 Larger chokes (venturies) on my Webers? |
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| Eddie914 |
 Oct 19 2004, 07:35 PM
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#1
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Unregistered  |
I have removed the Weber 40IDC 3A carbs for a rebuild.
They currently have 32mm venturies. Will larger venturies give more top end power? The engine is 2.7 from a '77 911. Internals (P/Cs, compression ratio, Cams) are unknown. Bursch Headers with megaphones (with removable baffles). The car is 90% track. Weighs less than 2100lbs. Thanks Eddie |
 
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| Thorshammer |
Oct 20 2004, 10:09 AM
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#2
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Senior Member  Group: Members Posts: 749 Joined: 11-November 03 Member No.: 1,335 |
Since the SCCA has stuck me with 34mm Venturis, I have done alot of testing with other venturis, 32-37.5
For the 2.7 S I would recommend a 34 it is a compromise on all fronts, but will retain the Power under the curve or PUC. with the sacrifice of only a couple HP up top. The data I have from testing indicates a 36 mm venturis over a 34 mm venturi is an increase of only 4 hp above 5500 rpm to a max of 7200 rpm. 34 mm is a very good choice. but your car is light so you can try 36mm, lap times will be the final indicator of proper sizing. Erik |
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Posts in this topic
Eddie914 Larger chokes (venturies) on my Webers? Oct 19 2004, 07:35 PM
TimT Yes you will get more top end, but you will give... Oct 19 2004, 07:44 PM campbellcj I could be wrong (it happens every few years :sha... Oct 19 2004, 09:29 PM fiid Did you know if you spell carbs wrong you get crab... Oct 19 2004, 10:06 PM nebreitling LMFAO... Oct 19 2004, 10:23 PM Eddie914 I pulled the carbs apart tonight.
Current jetting... Oct 20 2004, 01:43 AM J P Stein It's not a good idea to just change one aspect... Oct 20 2004, 02:03 AM Joe Ricard Well Maybe I'm and idiot (I doubt it) But CIS ... Oct 20 2004, 06:23 AM Root_Werks For something cammed like a 2.7S engine you will w... Oct 20 2004, 08:50 AM Eddie914 The power curve is fairly linear. The rev limiter ... Oct 20 2004, 11:33 AM Root_Werks Probably, they are going on a cutomers 2.8 tonight... Oct 20 2004, 11:39 AM Eddie914 Dan,
Oops!
I meant to ask if the 40/36 Weber... Oct 20 2004, 11:44 AM Root_Werks Hmm, I might have another set we could use though.... Oct 20 2004, 11:46 AM Eddie914 I'll do the antipercolation modifications and ... Oct 20 2004, 12:38 PM J P Stein ... Oct 20 2004, 06:00 PM Eddie914 JP,
What are the specs on your 2.7?
What are the... Oct 21 2004, 08:50 AM Root_Werks Hey Eddie,
Put those 40/36's on that guys 2.8... Oct 21 2004, 09:08 AM J P Stein ... Oct 21 2004, 12:52 PM
Eddie914 Dan,
Thanks for the offer. I'd love to try ou... Oct 22 2004, 12:01 AM |
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