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    • Manthey Racing releases 4.4 liter 997 GT3 engine with 530 horsepower

      If you are not familiar with Manthey Racing or Manthey Motors here is some background information. Their Porsche motors have won the 24 Hours of Le Mans and the 24 Hour of the Nurburgring a combined 7 times. That is about as good as a resume for an engine builder is going to get and when it comes to Porsche GT3 engine building and racing Manthey is as elite as they come. Say hello to their new 4.4 liter motor available for 997 GT3 models equipped with the GT1 racing block.


      Manthey can build a 4.4 liter with a 3.6 liter, 3.8, or even 4.0 base. It likely makes the most sense to start with a 3.6 liter motor as in the 997.1 GT3 model where the largest gains will be seen. The 3.6 starts out at 415 horsepower to gains of 115 at the crank are possible. Torque figures rise roughly 60 pound-feet. These numbers will obviously change when starting with a 3.8 or 4.0 engine base.

      When racing in a naturally aspirated motor class every horse and pound-foot counts. For the serious road course junkies as well as those who just want more out of their 997 GT3 Manthey provides a tried and true tested 4.4 liter flat-6 solution. This is the best way to get significantly more power and torque out of the already high strung GT3 motor without seeking forced induction.

      Press release below.


      This article was originally published in forum thread: Manthey Racing releases 4.4 liter 997 GT3 engine with 530 horsepower started by Sticky View original post
      Comments 25 Comments
      1. fastgti69's Avatar
        fastgti69 -
        4.4 liter flat six. Naturally aspirated sex.
      1. Sticky's Avatar
        Sticky -
        This is as good as it gets. Short of a 4.6 liter S65... Click here to enlarge
      1. fastgti69's Avatar
        fastgti69 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        This is as good as it gets. Short of a 4.6 liter S65... Click here to enlarge
        Meh, I'll take this engine/car over a blown m3. The s65 is a great motor and all. Porsche is just that much better...
      1. TT C6's Avatar
        TT C6 -
        A LS7 conversion from Renegade Hybirds should be the only choice over this.
      1. S62R's Avatar
        S62R -
        Click here to enlarge Originally Posted by TT C6 Click here to enlarge
        A LS7 conversion from Renegade Hybirds should be the only choice over this.
        Seriously?

        Rather FI the engine.

        I still do not understand why people put V8 in 911s....

        Replace one of the best engine built in the last 2 decades with some push rod engine..

        Brilliant idea!

        I take Olaf's engine in a 997GT3 any time of the day over any BMW with n/a engine.
      1. StinkyM's Avatar
        StinkyM -
        I second that notion. There's something special about the GT3.
      1. TT C6's Avatar
        TT C6 -
        Click here to enlarge Originally Posted by S62R Click here to enlarge
        Seriously?

        Rather FI the engine.

        I still do not understand why people put V8 in 911s....

        Replace one of the best engine built in the last 2 decades with some push rod engine..

        Brilliant idea!

        I take Olaf's engine in a 997GT3 any time of the day over any BMW with n/a engine.
        Are YOU serious?
        If you are going to add FI to a GT3, you might as well just buy a 911 Turbo.
        I HATE rear engine and Porsche pricing, but even I respect the Turbo PDK.

        You obviously know nothing about LSx engines that are far superior to the pathetic naturally aspirated engines from Porsche.
        Replacing a Porsche N/A engine with a LS7 isn't brilliance, it's common sense.
        Don't even get me started on what you can do with a custom built LSx engine.
      1. S62R's Avatar
        S62R -
        I am serious...

        Thanks for playing,nice try....
      1. benzy89's Avatar
        benzy89 -
        Click here to enlarge Originally Posted by TT C6 Click here to enlarge
        Are YOU serious?
        If you are going to add FI to a GT3, you might as well just buy a 911 Turbo.
        I HATE rear engine and Porsche pricing, but even I respect the Turbo PDK.

        You obviously know nothing about LSx engines that are far superior to the pathetic naturally aspirated engines from Porsche.
        Replacing a Porsche N/A engine with a LS7 isn't brilliance, it's common sense.
        Don't even get me started on what you can do with a custom built LSx engine.
        The LS7 has about double the displacement, so strictly evaluating the motor it should be a lot more powerful. But the motors are for two completely different purposes -- Ones a bomb street motor, the other is racing motor that's been placed in a street car; just look at the redline differences.

        If you take a GT3 and completely ruin it by putting in an LS motor, you should be dragged through hot coals & razor blades, pissed on, and then stoned to death. Save Porsche-LS swaps for Carreras.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
        Meh, I'll take this engine/car over a blown m3. The s65 is a great motor and all. Porsche is just that much better...
        I didn't say blown.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by TT C6 Click here to enlarge
        Are YOU serious?
        If you are going to add FI to a GT3, you might as well just buy a 911 Turbo.
        I HATE rear engine and Porsche pricing, but even I respect the Turbo PDK.

