S21: Silverstone


  • Please log in to reply
23 replies to this topic

#21 Bob Simpson

Bob Simpson

    The Answer Man

  • VOR Admins
  • 4,550 posts
  • Gender:Male
  • Location:Ottawa

Posted 27 May 2018 - 08:56 PM

View PostBaldassarri, on 27 May 2018 - 08:13 AM, said:

Here is my Repco random failure summary:

-  water temperature: 87° C
-  max engine rotational speed: approximately never exceeded 8900 rpm

ciao
rob

The redline of the Brabham should be 8,200 RPM according to the specs in GPL.
Bob Simpson
VOR GPL Race Series Manager

#22 Baldassarri

Baldassarri

    Member

  • Members
  • 41 posts
  • Gender:Male
  • Location:Roma
  • Interests:Gpl, slot_racing, books, windsurf

Posted 28 May 2018 - 06:21 PM

Hi Bob,

Thanks for the clarification. There is the possibilty that I Always failed till now.  However, in my opinion the following holds:

-  For Repco 8200 rpm is the revs at which the max power is released.  It is not said that at higher revs the engine is damaged
-  Usually the power curve exhibits significat values (decreasing) even Beyond the revs at which the max is, up to the very ultimate revs allowed
-  looking at the old Nunnini notes for the GPL engines, it seems that for Repco the ultimate revs allowed (in safety) is 8750.  
-  In any case I failed during the race since I took approximately 1 tick before the red line on the rpm counter, which is located at 9000 rpm, then exceeding the max allowed
-  The strange thing is that despite the above the water temp was quite low and that usually the random failures occur early. In this my case leaving few laps to the flag

Regards
roberto

Edited by Baldassarri, 28 May 2018 - 06:28 PM.


#23 snafu

snafu

    Senior Member

  • Members
  • 904 posts
  • Gender:Male
  • Location:Hall End England
  • Interests:GPL
    F2B (Control Line aerobatic model aircraft).
    Motorcycles
    Crown Green bowling

Posted 28 May 2018 - 06:32 PM

Just a general question.. Running a "real" engine hard from a cold start isn't considered good practice.

Is there any perceived benefit to running the engine up the rev band on the line to speed up the rise in temps or doesn't GPL take (Cold) temps into consideration against the life of the engine?

TTFN
John.
I started out with nothing and still have most of it left.

Fast, Cheap, Reliable. Choose any 2.

Beat it to fit, paint it to match..

#24 Robert Fleurke

Robert Fleurke

    Senior Member

  • Members
  • 1,839 posts
  • Gender:Male
  • Location:Groningen
  • Interests:Life

Posted 29 May 2018 - 04:42 AM

To be sure I do warm up the engine a bit before the start on the line, but I'm not sure if it's modelled in GPL.




Sim Racing Links