Subaru Boxer vs. Atkinson cycle engine ? Reliability and Longevity?

19,865

Asked by Jul 25, 2015 at 11:50 PM about the 2010 Subaru Outback 2.5i Limited

Question type: General

Could you please explain why the Atkinson cycle Inline Four is more popular than the flat
Four horizontally opposed Boxer engine?   Is it because of production costs or some
other reason.   Other than Porsche,  Subaru is the only other major car manufacturer to
stand by this design.  A real niche market.   Do you really think it costs more to maintain?

6 Answers

19,865

Here's some info on this, http://www.autoevolution.com/news/there-s-a- big-difference-between-a-boxer-and-flat-engine-85305.html

3 of 3 people found this helpful.
19,865

And , some more information, please comment, http://www.e31.net/engines_e.html

Boxer engine is used for both the Scion FR-S and Subaru BR-Z. Toyota would've never agreed to use it in the FR-S if there were reliability or high cost concerns. But both cars are new, so we'll see how they hold up...Although they aren't selling too well, both are awesome cars!

1 of 1 people found this helpful.
19,865

James, while these are new models, the boxer engine is by no means a new engine. And, Toyota has a share in Subaru. Both the FRS and the BRZ share some similar components. Do you have any comments on the efficiency of the flat engine design over the traditional inline Four. The design of the engine means there's no counterweight balance on the crankshaft. Also, rather than pushing up and down against gravity, these engines move side to side. What do you think?

1 of 1 people found this helpful.

Not all inline fours use the Atkinson cycle, which is often used on hybrids and keeps the intake valve open longer to increase efficiency at the cost of horsepower. (In other words, Subaru could adapt the Atkinson cycle to the flat-four as well). Subaru's flat-four engines are easily as fuel-efficient as an equivalent inline design, and (although arguably a bit noisy) have notably less vibration than an inline engine as the second-order vibrations cancel out. They are low, lightweight and fit well with Subaru's AWD system. The biggest disadvantages of the flat-four are the wide design (which would not work well mounted transversely) and the added complexity of two sets of camshafts/valves/heads instead of one.

4,580

Yes, Mark...it appears that you're conflating apples and oranges again. Maybe that's why responses are withheld?

Your Answer

Add photo

Related Questions

  • Subaru Boxer vs. Atkinson cycle engine ? Reliability and Longevity? 6 answers

    Could you please explain why the Atkinson cycle Inline Four is more popular than the flat Four horizontally opposed Boxer engine? Is it because of production costs or some other reason. Other th...

    2010 Subaru Outback 2.5i Limited

    -

    General

  • 3.6 vs. 2.5 - Reliability, Stalling and Oil Burning 14 answers

    Recently, I've read and heard from several sources that there's more STALLING problems with the 3.6 H6 Boxer engines. This is NOT GOOD. In traffic situations, it's very dangerous to have your eng...

    2010 Subaru Outback 2.5i Limited

    -

    General

  • RELIABILITY - Subaru CVT vs. Toyota Power Sharing Transmission 57 answers

    While they may seem similar, the actual platform that each of these cars use is different. Subaru is a metal belt driven CVT with pulleys while the power sharing transmission uses a planetary gea...

    2010 Subaru Outback 2.5i Limited

    -

    General

  • Dual clutch vs. CVT - Reliability shoot out 1 answer

    Dual-clutch transmissions, which date back decades, were developed in Europe. They work like a pair of manual transmissions operating in tandem -- one with the odd-numbered gears, another with the e...

    2010 Subaru Outback 2.5i Limited

    -

    General

  • Can Subaru boxer engines be comparable in quality to Porsche? 23 answers

    Both of them make boxer engines used in production today for various cars, including the Porsche Boxster and the almost the entire line of all Subaru cars. So, how would you compare the quality an...

    2010 Subaru Outback 2.5i Limited

    -

    General

Outback

Looking for a Used Outback in your area?

CarGurus has 42,351 nationwide Outback listings starting at $1,100.

ZIP:

Search Subaru Outback Questions

Subaru Outback Experts

#1 Markw1952
Markw1952
Reputation 7,020
#2 TheSubaruGuruBoston
TheSubaruGuruBoston
Reputation 2,200
#3 F_O_R
F_O_R
Reputation 1,860
View All

Related Models For Sale

Used Subaru Forester
413 Great Deals out of 29,349 listings starting at $995
Used Subaru Impreza
203 Great Deals out of 19,393 listings starting at $1,995
Used Subaru Legacy
225 Great Deals out of 14,432 listings starting at $999
Used Honda CR-V
924 Great Deals out of 59,345 listings starting at $1,990
Used Toyota RAV4
892 Great Deals out of 67,125 listings starting at $1,990
Used Toyota Highlander
362 Great Deals out of 26,007 listings starting at $2,800
Used Toyota 4Runner
260 Great Deals out of 19,017 listings starting at $2,500
Used Toyota Tacoma
473 Great Deals out of 41,586 listings starting at $1,995
Used Honda Accord
946 Great Deals out of 77,735 listings starting at $899
Used Ford Escape
1,438 Great Deals out of 90,835 listings starting at $900
Used Jeep Grand Cherokee
1,022 Great Deals out of 72,251 listings starting at $700
Used Toyota Camry
1,104 Great Deals out of 90,757 listings starting at $1,599
Used Honda Pilot
390 Great Deals out of 22,299 listings starting at $1,500

Used Cars For Sale

2017 Subaru Outback 2.5i Limited For Sale
22 Great Deals out of 13,200 listings starting at $25,787
2016 Subaru Outback 2.5i Limited For Sale
25 Great Deals out of 407 listings starting at $18,913
2015 Subaru Outback 2.5i Limited For Sale
20 Great Deals out of 575 listings starting at $15,990
2014 Subaru Outback 2.5i Limited For Sale
20 Great Deals out of 478 listings starting at $11,999
2013 Subaru Outback 2.5i Limited For Sale
10 Great Deals out of 334 listings starting at $8,950

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.