 ? Long or short intakes for dual carbs |
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| ETMracing |
 Sep 23 2014, 08:58 AM
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#1
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Newbie  Group: Members Posts: 37 Joined: 22-August 13 From: frederick md Member No.: 16,288 Region Association: MidAtlantic Region  |
I am currently running a 2.0/4 with a cam and dual 44idf webers on Tangerine cable linkage and short intake manifolds. My question is what are the benefits/downsides on the taller intake manifolds? I have the option to run both
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| Bruce Hinds |
Sep 23 2014, 02:28 PM
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#2
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V-8 madness Group: Members Posts: 733 Joined: 27-December 06 From: Port Orchard, WA Member No.: 7,391 Region Association: Pacific Northwest |
I was really hoping someone would chime in on this, I've wondered the same thing myself.
I know some of the high performance SBC heads have longer intake runners. I have noticed that some of the intakes used for higher RPM will be taller and some designed for torque will be shorter. |
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| SirAndy |
Sep 23 2014, 02:37 PM
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#3
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Resident German Group: Admin Posts: 41,632 Joined: 21-January 03 From: Oakland, Kalifornia Member No.: 179 Region Association: Northern California |
QUOTE(Bruce Hinds @ Sep 23 2014, 01:28 PM)  I have noticed that some of the intakes used for higher RPM will be taller and some designed for torque will be shorter. You got that backwards! Taller intakes give you a bit more low end torque, shorter intakes will give you a bit more high rpm power. (IMG:style_emoticons/default/smile.gif) |
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| Triaddave |
Sep 23 2014, 02:59 PM
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#4
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Member Group: Members Posts: 244 Joined: 31-December 03 From: olympia,wa Member No.: 1,478 |
I installed the tallest manifolds that would fit (with the carbe and filter) under the deck lid
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| Bruce Hinds |
Sep 23 2014, 03:08 PM
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#5
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V-8 madness Group: Members Posts: 733 Joined: 27-December 06 From: Port Orchard, WA Member No.: 7,391 Region Association: Pacific Northwest |
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| URY914 |
Sep 23 2014, 06:38 PM
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#6
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,532 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
Depends on your cam and the entire combo.
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| stugray |
Sep 23 2014, 08:56 PM
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#7
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I know that on my other NA boxer engine there is an aftermarket part (crawford billet power blocks) that extends the intake manifold runner length over stock.
This results in an almost perfect shift of the torque curve downwards in the RPM range. So if even remotely apples to apples: longer runners = higher torque at lower RPM shorter runners = higher torque at higher RPM |
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