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6G72 V 6 GM auto trans option


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#1 Bill Hincher

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Posted 01 October 2010 - 10:48 PM

Mingo was the first to ask, sooooooooooooooooo  I went out and got a 6G72 engine and cut it up to see what it looked like inside and out
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  funny? when I was starting out working on cars I always thougt the engine block was a 'dumb' peice of iron, but there is a great deal to learn from cutting away the core and finding out its secrets before a build
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The GM auto trans plate overlaps the 6G72 v-6 bolt pattern  very nicely. because I can cast my adapters, I am not dictated to by a standard adapter plate thickness size, I can adjust to any thickness  I need
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I started to think about starter spacing and this will lend itself to the selection of flywheel size

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then I turned my attention to the coupler design, the first thing to do was to find all the critical demensions of the exiting crankshaft
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I cut up the crankshaft too >;o)
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I laid out a couple differnt size flywheels just to see what would interfer or what had a better fitmant so I could make the best choices during the design
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In the rough draft, the coupler is a no comprimise peice of hardware, there can be no failure at this piont, any comprimise in this unit will be made elsewhere in the design,   the thickness of this unit will dicate the thickness of the adapter plate
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I know, it aint a computer drawing, but I spend hours just drawing and erasing and drawing thicknesses, shaving 1mm here and adding  an angle there and keeping it strong and keeping it light and trying this and that , just hours of thought and frustration >;o) making a complex peice simple is what I enjoy doing

Edited by Bill Hincher, 19 May 2011 - 08:00 PM.

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#2 SuperSteve57

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Posted 01 October 2010 - 11:59 PM

this is awesome lol! i have always wanted to do this. :lol:

#3 Bag-O-Chips

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Posted 02 October 2010 - 02:01 AM

Bill, you're the missing link when it comes to franken-builds lol GREAT JOB man!!!

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#4 shorequest

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Posted 02 October 2010 - 07:33 AM

Any plans for a adapter for a manual trans in the future? Just wondering since ill hopefully be starting a 6g72 swap in a few months.
87 quest:(dads) nvj head, hks cam, s16g, .040 wisecos, 2.5 turbo back
87 quest:(mine) gathering parts for 6g72
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#5 Bill Hincher

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Posted 02 October 2010 - 08:27 AM

View Postshorequest, on 02 October 2010 - 07:33 AM, said:

Any plans for a adapter for a manual trans in the future? Just wondering since ill hopefully be starting a 6g72 swap in a few months.


    yeah, I will be building the manual set up, I just gotta find out what trans guys want
I can do the t 5 ford or the T 56 6 speed or even the R 154, but the R 154 is getting hard to find and the T 56 is expensive, the W 55 wouldnt hold the power, so i gotta look over the options and find the right gear ratio set up
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#6 Metric-man

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Posted 02 October 2010 - 10:43 AM

Can you cut up a DOHC head from the 6g72 and cast in another cylinder ???
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#7 Mingo1

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Posted 02 October 2010 - 12:11 PM

Wow this is great job Bill this is why I opted for you to do this.
6g72 swap in progress

#8 Bill Hincher

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Posted 02 October 2010 - 12:32 PM

View Poststarion_cult, on 02 October 2010 - 10:43 AM, said:

Can you cut up a DOHC head from the 6g72 and cast in another cylinder ???

   I can do anything, but it aint cost effective, I will probably cut a couple heads up just to explain the cooling system and change the outlet to the front of the engine
   but you know? even after I explain and work out the cooling systems, no body uses it  :rolleyes:
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#9 Metric-man

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Posted 02 October 2010 - 11:56 PM

View PostBill Hincher, on 02 October 2010 - 12:32 PM, said:

I can do anything, but it aint cost effective, I will probably cut a couple heads up just to explain the cooling system and change the outlet to the front of the engine
   but you know? even after I explain and work out the cooling systems, no body uses it  :rolleyes:

I've got a 91 I've rebuilt the bottom end they don't use a trans computer for that year but, the successive years they did ?
am I correct? it been awhile and I have to go back to my notes
I've collected everything for a swap the ECU and the harness, and I've had it for a while because other business took precedence.
it only had 34,000 miles on it it was a warranty replacement because of the rod bearings or and or the crank bearings,
The 91's also only used a cast crank and did not use double bolt mains but it used the girdle to re-enforce the crank mains.
I can swap in a forged crank and I hear I can get the mains drilled for double bolts but I don't think it is ultimately necessary.

