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| Pontiac - Boost Turbo, supercharged, Nitrous, EFI & other Power Adders discussed here. |
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#1
12-23-2017, 05:32 AM
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how much boost?
How much boost can a stock cast piston take in a 77 400? Just to set up all the plumbing in the car before the turbo motors done. The play a little too.
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#2
12-23-2017, 09:13 AM
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People did 5 to 7 psi in the old days with Carb "Draw Thru Systems" many times without issues. 7 psi could add another 100 hp or more to a engine fairly easily.
Today 12-14 with a GOOD C&S Blow-Thru 4-bbl carb and you are talking maybe 175 increase in the engine. Cast pistons should survive at an actual 400 HP for a long time if you don't get greedy. A Heavy Forged TRW Piston in a 455 made 863 HP with only 13 psi at 5300 rpm so a cast piston you would think should survive at 1/2 that hp. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#3
12-23-2017, 11:43 AM
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I think ring gap would cause a issue before the piston.
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#4
12-23-2017, 12:00 PM
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I’m running 5-6 in my Wife’s supercharged 1979 TA with a 400 in it BUT I wouldn’t go anymore! It is a street car!
GTO George |
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#5
12-23-2017, 07:34 PM
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I agree with the others, 6 should be ok just remember to pull some timing and use decent fuel. 6 will give you a healthy boost of torque
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#6
12-24-2017, 01:55 AM
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Quote:
GTO George |
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