Rb25 Engine Bore Mesurment

[britz1]

Ok just a quick one...

im assembeling a rb25 at the moment and are coming across some issues with the bore out of round....

the cp spec sheet states 0.003mm max out of round.... i am measuring 0.03mm out of round in some bores.... should i be sending it back to the machinist? and dose a Torque plate make much of a diference? as i dont have one.

BTW im using a dial bore guage with a micrometer to reference it.

[rbs30]

Everything I have ever seen from Cp is imperial. Sure its not .003 inch?

[JustinP]

Yes CP supplies all measurements in inches. From memory I think they specify that the bore must be less than 0.0002" out of round.

[rbs30]

Just had a look at a Cp spec sheet. You are right. .0002. So .005mm. 03 is a long way to be out with a hone. Take it back.

[KiwiRS4T]

Are you using stock sized pistons or have you had a rebore to the next size?

[Dobz]

The bore will be out of round without a head or torque plate tensioned down. Measure where the high and low spots are, mark them and see if there's a pattern. From what i understand the low spots should all be inline with all the cylinders.

Edited October 25, 2012 by Dobz