Rod Problems Rb25Det Neo.

[Upide]

Hello!

I'm rebuilding my rb25det neo engine. I'm thinking is my stock rods ok, if i change rod bolts to arp? But i have read some forums, if i use arp rod bolts, stock rods need machine? Can anyone know exactly what need do for rods? Can anyone have picture or something? Is the stock rods sufficient about max.600 hp power?

[iruvyouskyrine]

Stock rods will be fine. Search for R34_gee_tee_tee or Royce on these forums and have a read up. Plenty of people pushing huger power through Neos with decent reliability.

[Ben C34]

Stock fine.

The reason for having to re machine the rods due to arp bolts is the extra clamp load affects the way the rod and cap distort under clamping pressure.

Rods should be resized when uprating the clamping pressure, machined while clamped together with the bolts you are going to use. It's a tiny difference (it's not like the cap will move heaps) but on a serious build shouldn't be overlooked.

[KiwiRS4T]

^^^what he said. Rods themselves are identical to RB26.

[Upide]

Now i got the arp bolts. I check the rods, and i dont understand why the rod caps need machined. Can anyone help me, and send picture for what is the marked what is the exact area what neew machined and how much?

[Ben C34]

Now i got the arp bolts. I check the rods, and i dont understand why the rod caps need machined. Can anyone help me, and send picture for what is the marked what is the exact area what neew machined and how much?

Did you read what I wrote?

Obviously not.

[discopotato03]

What the machine shop does is hone inside the big end of the rods with the caps bolted on and torqued up . The rod and cap mating surfaces can be faced to close the bore up slightly so when honed it is perfectly round in a "fitted" state .

A .