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Old 10-22-2000, 11:49 AM   #1
Scooby Newbie
Member#: 1634
Join Date: Jun 2000
Location: tx
Post H6 has no flywheel

The latest Sport Compact Car says the H6 has no flywheel, to shorten the length of the engine, and because it only comes with auto trans--they say the torque converter can be weighted to act like a flywheel.

Does any of this mean we'll never see an H6 with a manual trans?
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Old 10-22-2000, 02:23 PM   #2
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Member#: 524
Join Date: Nov 1999
Location: WA
04 STi


A H6 needs no balancing if all the rotating parts are near equal in mass.

Also I don't know of a single automatic car with a flywheel, as the torque converter does a great job doing what a flywheel is designed to do.

It will be interesting to see if Suabru changed the bolt pattern on the crank. They did this between the EA-82 motors and the EJ series. My thinking on this is that they did not want people mistakenly using a flywheel from one on the other, as the bellhousings are different widths, and doing so would create many problems. They also changed the tranny casings to prevent the EA-82 starter from being used.

My point is that the tranny may bolt up to the back of the motor, but subaru could have changed every thing else as they have done that exact thing in the past.
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Old 10-22-2000, 08:51 PM   #3
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2000 Impreza 2.5RS
Blue Ridge Pearl


I don't remember makes, but I've worked on several automatics that had flywheels... I've never actually seen one w/o, but I may have just not noticed... How do you engage the starter w/o a flywheel?
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Old 10-22-2000, 10:19 PM   #4
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2000 2.5 RS-T coupe
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hmm very interesting. Would this engine fit in an Impreza engine bay? If it does oooo (drool) who will have the first h-6 impreza coupe?
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Old 10-22-2000, 10:27 PM   #5

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I was wondering the same thing about the starter... I mean, why do you REALLY need a flywheel other then that? Just put a big crank pulley on there and leave it at that. Maybe the starter is on the timing belt?
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Old 10-22-2000, 10:39 PM   #6
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The starter ring is on the outside of the Torque converter.

With all that fluid moving you have alot of inerta, so much so I think it would be a HEAVY flywheel that would match it there, but then you still are missing the torque multiplication that automatics have off the line. Thats why Autos are great right off the line, but then like to bog a little way out.
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Old 10-23-2000, 12:59 AM   #7
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2008 SpecB


Guys, ColinL and I just had this out recently.
Autos usually have a thin steel flexplate bolted to the crank. The starter ring is welded onto it's circumference. If the engine is not internally balanced, there are balance weights fitted to the flexplate and the plate is indexed to the crank (so it has to be fitted in the same position). The torque converter is itself balanced (like a wheel), so there are weights on it too, but they have nothing to do with engine balance. The torque converter is bolted to the flexplate, and this is what provides the flywheel effect. Why is the flexplate there? It's not too smart to weld the starter ring to the TC. Chances are the TC will last a lot longer than the starter ring and it'd be a PITA to try welding a new one onto the TC. Second, the TC is heavy and quite long. It's easier to allow the plate to flex slightly if necessary to maintain the alignment of the converter snout into the pump than make the TC to such a close tolerance. That's why it's called a flexplate.

OK, enough torque from me on this.
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Old 10-23-2000, 01:52 AM   #8
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That is normal.

In that same article, they mention that the H6 and its tranny use 11 bolts and that they are compatible with the older 4 and 7 bolt trannies (except for leaving bolt holes unused).

To me that means the flywheel for an EJ series motor could be made to work, BUT you would have to be certain that the torque converter wasn't part of the crankshaft balance. If it was, you will have to rebalance everything with the new flywheel.

Anyway, yes it would be much easier if FHI just pulls their head out an offers a manual tranny with the H6. But there are ways of making it work if not.
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