Effects of undivided ext. gate spacer on divided manifold & turbine housing

NickTF said:
Someone had to do it, cummins tubular manifold. - Competition Diesel.Com - Bringing The BEST Together

Did anything ever come of this header you created?
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I think I went over this earlier in the thread but no, not really, I made around 20 of them, but the price was high (very labor intensive) and I didn't have any contacts to distribute them for me, nor did I want to sell them myself.

This fall I have a new approach I am going to try.

cumminsman315 said:
Manifold.jpg
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Those tubes don't look to be any bigger than 1.5" to me.
 
it may lend some insight that 1.5" sch40 is 1.9" OD (i dont really give a care about the argument at hand, but i would suggest taht it may be sch40 pipe)
 
Hurley said:
it may lend some insight that 1.5" sch40 is 1.9" OD (i dont really give a care about the argument at hand, but i would suggest taht it may be sch40 pipe)
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Kinda what I figured, sch40 1.5" has an ID of around 1.61".
 
yeah, hell, you never know.

I'm still waiting to tear down the truck: getting injectors re-sealed & popped, and having the hot-parts coated with Cerakote - all before I can finish up the wastegate ****. I've also pulled my AFC off to verify that my arm wasnt hanging up underneath.
 
^^^ Pretty cool looking atleast! Wonder how it turned out for him?
 
NickTF said:
^^^ Pretty cool looking atleast! Wonder how it turned out for him?
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not sure, i would like to know also, he coated everything in that engine, valve faces, crank, cam, pistons(tops and skirts), cylinder bore, and put different paint-like coating on turbo, motor, valve covers

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^^ I remember those, think the fellow was from Europe somewhere. Last I remember he was drilling out the crank to lighten it. Seems to me it had a disaster of some sort, then maybe he lost interest. Wasn't any more updates.
 
Joesixpack said:
^^ I remember those, think the fellow was from Europe somewhere. Last I remember he was drilling out the crank to lighten it. Seems to me it had a disaster of some sort, then maybe he lost interest. Wasn't any more updates.
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yeah thats who it was, he was drilling out a crank to lighten it for a diff motor project, it was going to have a 24v head, he hasnt updated his page since 2008...its http://www.devilscastle.net
 
PASSENGER said:
Heat, in its self, does not drive the turbine. The reason people believe this is because heat, is a by product of what really drives the turbine, gas velocity, and density.
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You are way off there. Gas velocity is the by product of heat, not the other way around. As the air is heated it expands(the reason why your engine spins round and round) and as it expands it builds pressure which is your velocity. I believe what people are getting at is with a bigger manifold heat energy is dissapated both by cooling and by expansion into the larger free area. With a smaller manifold when the gasses expand there is nowhere for them to go but out past the turbo.

Think of it this way. Run a 1" garden hose into a 2" garden hose and see how fast the water comes out. No use that same 1" hose with the same water pressure into a 3/4" hose and see how fast the water is.
 
milldog said:
You are way off there. Gas velocity is the by product of heat, not the other way around. As the air is heated it expands(the reason why your engine spins round and round) and as it expands it builds pressure which is your velocity. I believe what people are getting at is with a bigger manifold heat energy is dissapated both by cooling and by expansion into the larger free area. With a smaller manifold when the gasses expand there is nowhere for them to go but out past the turbo.

Think of it this way. Run a 1" garden hose into a 2" garden hose and see how fast the water comes out. No use that same 1" hose with the same water pressure into a 3/4" hose and see how fast the water is.
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There's a lot left to be desired with that explaination - what about exhaust pulse/reversion?


Either way, I have breaking news!!!!!!! IT WAS NOT THE WASTEGATE ASSEMBLY

***Something was malfunctioning with the AFC; I pulled it, adjusted the shaft centerline, switched to the softer TST spring, added a half turn of pre-boost preload (total preload), drilled out the orifii in the fittings to 3/16", and re-centered the diaphragm with more attention than i did previously***


:doh::nail:
 
Hurley said:
There's a lot left to be desired with that explaination - what about exhaust pulse/reversion?


Either way, I have breaking news!!!!!!! IT WAS NOT THE WASTEGATE ASSEMBLY

***Something was malfunctioning with the AFC; I pulled it, adjusted the shaft centerline, switched to the softer TST spring, added a half turn of pre-boost preload (total preload), drilled out the orifii in the fittings to 3/16", and re-centered the diaphragm with more attention than i did previously***


:doh::nail:
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:rockwoot: glad you got her figured out
 
Is reversion a factor with forced induction?

Glad you got it figured out. How does she run?
 
I would assume the pulse 'cadence' would have a worthwhile effect; being able to control the flow from each cylinder and constructively add it's energy to the tubine wheel is a key part... so maybe not "reversion" as much as 'decreasing as much pressure drop across the manifold as possible'.


it runs well, normal hesitation & 'hit' of the 66 (for 12V) is fun to experience
 
milldog said:
You are way off there. Gas velocity is the by product of heat, not the other way around. As the air is heated it expands(the reason why your engine spins round and round) and as it expands it builds pressure which is your velocity. I believe what people are getting at is with a bigger manifold heat energy is dissapated both by cooling and by expansion into the larger free area. With a smaller manifold when the gasses expand there is nowhere for them to go but out past the turbo.

Think of it this way. Run a 1" garden hose into a 2" garden hose and see how fast the water comes out. No use that same 1" hose with the same water pressure into a 3/4" hose and see how fast the water is.
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No.
While heat plays a role in the velocity, it is NOT a byproduct of heat, in this application velocity is mostly a function of piston speed, bore size/primary tube diameter relationship.

The garden hose analogy is ridiculous, it is entirely possible for the water to maintain the same speed through all of them, there isn't enough info given. Water and garden hoses don't act like exhaust gas and header tubes.
 
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