https://www.evolutionm.net/forums/au...rr-engine.html

http://www.amsperformance.com/cart/A...3RR-Motor.html

 

Here ya go & look at what they do, to make it work for road racing.

The AMS EVO IV-IX 2.3RR Motor is an AMS EXCLUSIVE! This is the ultimate in road racing power plants providing low RPM torque AND top end horsepower.

The idea behind this project was to design and build an engine that has the RPM range of a 2.0L and the low RPM torque of a stroker. Rod ratio, rod length, and bore to stroke ratio were optimized to support high volumetric efficiency at all RPMs. What we ended up producing was an engine with the broadest power band in the industry!

No expense was spared on this motor. It is stuffed full of only the absolute BEST parts available. The foundation of this motor is an extended deck height block expertly machined to AMS specifications. Extra thick cylinder walls are bored and honed to accept 2.3RR AMS spec pistons which are hard anodized and have a friction reducing skirt coating applied. The pistons have been specially designed for strength while reducing weight to minimize stress on wrist pins, rods and bearings. Our custom length 4130 billet rods are held to the crank with ARP 625+ Custom Age rod bolts. The rotating assembly is specifically designed for high strength and is meticulously balanced to the gram.

Features

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AMS prepped extended deck height block with custom oil squirters
Copper O-ringed deck
Crank is knife edged and gun drilled for weight reduction
AMS spec pistons with slipper skirt for shorter, lighter wrist pin
Choice of compression ratios
2.27 L displacement
No core charge required
Comes completely assembled and balanced
Includes

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Extended deck height block completely machined *
Custom stroke 4130 billet crank
Custom 4130 billet rods
AMS spec pistons *
ARP Main studs
Custom MLS head gasket for proprietary bore size
New Mitsubishi oil pump
New Mitsubishi water pump
AMS race balance shaft
Full assembly by AMS
Detailed installation guide
Specifications

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9.25:1 - Is good for most street and race applications. This can be tuned to make great power on pump gas & race gas.
10.0:1 - Provides great power and response on race gas for track or strip. This can be run on pump gas with caution. (93+ octane only).
2.27 L displacement
Applications

 

Hmmm my bad. Thought it was a different motor, I think I can go through the math and figure it out though. There is one crank choice that doesnt get used much that might be whats being used.

 

SH*t you can build my motor any day! and twice on sunday...

 

Oh yeah that block is effing trick for sure. Was just pointing it out

*pointing

T9 is worthless lol

 

Looking forward to my 4g69 project. Got the 87.5 mm pistons made, running stock length I-beams. Must say not having the stresses of the car being my only vehicle any more is amazing Currently considering the head gasket options as there aren't many

 

Talking with a handfull of engine builders i also been told that they do not recommend the 4G64 for a Track/Time Attack car. The motor would always be ran around peak Torque which is hard on the internals. Maybe if a team ran a 2.4 and shared there findings on the engine abuse we could get more information on what would fail on these motors.

Plus running without squirters during Las Vegas temps would seem like suicide to me for a built motor. Might work for the guy that has 93 Octane and summers that never get higher than 100f. Here we got 91Oct and 100f+ temps...and thats after the sun has set.

 

2.3RR uses a K1 crank and connecting rods, Confirmed it at SEMA 2008 . Pistons of course are a custom Ross.

When i spoke to both companys they said they could get me the parts needed to build this same motor. But honestly it would most likely cost me more to do what AMS does because the custom parts are costly, if your just ordering one set.

 

2.3RR = 86.75 x 96? thats exactly 2.27L.

 

With all that said, I think most evo owners would enjoy a LR 2.4 build. Once they truly understand what it is for. And stop contemplating about putting a small frame turbo to work at >9000rpm.

 

 

If the crank is confirmed to be a K1, they have a 97 mm, so with 86.5 pistons it would be 2.278 lt, with 156 mm rods the only custom part would be the pistons, or not? In my opinion it's not so different, compared to a 100 mm 2.4 lr, also the r/s, 1.60 vs 1.56.....

 

Those AMS custom Ross pistons look like the pin has been shifted up 9mm instead of the standard 6mm stroker piston. You can tell because it will need an oil ring support rail. So, building a 2.4LR with this type piston would require a 159mm custom rod and net you a 1.59 rod stroke ratio. AMS uses the 97mm crank and ends up with a 1.6 rod stroke ratio. Using the factory 100mm crank is much cheaper and you will only need the custom 159mm rods and custom pistons with a 25.7mm compression height. Carillo can make you the custom H-beam rods good for 1000+ hp and weigh in at 575 grams and wiseco can make you a custom 1400hd piston with a compression height of 25.7 and your choice of compression ratio.....9.5 - 10.5

 

that really isnt much compression height to fit a decent crown and the rings in.

 

all this custom this and custom that you just throwing money around with no disregard luck you