Probably exactly what you said. Inertia ring probably is to get that low horsepower , heavy car, with way too high of gears moving. Post a pic
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| Who are the cast crank experts on flywheels? https://slantsix.org/forum/viewtopic.php?t=68499 |
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| Author: | hyper_pak [ Wed Jan 14, 2026 1:24 pm ] |
| Post subject: | Who are the cast crank experts on flywheels? |
I removed the flywheel from my 76 225 Dart Sport. There is a huge inertia ring cast into the back of the flywheel. 122 tooth flywheel with standard clutch pattern, around 10 inches. Starter teeth are pretty chewed up, so I was going to swap with a better wheel I have. What is the deal with the big ring flywheel? |
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| Author: | Dart270 [ Thu Jan 15, 2026 2:03 am ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
You used to be able to get just the starter ring and press on a new one. Not sure if they are still available. All cast cranks, AFAIK, are all neutral balance just like the forged ones, so flywheels interchange. Maybe they wanted to put extra mass on because the crank got lighter? I have an alum flywheel on my high RPM cast crank (ltwt 62 lb) motor and it feels great. You notice it won't drive off as smoothly as a heavy crank and 'wheel, but no biggie. Engine is smooth as silk, vibration-wise. Usually the 225 stock iron flywheels are around 20-22 lbs. I think I've seen 1-2 that were more like 28-30 lbs, but I'm not sure I'm remembering correctly. Maybe those were the big ones for 11" clutch. Aftermarket standard size aluminum flywheels are 10-12 lbs. Lou |
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| Author: | Greg Ondayko [ Thu Jan 15, 2026 9:25 am ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Hmm. Please post a picture of that stan, I have not seen one. Maybe Rick can offer some insight with all of those 80's trucks he has cared for over the years. |
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| Author: | Rick Covalt [ Thu Jan 15, 2026 12:48 pm ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Probably exactly what you said. Inertia ring probably is to get that low horsepower , heavy car, with way too high of gears moving. Post a pic
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| Author: | hyper_pak [ Thu Jan 15, 2026 2:44 pm ] | ||
| Post subject: | Re: Who are the cast crank experts on flywheels? | ||
Quote:
Probably exactly what you said. Inertia ring probably is to get that low horsepower , heavy car, with way too high of gears moving. Post a pic
Quote:
Probably exactly what you said. Inertia ring probably is to get that low horsepower , heavy car, with way too high of gears moving. Post a pic
Low Horsepower, maybe.....
Heavy Car, "It's a Lite" for crying out loud! High Gear, 1st is a 3.09 for crying out loud!
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| Author: | volaredon [ Thu Jan 15, 2026 4:01 pm ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Huh I have 2 flywheels off of 80s trucks with the/6 and neither one has that |
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| Author: | Greg Ondayko [ Thu Jan 15, 2026 4:56 pm ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
I have never seen one like that. Post the part # and let's see what SlantSixDan can teach us about the part! My 79 Aspen cast crank 3 speed had a regular flywheel. Your 2.76/ 2.71 with the 3.09 is still only an 8.52:1 / 8.37:1 ish gear depending on tire size. Cool parts to find about. |
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| Author: | Dart270 [ Thu Jan 15, 2026 5:41 pm ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Never seen one like that! Please post a weight when you get a chance. Lou |
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| Author: | Rick Covalt [ Fri Jan 16, 2026 5:42 am ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Quote: Heavy Car, "It's a Lite" for crying out loud!
I just make stuff up as I go Stan! High Gear, 1st is a 3.09 for crying out loud! They may have just had a bunch of forklift stuff laying around to get rid of!
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| Author: | hyper_pak [ Fri Jan 16, 2026 9:23 am ] | ||
| Post subject: | Re: Who are the cast crank experts on flywheels? | ||
28 Lbs 3878965 VS 23 Lbs. 122 Tooth Flywheel, no inertial ring. 2128290 Ring Cast Number.
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| Author: | Rick Covalt [ Fri Jan 16, 2026 9:45 am ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
It also looks like that ring would be pretty close to the back of the block. |
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| Author: | Greg Ondayko [ Fri Jan 16, 2026 9:51 am ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Thanks Stan! Greg |
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| Author: | hyper_pak [ Fri Jan 16, 2026 10:29 am ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Quote:
It also looks like that ring would be pretty close to the back of the block.
It was on the engine, so it fits.
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| Author: | Killer6 [ Fri Jan 16, 2026 11:39 pm ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
Quote: Quote:
It also looks like that ring would be pretty close to the back of the block.
It was on the engine, so it fits.
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| Author: | hyper_pak [ Sat Jan 17, 2026 7:08 am ] |
| Post subject: | Re: Who are the cast crank experts on flywheels? |
I just make stuff up as I go Stan! They may have just had a bunch of forklift stuff laying around to get rid of! [/quote] You make stuff up?!?!?! |
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