plenum gasket alone for the other apps.

I have a similar upgrade for my Isuzu motor which gave me the idea a while back:
http://www.4g61t.org/phpBB2/viewtopic.php?t=7910

after pulling my Excel apart the other day, I was pretty shocked to see just how tiny the TB opening really is. I have no real goals of making any power with this motor - it is what it is - but I welcome cheap scavenged upgrades and looking at that tiny thing rekindled the thought.

checking car-part.com, an upper half & TB will run $50 or so + shipping.

_________________
91 Hyundai Excel GS - stepbrother to the CSM
88 Piazza Turbo - Italian-Japanese fusion
88 Isuzu Trooper - 4x4 fun!

THE SURGE TANK ON THE EXCEL IS RATHER LARGE HOWEVER THE TB PORT IS MICRO ITTY BITTY .
I THINK I AM GOING TO TRY THIS JUST AS SOON AS THE GASKET COMPARISON IS MADE . I HAVE alot of these manifolds in my area
did the eclipse have a baseline motor .... the 4g37 ? i may be mistaken
but i have seen goodies on those i want

_________________
THERE IS NO SUCH THING AS THE IMPOSSIBLE

i hope this works....coz then im going junkyard hunting

_________________
I own a CSM.
I live my life 1 repair at a time.
Nothing matters...not my crew...my bills, nor my friends drama...
For those 10 months or less... I'm broke...