Thread: Hi-Ram Tunnel Ram
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11-08-2006 03:55 PM #1
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Hi-Ram Tunnel Ram
what about the Manifolds Hi-Ram Tunnel Ram, in stroker engine 383?
the Carburetors edelbrock 1500cfm?
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11-08-2006 07:17 PM #2
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Way to much carb.
Originally Posted by ra7tnast
Here is the old carb forumula for size.
Carb. CFM required = CID X MAX. RPM,then divide by 3456.
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11-09-2006 08:48 AM #3
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^^^^ that's right! (actually VE*CID*maxrpm/3456 where VE is volumetric efficiency)
Sometimes a quicker rule of thumb is CID*2 i.e. 383*2 -> 766cfm
this shortcut assumes max rpm~7000 (3456*2) and 100% volumetric efficiency (most motors are 80% to 95% efficient).... a 750cfm carb should suffice unless you're looking to spin the motor much over 7000rpm.
This is for minimum cfm required.... you can go larger but if you go too big the vaccuum signal will be too weak at lower rpm.
2 cents,
Chris
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11-09-2006 11:40 AM #4
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Yeah but the plenum volume of a big tunnel reguires a lot more wetting out than you might think.
Why do you want to run a tunnel ram?
KitzJon Kitzmiller, MSME, PhD EE, 32 Ford Hiboy Roadster, Cornhusker frame, Heidts IFS/IRS, 3.50 Posi, Lone Star body, Lone Star/Kitz internal frame, ZZ502/550, TH400
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11-09-2006 12:22 PM #5
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I was wondering when someone was going to talk about "wet flow". Originally Posted by kitz
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11-09-2006 09:58 PM #6
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Because it just looks freakin COOOOOL! Originally Posted by kitz
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11-10-2006 04:10 AM #7
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A guy in Saskatoon built a small block Ford with a dual-four tunnel ram (cause it looks so COOOOOL!) and he put adapters and dual Holley two-barrels on it. Most people don't notice the diff, and he can drive the thing with no problem. Sorta like the triple carb flattie manifolds with the center carb blocked off.
Must be a farm boy!
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11-10-2006 10:26 AM #8
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thank you all
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