 Tuning dual Webers, Looking for input in the PNW |
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| TC 914-8 |
 Dec 8 2011, 09:53 PM
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#1
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Senior Member  Group: Members Posts: 830 Joined: 23-May 08 From: Sequim, WA Member No.: 9,090 Region Association: Pacific Northwest 
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I just found out my wifes coworker, The Dr Vet's husband, has a 75 2.0 with a dual Weber downdraft conversion. I stopped by last weekend to take a look. it has some minor electrical issues which I should be able to sort out fairly quick with proper diagnostics. Horn, lights etc..
One of his main concerns is mis firing and sputtering during acceleration. It is a fairly clean set up bought from a guy in Bremerton back in 2000. I forgot his name but should be active on this site. so under slight acceleration, reving the engine it sputters around 2500 RPM. with no gauges or tools I noticed the F/A screws on the driverside carb were out different ratios. I gave them a slight adjustment and it seemed to help. I figure we need a air flow meter to put over each venturi and dial in each barrel evenly. (IMG:style_emoticons/default/idea.gif) Being a V-8 guy I would slap on a vaccume gauge and adj from there.... I did not see any vacume ports so its all new to me (IMG:style_emoticons/default/confused24.gif) How do you boys dial these babys in? I was also under the impression a stock FI cam is not really compatible running carbs... (IMG:style_emoticons/default/confused24.gif) Shoot me some ideas , once I get him running, I will have a new teener buddy in the neighborhood to tool around with since you Teener Tuesday boys are afraid of coming accross on the ferry (IMG:style_emoticons/default/poke.gif) |
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| Ductech |
Dec 8 2011, 11:59 PM
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Member Group: Members Posts: 356 Joined: 16-July 10 From: AridZona Member No.: 11,949 Region Association: Southwest Region |
Some people used old sync gauges that would go over the throats of the carbs. I personally would look really hard for some vacuum ports on those bad boys and then use some sync sticks filled with mercury, or better yet a digital sync meter, like what you can get off the snap on truck. Both of the later would be better and more accurate than the old hand held sync meter. You want to be able to watch the sync and the relationship of how it changes as throttle is applied. sync sticks make this easier to see
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| nathansnathan |
Dec 9 2011, 09:40 AM
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#3
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Senior Member Group: Members Posts: 1,052 Joined: 31-May 10 From: Laguna Beach, CA Member No.: 11,782 Region Association: None |
QUOTE(Ductech @ Dec 8 2011, 09:59 PM)  Some people used old sync gauges that would go over the throats of the carbs. I personally would look really hard for some vacuum ports on those bad boys and then use some sync sticks filled with mercury, or better yet a digital sync meter, like what you can get off the snap on truck. Both of the later would be better and more accurate than the old hand held sync meter. You want to be able to watch the sync and the relationship of how it changes as throttle is applied. sync sticks make this easier to see The digital syncrometer sounds awesome, but I can't find one anywhere. I see Digital Anemometers, not sure if that's the ticket though. I've always wanted this thing as I've got some European Dellorto drla 40's with the vacuum ports. (IMG:http://www.914world.com/bbs2/uploads_offsite/www.carbtune.co.uk-11782-1323445257.1.jpg) http://www.carbtune.com/ |
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Posts in this topic
TC 914-8 Tuning dual Webers Dec 8 2011, 09:53 PM
Ductech I would start with thinking about how long this ca... Dec 8 2011, 10:06 PM
TC 914-8
I would start with thinking about how long this c... Dec 8 2011, 11:52 PM mrbubblehead i use a snail for synchronizing and an innovate ai... Dec 9 2011, 12:07 AM jaxdream Don't forget to adjust the valves before synci... Dec 9 2011, 08:42 AM rdauenhauer and there is the old standby...ditch the carbs ... Dec 9 2011, 09:51 AM stownsen914 Cars that haven't been run much can obviously ... Dec 9 2011, 11:22 AM stownsen914 Oops duplicate post Dec 9 2011, 11:25 AM messix Have I not taught you any thing?
Go give it an I... Dec 9 2011, 11:36 AM J P Stein There are a number of things that could be causing... Dec 9 2011, 11:50 AM pt_700 slightly ot but, i had an old mechanic friend once... Dec 9 2011, 12:48 PM TC 914-8 Wow, thanks guys for all the input, I like the Car... Dec 9 2011, 09:09 PM a914622 Hey i have a snail syncer i could let you use to s... Dec 9 2011, 10:36 PM mrbubblehead
Just a thought but i rigged a vacuum line back o... Dec 9 2011, 10:55 PM TC 914-8
Hey i have a snail syncer i could let you use to ... Dec 10 2011, 01:05 AM |
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