single manifold design

[vn1uz]

What size pipeing should i use for the primary's and the crossover pipe ??
i will be making the manifold 4-1 design on each side that then collect into one pipe that feeds the turbo. My previous turbo manifolds i have made i found that when i made one out of mild steel exhuast pipe it didnt last long as it heated up and cracked pritty much on the first run so we then used 3 mm steam pipe this is still working today 3 years later. With the single turbo V8 will the crossover pipe need to be made out of 3mm as well or will normal exhuast pipe suit ??
the weight would be getting up ther if it has to be so would stainless be a better option for the crossover pipes ??
or is ceramic coated exhuast pipe ok ??

 

[Lextreme II]

Cross pipe is 2" and main pipe 2.5" would be best.

 

[vn1uz]

what about the wall thickness? so i should run 4 1.5 inch into 2 for the cross then the 2 2 inch into 2.5 ?? wouldnt 2 inch be a little restrictive ?? i was thinking 2.25 for the cross pipe

 

[Lambo]

Hi VN1uz, Sounds like a little help is needed, have a look at this site if you register it gives access to a full header design program, and the best bit it's free. http://www.headerdesign.com
Regards
Lambo

 

[vn1uz]

thanks for that i will check it out

 

[vn1uz]

that site didnt really help me that much
as this is a turbo motor i dont think it really applies
it told me my power was urealistly high 500hp ??

Quote -
Your membership to HeaderDesign.com will give you everything you need to design header-based exhaust systems for 4-stroke, naturally aspirated gasoline engines.

 

[Lextreme II]

Have you seen this www.lextreme.com/st.html

 

[vn1uz]

yes i have

i have seen that but i was planing on running 2 4 -1 style extractors on each side with a cross over pipe.
has that manifold held up alright i thought it would have cracked being so thin and restrictive looking