Intake length vs torque, Just anthoer carb question No boobs |
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Intake length vs torque, Just anthoer carb question No boobs |
Joe Ricard |
May 18 2005, 02:03 PM
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#1
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CUMONIWANNARACEU Group: Members Posts: 6,811 Joined: 5-January 03 From: Gautier, MS Member No.: 92 |
So I have short intakes and 44IDF's with 38mm vents
How long of an intake should I go to with these carbs or should I go to 40 IDF's with 32 vents or 28 vents. I have some longer runner intakes and the other carbs so it's just a matter of experimenting I guess. 2.0L Bus piston Web 86B portmatch intake and exhaust ports. 13lb flywheel Bursch SSI Car weighs 1965 lbs 205/50-15 Kumho V700 R tires. Thought of playing with spacers under the carbs to get more length and maybe spacer under the common length velocity stack. Looking for more torque down lower to pull harder exiting the apex of tight AX turns. Whose got the experience of really been there done that? great gains or don't bother. |
Dr. Roger |
May 18 2005, 07:36 PM
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#2
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A bat out of hell. Group: Members Posts: 3,944 Joined: 31-January 05 From: Hercules, California Member No.: 3,533 Region Association: Northern California |
That's right... (IMG:http://www.914world.com/bbs2/html/emoticons/wink.gif)
Quote from CarCraft Magazine... Smaller carburetors are commonly suggested for building torque, because their smaller venturis keep air velocity high to promote good fuel atomization. If you want to broaden the power band to retain good torque at the low end and extend power at the top end, you can make a case for a larger carburetor if it is teamed with the appropriate mix of components. The primary reason for keeping venturi size small is to maintain air speed through the boosters. This is especially critical with single-plane manifolds and larger cams, which generate weak booster signals at low rpm and the resulting loss of atomization quality and metering accuracy. This results in reduced torque output and poor driveability, but correcting it with smaller high-speed venturis may limit power at the high end. Bottom line. there are trade-offs. U need to decide what's best for you. (IMG:http://www.914world.com/bbs2/html/emoticons/biggrin.gif) |
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