HKS New Stroker Kit and Evasive Motorsports Engine Build 2014 UPDATE 9/9/14

[Fear]

is this kit ever going to be released?

[Levi]

Let us see who will be first, HKS or Cosworth with Stage 3.

[Jason@DSG]

Originally Posted by mid_life_crisis

I haven't looked at any of those links yet as I don't have time right now, but let's face it, the formulae we've been discussing aren't total displacement, they're the change in displacement from TDC to BDC. Total displacement should probably include the combustion chamber area above the piston. It's probably minimal, but it counts.

It's completely negligible, you measure engine displacement with those formula's. I primarily work with 4B11 2.0L engines so I'm used to figuring out 2.0L range displacement. The stroker kit isn't adding very much, bottom line. It requires running 87mm pistons (I wouldn't go bigger than 87mm to avoid balance issues at high RPM long term -- which means sleeving) to get any displacement over 2.1L (2.15L to be exact with HKS stroker crank and 87mm pistons)

Like I said all along (you can look back to much older posts) a stroker kit on this car is not worth the effort. In the EvoX world, there's cranks that go up to 98mm stroke from 86mm OEM.

The best way to make power on this car is forged internals and a turbo rather than trying to squeak out every 1whp you can get NA IMO

[industrial]

Originally Posted by Jason@DSG

It's completely negligible, you measure engine displacement with those formula's. I primarily work with 4B11 2.0L engines so I'm used to figuring out 2.0L range displacement. The stroker kit isn't adding very much, bottom line. It requires running 87mm pistons (I wouldn't go bigger than 87mm to avoid balance issues at high RPM long term -- which means sleeving) to get any displacement over 2.1L (2.15L to be exact with HKS stroker crank and 87mm pistons)

Like I said all along (you can look back to much older posts) a stroker kit on this car is not worth the effort. In the EvoX world, there's cranks that go up to 98mm stroke from 86mm OEM.

The best way to make power on this car is forged internals and a turbo rather than trying to squeak out every 1whp you can get NA IMO

Since it seems like you know so much about this motor... What is the big restriction up top? Why does power dive off past 6700-7000rpm? How can we mitigate it? If we can hold the torque steady to 8500rpm that would be a sizable increase in power. I keep hearing that cams aren't worthwhile on this motor so there must be some other reason why power falls off. Are the heads just not flowing enough? Intake manifold tuned wrong? Does anyone know?

[Fear]

Originally Posted by Levi

Let us see who will be first, HKS or Cosworth with Stage 3.

My guess is cosworth will stamp thier name on the hks parts like they did with nAmeless

[s2d4]

Originally Posted by Fear

My guess is cosworth will stamp thier name on the hks parts like they did with nAmeless

I see a Toyota badge but all the parts on the car is Subaru.

[Fear]

Originally Posted by s2d4

I see a Toyota badge but all the parts on the car is Subaru.

rear end is subaru?
transmission is subaru?

yup, take your dik skinners off the keyboard and step away...

[DeliciousTuning]

Originally Posted by Fear

rear end is subaru?
transmission is subaru?

yup, take your dik skinners off the keyboard and step away...

If we wanna get technical, it's all Toyota since they own a majority share in Subaru's parent company

[cdrazic93]

Originally Posted by industrial

Since it seems like you know so much about this motor... What is the big restriction up top? Why does power dive off past 6700-7000rpm? How can we mitigate it? If we can hold the torque steady to 8500rpm that would be a sizable increase in power. I keep hearing that cams aren't worthwhile on this motor so there must be some other reason why power falls off. Are the heads just not flowing enough? Intake manifold tuned wrong? Does anyone know?

The cams aren't worth while on this motor simply because there literally is not much room for bigger cams.

I want to go ahead and say its head work that isn't flowing at peak efficiency when the RPM's are that high. It would make logical sense that they want you to rev the motor out since its a sports car, but not take it to redline (for the life expectancy of the motor), hence the choice in the x amount of flow through the heads.

I bet if you had some headwork done, then it would hold strong probably to 9k rpm. Not to say that would be safe and reliable for the motor, but it would hold the power (I'm just speculating).

[s2d4]

Originally Posted by Fear

rear end is subaru?
transmission is subaru?

yup, take your dik skinners off the keyboard and step away...

Exactly my point, companies use parts from other companies and sell it as a package and make money on it, not exactly rocket science but will have beaten the stupid.
Is that FAER?

[industrial]

Originally Posted by cdrazic93

The cams aren't worth while on this motor simply because there literally is not much room for bigger cams.

I want to go ahead and say its head work that isn't flowing at peak efficiency when the RPM's are that high. It would make logical sense that they want you to rev the motor out since its a sports car, but not take it to redline (for the life expectancy of the motor), hence the choice in the x amount of flow through the heads.

I bet if you had some headwork done, then it would hold strong probably to 9k rpm. Not to say that would be safe and reliable for the motor, but it would hold the power (I'm just speculating).

I've heard mention of heads a few times. I think Phil at element said something similar to what you're saying. I wish I had the will and funds to just tinker with this car at this level. Guess I have to keep waiting for the big boys to keep doing research.

[charged86]

Originally Posted by gabeg86

This looks like a million dollars in parts...

999,870.25 on sale

I can say i just had my heads done. The machinist noted that clearances are very close and setting cam lash is not for the faint of heart.

[Evasive Motorsports]

6/15/14 UPDATE

Two more weeks till Pikes Peak, we have just finished the shims for the cams. HKS 2.1L stroker with cams and Ferrea valvetrain for the Evasive Pikes Peak FRS. We need all the torque we can get for the climb!

[Levi]

Originally Posted by Jason@DSG

It's completely negligible, you measure engine displacement with those formula's. I primarily work with 4B11 2.0L engines so I'm used to figuring out 2.0L range displacement. The stroker kit isn't adding very much, bottom line. It requires running 87mm pistons (I wouldn't go bigger than 87mm to avoid balance issues at high RPM long term -- which means sleeving) to get any displacement over 2.1L (2.15L to be exact with HKS stroker crank and 87mm pistons)

Like I said all along (you can look back to much older posts) a stroker kit on this car is not worth the effort. In the EvoX world, there's cranks that go up to 98mm stroke from 86mm OEM.

The best way to make power on this car is forged internals and a turbo rather than trying to squeak out every 1whp you can get NA IMO

Adding a turbo adds lag, especially on aftermarket turbos, which are bigger.