SKU: 68378583043

Massive Speed Crankshafts and Drive Gears

Sale price$134.46 Regular price$149.40
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Description

Massive Speed Crankshafts and Drive GearsOne fatal flaw of the Duratec MZR line since day one has been the complete lack of keys dowels locating devices on all of the cam timing components. While we're sure eliminating them made it far easier for robots to assemble the motors in production (and scared away shade tree mechanics from working on them), the possibility of slippage ensured disastrous results. The potential for slippage, while remote on a stone stock untouched grocery getter, was

One fatal flaw of the Duratec / MZR line since day one has been the complete lack of keys/dowels/locating devices on all of the cam timing components. While we're sure eliminating them made it far easier for robots to assemble the motors in production (and scared away shade tree mechanics from working on them), the possibility of slippage ensured disastrous results. The potential for slippage, while remote on a stone-stock-untouched-grocery-getter, was much more a threat on the modified, high RPM motors us folks like to build. 

Massive has stepped in and now offers a complete line up of keyed crank shafts and companion timing chain drive gears!!!

 

Cranks: 

We started with  NEW (high quality professionally remanufactured in the case of the 2.3 Ranger and 2.5 Dura - new from ford no longer available ) OEM crankshafts and added a proper key way to allow the timing chain drive gear to be positively locked to the crank in the event the crank pulley bolt should come loose. This will prevent COSTLY damage to your engine! Use with our keyed chain drive pulley.

2.0 Duratec - Factory FORGED Unit

2.3 Ecoboost - Factory FORGED Unit

2.3 Mazda DISI - Factory FORGED Unit

 

Gears: 

 

We started with A brand new Ford ? Mazda chain drive gear and EDM cut a proper keyway to allow the timing chain drive gear to be positively locked to the crank in the event the crank pulley bolt should come loose. This will prevent COSTLY damage to your engine! Use with our keyed crankshaft. Includes key.

We've always felt the cam gears don't need a key way or dowel - Allowing them to orbit whilst installing the timing chain is a must. Additionally, there is far less chance for slippage, reuse the now unnecessary diamond washers from the crank pulley on them if you please, run some loc-tite as well. 


Keyed gears and cranks are sold seperately

Modified IN HOUSE at Massive Speed's headquarters right here in the USA!!!

 

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
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SKU: 68378583043

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Holly
New York, US
★★★★★ 5
Good quality
Size: Large, Color: Golden Yellow
This was true to size and is a nice quality sweatshirt. It is soft but not buttery soft. It was a good value since my child wanted it for part of a Halloween costume. He has worn it again which makes the purchase even better
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Reviewed in the United States on April 9, 2026
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AmyVWatson
Natrona Heights, US
★★★★★ 4
Excellent quality, but difficult for dressing
Size: Small, Color: Light Brown
My son practically lives in these. The neck opening is a bit tight (hard to get over his head when dressing), but they're very warm and soft. Good quality fabric and nice colors.
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Reviewed in the United States on January 29, 2026
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Tee Mergs
Natrona Heights, US
★★★★★ 5
Love it, slim fit, a little tight pulling over the head.
Size: X-Small, Color: Golden Yellow
Overall, this is a really quality sweater. It’s very soft the materials on the thicker side. The color was beautiful. The body fit was perfect, but it was tight fit, pulling it on and off over the head. That being said my child is on the smaller size so it is more of a slim fit overall, I’d recommend sizing up! Other brands he wears a 4T shirt and we purchased an XS (will be getting a small in the future to compare)
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Reviewed in the United States on November 7, 2025
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Mel H.
Waukegan, US
★★★★★ 5
Quality item and super comfy.
Size: XX-Large, Color: Light Grey Heather
Got this for my son to take on a field trip in case it got lost it wasn’t one of his expensive ones. Oddly enough it’s so comfy it’s now his favorite hoodie and he wears it all the time and keeps it in his backpack. Holds up well to constant washing.
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Harper
Belleville, US
★★★★★ 5
WARM, not thin material
Size: Small, Color: Blue
Hoodie is comfy, warm and soft. Fits true to size, especially for a child who is a bit small for their age. Holds its' integrity in the wash. VERY happy with this purchase and will be buying more colors in the future.
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Reviewed in the United States on May 21, 2026

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