How new is the 'new' 2.5 engine? - Toyota RAV4 Forums
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post #1 of 33 (permalink) Old 01-26-2019, 10:14 AM Thread Starter
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How new is the 'new' 2.5 engine?

I keep hearing 'new' 2.5 engine in the 2019 RAV4. Is it really a new engine or is it the same 2.5 with some tweaks? Wondering if it's tried and true or really is new with possible unknown problems.
Thanks for any info.
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post #2 of 33 (permalink) Old 01-26-2019, 11:46 AM
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It's a different engine, been in the '18 Camry since late 2017, same for the 8-AT.

https://toyota-club.net/files/faq/18..._df_r4_eng.htm

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post #3 of 33 (permalink) Old 01-26-2019, 12:39 PM
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I've driven the '18 and '19, and oh yes, a world of difference. feels like a complete different car, much higher torque in the lower revs and better EV battery.
The same engine resides in the new Lexus ES, together with the same gearbox, safety features, TNGA platform etc.

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post #4 of 33 (permalink) Old 01-26-2019, 01:09 PM
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The only Lexus ES with the 2.5L A25 engine is the 300H Hybrid, the Lexus ES350 has a V6. Here's more on the gas version.

Toyota A25A-FKS 2.5 D-4S Engine specs, problems, reliability, oil, Camry 70, Rav4

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post #5 of 33 (permalink) Old 01-26-2019, 01:27 PM
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Makes sense for the US. The ES 300H is new in Europe... That's why i mentioned it. Dutch Lexus site (use Google Translate to make it readable for you guys): https://www.lexus.nl/car-models/es/?...zEALw_wcB#hero

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post #6 of 33 (permalink) Old 01-26-2019, 01:29 PM Thread Starter
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Thanks for the links, Quickdtoo.
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post #7 of 33 (permalink) Old 02-09-2019, 10:16 AM
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When they redesigned the fuel flow, and upped the compression ratio to 13:1, it accounted for being able to get more horsepower from the same size overall displacement.



My only thought is if the super high compression (which produces more heat) will effect engine life?


I mean Toyota motors are known for easily getting into the 200,000 miles range, will this continue or be reduced?
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post #8 of 33 (permalink) Old 02-09-2019, 11:05 AM
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Quote:
Originally Posted by MythosDreamLab View Post
When they redesigned the fuel flow, and upped the compression ratio to 13:1, it accounted for being able to get more horsepower from the same size overall displacement.

My only thought is if the super high compression (which produces more heat) will effect engine life?
From the link in post 2:
Quote:
Similarly (to) other modern Toyota engines, A25A has a high geometric compression ratio (13-14). Although it would be more accurate to say "expansion ratio" - the actual compression ratio for Miller cycle is much lower, so the engines are designed for low octane gasoline (RON 91 / Regular).
I'm by no means well educated on Miller cycle engines, but they seem to be becoming more prevalent as manufactures strive after the gods of fuel economy. Every 5-7% counts. Apparently Miller reduces running compression ratio by using intake valve timing to not allow full cylinder filling. So now we need a cam driven vacuum pump to supply the brake booster:
Quote:
A vacuum pump is required because of D-4 engine does not provide enough vacuum in the intake manifold for brake booster operation.

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post #9 of 33 (permalink) Old 02-09-2019, 12:40 PM Thread Starter
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Quote:
Originally Posted by MythosDreamLab View Post
My only thought is if the super high compression (which produces more heat) will effect engine life?

I mean Toyota motors are known for easily getting into the 200,000 miles range, will this continue or be reduced?
See my post below that is in the 4.5 General forum pointing out concerns about the new engine:
https://www.rav4world.com/forums/197...ew-engine.html

That thread did not draw much discussion.
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post #10 of 33 (permalink) Old 02-10-2019, 01:32 PM
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This new engine ( and the 0-16 oil ) is the one thing that concerns me about the 2019 Rav4.
I like vehicles with longevity in mind . The fact that the new Rav does not have a CVT and a turbo engine is appealing to me.
The other issues that I've read about : mainly the engine / road noise I think I could live with.
Have to check on the passenger seat and headroom ( I'm 6'3").
The mpg is impressive on the new Rav.


In the end I'll trust Toyota's engineering and hope for the best with the new engine.



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