Is This Okay..?

[nissan200sx.dk]

My question is more on the way its fitted.. If it needs a pin throgh it, to be sure it wont spin on the crank.

Now its mounted this way: crank was cold shrunk, collar heated to 100 degress, both parts degreesed, special glue, VERY strong and will hold up to 150 degrees, still needed 2 tons to be pressed on. (No I did not press 2 tons down on entire crank, a metal bar was fitted just down under the first counter weight.)

Question is, do you think it will stay on and not spin round the crank. I dont know how much force there is trying to twist it around the crank.... How hard the oil pump is to drive..?

[Adriano]

I would say it will stay on no worries, however it isnt a big job to put an M5 grub screw bottomed into the crank with loctite, then there is no way it can spin

[nissan200sx.dk]

Problem is, its hardned to Rockwell C 36, so hard to make a hole in now.. I know, should have asked this first. My mistake..

[rob82]

Rule of thumb from an old engineer when they used to press on drive sprockets. A 2 thou tolerence fit on a 1 inch pipe 1 inch wide will drive 40hp.

[Adriano]

  rob82 said:

Rule of thumb from an old engineer when they used to press on drive sprockets. A 2 thou tolerence fit on a 1 inch pipe 1 inch wide will drive 40hp.

Thats an interesting rule of thumb when you think about it, as HP doesnt have anything to do with it does it!

[sh@un]

not quite

driving the pump gear will absorb some power- but no, not anywhere near 40hp

[rob82]

  Adriano said:

Thats an interesting rule of thumb when you think about it, as HP doesnt have anything to do with it does it!

If you know the required rpm it does.

[MBS206]

  Adriano said:

Thats an interesting rule of thumb when you think about it, as HP doesnt have anything to do with it does it!

It's to do with torque and how much pressure is being created outwards on the outer surface with the interference fit.

[rob82]

  MBS206 said:

It's to do with torque and how much pressure is being created outwards on the outer surface with the interference fit.

Your getting closer - you'll get it soon.

[Adriano]

So now all we need to know is how much torque is required to drive the oil pump at redline when the oil is cold, and see if that is greater thatn the breakaway point of the interference fit.