ported and polished

I haven't heard of anyone that has applied it to a big truck.

But I've often wondered why not. Extrud-A-hone would seem to make a lot of sense to me, to increase air flow and velocity.

Port matching, shouldn't be an issue. As most tolerances are much better now days.

Another equally useful modification. Increased pressure at the injector, with reduced hole sizes at the tips. And I haven't seen anyone offer this yet either. Although it's been proven to increase torque at lower RPM's.

Toro has developed an injection method that doesn't need an injector per se. It relies completely on a simple hole drilled in the head. The tremendous fuel pressure and hole diameter prevents clogs and loss of cylinder pressure.

 

I have one internally polished (not ported) and ceramic coated sitting in my workshop ready to go on a C-15 but the owner hasn't had time to get it fitted yet. will let everyone know how it goes once fitted.

 

Have heard that the ceramic coating is supposed to help, but hadn't spoke to anyone who has utilized it. One place offers an exchange type of transaction, to lesson the downtime; they don't list the cost, which is something I'm curious about.

 

I don't know what process the shop you've looked into uses. But the cost should not be too prohibitive. More labor, than materials. And not much more than the average head rebuild.

I wouldn't pay much more than that.

I spent a year at the 2nd largest Cummins remanufactor in the US. We used this process when rebuilding a head. The coating actually helps the heads to run cooler. And since it dries almost as smooth as glass, velocity should see a slight increase.

As for the fuel economy ??? I would be hard pressed to make a claim of increased fuel economy.

 

These manifolds are just starting to get out to the public veiw. The porting and polishing makes a lot of difference in air flow alone. Add in the ceramic coating and things get even better. The coating holds the heat in the exhaust gases and moves it into the turbo which helps the scavenging effect of the exhaust flow. I currently do not run one, but I am at the cross roads where I got to decide to run one with a single turbo setup or run it with my compound turbos.

The reason nobody really lists a price is because of all the different manifolds. Also, say you have a 3 peice manifold. Well most likely the end manifolds will be fine but the center section may have a crack in it. In this situation you will have to buy a center section to do the trade.

 

i've heard good results with the manifolds,but as always do ur research.

 

Bruce Mallinson owner of Pittsburgh Power diesel injection has been doing this for years, her is a link to his shop http://www.pittsburghpower.com/

 

In my opinion the ported and coated is a better way to go than a 3406B manifold with the research Ive done,but would like to hear from anyone that has done this as I haven't yet due to our dollar falling so fast against the US when I was buying parts it was up around $0.81 now its at $0.49 makes for very expensive parts.

 

This is a more expensive exercise than most realise, My little experiment is really to find out if the cost outweighs the gain.
The one I have polished was all new centre and ends, the reason is that is once the manifold has been heated it hardens, belive me its very difficult to polish a secondhand manifold but a new manifold is much easier.
A little tip for anyone doing this at home... the exhaust sleeves in the head come with the gasket rivited to it, and they're expensive so you can save some dollars by buying 6 of 1384611 and 6 of 1095313 gaskets. The 1384611 gasket gose between the sleeve and head and the 1095313 gasket goes between the sleeve and manifold. All you need to do is grind off the rivets holding the old gaskets to the sleeve and clean the surfaces up. oh, and check for cracks in the sleeve, if you find cracks in any of them its best to replace the whole set, they may be expensive but if one breaks up and goes through a your turbo it will cost a lot more, also some sleeves were known to fail and should be replaced they are part numbers 1887775 and 1953187.
Most dealers will tell you that you have to replace the sleeves and dont even know the gasket are availble separately.