The heads were and still are allot of work I haven't finished them I don't know if it was that year in-particular but there was a significant amount of casting flash that I removed .
I ported and blended them nicely but, I want to build them up and replace the lifters maybe even use adjustables but they're mega $$$
for my budget so new stock (not crappy ITM's) are expensive enough all 24 of them.

I'd use your info Bill, I haven't completely finished the heads and I still want to see if I can get them all flowing the same CFM's
not that I would go out to the shop and start working tomorrow but eventually I will finish them, couldn't beat it for 300.00
the valve spring compressor extension I'm using is originally for a vett engine, but I don't remember which one (or are they all the same ?)

And don't forget they still get some cross traffic from the 3Si/stealth site here, those guys would appreciate it I would think.
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#10 Bill Hincher

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Posted 03 October 2010 - 08:28 AM

View Poststarion_cult, on 02 October 2010 - 11:56 PM, said:

I've got a 91 I've rebuilt the bottom end they don't use a trans computer for that year but, the successive years they did ?
am I correct? it been awhile and I have to go back to my notes
I've collected everything for a swap the ECU and the harness, and I've had it for a while because other business took precedence.
it only had 34,000 miles on it it was a warranty replacement because of the rod bearings or and or the crank bearings,
The 91's also only used a cast crank and did not use double bolt mains but it used the girdle to re-enforce the crank mains.
I can swap in a forged crank and I hear I can get the mains drilled for double bolts but I don't think it is ultimately necessary.

The heads were and still are allot of work I haven't finished them I don't know if it was that year in-particular but there was a significant amount of casting flash that I removed .
I ported and blended them nicely but, I want to build them up and replace the lifters maybe even use adjustables but they're mega $$$
for my budget so new stock (not crappy ITM's) are expensive enough all 24 of them.

I'd use your info Bill, I haven't completely finished the heads and I still want to see if I can get them all flowing the same CFM's
not that I would go out to the shop and start working tomorrow but eventually I will finish them, couldn't beat it for 300.00
the valve spring compressor extension I'm using is originally for a vett engine, but I don't remember which one (or are they all the same ?)

And don't forget they still get some cross traffic from the 3Si/stealth site here, those guys would appreciate it I would think.

             How about I finish the adapter first? >;o)
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#11 Metric-man

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Posted 03 October 2010 - 01:51 PM

View PostBill Hincher, on 03 October 2010 - 08:28 AM, said:

How about I finish the adapter first? >;o)

OK, sorry

I'll gather my info so, as not to babel.

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#12 Bill Hincher

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Posted 20 November 2010 - 09:13 PM

there was a tredmendous amount of time and attention to detail in the 6G72 V-6 coupler, the bolt pattern is completely staggered individual locations,  I will be doing more as I develop the idea, the flywheel will need to be built for the coupler
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#13 Mingo1

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Posted 02 December 2010 - 09:57 PM

Great work just here waiting patiently.  But very excited
6g72 swap in progress

#14 Mingo1

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Posted 02 December 2010 - 09:57 PM

Great work just here waiting patiently.  But very excited
6g72 swap in progress

#15 Starquest_Shopper

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Posted 17 August 2013 - 06:07 PM

View PostBill Hincher, on 02 October 2010 - 08:27 AM, said:

yeah, I will be building the manual set up, I just gotta find out what trans guys want
I can do the t 5 ford or the T 56 6 speed or even the R 154, but the R 154 is getting hard to find and the T 56 is expensive, the W 55 wouldnt hold the power, so i gotta look over the options and find the right gear ratio set up

I was researching putting a Chrysler 2.7L V6 into a SQ and found this thread. Any other info on adapting a manual to the 6G72? The only ones I could find that *might* work were some manuals from the D-50/Montero.
1998 Dodge Durango R/T * 1995 Pontiac Trans Am LT4 Turbo * 1995 Corvette Coupe * 1991 Dodge Daytona CS  * 1975 Datsun 280Z LT1/T56 * Plus a few bikes now  
Tips to sell your SQ car here   Courtesy 89PalermoSHP: How to post pics on the SQ forum (and yes, this can be done from a phone with Photobucket mobile)
Whatever you do, DO NOT read the post(s) above before replying! It's always much nicer to post the same info twice or ask a question that was already answered.

#16 Bill Hincher

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Posted 18 August 2013 - 08:35 PM

everything from here got moved over to here  http://www.starquest...howtopic=119556 so you can see the complete housing build . the manual set up is on my list but the starter location remains the question mark, I have been building the K20a Honda GM auto set up and from what I have learned on that build will carry over to the future 6G72 series bellhousings
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