Hello everyone, new here to the forum and looking for information on the exterior dimensions of a 6G72 engine. The reason that I ask is that I'm looking for a compact engine for an old Indy car that I'm restoring. The original race engines are available, but too expensive and too high maintenance for this project. So I'm looking for a compact V configuration engine with these characteristics:
1) less than 21 inches long from rear block mounting face to the front of the pulleys
2) less than 24 inches wide at the outside of the heads
3) starter on the engine side of the flywheel
4) Small as possible diameter flywheel so engine can be mounted low in the chassis. Another website stated that 6G engines have a 282 mm outside diameter flywheel. Is that correct?
I'm planning a dry sump oiling system to reduce the height of the oil pan. So the only obvious problem to me right now are the water tubes coming off the back of the heads because they will interfere with the required bellhousing. How far do those pipes extend back relative to the rear mounting face of the block?
The Chevy emblem is on the rollhoop, the black X-brace is part of a spacer cradle made to take the place of the stressed engine, and the grey thing behind that is the bellhousing. You can just see the two silver rods coming into the picture which are temporary replacements for the coilover shocks.
The engine space is 22 inches long max from the bellhousing to the back of the tub. I figure I'll lose about an inch on the adapter plate and I want to leave a decent gap at the front behind the bulkhead so I have about 20 inches to work with for an engine.
Any constructive advice is appreciated, just don't expect any immediate progress, because I'm still in the planning phase.
Yes, I'm starting with the 3.0 l version because I understand that the larger displacement versions have a higher deck height block which would then make the engine wider and taller.
A post over on 3Si a guy sates that it's: "From the back of the block to the front of the crank pulley is 19 1/2". The width from the edge of each valvecover is 23". From the top of the valvecovers to the bottom of the pan is 24"
I would guess this is a 24V engine as most 3Si cars were and those are some WIDE heads!
OK, so the basic length is short enough and width seems OK. I'll try to get more detailed information on the three varieties of heads to see how much difference there is there.
I found a note on rockauto.com that verifies the 11.1 in (282 mm) diameter of the flywheel so that is good.
But I'm still worried about the protrusion of the water pipes out the back of the heads. More worrying still is that in many photos I've seen online, there are a lot of ignition components mounted to the back of the heads, maybe even the distributor on some variations. Is that correct? Does anyone know if those components can be relocated easily on a non-distributor engine?
Go to Club3G.com and they have a FSM for the Mitsu Cars. There's also a link somewhere there on upgrading the 3L. I just put a Fidanza flywheel in my Sebring but used a Mitsu clutch as the Mopar clutch will not bolt up to the flywheel. Odd quirks on my Mitsu stepchild. Go to oemmitsubishi.com for any OEM parts.
Some pics of my engine. Pardon the dust, all my time is going to my Rampage now...
Not sure exactly what 6G72 you're referring to, but the older Chrysler 12v doesn't have coolant lines coming off the heads. The water pump bolts onto the front of the block (I have pictures), and the coolant line that exits the rear of the engine is actually a crossover pipe that runs from the waterpump through the V of the block and exits through a valley in the bellhousing. This could be modified to use a flexible hose to avoid the bellhousing. The newer engines or Mitsu with the vertical intake may have different coolant ports in the manifold, but I still don't believe they have coolant ports on the backs of the heads.
EDIT: There is a coolant port on the the older intake manifold that comes out the rear of the intake manifold used for the heater core. It's a bolt on tube that can be modified to fit your needs as well. Added pic showing exit.
Guys, thanks for your efforts and the information on the other websites.
The coolant tubes that I'm worried about are the ones in the photo by the red arrow. This photo purports to be of a 6g72 out of a Montero. It looks to me like they take water out of the back of the block or heads and send it forward to the water pump.
But the other thing that caught my eye in this picture was the pocket by the green arrow that looks like it is for a rear mounted starter. I thought the starters were mounted on the block side on these engines. Are some one way and some the other? Or are they ambidextrous?
That engine is definitely not an early Chrysler 6g72... at least the EEK platform cars with the 3.0 (Shadow, Daytona, Lebaron, etc) had a front mounted starter - mounts to bellhousing, but is on the front of the engine, and the 12v SOHC heads do not have a coolant passage on the rear of the engine - only the front.
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