MX6/Probe 2.5 vs. 95+Millenia 2.5

[Madamen69]

So a fellow over at MX6.com (compound00) put a Millenia block (block only kept his MX6 heads and intake) in his car and is running mid 14s (he has vids) some believe some don't, well i did some research. THe naysayers say that the engine are exactly the same, well with what i found i disagree.

95+ Millnia 2.5

bore/stroke - 3.31 x 2.95
displacement - 2493
comp ratio - 10 . 1 :eek:
170 HP @ 6000 RPM
169 lb/ft @4000 RPM

93-97 MX-6/Probe 2.5

bore/stroke - 3.33 x 2.92
displacement - 2507
comp ratio - 9.2 . 1
164 HP @ 5600 RPM
160 lb/ft @4000 RPM

If these number are correct then they are not the exact same engine 98% similar yes but not exactly the same. Now if these differences make a difference i don't know :darin: but maybe the combo of the MX6 heads and the higher compression block of the Millenia create some real horsepower. Any input/ constructive critisism is encoraged. Thanks :tup:

[HowLeTT]

the differences in bore/stroke and displacement are negligeable... the main benefit there would be from the higher compression. millenia's must have different heads and/or pistons. 10:1 compression would make a fairly significant difference, its the main reason the ZE pushes more hp than the 03.

[hy_mx6]

I guess the main question is whether or not the compression figure you found for the millenia is accurate. Is the US spec Millenia 2.5 L 10:1 or 9.2:1 like the 03? If it is in fact 10:1, then there is your reason for the power increase. It also is another source of higher compression pistions for us to use in rebuilds, just like the ZE pistons. Also, if the US spec millenia pistons do privide 10:1 compression, an even better question to answer is can you get them in oversizes for a typical bore on a rebuild. The 10:1 ZE pistons are not available in overbore sizes, so that would be a really nice thing to have access to. However, with the extensive research that some of the people on this board have done, I doubt something like this would have been overlooked.

[Madamen69]

this info is per MSN Carpoint

[Triped]

when people say the engine is the same they mean the BLOCK is the same, which it is. So it is very possible to use the block in the MX6.

The V6 Probe, MX6, MX3,626, and Millenia all use the same block, just a different bore and stroke.

[blackjack411]

Say that's one way to do it hy_mx6, here's another;

95+ Millnia 2.5 block bored out to 3.33 and with the 2.95 stoke already there, ZE pistons being higher comp than 03's should bump compression up above 10:1, depending on the pistons difference in size of course. Aren't the ZE heads a different volume than 03? Meaning these Millenia heads, volume that is, are larger than ZE but smaller or same size than 03?

Some one with the data post what a N/A motor could do with the slightly stroked, higher compression combo's. And where is the .03 on the stroke coming from, rods, pistons, crank, heads?

[blackjack411]

Say that's one way to do it hy_mx6, here's another;

95+ Millnia 2.5 block bored out to 3.33 and with the 2.95 stoke already there, ZE pistons being higher comp than 03's should bump compression up above 10:1, depending on the pistons difference in size of course. Aren't the ZE heads a different volume than 03? Meaning these Millenia heads, volume that is, are larger than ZE but smaller or same size than 03?

Some one with the data post what a N/A motor could do with the slightly stroked, higher compression combo's. And where is the .03 on the stroke coming from, rods, pistons, crank, heads?

[Madamen69]

this is all assuming my info is correct i found it on carpoint, anyone know if they are reputable in there specs ?

[Madamen69]

when people say the engine is the same they mean the BLOCK is the same, which it is. So it is very possible to use the block in the MX6.The V6 Probe, MX6, MX3,626, and Millenia all use the same block, just a different bore and stroke.

When i talk about the block i say block, when i talk about the engine as a whole i say engine, just a misinterpretation :shrug:

[ProGTR]

http://www.mazdausa.com/millenia/specs/default.asp?vehicle=millenia&zip=&did=&state=#4

Hope that link works..if not info off that site

Engine Type
2.5L DOHC, 24-valve V6

Horsepower, SAE net 170 @ 5800 rpm
Torque, SAE net
160 @ 4800 rpm

Displacement
2496.6 cc./152 cu. in.

Bore x Stroke
84.5 x 74.2 mm/3.33 in. x 2.92 in.

Compression Ratio
9.2:1

So it's the same compression as an 03...same motor

Different Intake Manifold and a MAF instead of a VAF

[Madamen69]

what year is that ?

[ProGTR]

I assume it's the most current model.

But either way all 2.5 Millenia's came with the 170 HP version motor.

I even heard that they no longer even sell the 2.5 version as no one buys them over the miller cycle motor anyway.

[Madamen69]

damn carpoint got me all jazzed up !:x i wonder how they can make that mistake i always thought they were somewhat accurate :shrug:

[FRCFD6]

the millenia uses a 03 bottom end with a ZE intake runner design and milder cams

[Fazdaze]

If this fellow is now running mid 14s now....what was he running with his stock motor? I can think of several stories of relatively stock 03 engines running mid 14s in Probe and MX-6 cars. Maybe he is just a good driver :???:

I would think that with this extra compression, slighly more displacement and the ZE like intake runners the different in HP would be greater than 6. It doesn't make sense to me. I am going to bet money that the compression ratio is the same for both cars/engines.

[Madamen69]

Fazdaze-

I was thinking the same thing but in the videos you can just hear that thing, its not stock, unless he has some wicked exhaust mods, i'll see if i can find a link to his vids later

[Antwon2000]

Good driver? Millenia's are all ATX's. The driver has less to do with the run than in an MTX. He must have some other stuff done as well. Mid 14's are really good for an all motor Millenia ATX. Remember those things weigh about 300 lbs more than a Probe or MX6 I believe. Correct me if I am wrong.

[Madamen69]

Good driver? Millenia's are all ATX's. The driver has less to do with the run than in an MTX. He must have some other stuff done as well. Mid 14's are really good for an all motor Millenia ATX. Remember those things weigh about 300 lbs more than a Probe or MX6 I believe. Correct me if I am wrong.

Well if he was driving a Millenia then you would be right, but he put a millenia block in his ** MX6 ** and he has a 5 speed

[tripup]

They still offer the Millenia with the KL-03. It is the base engine option under the Miller-Cycle. The reason for me knowing is working at the Manheim Auto Auction here locally and am in charge of the Mazda account. And another tid bit is that even though the Miller-Cycle has more power and what not, the 2.5L is a better seller, some people don't think that the extra 40+- HP isn't worth the money.

[MyMellinie]

Ok first of all I have a '95 Millenia and it runs the same engine as the mx-6/probe with the exception of the intake, maf, and possibly tb. Not sure about tb yet but positive about the others. I don't know what the mx-6 weighs but my millenia's curb weight is 3232 lbs with leather. Anyway hope this helps

Marcus:D

[tripup]

December '93 Motor Trend comparison test of the then new '94 Acura Integra GS-R and and a '93 Ford Probe GT said that with the following options:Preferred equipment package(basic power amenities), Premium stereo, power antenna, equalizer, power seat, power sunroof, mats and anti-theft....the Probe weighed in at 2921 Lbs.....thats also no leather and MTX.

[2point3]

Originally posted by Madamen69
Fazdaze-

I was thinking the same thing but in the videos you can just hear that thing, its not stock, unless he has some wicked exhaust mods, i'll see if i can find a link to his vids later

His car has straight through dual exhaust and it sounds even meaner in person. All he has is cold air intake dual exhaust and that block his times and kills are pretty impresive considering he has basicly just a KL-03 with intake and exhaust I cant think of anyone else with those times with only those mods.