Looking forward to your reseaches.


i'm still drooling over a 93 Dia Wagon 3.0 SOHC 12 valve.
Napa lists piston rings as the same . they list monty part # for pistons on the monty but not for the Dia.
Valves are all the same numbers.

Some of the power may be from sequencial injector on Dia and the All fire at once on the "89".

Just saw a 3.0 DOHC in a dia today. Maybe it is only the DOHC that has 10/1 and the aftermarket manals are misprinted mistakes. I've even found a couple mistakes in my factory manual.

Hi Frank,
I have most all the FSMs here in paper from 1971 to 2003, $1600 worth of them as well as a dozen factory CD manuals. They show the 3K and the Diamante having high compression and long cams and the trucks with low compression and short cams.
But other writings such as the CAPS contradict that. I have the latest CAPs being delivered today, that will not change the old info though.

Hi Frank,
I have most all the FSMs here in paper from 1971 to 2003, $1600 worth of them as well as a dozen factory CD manuals. They show the 3K and the Diamante having high compression and long cams and the trucks with low compression and short cams.
But other writings such as the CAPS contradict that. I have the latest CAPs being delivered today, that will not change the old info though.
We need to verify what is actually in the engines, my schedule just got messed up so I might have a few hours off that I can open up my old wagon motor.

Charlie,

I "think" the information is correct on the Diamante/3000GT/Stealth 24v DOHC engines - those have 10:1 CR and identical cams. Of course, the turbo engines have the 8:1 CR pistons, but I "think" the cams may still be the same.

Where I'm confused is the 12v SOHC specs. The information I've seen so far indicates that the 12v SOHC engines in the 300GT/Stealth are the same heads and cams as the Montero/Raider - 8.9 CR. But - as you have said - the Japanese built Diamante 12v SOHC sedan engines appear to have 10:1 CR with longer duration cams..... by my calculations, 262 duration for the Diamante compared to 258 duration on the 8.9 CR engines.... with the longer duration cams opening 3* later/closing 7* later.

I've found nothing to indicate specs on the Australian built Diamante station wagon. It may be the same as the sedan, but if you try a Hollander search, the indication is that the engines are not the same as the sedans..... my question is why? - and what's different?

I may end up going to Augusta Mitsubishi for nothing next week, but this is bugging the heck outta me. Inquiring minds want to know before putting anything into the blower engine bay. <img src="/forums/images/graemlins/confused.gif" alt="" />

Frank

Dont know if you have seen this guys page. ...a picture of the mythical factory supercharged
http://www.robskorner.org/faqs/othermotors/othermotors.html



"In 1987 Mitsubishi went a step further with the new 6G7x motor family and introduced a V6 engine varient of the 6G71 in a supercharged flavor. This motor found it's way into the Debonair V."


Also some words about LPG that were interesting

here's a 10:1 wagon, but no cam specs
http://specs.amayama.com/mitsubishi/diamante_wagon/1993_3/16823/




from this page:
http://specs.amayama.com/search/

from here:

http://specs.amayama.com/search/

Yup - I've seen the writeups on the blower version - but it's a 2.0L 6G71. Mine had better beat that one by a lot. <img src="/forums/images/graemlins/wink.gif" alt="" />

Frank

Justice, here's a fella on the Diamante forum who seems to know the answer with a fair amount of certainty:



A tale of interference engine woe

Frank

I guess that anwers that. No way for me to know if I really have that engine other than comparing the external differences that I've already noted. When I find a set of montero valve covers to switch over, I'll look at the cam codes and take a pic. I'm looking for a set of Montero valve covers. It would be nice to be able to put oil in the engine without a funnel <img src="/forums/images/graemlins/lol.gif" alt="" />

This shows the Galant and Sigma 6G72 versions to have the same cams as the Montero and other 8.9:1 CR heads:

web page

Note that it does not list cams for either the Diamante sedan or wagon - yet uses separate categories even though all info listed is the same for both - must be some difference in something somewhere.

Frank