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Title: IDA progression holes... Post by: gizago on April 30, 2010, 13:52:51 pm I know most IDA's left the factory with 2 prog holes, and a few with 3, but did they change the position of the holes over the years?? The reason I am asking is that I am about to drill 3rd holes in mine, (Spanish) and had a look on the Art Thraen how to on aircooled.net,( http://www.aircooled.net/gnrlsite/resource/articles/48idarebuild.htm ) and it shows this-
Most IDAs only have 2 progression holes in them, which makes them more "off/on" in operation. Late IDA's had the third hole when new. Here's how the Third Progression Hole Modification will look after it's done! (We are shining a flashlight down the venturi). The top hole is the new one you are adding. (http://www.aircooled.net/images/gnrlpgs/carbrebuild/carb09s.jpg) However, mine has the top hole, its the middle/left one thats missing- (http://i742.photobucket.com/albums/xx70/gizago-parts/engine%20parts/progholes.jpg?t=1272631171) So, I guess what I am asking, is do I add the 3rd hole in the left/middle position to match the Art Thraen example?? Cheers, Mat. Title: Re: IDA progression holes... Post by: Speed-Randy on April 30, 2010, 16:13:19 pm and shops are charging $100 or more to do that, unbelievable. especially when proper jetting eliminates the need for it
Title: Re: IDA progression holes... Post by: John Rayburn on April 30, 2010, 16:26:43 pm X2.
Title: Re: IDA progression holes... Post by: Jim Ratto on April 30, 2010, 16:30:56 pm and shops are charging $100 or more to do that, unbelievable. especially when proper jetting eliminates the need for it yep Title: Re: IDA progression holes... Post by: Bruce on April 30, 2010, 17:55:12 pm and shops are charging $100 or more to do that, Have you ever tried to do it? Placement is critical, and it's not easy to see down that hole while trying to drill. Title: Re: IDA progression holes... Post by: Bruce on April 30, 2010, 17:57:38 pm However, mine has the top hole, its the middle/left one thats missing- The hole you think is the top one is the middle one. The 3rd hole goes above and to the left of that. It is the vertical spacing between holes you must keep constant.(http://i742.photobucket.com/albums/xx70/gizago-parts/engine%20parts/progholes.jpg?t=1272631171) Title: Re: IDA progression holes... Post by: gizago on May 01, 2010, 19:04:08 pm Cheers for the advice guys. Might wait and see how it drives with just the 2 holes, I've done the enlarged float bowl mod, but it's mainly going to see (hard) road use, and occasional strip action.
Title: Re: IDA progression holes... Post by: Speed-Randy on May 02, 2010, 15:32:25 pm and shops are charging $100 or more to do that, Have you ever tried to do it? Placement is critical, and it's not easy to see down that hole while trying to drill. Title: Re: IDA progression holes... Post by: bluestar on May 02, 2010, 17:10:06 pm not necessary to do that...
Title: Re: IDA progression holes... Post by: Bruce on May 02, 2010, 19:27:42 pm and shops are charging $100 or more to do that, Have you ever tried to do it? Placement is critical, and it's not easy to see down that hole while trying to drill. Title: Re: IDA progression holes... Post by: Type1/DVK on May 02, 2010, 19:51:24 pm drive and jet it correctly with 2 holes, and if your not happy with it, or transistion, drill the 3rd.
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