Truckers, lets see your rigs!

[jfaulkner]

We’ve used PDI and Full Tilt and up until PDI started using Cummins seals (instead of being press fit) they were almost identical. The slip seals are a way better design.

[BRE]

I had intended on using a full tilt if ours ever needed/got one.


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[RockinRam96]

Originally Posted by jfaulkner

At first I liked them because it could be ordered with an external wastegate port. However his cocky attitude about how awesome they are online, and he blew off any concern Cody had about breaking studs. There’s no joints so the entire manifold grows when it gets hot. Seems like a great recipe for broken studs. Also it was flow tested and was worse than a stock manifold. Pdi offers an extrude honed version of their manifold and will admit it’s only good for a few HP IF your well above 1000hp. Steed was making Leiffi sized HP claims on his.

If manufactured properly (stud holes being drilled to proper size) and studs and spaces are used wouldn't there be enough room for thermal expansion? Are the joints needed in something like a steed?

I always questioned why a Cat used studs, spaces and nut and not bolts like a Cummins (855). I was told the studs, spacers and nuts allow the manifold to grow, expand and move with heat and vibration.

EDIT: Not questioning your concerns, just looking for your thoughts and opinions.

[jfaulkner]

Originally Posted by RockinRam96

If manufactured properly (stud holes being drilled to proper size) and studs and spaces are used wouldn't there be enough room for thermal expansion? Are the joints needed in something like a steed?



I always questioned why a Cat used studs, spaces and nut and not bolts like a Cummins (855). I was told the studs, spacers and nuts allow the manifold to grow, expand and move with heat and vibration.



EDIT: Not questioning your concerns, just looking for your thoughts and opinions.

With 3 pcs they can grow at different rates. With Steed it’s a one piece plate and the holes are slotted. So your hoping the plate can slide behind the spacers and not break the studs. On one of my trucks I drilled and tapped for 7/16 bolts and they’re doing good. But I think people over tighten the nuts and don’t allow for expansion.

[biggy238]

The problem with CAT's manifold design is that it assumes thermal expansion will be consistent across the entire part. This would work if the friction holding the manifold to the head was consistent, but then what happens when the highest coefficient of friction is not centered along the manifold? The manifold grows away from that point, leaving the other points on the manifold to compensate for the growth. The other issue is joint locking, where the slip joints can't slide inside one another. This compounds the other issue, because if one joint is locked, not the entire thing is expanding like a single piece.

We had hundreds of manifold repairs on a fleet of C13's. One night I got the idea to drill out the bolt holes to the same diameter on all of the ports. (cat didn't do this) so that the sections could slide farther without striking the studs. It seemed to work fairly well.

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[jfaulkner]

Originally Posted by biggy238

The problem with CAT's manifold design is that it assumes thermal expansion will be consistent across the entire part. This would work if the friction holding the manifold to the head was consistent, but then what happens when the highest coefficient of friction is not centered along the manifold? The manifold grows away from that point, leaving the other points on the manifold to compensate for the growth. The other issue is joint locking, where the slip joints can't slide inside one another. This compounds the other issue, because if one joint is locked, not the entire thing is expanding like a single piece.

We had hundreds of manifold repairs on a fleet of C13's. One night I got the idea to drill out the bolt holes to the same diameter on all of the ports. (cat didn't do this) so that the sections could slide farther without striking the studs. It seemed to work fairly well.

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This is why PDI’s slip seals are better than the OEM and FullTilt’s press fit. Cummins got one thing right.

[BRE]

Maybe I misunderstood here... which is superior? Full tilt or pdi?


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[biggy238]

Originally Posted by jfaulkner

This is why PDI’s slip seals are better than the OEM and FullTilt’s press fit. Cummins got one thing right.

Have you looked at the slips on the CT/Maxxforce 15? They have piston rings on them.

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[BRE]

Also... these idiots have no clue. I even tried stopping them before they were done loading because I knew it wasn’t gonna work. The response I got was “have to finish loading you, then we’ll fix it if it’s wrong”. Ok!!!!



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[RockinRam96]

Originally Posted by jfaulkner

With 3 pcs they can grow at different rates. With Steed it’s a one piece plate and the holes are slotted. So your hoping the plate can slide behind the spacers and not break the studs. On one of my trucks I drilled and tapped for 7/16 bolts and they’re doing good. But I think people over tighten the nuts and don’t allow for expansion.

What did you drill the holes out to on the manifold?

I think torquing the manifold properly play a big part in it. We always torque ours to Cats recommendations in the sequence they recommend. We haven't had an issues with studs on a B or C model. I think a lot of times a shop thinks two ugga duggas with the air wrench is proper torque.

[jfaulkner]

Originally Posted by RockinRam96

What did you drill the holes out to on the manifold?



I think torquing the manifold properly play a big part in it. We always torque ours to Cats recommendations in the sequence they recommend. We haven't had an issues with studs on a B or C model. I think a lot of times a shop thinks two ugga duggas with the air wrench is proper torque.

Didn’t need to drill manifold, the holes were already oversized. Just drilled head for larger bolts.

Originally Posted by biggy238

Have you looked at the slips on the CT/Maxxforce 15? They have piston rings on them.

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Maxxforce is a dirty word here. I try and not look at them.

Originally Posted by BRE

Maybe I misunderstood here... which is superior? Full tilt or pdi?


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Between the two PDI because Full Tilt still uses press fit joints like OEM.

[jfaulkner]

Originally Posted by BRE

Also... these idiots have no clue. I even tried stopping them before they were done loading because I knew it wasn’t gonna work. The response I got was “have to finish loading you, then we’ll fix it if it’s wrong”. Ok!!!!



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Can you back up and slam on the brakes?

[BRE]

Originally Posted by jfaulkner

Can you back up and slam on the brakes?

Tried that. Didn’t work


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[Yooper75]

Originally Posted by BRE

Tried that. Didn’t work


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Go find a nice steep hill and do it.

[BRE]

As we speak, they are now on attempt number 5 at making it right.


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[jfaulkner]

Originally Posted by BRE

As we speak, they are now on attempt number 5 at making it right.


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Ready to order the walking floor reefer I mentioned?

[J-Pipes]

Originally Posted by BRE

As we speak, they are now on attempt number 5 at making it right.


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So they've cost you what 4-5hrs at this point?

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[Yooper75]

Someone please remind me why all the extra emissions on the new trucks are necessary?

This new truck is going to drive me to drink and we haven't hauled load one with it yet.

[jfaulkner]

Originally Posted by Yooper75

Someone please remind me why all the extra emissions on the new trucks are necessary?

This new truck is going to drive me to drink and we haven't hauled load one with it yet.

To save the planet, remember that when your behind a new truck and the raw fuel smell is burning your eyes and it’s smoking blue trying to regen.

[jfaulkner]

Originally Posted by BRE

As we speak, they are now on attempt number 5 at making it right.


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They just can’t understand what spread axle means?