 Weber 48 IDF Carbs |
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| 914 Monster |
 Jan 21 2009, 09:17 PM
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#1
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Newbie  Group: Members Posts: 27 Joined: 14-April 08 From: Los Angeles Member No.: 8,924 Region Association: Southern California  |
Can anybody please inform me about the 48 IDF weber carbs and which IDF weber carb provides more top performance?
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| Jake Raby |
Jan 22 2009, 02:38 AM
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#2
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
One of the fastest ways to create an engine with a less than friendly usable RPM range is to over carb it.. The TIV is a velocity engine and doesn't need massive amounts of intake volume to make it's best power.
we make 200HP from less than 2.3 liters and 9.5:1 CR with only a 44mm IDF carburetor with a stock 36mm venturi. These engines have a TON of usable power and don't just perform well on the dyno, they have an RPM range thats usable from 2-6.5K RPM and thats the key to making a fast car. I don't use a 48mm carb till we exceed 2.7 liters, but this is with engines that feature my design thats greatly different from other tuners. the bottom line is big carbs perform best on big engines and unless you have the budget for a big engine the big carbs will just be hard to tune and make usable power at an RPM that the engine isn't generally operated at. That means their use is virtually worthless on anything of "sane" displacement. |
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| johnnie5 |
Jan 22 2009, 05:33 AM
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#3
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914 lover Group: Members Posts: 375 Joined: 14-October 08 From: San Diego, CA Member No.: 9,644 Region Association: Southern California |
QUOTE(Jake Raby @ Jan 22 2009, 12:38 AM)  One of the fastest ways to create an engine with a less than friendly usable RPM range is to over carb it.. The TIV is a velocity engine and doesn't need massive amounts of intake volume to make it's best power. we make 200HP from less than 2.3 liters and 9.5:1 CR with only a 44mm IDF carburetor with a stock 36mm venturi. These engines have a TON of usable power and don't just perform well on the dyno, they have an RPM range thats usable from 2-6.5K RPM and thats the key to making a fast car. I don't use a 48mm carb till we exceed 2.7 liters, but this is with engines that feature my design thats greatly different from other tuners. the bottom line is big carbs perform best on big engines and unless you have the budget for a big engine the big carbs will just be hard to tune and make usable power at an RPM that the engine isn't generally operated at. That means their use is virtually worthless on anything of "sane" displacement. I had a buddy of mine recommend that if I put 44's on the 2056 I would be better off. I told him the motor seems to be running pretty darn good with 40's , and it just seems to me 44's on a 2056 would be a little overkill. It did make me curious as to what difference the motor would have with 44's on it. Am I correct, would 44's on a 2056 be too much carb? |
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| 96740 |
Mar 25 2009, 06:02 PM
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#4
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Member Group: Members Posts: 328 Joined: 10-March 08 From: Thousand Oaks, CA Member No.: 8,791 Region Association: Southern California |
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Posts in this topic
914 Monster Weber 48 IDF Carbs Jan 21 2009, 09:17 PM
McMark 48 mm carbs are huge. You'd better have an ab... Jan 22 2009, 12:17 AM Type 4 Unleashed Here is some European thinking on carburator size.... Jan 22 2009, 02:13 AM Al Meredith I had 40MMs on my 2056 when I built it . My Son wa... Jan 22 2009, 09:34 AM
r_towle
I had 40MMs on my 2056 when I built it . My Son w... Jan 23 2009, 03:33 PM sww914 You'll always be happier with carbs that are t... Jan 22 2009, 09:54 AM JmuRiz Does seem like a huge carb, I thought the Delorto ... Jan 22 2009, 11:42 AM jmill
You'll always be happier with carbs that are ... Jan 22 2009, 12:01 PM johnnie5 sww914,
Whats wrong with 22's, DAWG... Jan 23 2009, 09:47 AM 9146986 Yee hawww a couple o buck boards!
Back OT, yo... Jan 23 2009, 03:14 PM So.Cal.914 These guys would not lead you wrong. Keep your 40... Mar 25 2009, 06:41 PM 96740 I'm in the market for some new carbs. I now ha... Mar 25 2009, 09:26 PM Chris Hamilton If anyone has an old useless set of 48mm webers th... Mar 25 2009, 10:31 PM DBCooper
If anyone has an old useless set of 48mm webers t... Mar 27 2009, 11:03 AM koozy me too... Mar 26 2009, 01:16 AM schreiber This thread seems closely-related to a question I ... Mar 27 2009, 10:10 AM |
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