- Scott SainParticipantOctober 14, 2018 at 9:32 amPost count: 183PeteParticipantOctober 14, 2018 at 9:46 amPost count: 813cookiemonster131ParticipantOctober 14, 2018 at 11:41 amPost count: 135
Last I checked I was Scooter. I just saw her about 10 minutes agoJohn JonesKeymasterOctober 14, 2018 at 12:02 pmPost count: 5910PeteParticipantOctober 14, 2018 at 3:49 pmPost count: 813
Just took it over to the Casa de Sain for him to check out (and to get out on a longer drive). It did well….and I got on it a little more 😊…..I’m as happy as can be with the power it makes.Douglas E FreshParticipantOctober 15, 2018 at 9:11 amPost count: 116
this car is awesome. Very well done.tlambertParticipantOctober 15, 2018 at 10:35 amPost count: 279PeteParticipantOctober 15, 2018 at 1:47 pmPost count: 813
Thanks guys! Drove it to work today….it’s great!PeteParticipantOctober 16, 2018 at 6:58 amPost count: 813
Sounds like the jetting is good.
My drive to work is only 8 miles from home, but about 3 of that is a stretch of interstate. I noticed yesterday when holding a steady RPM slightly above 3k under load the engine stumbles and the carbs pop. I’ve asked Scott “the carb whisperer” Sain to look at it and help dial it in more since my past experience with troubleshooting dual carbs is nil. I feel pretty good that they’re sync’d at idle…air flow measures the same from side-to-side and linkage rods lengths are dialed.
Since it’s smooth/balanced at idle up to 3k does it sound like a main jet sizing issue?JWDIIParticipantOctober 16, 2018 at 7:45 amPost count: 374
Welcome to life with dual carbs Pete! Well in my experience (that is limited to Webers) they are happy one day and not the next. It sounds like yours are running a little lean in that range . Good thing you have Mr. Sain and his Infinite knowledge and experience with Hot rod VW’s to lend a helping hand. Hopefully you two will have it smoothed out in no time.FranzKeymasterOctober 16, 2018 at 8:27 amPost count: 3099
Usually a pop through the carb is a lean condition. Its hard to imagine 60 idles are not big enough. I’d say go up a size or two on the mains.JdawgParticipantOctober 16, 2018 at 8:32 amPost count: 423
my car is a single carb but did the same thing when it was cold outside…I talked to Franz, went up a size on the main and put non ethanol fuel in it and its been smooth ever since.PeteParticipantOctober 16, 2018 at 9:36 amPost count: 813
Usually a pop through the carb is a lean condition. Its hard to imagine 60 idles are not big enough. I’d say go up a size or two on the mains.
Thanks Franz. I think we’re at 122 now, and CB sells 125 and 128 for DRLA’s. If that’s “up” enough I’ll pick up some of both.
Does the vent size factor into it? My intake valves are 35mm, and I think we’re using the 26mm vents (and have 28’s).FranzKeymasterOctober 16, 2018 at 12:00 pmPost count: 3099
It could be something with the jet transition from idle jets to main jets. Which would be emulsion tube characteristics. Try the 128 main jets and see what happens.
Emulsion tubes control the main jet circuit. The introduce air into the fuel before sending the mixture to nozzles to spray into the engine(just above the the venturis). They have different hole arrangements drilled though the sides of the emulsion tubes to change this effect. I am not familiar with selecting or changing emulsion tubes on Dellortos, so it may be a bit of trial and error.Scott SainParticipantOctober 16, 2018 at 12:15 pmPost count: 183
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