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Old 02-26-2014, 01:21 PM   #1
Conflicted Chaos
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Massive underdrive pulley, which size belt do I need??

Wondering if anyone has installed the Massive Underdrive water pump pulley for the Duratec 2.0 engine. My friend was getting ready to put it on when he said that I needed a bigger belt. If anyone has installed this UDP and can remember the size of the belt needed please let me know.


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Old 02-26-2014, 02:56 PM   #2
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Also is there any significant difference in performance?
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Old 02-26-2014, 03:09 PM   #3
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I say go for it, looks the pulley is the same size as the stock water pump so you should not need a different size belt. Looks like I might get one as well, while it won't be a huge gain I will take less weight where possible and they are not expensive. I would not run a lightweight crank pulley though, they are not keyed and there is too much risk screwing up the timing. Install it and let us know how it feels.
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Old 02-26-2014, 03:27 PM   #4
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Thanks yellow hatch I will definitely let you know how it works out. Its a quality piece for 1/3 of the price of the CFM kit. Got one here on the marketplace brand new for $45.
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Old 02-26-2014, 03:30 PM   #5
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Thanks yellow hatch I will definitely let you know how it works out. Its a quality piece for 1/3 of the price of the CFM kit. Got one here on the marketplace brand new for $45.
Lucky! I am getting my water pump pulley from ebay for 74 bux. About to order it now so that makes two of us installing one. I don't care what others say about it for the price I will take my 1hp with a smile, they also mentioned that the stock water pump pulley isn't doing much at high rpm and causes cavitation (I just got off the phone with Massive) so a cooler running engine during track days are a plus for me. It's not like I am paying the price of a light weight crank pulley no running the risks. Have fun with it!
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Old 02-26-2014, 04:17 PM   #6
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I haven't read anything negative yet regarding this pulley. I'll be in touch for sure. Should be installed by this time next week. Thanks for your input!
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Old 02-27-2014, 07:33 AM   #7
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Quote:
Originally Posted by yellowhatch View Post
I say go for it, looks the pulley is the same size as the stock water pump so you should not need a different size belt. Looks like I might get one as well, while it won't be a huge gain I will take less weight where possible and they are not expensive. I would not run a lightweight crank pulley though, they are not keyed and there is too much risk screwing up the timing. Install it and let us know how it feels.
Yea, the crank isn't keyed but its easy to install cfm's pullley kit. You use the stock belt too. Does make a difference & I have no issues at all. I've had mine on for yrs.
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Old 02-27-2014, 07:43 AM   #8
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So you guys are saying no need for a larger belt? My buddy was convinced that it needed changed. He does a lot of work on Fords. I'll let him know then thanks guys.
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Old 02-27-2014, 10:37 AM   #9
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There a total waste of time and they add NO performance and like stated above you do take a risk on the duratec of moving the cam timing

They just are not worth the .3 to 1hp they might add , spend your money and time on something that does help

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Old 02-27-2014, 02:20 PM   #10
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Quote:
Originally Posted by Conflicted Chaos View Post
So you guys are saying no need for a larger belt? My buddy was convinced that it needed changed. He does a lot of work on Fords. I'll let him know then thanks guys.
No need for a larger belt for water pump pulley. But yeah definitely stay away from the crank pulley, stock one is fairly light. The water pump pulley imo is justifiable because the price is way cheaper and is safe to do as you are not messing with timing. Reducing cavitation @ high rpm and a few pounds off safely are a plus to me.
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