We still use aircraft grade bellows, and they were made to my specs for this application.
Really? When did this change? You wanted to buy OUR better "air craft grade bellows" (when yours were failing) But you said they were too expensive....
We also make our up pipes one piece now that we can bend them in house.
I am glad to hear that you used OUR idea on this. (you must of copied our bends when I sold you a bunch of them back is 2010). This is a MUCH better way of doing it then the multiple cuts and welds you used before.
We however use a nodular iron casting. One of the strongest castings out there and we have never had a single manifold failure. You might be able to say that too, but you don't have the time behind you to have it mean anything.
Don’t you mean ductile Iron? No our manifolds have not been out as long as yours but I can assure you of their reliability as Garrett also tested them on their Thermal cycling Rig. How can you say that nodular/ductile Iron is the strongest casting out there??? Here is some info on the comparison of ductile/nodular iron vs Hi-sil molly http://www.ductile.org/didata/Section5/5intro.htm#High Silicon with Molybdenum
“SILICON- MOLYBDENUM DUCTILE IRONS
Alloy Ductile Irons containing 4-6% silicon, either alone or combined with up to 2 % molybdenum, were developed to meet the increasing demands for high strength Ductile Irons capable of operating at high temperatures in applications such as exhaust manifolds or turbocharger casings. The primary properties required for such applications are oxidation resistance, structural stability, strength, and resistance to thermal cycling.
These unalloyed grades retain their strength to moderate temperatures (Figures 3.21, 3.22, 3.23), perform well under low to moderate severity thermal cycling (Figure 3.37) and exhibit resistance to growth and oxidation that is superior to that of unalloyed Gray Iron (Table 3. 1). Ferritic Ductile Irons exhibit less growth at high temperatures due to the stability of the microstructure. Alloying with silicon and molybdenum significantly improves the high temperature performance of ferritic Ductile Irons while maintaining many of the production and cost advantages of conventional Ductile Irons.
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Effect of Silicon
Silicon enhances the performance of Ductile Iron at elevated temperatures by stabilizing the ferritic matrix and forming a silicon-rich surface layer which inhibits oxidation. Stabilization of the ferrite phase reduces high temperature growth in two ways. First, silicon raises the critical temperature at which ferrite transforms to austenite (Figure 5.1). The critical temperature is considered to be the upper limit of the useful temperature range for ferritic Ductile Irons. Above this temperature the expansion and contraction associated with the transformation of ferrite to austenite can cause distortion of the casting and cracking of the surface oxide layer, reducing oxidation resistance. Second, the strong ferritizing tendency of silicon stabilizes the matrix against the formation of carbides and pearlite, thus reducing the growth associated with the decomposition of these phases at high temperature.
The oxidation protection offered by silicon increases with increasing silicon content (Figure 5.2). Silicon levels above 4% are sufficient to prevent any significant weight gain after the formation of an initial oxide layer.”
Read the link above if anyone wants more info on the material we use and the benifites
My offer still stands. We can call it " put up shut up 2. " :roflmao: I'll bring a set of the ProFlows for testing too.
You can do whatever testing you would like. We have already spent a good deal of money testing these parts. There are too many UNCONTROLLED factors when dyno testing parts (special parts, The dyno operator, Fudging of info). I am sure the proflows work well
