As some of your might remember Martin has been talking about this wild new engine package he has been testing. Well the time is here and she is ready to GO!

After much R&D and having custom parts made the real deal is here. I'll disclose exact details soon but here are the basics.

AMS 23RR (road racing) Engine Program
Displacement: 2.3L
Compression: 9.0:1 9.5:1 10:1 available
Crank: Custom stroke forged Cr-Mo
Rods: Custom length forged
Pistons: Custom forged lightweight racing design - 20% lighter than our previous pistons!
RPM limit Drag/Street: 9100 RPM
RPM limit Road Racing/Endurance: 8500RPM


We have optimized the internal engine dimensions to create a great race engine. Originally we designed it for Road Racing applications, specifically for our Time Attack car. The goal was to broaden the powerband by extending the RPM limits and making more torque down low. Basically to have the low end grunt and spool up of a 100mm 2.3 stroker with the top end power and rev range of a 2.0L

Piston speed is a major factor in determining the EVO's RPM limit. Piston weight and rod ratio also affect RPM limits. By just looking at piston speeds, this engine can safely rev 450-550rpm higher than a 100mm 2.3 stroker. I've rated this engine based on Piston Speed alone but for reference, the better rod ratio and lighter pistons will account for another 200-300rpm higher potential.

Here are some dyno sheets comparing the engine:

Basic car stats (Martins white EVO VIII):

EVO 8
AMS GT30R turbo kit
93oct pump gas
GSC 280 cams
Stock intake manifold
AMS FMIC
AMS Turbo back exhaust
AEM EMS
780cc inj
Walbro 255lph
stock throttle body & stock upper intercooler pipe
Stock BOV
MBC

Here is a graph showing a direct before and after test of the engine. The new engine also includes a cleaned up head. Boost is 21psi dropping to 19psi and timing was 1-2 degrees lower on the new engine combo. Besides pulling 1-2 deg of timing out, I had to add about 10% fuel across the whole RPM range.



For reference, here is Martin's car when it was stock. Notice that spool up is like stock.
Again 93 octane at 21psi dropping to 19psi.



It's a big project and we finally got everything squared away. Testing was done and the horsepower gains and powerband are spectacular. This is a premium engine package and the price reflects many custom parts. The custom billet rods use expensive ARP 625+ custom age bolts that are much stronger than anything else available. The piston have been designed for strength and light weight, reducing stress on the wrist pin and rods. All these things add to to reduced fatigue and increased RPM range. My ideas was to create an engine that has the RPM range of a 2.0L while giving more torque and breather better at high RPM's. The Rod ratio, rod length, and bore to stroke ratio are optimized to support high volumetric efficiency. RPM range is extended by 500-600 rpm over a 2.3L stroker, making street/strip use good to 8900 RPM and road racing up to 8400 RPM.

For comparison, our 2.3L stroker made 550whp at 25psi of boost on a GT35R. After installing a 2.3RR 10:1 and changing nothing else we made 550whp at only 21psi!! There are a few choices as far as compression ratio goes and I'll discuss that here.

We're stocking two different compression ratio's and also can offer custom ratio's depending on applications.

9.25:1 Good for most street and race applications. Can be tuned to make great power on pump gas & race gas.

10.0:1 Great power and response on race gas for track or strip. Can be run on pump gas with caution and only on 93 octane (not 91).




Displacement: 2.27 L
Custom Billet Crank
Custom Billet rods with ARP 625+ Custom Age rod bolts
AMS Prepped 2.3RR block
O-ring deck
AMS spec Ross pistons
ARP Main & head studs
Custom Headgasket (will only work on this engine)
New Mitsubishi oil pump
New Mitsubishi water pump
AMS race balance shaft
Short block complete assembled & rotating assembly balanced

$7995

We are all very excited about this engine, its the best of both worlds. 2.3 spool and torque with 2 liter RPM capabilities.

EVO Owners, its time to have your cake and eat it too!

Eric

 

Nice, when i get my Evo9 this well be the engine that well be going into it

 

No core right?

 

that is correct there is no core for this engine.

We already have a few customers putting this powerplant in their EVO's. This truley is a great engine.

Eric

 

Sounds like an awesome setup, is it just as smooth as a stock 4g63?

 

GREAT!!!!!!!!!! Another AMS Product I'll never be able to afford .


How much WHP could this motor take? Could you max out a 42R on it?


Why is there no core exchange?

 

I designed this for maxing a GT37R out, but I'm not sure about a 42R. Max recommended power of about 750-800whp, but it could probably take more.

No core charge because we are using unique and new components.

 

Nice numbers! I have two questions...

1. Do you recommend this motor for daily street driven cars and at what compression ratio?

2. No core...does that mean your selling this as a whole motor and not as a rebuild package for each customer?

I know that second ? sounds retarded...but I just want to be sure LOL

 

when you say power do you mean HP or TQ? because raising a rod ratio will deffinatly increase tq in the upper RPMS... which is why people should do it on stroker motors. the 4Gs stock 1.7 is pretty good, 1.75 would be better... so if martin has gotten close to a stock ratio with a higher stroke then he is going to make more tq in the upper range. and if he has modified a piston to be able to accept a longer rod than a 6.050 given the stroke of this motor than more power to him! I say good job Martin/AMS you get a from GSC on this one....... oh except for those GD O-rings....pain in the *** to change POS's

 

yes this motor can be used on any street car

No core means you will outright buy a complete shortblock. We will not offer an engine kit.

Eric

 

Greg@GSC FTW!

 

I know what I'm getting whenever my stocker goes.. . Nice product AMS

 

Can I just buy Martin's white Evo? I mean really, it'd save me a lot of time.

 

So if I paypal you 5 dollars a day..since that is all I get for allowance....I will be able to purchase this thing in a little under 4 1/2 years...Sweet.

I will be one skinny dude but it will be worth it.

 

Now u guys need to develop a cheap motor for us broke *** college students