crossfire intake manifold porting
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Re: crossfire intake manifold porting
with 5/16" added to top of runner same 1.4 x 1.1 main runner and 1.6 x 1.22 entrance flowed 213cfm. flowed 166cfm with stock head.with head that flows 250cfm it flowed 200cfm. probably 3 passes of weld on top of runner would do it. flow started going down when more was added to top of runner. this is so much easier than what I did while learning.
the .2" taper is part of the design. show as #1. # 2 shows the 5/16" added
larger main runner still needs the taper too be efficiency.
best case, would be to taper the entire runner. not an option for stock intake.
been doing research on intake runner design. making the entrance bigger than the main runner is common. mini ram, crossarms, import intake porters do it.
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Junior Member
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Re: crossfire intake manifold porting
found an interesting article. blades under TB's are for fuel distribution and mixing. also this top plate isn't the same as. wonder what car it's from
Improvement or Impairment? To Modify G.M.’s New Fuel Injection You Have To Get With The Program
Improvement or Impairment? To Modify G.M.’s New Fuel Injection You Have To Get With The Program
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89ProchargedROC
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Jul 25, 2002 09:40 AM