 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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| J P Stein |
Oct 21 2004, 12:52 PM
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#2
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Irrelevant old fart  Group: Members Posts: 8,797 Joined: 30-December 02 From: Vancouver, WA Member No.: 45 Region Association: None |
QUOTE(Eddie914 @ Oct 21 2004, 06:50 AM) JP, What are the specs on your 2.7? What are the differences between a 2.7 and a 2.7S? bigger ports and valves? Eddie My 2.7 has 9.7:1 compression, Solex cams & very mild porting. The "crab" set up is right out of Andersons book for his hot rod 2.7: 34mm venturi F3 tubes 135 mains 145 air corr 60 idles. Works for me. He also did a comparo (dyno graph in the book) between 32,34,& 36 mm venturi and the difference is minimal. The 2.7 CIS motors are basicly all the same...powerwise...165/175 hp depending on exhaust... with the exception of the 2.7L "normal" from 1974 ......small port , 8.0:1 compression, 150 hp. |
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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 Thorshammer Since the SCCA has stuck me with 34mm Venturis, I ... Oct 20 2004, 10:09 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
Eddie914 Dan,
Thanks for the offer. I'd love to try ou... Oct 22 2004, 12:01 AM |
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