#770 (912E) Project thread *Tangerine Cooling System installed!) |
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#770 (912E) Project thread *Tangerine Cooling System installed!) |
Bulldog9 |
Aug 21 2013, 08:44 PM
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#1
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Senior Member Group: Members Posts: 705 Joined: 21-August 13 From: United States Member No.: 16,283 Region Association: MidAtlantic Region |
I'm restoring a 912E, total gut & rebuild. New to this forum, been on the 912 board and several others for a while. I've never worked on an air cooled car engine before, or VW/Porsche of any type, so this has been a real learning process. Been lurking here for a while, figured it was time to post. I've been on 912BBS since 2011, for those interested, this link goes back to day 1. http://www.912bbs.org/vb/showthread.php?43391-770-Update
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Bulldog9 |
Dec 4 2013, 08:41 PM
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#2
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Senior Member Group: Members Posts: 705 Joined: 21-August 13 From: United States Member No.: 16,283 Region Association: MidAtlantic Region |
Gents, diddnt want to start a new thread, and trying to keep some discipline
So a few weeks ago I scored a new set of Dellorto 36's. I've heard and read several different opinions on wether these are too small. I've read that Dell's flow as well as one size up Webers, and because the target IDF was 40 as opposed to 44's, I figured that the Dellortos were the 'right size'. I've also been told that the 30mm venturis will be restrictive especially with my larger cam and Hoffman Heads. So being a 'show me' kind of guy I have been reading and researching and discovered the following: 1. The CFM of Dellorto 36 DRLA is 205.8cfm/venturi for a total of 823CFM (CB Performance) 2. Approx 208 CFM total is Needed for a 126.27952 CID (2056cc) Mildly Built Engine (Carbs Unlimited) 3. Divide 208CMF/4 and you get 52 CFM/cyl..... 4. I measured the internal venturi/housing size of the SINGLE throttle body for the stock EFI and it is 58mm at its widest, and this flows all the air for the motor. Based on all of this looks, it like the Dell will easily meet any demand for flow........ If the projected CFM for each cyl is 52, and each venturi will flow 205CFM, this is good right? Even if the CFM number posted for the carb is for BOTH Venturi's (barrells) I am still more than double the calculated CFM required...... SO....... other than experience, What am I missing???? |
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