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  • Results 1 to 13 of 13
    1. #1
      
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      Hakuna Matata's Avatar
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      What are the RPM limiting factors ??


      in my opinion, it's longer stroke and valve springs... also manifold and vents are responsible for it.. I'll discuss in details later..


      what do you guys think? share...

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      so let's talk about long stroke.. as for an example I'll discuss toyota corolla sedan with 1.3L in-line 4 cylinder engine...

      bore x stroke: 72.5 x 80.5

      80.5 mm long stroke with max rpm of 8000 means that 1 piston is travelling 1.288 kilometers in just 1 minute.. and altogether these four pistons travel a distance of 5.152 kilometers.. which is a heck of a travel for the small skirts of pistons that bears the friction and heat in combustion chamber.. so limiting it to a safe red line is important to ensure & secure its longlife... if somehow it crosses the redline, results will be fatal..

      that is why heavy engines with larger strokes have low rpm, ship's engine have like 200-300 rpm only... trucks dont exceed 3000's redline...


      Note: engines with high rpm like 15000-18000 have much more shorter strokes.. as an example Yamaha YZF-R1 have a redline of 14500.. which was previously 13750.. it's cylinder bore has increased to 79.0 mm (up from 78.0) while stroke measures 50.9 mm (was 52.2 mm), also compression has been bumped to 13.0:1 from 12.7:1 which shows significant effect on RPM by changing bore to stroke ratio..
      Last edited by Hakuna Matata; May 29th, 2017 at 12:43 PM.

    3. #3
      K. in the North..
       GS Director


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      SID_NY's Avatar
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      Hakuna, it totally sounds German to me..


      Itna parha likha hota to yahan hota?!
      Winners focus on winning... Losers focus on winners.

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      Quote Originally Posted by SID_NY View Post
      Hakuna, it totally sounds German to me..


      Itna parha likha hota to yahan hota?!
      lol, fasten your seat belt pyare bhai..

    5. #5
      
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      "Valve Springs"

      Retainers are the most important part of the engine that regulates the actual red-line.. the maximum limit of RPM means that retainers/valve springs are lacking the engine rotational speed i-e rotary motion of crankshaft is out-running spring's elastic/retaining speed.. that results in uncombustible strokes.. at first it can cause missed fires than gaining back the limit with max HP and lesser torque.. the fact that strokes going in vain are actually caused by these two things, valves remain opened during firing stroke and the mixture of burnt air-fuel and un-burnt one.. though non-ideal mixture of burnt and un-burnt fuel can lit up and result in a less proportioned power stroke, but, valve with open seats fails it all the way..


      P.S: more powerful springs can increase your RPM, but stock retainers are more safe for your engine's capacity..

    6. #6
      
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      "Manifold & Vent"

      In every type of engine whether it's 4 stroke, 2 stroke, rotary, radial or jet engine.. there are 2 main parts which are Intake and Exhaust... Intake manifold is the passage from where air-fuel mixture passes into the combustion chamber... and exhaust vent or port is the passage from where burnt air-fuel mixture releases into the air through silencer...

      Their sizes play a vital role in managing or taking the RPM to it's limit... Basically both of these passages are ports-like structure that opens into the cylinder part of an engine... Large port means easy & quick conveying of air-fuel mixture into the chamber, the bigger the size of ports results in chamber easily filled up to 100% in lesser time i-e at higher RPMs.. When RPM reach it's max limit, sometimes smaller ports fails to pass mixture into the chamber that results in missing and vacuum in ports... So, in-short bigger ports help engine breath easily and swiftly...

      Note: Back-pressure.. I've heard people saying that replacing a larger tube in muffler will make your engine work hardly/roughly and make it's life shorter... To them all, this is not more than a joke... Infact it will help it work more efficiently and smoothly...

    7. #7
      
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      Quote Originally Posted by Hakuna Matata View Post
      "Valve Springs"

      Retainers are the most important part of the engine that regulates the actual red-line.. the maximum limit of RPM means that retainers/valve springs are lacking the engine rotational speed i-e rotary motion of crankshaft is out-running spring's elastic/retaining speed.. that results in uncombustible strokes.. at first it can cause missed fires than gaining back the limit with max HP and lesser torque.. the fact that strokes going in vain are actually caused by these two things, valves remain opened during firing stroke and the mixture of burnt air-fuel and un-burnt one.. though non-ideal mixture of burnt and un-burnt fuel can lit up and result in a less proportioned power stroke, but, valve with open seats fails it all the way..


      P.S: more powerful springs can increase your RPM, but stock retainers are more safe for your engine's capacity..

      Done an experiment, installed weak retainers with 4 thousandths clearance in valve guides... 1/4th of the RPMs decreased...

    8. #8
      
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      In addition, there is another way to increase or atleast reach maximum RPMs, and that is by boosting up the air pressure in chamber, more air(oxygen) means more power... Turbo-chargers(TC) and Super-chargers(SC) can help you do that... The main difference between two is TC is driven by the exhaust gases pressure and results upto 40% increased power whereas SC can get you maximum of 25% more power because they are driven by belt attached to engine and therefore consumes 15% of engine's power...

      Note: Approximately all engines are only 85%(max) efficient because in every in-take stroke only 85% (of total volume) air is sucked into the chamber...


      P.S: Not only turbos but air boosters, air compressors & pneumatic air pumps can also do the work...

    9. #9
      
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      Extended Throttle Plate/Body...

      it helps to easily increase your RPM limit to 2000-3000.. because stock throttle bodies lean at a standard & safely calculated displacement... so when you cut it to nearly 1-2 mm, it excites air to take more gas/fuel into the chamber...


      P.S: just did it, now enjoying engine's lovely sound at peak..

    10. #10
      
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      NOS/Nitric Oxide System..

      just install NOS on your vehicles and enjoy the unlimited power with exploding RPMs.. it works as a catalyst.. increases combustion thus producing more power and heat.. so you must use better cooling system to avoid overheating of an engine..

    11. #11

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      Dhoti Main Dhamaka's Avatar
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      Aww look at the poor fella...been talking to himself since may 30th
      keep it up bro
      پورا مسلمان خود نہیں اور مجھے کافر کہتا ہے

    12. #12
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      SaeedinPakistan's Avatar
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      Koi nahi. Hum bhi a gaye party me.

    13. #13
      
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      hain?? gai bhains pani me... ye Article hai cafe nahi


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