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Old 10-19-2014, 08:01 AM   #1
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Forged bottom end

Ok so I'm currently researching on what all is needed to do a basic bottom end job. Where all you built guys getting your rotating assembly from? I see supersix offers pistions but no rods or crank. MMR shows complete rotating assemblies but from what I read they might not have them instock. LPF said they will offer these services at a later date. What should one do, if wanting to build up their bottom end.

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Old 10-19-2014, 08:33 AM   #2
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You already have a forged bottom end (crank). You mean Pistons and rods is what your looking for?
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Old 10-19-2014, 08:49 AM   #3
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I may be wrong on this

I thought I read someplace that the 3.7 V6 already had Forged Rods and crank, It may or may not only would need pistons depending on what you are doing to it.
From the turbo 3.7's I have seen and read about they all seem to do nothing to the engine and have no problems at all.
The 10 second CFM 3.7 owner is not touching anything inside the engine until it blows. So far it has not blown up.

The 3.7 Ford engine is used in the Ford trucks and is built very sturdy to begin with.

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Old 10-19-2014, 09:35 AM   #4
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Ford 3.7 has a powder forged crank and rods. Pistions are not forged.

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Old 10-19-2014, 09:39 AM   #5
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I will run my car with a procharger but plan on forging the bottom end. While the crank and rods are powder forged if I'm opening the engine to change out the pistions I just as soon change out the rods and crank to a stronger forged type.

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Old 10-19-2014, 09:43 AM   #6
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Thanks A Lot

That is what I thought I had read more then once on these forums.

I know it is really a very sturdy engine and not only used in Ford trucks but a few Imported cars and trucks use this engine.

I know I really like my 3.7 Cyclone and had a few chances to get a V8 but turned it down every time. I like the MPG, Power, Insurance rate, MPG ( Oh I already said that) and I hope this engine will last at least 100,000 miles or more before it wears out.
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Old 10-19-2014, 09:51 AM   #7
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My overall plans are to run mid 11 1/4 I think that's fast enough for a daily driver I'm just concerned that the engine might not like being pushed that hard with boost for a long time. It would be nice to get 60k out of the stock engine with high boost.

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Old 10-19-2014, 12:02 PM   #8
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mid 11s will not be very demanding from the 3.7, nor will the amount of boost needed to get there from a procharger. Prochargers are nice to an engine in a sense that they don't make a lot of torque, I'd say a basic set up with around 450 whp 375 wtq is enough to get you into the 11s with proper tire and suspension and be fine on the stock motor.


You're talking about adding thousands of dollars to a build that just aren't necessary to mid 11s.
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Old 10-19-2014, 12:24 PM   #9
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It's definitely not necessary to build the bottom end for a mid 11s 1/4 run but for overall durability and longevity I would feel more comfortable with it built. Plus who knows I might decide to up the boost and run a d1 head unit down the road.

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Old 10-23-2014, 06:57 PM   #10
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I believe The 3.7 has the same bottom end as the 3.5 ecoboost in the f150 since they are basically the same engine, in the f150 that engine is making 365 hp and 420 tq . The 3.7 is just a bored out 3.5

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