Pumapeople: Lightening A Flywheel - Pumapeople

Jump to content

Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic

Lightening A Flywheel Rate Topic: -----

#1 User is offline   bluezak 

  • Group: Members
  • Posts: 16
  • Joined: 25-January 13

Posted 30 November 2014 - 08:05 PM

Hi there, talking about my autograss puma yet again!

I am having my flywheel lightened and the guy who is doing the machining was asking whether the puma actually needs the notches where the crank sensor are. That's the part of the flywheel where he was going to start taking weight off but as my car is the only one at the track running on injection with the full ECU, the other cars with lightened flywheels are all fine as they are all on carbs so it doesn't matter chopping those bits. I have seen reading other threads that other people have lost up to 2kg on theirs. As my type of racing is all about acceleration, I need the flywheel to lose a good few lbs.

#2 User is offline   bluezak 

  • Group: Members
  • Posts: 16
  • Joined: 25-January 13

Posted 30 November 2014 - 08:14 PM

or is there a way to bypass the crank sensor. I don't need it to be road legal as the race car will never hit the road again.

#3 User is offline   Turby 

  • View gallery
  • Group: Moderators
  • Posts: 2133
  • Joined: 11-February 03
  • Location:On a racetrack somewhere

Posted 01 December 2014 - 01:16 PM

The crank is the only thing that lets the ECU know the engine is turning and hence it is a critical sensor.

I'd be seriously worried by the fact that the person doing the lightening doesn't know the importance of these notches.

The potential for lightning a flywheel wrongly has the potential to kill or seriously injure. There is a huge amount of energy stored in a flywheel - you don't want it exploding!

Sounds like you will be the guinea pig for this modified flywheel - are you comfortable with that ?

It might be worth buying one off the shelf from a turning company. Have a search on here.
A little knowledge is a dangerous thing (Alexander Pope - 1709)
Stop being spoon fed and GOOGLE it!

#4 User is offline   Fledge 

  • Group: Members
  • Posts: 196
  • Joined: 11-October 04
  • Location:Sheffield

Posted 07 December 2014 - 08:24 PM

I would go for steel flywheel rather than lightening a standard flywheel it's just to risky. Some rolling roads won't entertain you if you have got a lightened flywheel. Have you still got the video of your flywheel exploding turby ?
There are only two sports racing and bull fighting, the rest are just games

#5 User is offline   Turby 

  • View gallery
  • Group: Moderators
  • Posts: 2133
  • Joined: 11-February 03
  • Location:On a racetrack somewhere

Posted 08 December 2014 - 01:23 PM

An example of what happens when a standard flywheel is lightened by someone who thought they knew what they were doing

http://www.emcos.co....erton_2011.html
A little knowledge is a dangerous thing (Alexander Pope - 1709)
Stop being spoon fed and GOOGLE it!

#6 User is offline   ally frp364 

  • Group: Members
  • Posts: 760
  • Joined: 08-December 05
  • Location:kilmarnock

Posted 08 December 2014 - 11:05 PM

View PostTurby, on 08 December 2014 - 01:23 PM, said:

An example of what happens when a standard flywheel is lightened by someone who thought they knew what they were doing

http://www.emcos.co....erton_2011.html


OMG you were so lucky! There looks like a dodgy 1.7 one on Ebay just now selling with a clutch kit with all the crank sensors pickup points removed. Hop ethis doesn't happen to someone on here if they buy it.

#7 User is offline   johnpidge 

  • Group: Members
  • Posts: 202
  • Joined: 06-May 11

Posted 12 December 2014 - 02:39 PM

Blimey - bet that gave him brown trousers as well
John

#8 User is offline   Turby 

  • View gallery
  • Group: Moderators
  • Posts: 2133
  • Joined: 11-February 03
  • Location:On a racetrack somewhere

Posted 15 December 2014 - 01:25 PM

View Postjohnpidge, on 12 December 2014 - 02:39 PM, said:

Blimey - bet that gave him brown trousers as well


Nope, as I was pulling off the track I knew exactly what had happened - I was far too busy working out how much it was going to cost! It was a good job we decided to enter this last race of the season as it gave us the off season to repair it. If it had happened during the first race of the season, we would have only had 3 weeks to repair the damage which would not have been long enough.
A little knowledge is a dangerous thing (Alexander Pope - 1709)
Stop being spoon fed and GOOGLE it!

#9 User is offline   johnpidge 

  • Group: Members
  • Posts: 202
  • Joined: 06-May 11

Posted 15 December 2014 - 05:06 PM

ha ha - hope you fixed it then!!
John

#10 User is offline   cartledge 

  • Group: Members
  • Posts: 37
  • Joined: 30-March 13

Posted 29 August 2015 - 06:45 AM

There are some commercially available. To minimise risk.

TTV make some very nice ones for the puma.

Share this topic:


Page 1 of 1
  • You cannot start a new topic
  • You cannot reply to this topic