20bfd3s

i`ve got into trouble with custom 3 rotor crankshaft that i bought in NZ.
they had broken grinding machine and crank was made with rotor lobes deviation. lobes are not parallel with the shaft center line.

i could try to polish it here but i need to know minimum acceptabe lobe diameter.

more exactly: what is the maximum rotor bearing to eccentric shaft clearance in high performance engine?

anyone knows?

speedturn

iTrader: (1)

For hi-rpms, only .001" more clearance is used. If you are out more than that, sounds like you are screwed

20bfd3s

thats bad.. its out much more than that. have to send that crank back now.
it took more than 6 months to get it and nobody knows how long more now to get a replacement

thanks...

t-von

iTrader: (8)

Damn 6 months to wait for that custom shaft?

20bfd3s

yeah... i also ordered rotors lightening and balancing, all of that took even more than 6 months..
is there any source in US for the custom short 3 rotor cranks?

t-von

iTrader: (8)

^ Not to my knowledge. Would be nice if we did.

crispeed

Stock is around--------> 0.002 in
High performance up to 8500rpm---->0.0025 min to 0.0035 max
Full race 8500rpm + ---------> 0.00375min to 0.00425max

PDF

I believe the cranks that were ground incorrectly (out sourced work not manufacturers fault) have been recalled.

20bfd3s

yes i`ve got a request to send it back. hopefully i have not installed it yet.
but problem is time.. in 1 month we will have main competition here and now it looks complicated to get new crank back, assemble everything and tune in time...


Thanks crispeed, valuable info.
but i will have even more clearance if i process it here.
so no other choice - sending it back with HOPE to get new one rapidly.