        You obviously know nothing about LSx engines that are far superior to the pathetic naturally aspirated engines from Porsche.
        Replacing a Porsche N/A engine with a LS7 isn't brilliance, it's common sense.
        Don't even get me started on what you can do with a custom built LSx engine.
        Not everyone wants an LS in everything thanks so much.

        This isn't a car designed for drag racing. This isn't a PDK turbo. This is a race car engine. Thanks so much.
      1. TT C6's Avatar
        TT C6 -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        Not everyone wants an LS in everything thanks so much.

        This isn't a car designed for drag racing. This isn't a PDK turbo. This is a race car engine. Thanks so much.
        Who mentioned drag racing?
        The LS7 ZO6 comes with a dry sump oiling system and carbon ceramic brake option.
        Does that sound like a drag car to you? Click here to enlarge

        Hey, if you want an inferior engine, don't go with a LSx.

        Race car?
        Like your barely 10 second M3? Click here to enlarge
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by TT C6 Click here to enlarge
        Who mentioned drag racing?
        The LS7 ZO6 comes with a dry sump oiling system and carbon ceramic brake option.
        Does that sound like a drag car to you? Click here to enlarge

        Hey, if you want an inferior engine, don't go with a LSx.

        Race car?
        Like your barely 10 second M3? Click here to enlarge
        Does it now? What a revelation. Dry sump? Yet it races with a 5.5 liter doesn't it? The GT3 is the closest to its actual race car sibling.

        Nobody cares about putting an LS7 in one. Seriously, GT3 buyers do not care. The Porsche racing program does not care. Nobody cares. Swap an LS into your blender if you want. NOBODY CARES.

        OK barely 10 second. Right on.

        Take a 10 day vacation.
      1. S62R's Avatar
        S62R -
        Race car like in 997 Gt3 R and RSR for example or their smaller cousins the GT3 Cup cars...

        These engines are so $#@!ty they can take over 10k RPM while down shifting and have over 120BHPl output...
      1. Stevenh's Avatar
        Stevenh -
        Please correct me if I'm on wrong, but the LS7 initially had a HUGE issue with oil starvation in high speed left handers that was toasting motors at an alarming rate. Was this ever corrected? You could put the Metzger in a damn roller-coaster and run it at redline all day long with zero issues. It was designed for high G's, built on a race track and then moved to a street car. The LS7 is a great motor and can make huge power, but it was designed with much different initial goals and these shortcomings have shown up when the envelope is pushed.
      1. Sticky's Avatar
        Sticky -
        Click here to enlarge Originally Posted by Stevenh Click here to enlarge
        Please correct me if I'm on wrong, but the LS7 initially had a HUGE issue with oil starvation in high speed left handers that was toasting motors at an alarming rate. Was this ever corrected? You could put the Metzger in a damn roller-coaster and run it at redline all day long with zero issues. It was designed for high G's, built on a race track and then moved to a street car. The LS7 is a great motor and can make huge power, but it was designed with much different initial goals and these shortcomings have shown up when the envelope is pushed.
        Don't waste your time trying to make a logical argument with that guy. Here, let me respond for him since he can't:

        "LOL you Euro douchebags don't know anything. I SPOKE WITH THE CORVETTE ENGINEERS. They told me while I was blowing them how great their motor is.

        If only the Corvette had DCT and all wheel drive because anything without all wheel drive is for morons. YOU'RE ALL EURO DOUCHEBAGS LOL THE GT3 DOESN'T EVEN RUN 10's. Idiots."
      1. Stevenh's Avatar
        Stevenh -
        I guess he can read these while in time-out:

        http://forums.corvetteforum.com/c6-z...hard-data.html
        http://forums.corvetteforum.com/c6-z...r-correct.html

        You'd think American's would have the 'go-fast, turn left' thing down, right?

        Back to the subject at hand; Porsche was able to achieve 500hp out of 4.0l. I would think a 10% displacement increase would net at least 50hp. Was this all stroke and made up at the bottom end? I'd love to see dyno's of the two overlayed.
      1. Puerto Rican 335d's Avatar
        Puerto Rican 335d -
        Damn that carbon fiber intake the way it looks , means DONT $#@! with me!!!
      1. Sticky's Avatar
        Sticky -
        For those interested pricing is here: http://www.manthey-motors.de/nextsho...df.asp?id=1288

        47,800 Euros...
      1. StinkyM's Avatar
        StinkyM -
        Click here to enlarge Originally Posted by Sticky Click here to enlarge
        For those interested pricing is here: http://www.manthey-motors.de/nextsho...df.asp?id=1288

        47,800 Euros...
        Annnnnnnd back to reality.