2.7 tiburon motor.

[Dr.shred]

s owait wait wait....... is this a bolt in mod?? are you saying the bolt paturns on the block to trans are identical?? this trans mates up to our blocks?

[92TurboTona]

Wondering if this transmission would hold up to a highly modded 2.5 with 250-300 hp

[Shadow24V]

Its a "possibility", the tibby 2.7 was derived from the mitsu 6G7x design.
Heres my 24v SOHC 3.0 (which mates to the A543) and heres a pic of the tibby's block bolt pattern. While it may bolt up to the block, there are additional concerns with clutch actuation, rear bobble strut, trans mount and axle splining which I have yet to answer




Additionally, I found more pics of the tibby's heads and timing system, and it LOOKS like their DOHC heads could work on the other motors, but I'd have to dig more into it and see if the bores are close enough. Not sure if they reduced the stroke to get to the 2.7L.

They use a single cam gear timing belt just like the 3.0 SOHCs, then drive the second cam with a chain in the head. I'd be interested to see what the heads flow as well. Must do more research!

[Dr.shred]

wow this is some good stuff!!!!!! a six speed would be awesome! even better those heads look like theyd work as well! more reaserch please!!!!!

[Shadow24V]

92TurboTona - from what I've read so far, the internals of the transmission are pretty much identical to the same era Nissan Sentra SE-R which I think had some different gear ratios on the 6sp. I also haven't (YET) seen anything with blown up transmissions even pushing 300+ HP on turbos or superchargers. However, IIRC the 2.2/2.5 chrysler motors don't have the same bolt pattern as the 6G7x motors and thus this trans wouldn't work on the Turbo Dodge I4's


Again, this would be more of an autocross or technical track usage compared to the long geared A543. You would be sacrificing overall top speed and fuel economy for a bit quicker acceleration.

EDIT: Also forgot, it looks like you would also need to switch over to the tiburon starter motor as well.

[phantomrt]

I recall back when I bought my Sonata with a bad 4 cyl engine, I researched the possibility of stuffing in a 2.7L in place of it, and I found the engines to be really cheap in price--about $300 for low mileage ones and plenty of them out there. Almost anytime you have low mileage $300 engines, they're usually pretty well engineered and don't have problems. I could easily buy an engine and transmission for quite a bit less than just the Hyundai / Kia 2.4L. Their 4 cylinders are also Mitsubishi engines, but their issue is snapping timing belts, which probably isn't much of a problem as long as you change them every 60,000 miles like the owners' manual says to.

And... on those pictures above, that isn't an aluminum block, is it? It looks like it. A 6G7x with an aluminum block?

I still think that it would be much cooler to go with the 3.8L MIVEC engine. It is almost another 100 horsepower over the Tiburon engine with over 1 liter more displacement and about the same amount of work to get it to happen. Downside is the cost of the 3.8 MIVEC.

And with the Chrysler 2.7L making over 30 horsepower more with the same displacement... it makes you wonder.

[Shadow24V]

I did more digging and it appears the tibby has an aluminum block. HOWEVER, it also appears that it is based more on the 6G73 2.5L block and is almost bored out to the max in stock form. Not enough meat to bore out to larger displacements like 3.0L and beyond.

While the 2.7 is an interesting motor, I'd be more interested in the heads and trans than the block. The heads might be a nice fit between the SOHC 12v/24v and the true DOHC heads on the 3000GTs etc.

EDIT: found some head flow #s as well (From NGM - House of Power)
Stock
I - 185cfm @ .400"
E - 150cfm @ .400"

Stage 4 porting from NGM with +1mm valves
I - 237cfm @ .400"
E - 212cfm @ .400"

[SOHCSports]

Quote:

Originally Posted by Shadow24V I did more digging and it appears the tibby has an aluminum block. HOWEVER, it also appears that it is based more on the 6G73 2.5L block and is almost bored out to the max in stock form. Not enough meat to bore out to larger displacements like 3.0L and beyond. While the 2.7 is an interesting motor, I'd be more interested in the heads and trans than the block. The heads might be a nice fit between the SOHC 12v/24v and the true DOHC heads on the 3000GTs etc. EDIT: found some head flow #s as well (From NGM - House of Power) Stock I - 185cfm @ .400" E - 150cfm @ .400" Stage 4 porting from NGM with +1mm valves I - 237cfm @ .400" E - 212cfm @ .400"

Interesting! I have always speculated that this block could have possibly derived from the 2.5 (6g73) as both of their displacements were so "small" for a V6. Even if the heads are too much hassle to make work in our cars (would rather stay 12V anyways) the trans would be more than worth the effort, not many are going to reach 195mph lol. I would gladly give up some top speed for even more accleration. Definitely keep this going, this is the freshest info for the 3.0 section in a long time.

[The Pope]

In regards to running 200 MPH with the Chrysler trans, I would try it unless a course cut Getrag trans. That 5th gear is basically a bolt on lol. I've snapped them off before... BTW LRE used to sell a .65 5th gear for the Getrag, would be nice if they still did.

[Shadow24V]

How did that 5th gear work? was it just the layshaft gear? When I rebuilt my A543, the input shaft was a single machined piece, no way to change the tooth count, pitch, or spacing...

[The Pope]

Quote:

Originally Posted by Shadow24V How did that 5th gear work? was it just the layshaft gear? When I rebuilt my A543, the input shaft was a single machined piece, no way to change the tooth count, pitch, or spacing...

well being a bolt on gear, not part of the trans as there based off a 4 speed. LRE just had a few ratios made. They either made 3 or 4 different ratios, the .65 is the one to get but if your running on different tracks and in 5th the whole time a quick gear swap helps you. LRE is the old Lambros racing company.

[The Pope]

actually comes up on the net as still being around, thought they were done?

[Shadow24V]

Pope - to your point, I looked at the FSM trans breakout and your right, 5th is a bolt on gear to BOTH shafts...must be my memory getting a few cobwebs... :)

[knightmoves]

Quote:

Originally Posted by Shadow24V Pope - to your point, I looked at the FSM trans breakout and your right, 5th is a bolt on gear to BOTH shafts...must be my memory getting a few cobwebs... :)

that is the first sign of old age!!!LMBO!!!

[Shadow24V]

Either that or too much time NOT working on the car...I should fix that :)