Wasn't sure if word was out on this just yet:

http://www.jdmtuningnews.com/articles/62308f.htm

JUN AUTO's Machine Shop has just placed its CUSTOM KIT EX 2.3L For 4B11 on sale in Japan for Mitsubishi's Lancer Evolution X engine. This Custom Kit expands engine displacement by enlarged bore and stroke by providing more power and torque capabilities of your Stroker Assemblies - Includes JUN Crankshaft, JUN Piston Kit and JUN Super Connecting rods. JUN continues to hone it's high quality in the areas of lightweightness, high strength, and rate of balance with these new parts. A higher response and torque is offered. You can use it broadly in various forms of autosport such as circuit running, drag racing etc.. Engine piston displacement becomes 2307cc, the bore and stroke diameter is 87mm x 97mm. Retail is 472,500 yen including tax. Contents include: PISTON KIT, I-BEAM RODS, FORGED CRANK SHAFT, OIL JETS.

 

I wonder if boring the 4B11 without sleaving it is a good idea..... I guess they will find out how strong the block is.

 

I think a stroker 4B11 is dumb. Its a square engine, why not treat it like a Honda K20- Put on a big turbo and rev the snot out of it. The gearing supplements this idea.

 

I was more excited to see thier cams, springs, and titanium retainers. They were on Jun's website also.

 

I agree.

 

edit

 

But in Yen it's just under $4400.

 

edit..

 

why is it a dumb idea?? is it dumb to stroke the 4G63?? shorly its better to stroke a square engine than a under square (longer stroke) engine.

Chris.

 

Live rates at 2008.06.23 15:11:49 UTC

472,500.00 JPY = 4,377.35 USD

Japan Yen United States Dollars

1 JPY = 0.00926423 USD 1 USD = 107.942 JPY

Thats how it's done.

XE.com

$4377.35 for a stroker kit from them isn't a bad price.

anyone get pricing on the cams, valvesprings and retainers?

Thanks,
Chris

 

opps... I hit YUN and not YEN... LMAO

 

I didn't see them on Jun's site, but this is what I really want to know.

 

Actually I agree that it is a silly idea, and it is on the 4G63 as well. That is a lot of stroke in a short deck. I don't know what the deck height is on the 4B11, but I think it is shorter than the 4G.

If you look at all the most powerful 4 cylinder engines in the world (1000hp+) whether they are Honda, 4G, Ecotec, or other, they do not run huge strokes. They run a smaller stroke and turn the motor above 10,000. Large stroke motors are hard on rod bearings, rings, and the cylinder bores. At 35psi and above, you distort a bore REAL fast.

It is silly on a turbo car. If we were building an all motor 4B11, then that would be a great way to get power

How many 4G guys on a 100mm stroke are looking at rod bearing and ring wear on a regular basis? The average guy isn't, and every single person I know that runs a 2.3 4G has had a rod bearing failure at some point. I know there will now be a handful of guys get on here saying they have never had an issue and that is great, but have them take their motor apart and take a look. With modern turbocharger technology, there is no reason to run a stroke like that and have to put up with the increased wear and tear. Just my opinion.

 

You guy's should call JUN up and tell them they don't know what they're doing.
They're a bunch of newbs at this engine thing.

 

I've seen more than a few fragged JUN internalled Honda B blocks.

But don't get all butthurt, my aim isn't to attack JUN. There are different ways to make power. The bigger the turbo, the more benefit you will see from revving a four cylinder. A stroked engine will have super high piston speeds and be more prone to failure from wear. Diminishing returns will set in really fast. Its been proven with some built 4G63s. In AWD cars like these, low end torque in every gear but first is overrated and can be cured by downshifting, provided you have the RPM headroom to stay on boil after upshift.