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Thread: mechanical advice?

  1. #1
    God/dess Lena's Avatar
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    Default mechanical advice?

    It's hard to try to have a conversation about this stuff when I don't know what the fuck I'm talking about. Help!

    How does turbo work? How does indirect injection work (it doesn't have a feul pump? or it does?)? What creates backpressure to the turbo?

    Help!

    Lena



  2. #2
    Featured Member polecat's Avatar
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    Default Re: mechanical advice?

    Hi Lena!

    Some basics about engines- engines run by burning a mixture of air and fuel. There are many ways to mix/provide both the air and fuel. Most normal combustion engines use vacuum (i.e. when the cylinder is going downwards, it creates a suction/vacuum) to draw fuel into it's cylinders. Most devices (like carbuerators) also simply draw air to mix with the fuel from an opening on the top or sides.

    Turbo Chargers or Super Chargers change this up a bit. They are both forms of forced induction. Instead of the engine's natural suction of the cylinders going downwards to draw air/fuel mixture, they instead force/ram air down them, thus increasing performance.

    Super Chargers (or "blowers") provide their force from a belt on the engine and are a set of rotors turned by the engine's rotation (much like the fan on the front of your engine). There is some "lag" as the power to rotate the super charger itself occurs, then is paid off when that is used to force air/fuel down the cylinders.

    Turbo Chargers bolt on to the exhaust of your engine and use the exhaust pressure to spin their rotors to produce this force. This also introduces lag and backpressure- since it's kinda like stuffing a tennis ball in your exhaust pipe. In all, there is a lag from when the engine starts to rev-up and the resultant extra power created from the pressure of the turbine spinning from exhaust gas pressure.

    How healthy the bearings and turbo charger are, as well as how much boost it's meant to create determines how much backpressure results. As turbos get older and have a harder time spinning, they can start to introduce more and more backpressure. This is why it's imperative to keep turbo-charged engines with fresh oil always. They are exposed to super hot exhaust gases and need to be correctly lubricated.

    Fuel pumps simply get gasoline from alll the way back of the car of the gas tank up to the engine. From there, it's either a form of forced induction or natural cylinder vacuum (from it's downward stroke) to let air/fuel mixture into the cylinders.

    Fuel injection still somewhat uses natural cylinder vacuum to draw air/fuel mixture, but is more accurate than a simple carb. Fuel injection places a sensor on the exhaust gases (not a turbine using it's pressure so there is no backpressure) so as to tune the air/fuel mixture perfectly. As more unburned fuel is sensed in the exhaust gases, it can lean-up (as in add more air) to the mixture, or vice versa.

    This is very, very basic and layman's way of putting things.. hope it helps grasp the concepts for ya.
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    Default Re: mechanical advice?

    Direct injenction is when the fuel is injected directly into the combustion chamber(where air+fuel+spark = boom)....most cars have a normal injection system, in which the fuel is injected somewhere before the combustion chamber. DI has a lot of advantages....you get much better gas mileage...better performance...safer for the engine....blah blah blah It still uses a fuel pump...everything is the same..except where the fuel enters the engine.

    A turbo is a compressor...it compresses the air so that more of it can fit in the combustion chamber....the more air you put in the engine the more power it can make...thats the basics of it.

    Backpressure is caused by the exhaust system(down pipe...center section...and muffler)...with a turbo you want as little back pressure as possible so the turbo can "spool"(spin) faster and create the compressed air ASAP.

    Backpressure isnt important on a turbo engine...basically you dont want any on a turbo....but on a car without a turbo you need a little backpressure(thats a long explanation)

    hope that makes it clear

  4. #4
    Pamela
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    Default Re: mechanical advice?

    State Your Experience!

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    God/dess Mastridonicus's Avatar
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    Default Re: mechanical advice?

    Ask Me Anything....
    People are not ruled by their memories.

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    Default Re: mechanical advice?

    i have no experience...but i did stay at a holiday inn express last night

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    God/dess Lena's Avatar
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    Default Re: mechanical advice?

    Thanks guys. :-) I'd give you all free lapdances if you were here.

    Does anyone know about the '89 Ford 6.6l engine in particular?

    Lena



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    Default Re: mechanical advice?

    No but a Holiday Inn express and a couple of comp ld sounds good lol - time for bed I am getting into trouble I just know it !

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    God/dess threlayer's Avatar
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    Default Re: mechanical advice?

    If you want to know anything about that all-important subject - OIL- ask Bob the Oil Guy at http://theoildrop.server101.com/cgi/...cgi?category=1 especially important for turbo-d engines.

    Let me see if I can still find that long exposition on Ford V-8 I had 4 years ago. I believe it covered the 400 cu.inch too. In the meantime here's a good exposition of the family the 400 came from. http://www.biography.ms/Ford_335_engine.html.

    The Ford 400 engine displaced 6.7 L (408 in), making it the largest small-block V8 ever made. It was introduced in model year 1971 with a full half-inch (13 mm) longer stroke than the 351 Cleveland, making it the longest-stroke Ford pushrod V8 engine. A long-stroke engine has good low-end torque, for which it trades high-end power. This was a good compromise given Ford's requirement for an engine to power heavier mid-size and full-size cars and light trucks. The M-block, as it became known, was the last pushrod V8 block designed by Ford, and it had a deck height over an inch (25 mm) higher than the Cleveland.
    Sounds like it was a stroked 351 Cleveland. I've had many Ford products but never one with an engine from that family, just previous V-8 models.
    I loved going to strip clubs; I actually made some friends there. Now things are different for the clubs and for me. As a result I am not as happy.

