Aftermarket rods & stock pistons

Discussion in 'Mazdaspeed 3/6 Engine' started by g00s3y, Nov 26, 2016.

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  1. Everton992000

    Everton992000 Greenie Member

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    I think I understand what he's saying. Last winter when I would get up for work I'd hop in my car and drive immediately. Until it got up to operating temp everything just felt sluggish and not as it did when fully warm.


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    Everton992000, via a mobile device, Dec 28, 2016
    #61
  2. Realgib3

    Realgib3 Greenie Member

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    Yeah if you're really looking at staying 500whp range and daily driving, then H-beams, 4032's, stock head/main bolts, no key needed if installed properly.
     
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  3. Sho

    Sho Silver Member

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    I would attribute it to the tune pulling timing while coolant temp is below "xx" degrees.

    @Realgib3 can probably confirm with my car. But when I was stock block, I could drive the car under 130* coolant temp, but it wouldn't run very well. Just very sluggish.

    Now that I'm on a built motor, if I even try to drive anywhere before the coolant temp hits 140*, it's damn near undriveable. 140* is the sweet spot where everything goes into place on my car. I could try pulling down my road while coolant temp is 136* and the car struggles and bucks back and forth, and just drives like crap, but as soon as temp hits 140*, it's like a flip is switched and car drives perfect.
    [doublepost=1482959843][/doublepost]
    H beams, standard Manley wrist pins, 88mm Manley platinum series pistons (2618), oem bearings (main and rods) , no Keyed crank, and oem head studs.

    53k+ miles so far. The first 38k seeing 28-30 psi and 16* up top on a 5862, and the last 15k at 35psi and 18* on the same turbo. Boost curve is progressive to keep torque down. E23 mix in the tank, and spraying 2000cc min of 100% meth.

    Here's compression test that was done not too long ago
    [​IMG]
     
    Sho, via a mobile device, Dec 28, 2016
    #63
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  4. alexwlwsn

    alexwlwsn Gold Member

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    I also feel as though the sluggishness comes from the fact that your car is pulling less vac and technically has less compression when cold on a built motor since the pistons are contracted.
     
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  5. Sho

    Sho Silver Member

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    Yes that too. I don't typically see full vacuum at idle til the car is above 160*
     
    Sho, via a mobile device, Dec 28, 2016
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  6. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    EXCELLENT compression. Stock CR? If not, I wanna use that honey badger tester, LOL ;)
     
  7. Sho

    Sho Silver Member

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    Yes, stock CR. Compression was 190 across the board at 1k miles after break in.
     
    Sho, via a mobile device, Dec 28, 2016
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  8. DaTFranchise_ms3

    DaTFranchise_ms3 Greenie Member

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    Mine runs like shit too till about 150-160 degrees but I pull 21-22 inch of vacuum as low as 120 degrees after it comes off fast idle.

    I always let the car hit at least 120 before I start driving and I never beat on it or get into too much boost till I know the oil is somewhat warmed up.

    With 2618s the most wear will happen during warm up so it's very important to let the motor get warmed up good before loading it and don't just rely on coolant temperature, the oil needs to be good and warm too.
     
    Last edited: Aug 22, 2017
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  9. djohns

    djohns Greenie Member

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    @Redline; any of the companies you reached out to give you a response yet?
     
    djohns, via an iPhone, Dec 30, 2016
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  10. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    Nope, not yet. I think they're all on holiday vacation, LOL. Don't worry; I'm extremely persistent. Numerous emails will be sent, and then I'll move to the numerous phone calls, if necessary.
     
    Last edited: Dec 30, 2016
  11. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    @broda @WetzMS3 @Mauro_Penguin @davychronic

    Here you go: straight from a Mahle piston engineer who worked specifically on our 4032s for SP63:

    "Zack,

    I worked with Speed Performance on the design of these parts. The 425whp rating is conservative. I would recommend the 4032 for your application at 500whp and using methanol / alcohol. The 2618 would give you a higher safety factor but as you stated the life span of the part is less.

    The 2618 part should be approximately 10g heavier at the same bore size.

    Kind regards,
    Justin Dossett
    MAHLE Engine Components USA, Inc.
    MAHLE Motorsports (IMO7)"

    So in other words, he's saying exactly what I was saying and @Realgib3 was saying: since I'll be using so much alky, the 4032s would be perfectly fine for me, and offer numerous other benefits as well, including longer service life, lighter weight, tighter PWC (so less chance of ovaling), faster warming up/ready to drive, more DD-friendly, less chance of burning oil, etc. @g00s3y just has to decide on his whp goals, and if/what amount of alky he'll run (if it's even necessary for his power goals).

    I'll update as more piston manufacturers weigh in too. But in my eyes, this guy's view is really the final word on the matter. The 4032s are, after all, from Mahle; from him and his design team.

    Edit: I also posted this in my personal 4032 thread that I started a while back because it's relevant.
     
    Last edited: Jan 4, 2017
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  12. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    More info from our Mahle 4032 Piston engineer:

    "Zack,

    Piston to wall clearance should be 0.0020" for the 4032.

