Jowett

This shows the differences between the silver and blue top 2UR-GSE Engines.

http://global.yamaha-motor.com/jp/pr...pdf/51gs01.pdf

Original 2UR paper here

https://www.clublexus.com/forums/is-...ech-paper.html

IS_250

iTrader: (2)

Anyone good with Japanese?

mikersoft

iTrader: (1)

Yeah, my wife & kids, but didn't someone already do that in the CL thread (2nd link above)? Is there some information you'd like that was not translated?

-Mike

flowrider

iTrader: (9)

I'd love to be able to read and understand that paper. some of it is obvious, but not a lot.

Thanks for posting

To the post above - No the second link covers the original ISF engine and was posted 4 years ago.

Lou

Jowett

The silver top IS F paper was translated, but not the new blue top... Can't seem to grab much of it and paste into translate.

Here are the basics, though.

Compression ratio UP intake and exhaust port improvement (intake: a high flow rate and high tumble)
Cam profile improvement (valve lift UP)
Operating range expansion (performance, both of fuel consumption, Atkinson cycle of)
Crank pin size reduction, counter weight reduction high-strength forged material, the large end hole size reduction
Titanating
Shape improved (oil hitting improvement)
Change Material
Water cooling + air cooling (circuit racing corresponding strengthening) tube length, tube diameter, optimized larger diameter surge tank volume (φ83 ← φ76) Semi dual of (exhaust interference reduction)
New D 4S (high fuel pressure of, spray shape improvement) with One way clutch
Valve lift (mm) / Material
Fuel supply system
13.0 / Ti

mikersoft

iTrader: (1)

Oops, sorry for the misunderstanding. I can ask my wife to take a look at the more recent doc.. Though, she gets paid to translate documents, so this might cost me!

-Mike

MileHIFcar

Poor you, I'm sure you can find a way to pay her Inquiring minds want to know what that says

tas02

iTrader: (2)

Hmmm... translates to "blue top better than silver top".

Interesting to hear about the crank pin size reduction. So the RC's got a lower bearing speed for increased high rpm longetivity.

Will think twice about using all of my new 7200 rpm redline.

Jowett

They also went back to a steel bearing.

SubOrbital

I always thought the Toyota enthusiast naming of "top" had to do with the valve covers. Both incarnations of the 2UR have silver/naked valve covers do they not? Are we just referring to the intake manifold color?

Jowett

Yes, we are using the intake manifold color here.... but we are using it the same way that valve cover colors on the 4AGE differentiated the various versions of that engine.

Fsport2UR

But the different color valve covers on the 4AGE were done intentionally to differentiate the variations. While the 2URGSE in the RCF is different than the ISF, I don't think the color change was intended to show a variation change between engine designs, but rather done more for aesthetic purposes. I guess time will tell, when a newer variation comes out and if they do change the color of the intake.

F_Throttle

Anyone see the exhaust manifold change on the RH-side? Wonder if that was done for space or function.

SubOrbital

I can't tell, but it LOOKS like they are collecting different cylinder exhaust pulses.

SmurFPwr

any luck or link that shows the blue top translated?