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> Dual Carb Installation, Success - She Screams
Mblizzard
post Apr 21 2013, 06:29 PM
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Well this set works. Still some work to do on the jetting but these carbs seem to at least work as they are suppose to. I could actually drive the car if I wanted to. That was not possible with the other set.

Got some 28s on the way and some additional jets. But the bottom line is that there was just something wrong with that other set of carbs.

Of course in the process of doing all of this I had the typical 914 one step forward and two steps back applies. It seems that now the ignition switch does not work!
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DBCooper
post Apr 21 2013, 07:01 PM
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Not one, two steps forward. As it always is with old cars you learn a lot of useful and not so useful things. For example you're now the local Weber specialist. Congrats.
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Mblizzard
post May 1 2013, 01:07 PM
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Ok I now have a set of 28mm Venturi's in hand and a number of various size jets. Installed the Venturi's but have not gotten the chance to start yet. Hopefully these will do the trick.
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Mblizzard
post May 1 2013, 07:55 PM
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Well I seem to have had some major success! The car is a beast with 28s. Have not driven it but it is just completely different. I got a bunch of advice from the distributor that while I am sure it was well intended, it turned out to be wrong. The advice I got from the people on this forum (mainly Kevin and George but many others also) turned out to be correct. So while I only have this one experience as a reference, I would suggest to everyone to listen to those here when it comes to carbs because they seem to know what to do.

Again thanks to everyone for their help.
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ThePaintedMan
post May 1 2013, 08:39 PM
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Great to hear! Brant, Ethan and DB know this stuff far better than I do, but I really like physics so it's just become a nerd hobby for me. Kevin is really the guy that got me to understand everything, so he is my Obi-wan and I still thank him for explaining things to me.

I betcha the 28's look ridiculously small in 44 throttle bodies, but again, physics dictates that's more what the engine needs. Who cares what they look like, right? I'm very interested to hear what the car actually drives like, since I've got a set of original Italian 44s that I'm rebuilding after I finish with Randy and Tim's carbs. These have 36 vents in them, which are right in line with Tomlinson's suggestions for our engines, but something that I've definitely considered changing when I go to sell them.
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Mblizzard
post May 2 2013, 08:54 AM
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George - They do look a little small. But while I refer to the Weber guide very often, I think I went looking for an answer. I saw 36s at the top and thought they should be fine. but after Reviewing the charts and graphs you have to come to understand it gives you a range not the exact answer. While I have been told my engine is a 1911cc I have not confirmed that. While the 36s were at the top of the range for 2 liters they were beyond what a 1.8 would like. There was something wrong with the first set without a doubt. But getting the 28s an made an amazing difference. I have reduced the main jets to 115s which I am expecting to change. But everything adjusted out at idle and the adjustment screws said the 50s on the idle jets were ok. I am leaving work early today to go for a test run. I will keep you posted.
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rhodyguy
post May 2 2013, 01:11 PM
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mike, i'm really happy this is working for you now. your engine should respond nicely when you get the final tweeks done. what size main gas jets are you going to?
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Mblizzard
post May 2 2013, 08:30 PM
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Success! Took it out for a drive tonight after an epic fail on my part. Backing out of the driveway for the test drive and it dies. Won't start. No gas in the carbs (IMG:style_emoticons/default/WTF.gif) Everything is new? Check the new rotary fuel pump. Running but no fuel in the site glass. Maybe at this point someone smart might have checked the fuel level in the tank. But I pulled out the fuel pump and installed an extra. Same result. So I put the pump in to a gas can. It pumped fuel like crazy. Yep that could only mean one thing. OUT OF GAS MORON!

Well after adding gas and reinstalling the fuel pump it was a blast and ran well but was a little weak on the top end. So I changed the mains to 135s and holy crap it screams. Still have some additional fine tuning but what an improvement over the single that was on there. Thanks again for all the help. You guys were essential to me getting this done. If we ever meet you can count on me buying the first round!
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ThePaintedMan
post May 2 2013, 08:38 PM
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(IMG:style_emoticons/default/piratenanner.gif) (IMG:style_emoticons/default/aktion035.gif) (IMG:style_emoticons/default/smilie_pokal.gif) (IMG:style_emoticons/default/driving.gif)
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rhodyguy
post May 3 2013, 06:40 AM
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'party on garth' (IMG:style_emoticons/default/piratenanner.gif) . any snapping or popping? it would be interesting to know exactly what's in the engine. with 1911 and a carb cam it should be a rever'. next thing you know you'll be looking for more top end and up sizing the vents to 30s.

k
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Mblizzard
post May 3 2013, 09:21 AM
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Not a bit of snapping or popping. I only have about 5 miles on it. I am going to go back and check the balance and sync again. In some ways I expected the same performance as my hopped up 2.0 but I just have to conclude that this is a solid 1.8 not a 2.0 that breaths fire and occasionally spits out a valve or 2.

At this point I like the low end response. But I may try some 30s sometime to see what happens.
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Mblizzard
post May 12 2013, 08:57 AM
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Had a little hesitation when accelerating. Following the Weber Tech Guide I increased the mains. Going for a short drive as iwillbe running one the battery to see if that helps.
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Mblizzard
post May 12 2013, 09:43 AM
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Wow that made a big difference. Still have a little bit of bogging at lower rpm. At about 2700 it really kicks. I am thinking I need to increase the idle jets from 60 to 70.
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Elliot Cannon
post May 12 2013, 10:27 AM
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If you increase the idle jets, I would take it a little slower. 70 seems kinda large. I had to buy a bunch of idle jets and do some experimenting. Getting the right combo. of idle jets, throttle diameter might take awhile. My webers never came off idle very well (especially when cold) until I changed a few things. Keep at it. You'll eventually get it. I also use a VOODOO doll and I had a Chumash indian Shaman say a few words over the carbs as well. (IMG:style_emoticons/default/biggrin.gif)
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Mblizzard
post May 12 2013, 01:18 PM
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Elliot I have been making offers of American car parts to the Weber god and that has been enough to ensure my changes have been positive. I am goin to decrease the air correction size first. I am at 60 so I am guessing 70 won't be a massive jump. But it is hard to tell. But the 145s seem to be good.
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Mblizzard
post May 25 2013, 12:09 PM
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Well the end point was 75 on idle jet and decrease the air correction jets to 1.65 and it is perfect. No rain makes it a great day to drive.

Pulls strong from start to end no hesitation or bogging down.

Thanks everyone for all the help.
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