Predator vs coyote build

[horsepower addiction]

When putting together a 5.2 predator block you can use a predator crankshaft or a coyote crankshaft but how does this effect the overall build.
do predator crankshafts require predator pistons?
If you use a coyote crankshaft which pistons should you use and what is the effect on compression?
What if you use predator crankshaft and coyote big bore pistons? Will the piston contact the head?
Or if you use a coyote crankshaft and predator pistons? Would the compression be low?

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[Timbuck]

Off the top of my head from my head from research for my build what way I was going to go.

There is no difference to stoke on either. The predator just has a bigger bore size, i think around 1mm.
with my coyote build I was going sleeved for boost. I stayed with stock coyote bore size so I can re-bore if I blow it up in the future. Mahle pistons and Callie’s rods.

pistons you use will have an impact on what compression ratio you end up with. And neither should contact the head/valves.

do you already have a predator block ??

 

[80FoxCoupe]

When putting together a 5.2 predator block you can use a predator crankshaft or a coyote crankshaft but how does this effect the overall build.

do predator crankshafts require predator pistons?

If you use a coyote crankshaft which pistons should you use and what is the effect on compression?

What if you use predator crankshaft and coyote big bore pistons? Will the piston contact the head?

Or if you use a coyote crankshaft and predator pistons? Would the compression be low?

When putting together a 5.2 predator block you can use a predator crankshaft or a coyote crankshaft but how does this effect the overall build.

do predator crankshafts require predator pistons? Using a predator crank requires specific rods and pistons. Rod has smaller diameter wrist pin and pistons has slightly shorter comp height vs coyote.

If you use a coyote crankshaft which pistons should you use and what is the effect on compression? You can run a coyote rotating assy in a predator block, simply use the piston diameter that matches the bore.

What if you use predator crankshaft and coyote big bore pistons? Will the piston contact the head? Larger bore has nothing to do with hitting the head. Big bore as in 3.700? Which is what the predator block is as standard.

Or if you use a coyote crankshaft and predator pistons? Would the compression be low? You would need a custom rod to do this. Run a CR calculator to answer your compression questions.

 

[80FoxCoupe]

Off the top of my head from my head from research for my build what way I was going to go.

There is no difference to stoke on either. The predator just has a bigger bore size, i think around 1mm.
with my coyote build I was going sleeved for boost. I stayed with stock coyote bore size so I can re-bore if I blow it up in the future. Mahle pistons and Callie’s rods.

pistons you use will have an impact on what compression ratio you end up with. And neither should contact the head/valves.

do you already have a predator block ??

5.2 cranks have slightly more stroke vs coyote. Google it for the exact numbers.

 

[80FoxCoupe]

All these dimensions are available online from ford performance and rod/piston manufacturers.

 

[horsepower addiction]

Coyote has 92.7mm stroke predator 93mm

 

[horsepower addiction]

I know it’s not much but that means that the piston is either taller or has the wrist pen in a different spot so like I said, if you put predator crankshaft and a coyote piston, would it be enough to hit the head?
Or if you run a coyote crankshaft with a predator piston is this gonna dramatically drop compression

 

[wingnutt]

https://rpgracingengines.com/

 

[80FoxCoupe]

I know it’s not much but that means that the piston is either taller or has the wrist pen in a different spot so like I said, if you put predator crankshaft and a coyote piston, would it be enough to hit the head?
Or if you run a coyote crankshaft with a predator piston is this gonna dramatically drop compression

Your asking questions I already answered.

 

[horsepower addiction]

When putting together a 5.2 predator block you can use a predator crankshaft or a coyote crankshaft but how does this effect the overall build.

do predator crankshafts require predator pistons? Using a predator crank requires specific rods and pistons. Rod has smaller diameter wrist pin and pistons has slightly shorter comp height vs coyote.

If you use a coyote crankshaft which pistons should you use and what is the effect on compression? You can run a coyote rotating assy in a predator block, simply use the piston diameter that matches the bore.

What if you use predator crankshaft and coyote big bore pistons? Will the piston contact the head? Larger bore has nothing to do with hitting the head. Big bore as in 3.700? Which is what the predator block is as standard.

Or if you use a coyote crankshaft and predator pistons? Would the compression be low? You would need a custom rod to do this. Run a CR calculator to answer your compression questions.

I have a predator crank coyote boostline rods and 3.7 coyote pistons 12:1 and predator block. Do I need to lock into some lower compression piston?

 

[engineermike]

What fuel and blower?

 

[80FoxCoupe]

I have a predator crank coyote boostline rods and 3.7 coyote pistons 12:1 and predator block. Do I need to lock into some lower compression piston?

I can't answer what compression you need. Ask your tuner. Post up part numbers for rods and pistons.

 

[horsepower addiction]

I can't answer what compression you need. Ask your tuner. Post up part numbers for rods and pistons.

Part numbers

 

[horsepower addiction]

What fuel and blower?

E85. Single turbo

 

[bauern]

I looked up your pistons with a 1.09" comp height as I remember the comp height of coyote pistons to be ~1.168". I'm not sure what Predator pistons stock are but the Voodoo is 1.161" for the increased stroke.
From DSS:
"323 Ford Coyote Direct INJ , FX, Comp Height: 1.09, +1cc Dome Top, PIN: .866", Full-Floating or Press Fit, Ring Groove: 1.5/1.5/3MM, Stroke: 3.750", ROD: 5.95, Approx Comp Ratio: 52cc-12.41, 57cc-11.49, 62cc-10.73"
It seems these are stroker pistons.
You need to do the math knowing the deck height, comp height, stroke and rod length.

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