    Customers are not entitled to grope, disrespect, or rob strippers. This is their job, not their hobby, and they all need income. Clubs are not just some erotic show for guys to view while drinking.

    NOTE: anything I post here, outside of a direct quote, is my opinion only, which I am entitled to. Take it for what you estimate it is worth.

  10. #10
    God/dess Lena's Avatar
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    Default Re: mechanical advice?

    But it's a V6. I think...



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    Default Re: mechanical advice?

    maybe if its a diesel

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    God/dess threlayer's Avatar
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    Default Re: mechanical advice?

    6.6 liters is way bigger than Ford 6 cylinder engines go. (At least non-diesels.) Here's the list of 6s and 8s from that site. I do remember that engine which was built in an era when Ford's cars mainly used V8s.


    6 Cylinder
    • 1941-1996 Straight-6
    • 1941-1950 226 in³ Flathead
    • 1951-1996 OHV (215, 223, 170, 200, 240, 300, 250, 3.3, 4.9)
    • 1967-1988 British Essex V6 - 60° British V6 2.5/3.0 L
    • 1977-2007 Cologne/Taunus V6 - 2.0-4.0 L pushrod and SOHC V6
    • 1981-2004 Canadian Essex V6 - Windsor V8-based 90° V6, 3.8/3.9/4.2 L models
    • 1986-1990 Vulcan V6 - 60° pushrod V6 3.0 L, originally designed for the Taurus
    • 1989-1995 SHO V6 3.0/3.2 L DOHC V6
    • 1994-present Duratec DOHC 60° aluminum 4-valve
    • 1994-present Duratec 25 - 2.5 L
    • 2000-present Duratec 30 - 3.0 L
    • 2000-present Jaguar AJ-V6 - 3.0 L
    • 2005 Duratec 35 - 3.5 L

    8 Cylinder
    • 1932-1953 Flathead V8
    • 1954-1962 Y-block V8
    • 1962-1995 Windsor V8 small-block series: 221, 260, 289, 289HP, 302, 351W, Boss 302
    • 1963-1976 FE V8 big-block series: 352, 360, 390, 406, 410, 427, 428
    • 1968-1997 385 V8 big-block series: 370, 429, 460, 512
    • 1970-1982 335/Cleveland V8 small-block series: 351 Cleveland, 400M, 351M
    • 1991-present Modular V8 - DOHC 4.6/5.4 L V8
    • 2000-present Triton V8 - Truck version of the Modular V8
    • 1996-present Jaguar AJ-V8 - A smaller DOHC V8 also used by Lincoln LS and Ford Thunderbird
    • 1996-present Yamaha V8 - 60° V8 designed and produced with Yamaha Motor Corporation
    • 1996-1999 SHO V8 - 3.4 L
    • 2005 Volvo V8 - 4.4 L
    • Cosworth DFV - DOHC 3.0 liter racing engine, also BDG and BDA I4
    I loved going to strip clubs; I actually made some friends there. Now things are different for the clubs and for me. As a result I am not as happy.

    Customers are not entitled to grope, disrespect, or rob strippers. This is their job, not their hobby, and they all need income. Clubs are not just some erotic show for guys to view while drinking.

    NOTE: anything I post here, outside of a direct quote, is my opinion only, which I am entitled to. Take it for what you estimate it is worth.

  13. #13
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    Default Re: mechanical advice?

    i believe its a duramax diesel....thats explains the turbo and DI questions

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    God/dess threlayer's Avatar
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    Default Re: mechanical advice?

    The 6.6L duramax diesel is a GM product which wasn't around in 1989, I believe. Ford does have a 6.L diesel in current production coded Holland.
    I loved going to strip clubs; I actually made some friends there. Now things are different for the clubs and for me. As a result I am not as happy.

    Customers are not entitled to grope, disrespect, or rob strippers. This is their job, not their hobby, and they all need income. Clubs are not just some erotic show for guys to view while drinking.

    NOTE: anything I post here, outside of a direct quote, is my opinion only, which I am entitled to. Take it for what you estimate it is worth.

  15. #15
    God/dess Casual Observer's Avatar
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    Default Re: mechanical advice?

    i have no experience...but i did stay at a holiday inn express last night
    That is awesome. You outdid yourself that time, A.

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  16. #16
    God/dess AinNY's Avatar
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    Default Re: mechanical advice?

    Quote Originally Posted by Casual Observer
    That is awesome. You outdid yourself that time, A.

    <S>
    i try

  17. #17
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    Default Re: mechanical advice?

    holy shit dude, I just read that. Friggin hilarious.

    Did you save a bundle by switching to Geico?

    You rock.

    Can I have AinMast?
    People are not ruled by their memories.

  18. #18
    God/dess Lena's Avatar
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    Default Re: mechanical advice?

    Yeah, it is a diesel... in a school bus :-)



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