bringing a 255 cup back to life

General General Lotus Talk
1

friend of mine had the engine let go during a race last year. the car’s been sitting under a cover until the last few days and suddenly it’s time to get it going again. very initial check says zero pressure in cylinder 3 but the others are ok. not known at this stage whether there is head damage due to possibly broken piston. owner thinking of a rebuild, and bigger power: 300+ to run in local GT series.

suggestions as to :

  • rebuild: pistons, s/c setup, map, etc.
  • drivetrain especially gearbox: seems a quaife sequential is not as expensive as it used to be.
2

can you get a Quaffe sequential for the Yota? How much ?

Thanks

Ex77

3

apparently yes, and it’s 6k which is a lot less than i thought.

4

A short list for the moment.

Darton Steel liners
Mahle or Wiseco pistons
Circuitworx oil pump
Crower rods
Decent valve springs

this would be a good start, if you are keeping with the MP62 SC don’t use too lower compression pistons :wink: with a 2.6" pulley and a decent charge cooler you should see 350hp+

5

thanks for the info - I’ll pass it along. around 350bhp would be ideal to be competitive in that class.

actually, i’ll see if i can get him to sign up here himself so i don’t wind up batting info over and back.

6

update :

looks like the head is actually ok but bottom end thrashed - presumably due to flailing conrod and bits of piston.

now thinking of boring out, going with oversized pistons.

7

Wisdom seems to be that there isn’t enough material between the bore to go oversize. You might be able to machine and sleeve to standard size. Working through options for a build myself so interested in what you decide to do.