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  1. #1
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    Why no Kenne-Bell supercharger swaps on the E55 or any of the 55's?

    The W211 E55 AMG uses a positive displacement blower. Why hasn't anyone tried a kenne bell twin screw? Would be more efficient, larger, and make more power.

    It isn't as simple as simply strapping it on but it is surprising this has not happened yet.

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    1 out of 2 members liked this post. Reputation: Yes | No
    bunch of vaginas own those cars and dont know how to turn a wrench

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    Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
    bunch of vaginas own those cars and dont know how to turn a wrench
    It does tend to be older guys but some of them are pretty hardcore.

    I'm really surprised we haven't seen or heard anyone go down this route yet.

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    Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
    bunch of vaginas own those cars and dont know how to turn a wrench
    Damn you called it....aren't you trying to trade your trailblazer for one?

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    traded for a 335! But i want to trade for a e55... Maybe a whipple on a e55?

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    I hate to say this but twin turbo the E55 will be easier than try to retrofit the KB unit the E55 engine bay.

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    Click here to enlarge Originally Posted by Forrest Gump 9 Click here to enlarge
    I hate to say this but twin turbo the E55 will be easier than try to retrofit the KB unit the E55 engine bay.
    Why is that? Are you saying because of spacing?

    The current blower takes up a good amount of space, I don't see why the KB would not fit in its place.

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    Click here to enlarge Originally Posted by Sticky Click here to enlarge
    Why is that? Are you saying because of spacing?

    The current blower takes up a good amount of space, I don't see why the KB would not fit in its place.
    Because MB have part of the intake runner and boost by-pass built into the SC. Not to metion the electronic control SC clutch. I guess all of those could be retro-fit.

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    Click here to enlarge Originally Posted by Forrest Gump 9 Click here to enlarge
    Because MB have part of the intake runner and boost by-pass built into the SC. Not to metion the electronic control SC clutch. I guess all of those could be retro-fit.
    Those could be bypassed, sure. The hard part I guess would be making the ECU understand what was done. I don't think spacing would be a problem though.

    Still, obviously pretty complex.

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    You guys realize the stock blower is a twin screw lysholm blower just like a KB? The whole point of switching blowers on other positive displacement cars like a Cobra is because they are usually eaton "roots" style. Twin screw blowers internally compress the incomming air and do not require the rest of the intake tract to pressurize, make boost more instantyl and allowing for higher efficiencies and higher boost. Unless you are talking about using larger 2.6 blowers for more volume of CFM, wich could make lots of power, but would not fit easily at/if at all.

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    Click here to enlarge Originally Posted by KLR CLS Click here to enlarge
    You guys realize the stock blower is a twin screw lysholm blower just like a KB? The whole point of switching blowers on other positive displacement cars like a Cobra is because they are usually eaton "roots" style. Twin screw blowers internally compress the incomming air and do not require the rest of the intake tract to pressurize, make boost more instantyl and allowing for higher efficiencies and higher boost. Unless you are talking about using larger 2.6 blowers for more volume of CFM, wich could make lots of power, but would not fit easily at/if at all.
    Thanks for the background info, but most of us already know that. The idea would obviously be to use a larger KB blower than anything that the motor has currently seen.

    That really raises the main question, why wouldn't it fit easily or at all?

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    I didnt know these blowers had clutches, that would pose an issue if the ECU is looking for this device and how to control it; and it isn't there.

    KB blower would be nice to have on a MB, german engineering with american brute force combined under the hood is pretty cool.
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    Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    I didnt know these blowers had clutches, that would pose an issue if the ECU is looking for this device and how to control it; and it isn't there.
    Yep, that is likely the hardest part.

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    Click here to enlarge Originally Posted by KLR CLS Click here to enlarge
    You guys realize the stock blower is a twin screw lysholm blower just like a KB? The whole point of switching blowers on other positive displacement cars like a Cobra is because they are usually eaton "roots" style. Twin screw blowers internally compress the incomming air and do not require the rest of the intake tract to pressurize, make boost more instantyl and allowing for higher efficiencies and higher boost. Unless you are talking about using larger 2.6 blowers for more volume of CFM, wich could make lots of power, but would not fit easily at/if at all.

