Stroker School please

[BigRis]

Can you guys school me on the stroker 4.6L ? I know the chevy thing. Drop a 400 crank in a 350ci sb chevy and you get a 383. I think it revs quicker more torque? I kind of know the basics. But when I had friends that did them they dropped them in older Camaros etc pre computer age.
So out of the 1980s to 2012 lol. What is the basics of the 4.6l stroker? The make up and advantages? basically why would I want to stroke my 4.6 and would you stay NA or stroke to SC? is a stroker something that has DD manners? Like i said years ago you could do whatever and drop it in a car but with todays high tech computer cars is tuning a issue? Thanks

 

[gil_t2]

No magic, You are just changing the C.I. of the motor. Depending on the motor you are working on determines what parts you need. You need a crankshaft and some times you need a different rod, some times a custom piston. With the 4.6 you need crank, rods and pistons, on a 5.4 you need crank and pistons, you can reuse the rods.

 

[BigRis]

No magic, You are just changing the C.I. of the motor. Depending on the motor you are working on determines what parts you need. You need a crankshaft and some times you need a different rod, some times a custom piston. With the 4.6 you need crank, rods and pistons, on a 5.4 you need crank and pistons, you can reuse the rods.

Now does the stroker rev quicker? lower or higher red line? more low end torque? It just seems that that stroking a motor made other changes than just ci. But like I said it was many years ago that I had been around.

 

[95ragtop]

It should give you more low end torque, but other things that will affect that can be if you change the comp ratio. I know of 2 sizes for stroker cranks 3.75" and 3.8", not 100%, but I think they use the same rods with different pistons. I have heard that strokers shouldn't be revved higher that a non-stroker due to some ratio of stroke to bore, could be bs though. As for revving faster I think that would depend on if you go with equipment that is lighter. If the weight is the about the same you probably wouldn't even notice.

 

[KonaGT]

With the induction system staying the same, and just adding a stroker it shouldn't rev any quicker unless your rotating assembly is lighter weight.

You will make power lower down in the RPM range and it should make more torque down low.

 

[gil_t2]

Now does the stroker rev quicker? lower or higher red line? more low end torque? It just seems that that stroking a motor made other changes than just ci. But like I said it was many years ago that I had been around.

Increasing the C.I. is the reason for the increase in torque. Also you gain
H.P. If all the other parts stay the same that is about all you gain. normally a smaller CI, and shorter stroke will rev faster, theres alot of other things that can affect it. so i am only commenting on just stroking the motor

 

[Ampire]

Can you guys school me on the stroker 4.6L ? I know the chevy thing. Drop a 400 crank in a 350ci sb chevy and you get a 383. I think it revs quicker more torque? I kind of know the basics. But when I had friends that did them they dropped them in older Camaros etc pre computer age.
So out of the 1980s to 2012 lol. What is the basics of the 4.6l stroker? The make up and advantages? basically why would I want to stroke my 4.6 and would you stay NA or stroke to SC? is a stroker something that has DD manners? Like i said years ago you could do whatever and drop it in a car but with todays high tech computer cars is tuning a issue? Thanks

Probably not worth it. A pushrod small block can go from a 351 (5.8) to a 427 (7.0) with a stroker kit but you can't get that kind of displacement bump from a modular motor because its a small displacement overhead cam v8. I think the typical stroker for a 4.6 mod motor is to a 5.0.

 

[weather man]

I decided to forge before I went F/I. Mainly just because I am a contrary kind of guy Anyway, the price at CHP was the same for stock displacement or stroker rotating assembly, so went stroker. Obviously some money to be saved if you decide to run the stock crank (which is very good) and just update rods and pistons. There are some 5.3 kits, but I never priced them out. Good luck man!

 

[Bullitt3478]

The mechanics are pretty basic. Shorter rod ,different crank,pulls the piston lower in the bore,increasing c.i's, not sure if the 4.6's need to have the block clearanced for the rods or not. Not sure exactly what your goal is with the stroker, but for the cost I would do a turbo, or sc with low boost. Cost will be about the same, and as long as you don't go big on the boost it will be as safe as it can be.if its in the budget, keep the displacement stock, get rods and pistons and turn up the boost.

 

[char259]

This is interesting reading. You see alot of vendors selling the stroker and not alot of press for just the forged stock setup.

 

[AnotherS197GT]

This is interesting reading. You see alot of vendors selling the stroker and not alot of press for just the forged stock setup.

If you're spending all that money going forged, why not pick up a little displacement at the same time?

 

[BigRis]

The mechanics are pretty basic. Shorter rod ,different crank,pulls the piston lower in the bore,increasing c.i's, not sure if the 4.6's need to have the block clearanced for the rods or not. Not sure exactly what your goal is with the stroker, but for the cost I would do a turbo, or sc with low boost. Cost will be about the same, and as long as you don't go big on the boost it will be as safe as it can be.if its in the budget, keep the displacement stock, get rods and pistons and turn up the boost.

