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Title: ****Best Stacks For IDA 48*** Post by: beetlemic on March 02, 2009, 17:08:57 pm We got a thread about IDA stacks but nothing for the Weber 48 IDA. First to find the right stack wich one to choose? I now Jaycee makes nice looking ones but how good are they? Also find it difficult to find aircleaners. What do you guys recomend? Here's a pic of my old stacks: (http://img338.imageshack.us/img338/351/weberweblc2.jpg) (http://img338.imageshack.us/my.php?image=weberweblc2.jpg) Title: Re: ****Best Stacks For IDA 48*** Post by: Bruce on March 03, 2009, 03:16:10 am .......
Title: Re: ****Best Stacks For IDA 48*** Post by: eugene on March 03, 2009, 10:24:51 am This scan is coming from STF right? I posted it. ;) It's from the book Tuning the A-series engine by David Vizard ( minis and such). It has extensive chapters about carbs also. Even little about IDAs. Vizard also tested flow trough various carbs:
. . WEBER 40DCOE (36mm venturi) = 175cfm DELLORTO 40DRLA (36mm venturi) = 182 cfm WEBER 45DCOE (38mm venturi) = 242 DELLORTO 45 DRLA (38mm) =254 DELLORTO 48DRLA (38mm)=283 WEBER 48IDA (38mmventuri) = 296 flow is per one barrel @21.3 inch of water depp. Really great book. Very detailed information about carbs, manifold, head porting( with drawings and measurements!) bottom ends, oiling , ignition,...500 pages. Is not for mini enthusiast only. I don't have one and have found lot of useful info in it. Title: Re: ****Best Stacks For IDA 48*** Post by: 181 on March 03, 2009, 11:26:20 am I s there a reason why 48DRLA flow less then 45DRLA with the same venturi?
Jan Title: Re: ****Best Stacks For IDA 48*** Post by: Jon on March 03, 2009, 13:06:49 pm Wow, great post!! :o :o
Title: Re: ****Best Stacks For IDA 48*** Post by: eugene on March 03, 2009, 14:07:08 pm I s there a reason why 48DRLA flow less then 45DRLA with the same venturi? Jan typing error. fixed :) Title: Re: ****Best Stacks For IDA 48*** Post by: Jon on March 03, 2009, 14:41:13 pm This doesn't look to promising for the stock stack of the IDA :(
Title: Re: ****Best Stacks For IDA 48*** Post by: BeetleBug on March 03, 2009, 14:48:48 pm This doesn't look to promising for the stock stack of the IDA :( True... but the Jay Cee on the other hand.. Title: Re: ****Best Stacks For IDA 48*** Post by: Bruce on March 04, 2009, 05:22:46 am This scan is coming from STF right? I posted it. ;) Could be. I don't remember where I found it.I wonder what #10 would flow like if it had a good 1/4" radius around the top of the stack? Title: Re: ****Best Stacks For IDA 48*** Post by: Roman on March 04, 2009, 20:27:47 pm Here is some more in depth information about stacks:
http://www.profblairandassociates.com/pdfs/RET_Bellmouth_Sept.pdf |