    Top ring gap 0.021"-0.024"
    2nd ring gap 0.017"-0.024"

    Kind regards,
    Justin Dossett

    MAHLE Engine Components USA, Inc.

    MAHLE Motorsports (IMO7)"

    Since we normally run a smaller top gap, and slightly larger bottom, I asked him if 0.021" (top) and 0.023" (bottom) would be good for my goals. We'll see what's what. The general Mazdaspeed practice is to have smaller/larger top/bottom gaps. These 4032s may be game-changers in this regard. Any engine builders on here want to speculate/reason about how this would apply with these pistons?
    [doublepost=1483638709][/doublepost]Response

    Me:
    "Justin,

    Gotcha. You've been so kind to entertain my responses. Just one more quick question: is there a certain specific ring-end gap you'd recommend for 500whp and ~40% fueling from ethanol methanol? Folks with my platform have had a TON of luck running a slightly smaller top end-gap. I think it had something to do with combustion gasses not getting trapped, but I don't remember for sure. Anyways, what about maybe:

    0.021" top
    0.023" bottom?

    Does that sound about right for me?"

    Justin @ Mahle:
    "That will work yes and will be safe.

    There are several thoughts behind staggering top and second ring gap. You will see conflicting arguments but piston design and application are the two largest drivers.

    On the piston design side, the driver is whether is has an accumulator groove on the land between the top and second ring. The groove acts as a reservoir for gasses that get past the top ring. Having the extra volume between the rings reduces the pressure that could potentially unseat the top ring. The majority of our pistons have an accumulator groove (The ones you are selecting do). Without the groove, the second ring gap needs to be larger so that gasses escaping past the top ring have a leak path so pressure will not build between the top and second ring.

    Heat is another factor in selecting ring gaps. The top ring sees significantly more heat than the second so the amount the running gap reduces will be less on the top due to the differential in heat. So if you run the same ring gap on top and second, while the engine is running, the second will have a larger gap.

    Hope this helps."
     
    Last edited: Jan 5, 2017
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  13. Sho

    Sho Silver Member

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    I run 0.020 top and 0.022 bottom on my Manley's... Hmm.


    Then again, I'm no engine builder lol.
     
    Last edited: Jan 6, 2017
    Sho, via a mobile device, Jan 6, 2017
    #73
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  14. SharksInSpace

    SharksInSpace Planets and shit. Silver Member

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    I like that he didn't just confirm that your suggested gaps would work safely, but also explained the logic behind staggering the sizes. I'm sure that not everyone would have taken the time to do that, rather than just send back a quick "yep, that'll work."
     
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  15. Redline

    Redline I done fucked up for the last time. BANNED Greenie Member

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    Yeah, I talked to him on the phone, too. He said he'd personally run 0.021" top and bottom, which would effectively be a smaller gap up top due to the much higher heat that it sees. This means the top gap would close more, and the bottom gap wouldn't close as much, so when the car is fully warmed up, the gaps that started the same at 0.021" for both would be smaller on the top ring and larger on the second ring. These pistons have gas pockets to prevent the building up of pressure that could unseat the top ring, etc., too, so they really are a great design.

    I also like how he actually deferred to SP63 because that's where the rubber meets the road. They're building actually building these engines, and we all know that actual practical experience >>> pure theory. SP63 said that they may vary the ring gap some based upon if the cylinder had a little bit of taper, and/or other issues, which sometimes occur. A perfectly machined block down to the ten-thousandth of an inch doesn't happen 100% of the time, and when this is the case, the proper ring gaps can be impacted.
     
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  16. Ryan Krebs

    Ryan Krebs Greenie N00B Member

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    Not to beat an old horse to death, but I am building an engine that I want to use the stock pistons with a set of Eagle rods. I was just wondering if anyone has seen an article or knows what needs to be "trimed" on an aftermarket rod.
     
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  17. DaTFranchise_ms3

    DaTFranchise_ms3 Greenie Member

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    Some of most of it but not all maybe just a little but could be a lot depends on if some is not enough then you may need to take a little more then a lot.
     
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  18. VoodooJef

    VoodooJef My friends call me Captain Zen Greenie Member

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    If you buy aftermarket rods with the correct wrist pin diameter (they do exist) then you won`t have to shave/polish/hone anything. It`s not a common idea but not a terrible one.
     
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  19. DaTFranchise_ms3

    DaTFranchise_ms3 Greenie Member

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    I guess I’ll put this here sense we were talking about alloys too.

    Just hit 30,000 miles on my bottom end and got my first piston slappy slappy this morning. 2618’s. Mind you this is a pop n drop so it wasn’t exactly torque plated and properly honed, just used a dingleberry and brush, but they were round, straight and PWC was spot on, just the cross hatch wasn’t the best lol
     
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  20. Sho

    Sho Silver Member

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    I guess I'll update as well. Nearing 69k om my Manley Rods and pistons. Still no piston slap on cold start. Haven't done a compression test in a while, but the car still pulls hard.

     
    Sho, via a mobile device, Nov 17, 2017
    #80
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