    You know that a roots blower is any blower that mounts to the top of the cylinder heads correct! The stock eaton blower on a 03 cobra and a ford lightning is also a twin screw blower. It has two screw type props in them that produce boost.

    here notice the two bulges Click here to enlarge


    Single screw superchargers exist. they have one prop in them. All 03-04 cobras have twin screws stock. and all 1998-2004 lightings do aswell

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    Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
    You know that a roots blower is any blower that mounts to the top of the cylinder heads correct! The stock eaton blower on a 03 cobra and a ford lightning is also a twin screw blower. It has two screw type props in them that produce boost.
    Bud, he's right though there is a distinction as even though a roots has screws it creates boost externally not internally, so there is a need to designate.

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    Yeah we're both RIGHT lol

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    Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
    Yeah we're both RIGHT lol
    Not exactly, you can have a roots that isn't on top of the cylinder heads.

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    Twin screw blowers and roots blowers function differently... They are different designs.

    Twin screw blowers are essentially roots blowers with a helix angle. This helix angle helps raise efficiency and compress the air inside the blower housing. Roots blowers have straight lobes.
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    Click here to enlarge

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Twin screw blowers and roots blowers function differently... They are different designs.

    Twin screw blowers are essentially roots blowers with a helix angle. This helix angle helps raise efficiency and compress the air inside the blower housing. Roots blowers have straight lobes.
    Yes, exactly, they are different and it is important to point it out.

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    Click here to enlarge Originally Posted by DBFIU Click here to enlarge
    Twin screw blowers and roots blowers function differently... They are different designs.

    Twin screw blowers are essentially roots blowers with a helix angle. This helix angle helps raise efficiency and compress the air inside the blower housing. Roots blowers have straight lobes.
    Twin screw does not matter what angle the blades are but again stock cobra blowers are not straight lobes they have helix angle

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    Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
    Twin screw does not matter what angle the blades are but again stock cobra blowers are not straight lobes they have helix angle
    The stock cobra uses an Eaton roots regardless so the point stands that they make more power even at the same boost switching to a KB due to it being a more efficient twin screw.

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    Correct its more efficient because of the displacement

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    Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
    Correct its more efficient because of the displacement
    It's more efficient because it compresses air internally.

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    a eaton compress's air internally aswell

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    Click here to enlarge Originally Posted by 600whp S4 Click here to enlarge
    a eaton compress's air internally aswell
    Eaton roots blowers do not. You have been really, really off in this thread:

    Roots superchargers are typically external compression only (although high-helix roots blowers attempt to emulate the internal compression of the Lysholm screw).

    External compression refers to pumps that transfer air at ambient pressure into the engine. If the engine is running under boost conditions, the pressure in the intake manifold is higher than that coming from the supercharger. That causes a backflow from the engine into the supercharger until the two reach equilibrium. It is the backflow that actually compresses the incoming gas. This is a highly inefficient process, and the main factor in the lack of efficiency of Roots superchargers when used at high boost levels. The lower the boost level the smaller is this loss, and Roots blowers are very efficient at moving air at low pressure differentials, which is what they were first invented for (hence the original term "blower").

    All the other types have some degree of internal compression.

    Internal compression refers to the compression of air within the supercharger itself, which, already at or close to boost level, can be delivered smoothly to the engine with little or no back flow. This is more efficient than back flow compression and allows higher efficiency to be achieved. Internal compression devices usually use a fixed internal compression ratio. When the boost pressure is equal to the compression pressure of the supercharger, the back flow is zero. If the boost pressure exceeds that compression pressure, back flow can still occur as in a roots blower. Internal compression blowers must be matched to the expected boost pressure in order to achieve the higher efficiency they are capable of, otherwise they will suffer the same problems and low efficiency of the roots blowers.

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