I will probably go SC in the future and leave the bottom end stock unless some big cash comes my way. I asked about the stroker because I have read a few guyss considering it, So I just wondered what advantages you get and if it is worth doing . So what I get is if I was going into the bottom end I might as well do it . But dont just do it for the stroker upgrade itself.

 

[BruceH]

FWIW a stroker assembly can be put together for a fairly low price right now. $900 for a new 3.8" Kellog crank and new Manley 5.850" rods with main bearings from horsepower1. IIRC a set of Manley pistons with the correct compression height for that stroke go for $799 with rings from JDM. Brenspeed sells CP pistons that will work with a 3.8 stroke too.

You could have a forged rotating assembly that's made with very good components for around $1800. Balance should be right around $200-$250.

With all that said I've kept stock stroke. My reasoning is I think an undersquare motor just isn't right. There are examples of them working great (5.4) but I just can't see doing it. I'd go big bore before a stroker.

You can get a Big bore 5.0 block for $1200. Add rods, pistons, and bearings for another $1200 or so and have a 3.700" x 3.543" 302 using your stock crank. The machining costs will be the same for a stroker or big bore.

 

[JeremyH]

Good point about the bore bruce. Man if only they sold the that boss 302 block in aluminum... lol I could be at 302 vice 281 with my current rotating assembley, well aside from getting a larger piston.

 

[BruceH]

Good point about the bore bruce. Man if only they sold the that boss 302 block in aluminum... lol I could be at 302 vice 281 with my current rotating assembley, well aside from getting a larger piston.

They do but it's about $4k and called a cammer, lol.

Edit: Trying some copy and paste from fordracingparts.com

Hover over image to zoom
click to enlarge




5.0L ALUMINUM CYLINDER BLOCK - ROAD RACE APPLICATIONS
M-6010-T50*
Suggested Retail Price
$4,299.00

Sold in Units of:
Each (1)


tech notes

• The "Cammer" 5.0L block is the foundation of Ford Racing's road racing success. Competing in both Grand-Am's Daytona Prototype and the FIA GT class.
• Used in the FR500C Competition Mustangs
• Engineered and optimized to be the ideal road race modular block
• Race proven revised water jackets and between bore cross drilling for improved engine cooling.
• Designed for minimal weight while retaining strength and durability for naturally aspirated engine combinations
• Big bore 4.6L aluminum block with cast iron liners
• 94mm (3.70") cylinder bore size. Stock cylinder bore size 90.2mm (3.552")
• 227mm (8.9370") deck height (same as 4.6L)
• Produces 5.0L displacement when used with a 4.6L stock stroke crankshaft, stock length connecting rods and custom 94mm-diameter pistons.
• Cross bolted main bearing caps
• Requires water pump YR3Z-8501-AB/Motorcraft PW-402 long 87mm (3.425) pump or YW7Z-8501-BB/Motorcraft PW-409 short 65mm (2.559) pump.
• Same block that is used in the 5.0L "Cammer" crate engine.
• Replacement sleeve M-6055-B

 

[JeremyH]

Yeah I remeber that motor from awhile ago in the 2v days, never see anyone really try to use it probably due to the price, also I believe the casting is different from the boss 302, the later being stronger and dont believe they sell just the block, but the whole setup.

Edit, looks like they don't sell the the full cammer setup anymore, and just the block now, $4299 is steep for a block, arggg lol

 

[HellsBells]

My reasoning is I think an undersquare motor just isn't right. There are examples of them working great (5.4) but I just can't see doing it.

Could you elaborate on the undersquare motor thing? What would having a stroke much longer relative to the bore do?

 

[BruceH]

Could you elaborate on the undersquare motor thing? What would having a stroke much longer relative to the bore do?

Generally speaking an undersquare motor will make more torque but rev slower.

Given the choice I would rather have square or oversquare vs undersquare. It's probably a hidden resentment related to operating 2 cylinder John Deere tractors while growing up.

 

[HellsBells]

Generally speaking an undersquare motor will make more torque but rev slower.

Given the choice I would rather have square or oversquare vs undersquare. It's probably a hidden resentment related to operating 2 cylinder John Deere tractors while growing up.

lol at the John Deere anectdote.

Is it safe to assume most motors are designed to be square or close to square? I'm guessing tractors and trucks might prefer undersquare engines?

 

[908ssp]

I wouldn't stroke a 4.6l for any reason. Especially if I was SC. As is the piston speeds are too high the forces on the rods and pistons increase exponentially as the rpms go up and piston speeds increase. Longer stroke has higher piston speed at the same rpm motor to motor.