whats inside the ms3 motor??

[SwampAss]

That's great that you say that the engine has vvt...but where's your proof?

How much do you need?

http://www.motortrend.com/cars/2007/mazda/mazdaspeed3/specifications/


http://www.internetautoguide.com/car-specifications/09-int/2007/mazda/mazdaspeed3/index.html


Hell, it's on page 8 of the sales brochure:

http://www.who -sells-it.com/images/catalogs/784/pdf_9324.pdf remove space

 

[VermZ06]

I've been proven wrong... I'll admit it

 

[VermZ06]

this is straight from wikipedia...so take it for what it's worth...although technically this engine is continuous variable valve timing

The MZR is Mazda's latest Straight-4 gasoline powered engine. Development was assisted by Ford, who also sell the engine as the Duratec. The MZR family features a special long intake manifold for added torque, S-VT continuous variable valve timing, and a stainless steel 4:1 exhaust header.

Mazda S-VT - Varies timing by rotating the camshaft.

 

[6262MS3]

I think people are confusing vtec's cam phasing with variable valve timing. vtec actually slides the cam over to a different, high rpm cam lobe. This switching from a low rpm lobe to a high rpm lobe is what creates the whole "vtec just kicked in, yo!". vvt changes the timing of the camshaft without switching to a different lobe, these timing changes allow a broader torque spread and better fuel economy. Newer honda engines have both. The power drop-off on our cars has nothing to do with the cams, mazda's ecu tuning cuts the boost and starts closing the throttle plate above 5500rpm, presumably to make the engine harder to blow up.

 

[Captain KRM P5]

article is correct, they are forged. Not all forged rods look like what you show in your post, common misconception. Forged rods can look like cast rods as well, that doesn't automatically make them cast...

i have sent the rods out for inspection by more than just my own eyes. they are definetely cast. there are even casting marks on the individual rods.

regardless of that, every forged rod i have dealt with looks pretty much like what i posted, with the exception of I-beam VS A-beam VS H-beam.

 

[Captain KRM P5]

The article is most definitely correct...its from Mazda's corporate website.

mazda's usa website also states that the flywheels are interchangable between the mazdaspeed and non mazdaspeed 2.3s. been there, done that and proven thats not true either. even mazda can make errors.

http://www.mazdausa.com/MusaWeb/spe...LineCode=MZ6&startModelYear=2004&categoryId=3

not even close to being the same part. keep in mind now, i'm not trying to come across like a jerk, but i'm pretty hard to convince as a person who has pulled a bunch of these engines apart already and handled the parts personally. and we've pulled them apart mind you because connecting rods have snapped, curled or bent. i'll happily take the internals i have to any machine shop or mazda master tech and have him confirm or deny.

 

[SwampAss]

I have to side with Ken on this one. He's pulled the motors apart and has seen first hand what comes out.
Manufacturers aren't noted for being the most accurate when it comes to description. Even if the mistakes are honest.

 

[dkswim]

here is a good sight for you to check out. http://www.sportcompactcarweb.com/features/0610sccp_2007_mazdaspeed_3

 

[redrocketz]

if the engine was soo strong they wouldn't need to take away all the power from the top of the rpm range would they...

I have disassembled these engines and can say honestly I don't think these are forged rods I've built many of engine and seen many different forged intrernals and none look like those.

 

[dkswim]

the loosing power at the top is a ford thing it happens on ford focus and other ford cars. its a safety issue to keep from over reving the hell out of it. most of the stress on an engine is from rpms not boost.

 

[Fritch]

i have sent the rods out for inspection by more than just my own eyes. they are definetely cast. there are even casting marks on the individual rods.

regardless of that, every forged rod i have dealt with looks pretty much like what i posted, with the exception of I-beam VS A-beam VS H-beam.

a lot of manufactures that have forged rods as OEM, will look like that. Specifically GM rods, they almost always look like cast rods even if they are forged.

Research it some more and you'll see. However I do agree that most aftermarket rods do look like what you posted.

 

[nig3]

they are forged rods, they just arent machined all pretty like the aftermarket ones. check this s***--->> http://www.cardomain.com/ride/2230297

 

[nig3]

I think people are confusing vtec's cam phasing with variable valve timing.

UUUHHHH vtec has nothing to do with cam phasing, vtec is only cam lift!!! Cam phasing or timing is vvt only!!! Unless you have both like the new i-vtec motors, or toyotas 2zz-ge ect.... . Most new motors come with vvt, not vtec. and yes the MS3 motor does in fact have VVT.

 

[Young Roids]

The MS3 has the valve timing on the intake cam only.

 

[Boother]

I had to bring this back to put this mis-information to rest.

The stock rods are forged! Forged rods still have rough surface finishes and a rough parting line that can be mistaken for a casting parting line.

Here are some pitures of factory forged, aftermarket forged and aftermarket fully machined forged rods....

Factory forged.

Aftermarket forged.

Aftermarket machined forged.

 

[VermZ06]

The stock rods are forged! Forged rods still have rough surface finishes and a rough parting line that can be mistaken for a casting parting line.

Good to know...thanks for reopening this because I don't think this issue was ever settled. This makes me feel much more confident in the DISI...

 

[BlackCherry06]

Don't be over-confident

 

[VermZ06]

Yikes (sick)

 

[2.0t03speed]

subbin for later use

 

[ptrautne]

Don't be over-confident

The parting line is a sure sign thats its a forged part. When the parting line is wide like that its a forged part because the dies that form the part can never touch. The cast part will have the parting line in the same spot but will be skinny because it will either be an overflow or a gate for the material