(02-01-2017 )Texasdude74 Wrote:  I have heard stories of people claiming their Cat platinum kit contained resurfaced liners and cleaned up pistons. If true, Brock has got the right idea. $11,200 for a platinum kit with the only new parts being the head, rings and bearings is insane. Re-honed liners, resized rods with cleaned up pistons? How much could that cost?

(02-01-2017 )Rig Wrench Wrote:  

(01-31-2017 )RPM1 Wrote:  

(01-31-2017 )Rig Wrench Wrote:  

(01-30-2017 )Brock Wrote:  Front structure is off, deck is getting cleaned off. Got all my parts in.... went with the federal mogul FP diesel cylinder kits, cat everything else including head and injectors.

Here's a pic of the new piston




Went with the FP diesel cause they are new rather than reman and have a ceramic coating which I really like.


Cylinders going in today!

I've been havin the pistons cut in my high compression engines used in more heavy haul (100k+lbs) applications, cat and cummins. Just for extra insurance. I feel it helps some with heat and cylinder pressure, helping head gaskets. Haven't had any negative effects yet....

if u are cutting your pistons to reduce compression , depending how much your taking off , u should have your whole rotating assembly re balanced , u could also just reduce your boost
cylinder presser is the key , higher compression less boost and vice versa , to a point that is

I understand what your saying, but Cat is not con concerned with parts being balanced at all. If you have ever weighed the part in a reman kit, they are soo far out its pathetic. One benefit of cutting the pistons is that they are always closer in weight, when done they are within an ounce of each other. I've had cat pistons be 8-12 ounces off from each other out of the box. When volume is measured it can cause compression to be a point to 2 points off. I have not had these issues with cummins though. The pistons are new and generally very close.

(01-19-2017 )Brock Wrote:  The motor was rebuilt 2 years ago. Truck has mandate disabled and a tune out of spec Quebec.

Problem I see.... Truck has 336 gears on 24.5 rubber so at 65mph it's turning 1250rpm. I do that so I can run a gear down in direct and cruisearound 1450rpm. Problem is my driver always runs top gear, I know he does and I've told him not to.I only know cause he's told other drivers when they were asking how he got such good mileage.

I've now taken this truck back as my own and hired a driver who takes direction. I'm swapping my 24.5 with the 22.5 from my prostar as well to bring my direct to 1500rpm and drop my prostar from 1600 closet to 1500.

(02-01-2017 )justdoug Wrote:  

(01-19-2017 )Brock Wrote:  The motor was rebuilt 2 years ago. Truck has mandate disabled and a tune out of spec Quebec.

Problem I see.... Truck has 336 gears on 24.5 rubber so at 65mph it's turning 1250rpm. I do that so I can run a gear down in direct and cruisearound 1450rpm. Problem is my driver always runs top gear, I know he does and I've told him not to.I only know cause he's told other drivers when they were asking how he got such good mileage.

I've now taken this truck back as my own and hired a driver who takes direction. I'm swapping my 24.5 with the 22.5 from my prostar as well to bring my direct to 1500rpm and drop my prostar from 1600 closet to 1500.

If this is a 13 or 18 speed,you do know that "one gear down" is still overdrive and not direct,right? 2 down is direct,1 down is .86 over,top is .73

(02-01-2017 )Rig Wrench Wrote:  Same way you would the combustion chamber in a gas cylinder head. Just now you do it to the piston
https://m.youtube.com/watch?v=yqAr4DUqEt4