willz Posted February 4, 2017 Report Share Posted February 4, 2017 I've done a lot of reading and it seems like an emulsion tube across the manifold and a cam with longer duration are almost a necessity to get it to run well. Motor is a stock L20b in a 78' 620. Could anyone recommend settings for a stock motor with a cannon manifold and a single 45dcoe as well as settings for an upgraded cam? Also which cam/from who would you recommend for something that is daily driven? Jets/tuning etc. Quote Link to comment
Draker Posted February 4, 2017 Report Share Posted February 4, 2017 I'm sure you can find a spec sheet for this carb on a 2L motor. I'd start there. 1 Quote Link to comment
Draker Posted February 4, 2017 Report Share Posted February 4, 2017 I've heard pierce manifolds offers good support. Look em up. They can get you jets and shit too. 1 Quote Link to comment
willz Posted February 4, 2017 Author Report Share Posted February 4, 2017 I'm getting a little lost on all the info on carbs, the jetting and sizes, people talking about tuning duals, or mostly running single 40's, it's been hard finding anyone running a single 45dcoe on a cannon manifold. I see a lot of lynx or whoever the manufacturer was Quote Link to comment
Crashtd420 Posted February 4, 2017 Report Share Posted February 4, 2017 That's because no one really likes the single side draft set... I would try Pierce as draker said or even Weber... Where did the setup come from? Another L20? There gonna ask questions about what you have and what it's going on... info is the key here. I would personally take the carb apart and record all the internals... jets emulsion tubest, venturi size etc. Then you can decide what you need? If your not so sure about tuning which honestly I wouldn't know really where to start either a dyno shop would be a big help.... that's what I am doing. They can see what the air fuel ratio is doing and adjust accordingly.... Two considerations: Pcv system and vacuum advance for your distributor.. I have an L16 with a single 40dcoe on a lynx sidedraft intake so its something I am dealing with too.. The port on the manifold is not correct for the vacuum advance. And my lynx had no where for the pcv.. The dizzy needs to be recalibrated to not use the vacuum.. and be all mechanical... 1 Quote Link to comment
russaroll Posted February 4, 2017 Report Share Posted February 4, 2017 http://community.ratsun.net/topic/27094-weber-dcoe-stock-jetting-information/ http://community.ratsun.net/topic/6117-weber-tuning-guide/ Quote Link to comment
Stoffregen Motorsports Posted February 4, 2017 Report Share Posted February 4, 2017 Yeah, never liked the single side draft setup. A DGV Weber is better. No joke, it actually is. 1 Quote Link to comment
Crashtd420 Posted February 4, 2017 Report Share Posted February 4, 2017 Probably cheaper and easier to tune also.. I can say from my build it will cost to make it all work right and I'm still a week away from even starting my engine and I know I am not done spending money.... can be done just in the end it will cost to make it all work correctly.. Quote Link to comment
KoHeartsGPA Posted February 4, 2017 Report Share Posted February 4, 2017 Yeah, never liked the single side draft setup. A DGV Weber is better. No joke, it actually is. I run a 48 single mikuni and it runs great and is very torqui....it's all in the tunning imo. Quote Link to comment
willz Posted February 4, 2017 Author Report Share Posted February 4, 2017 From what I understand from the person I'm purchasing it from, it was on a L20 but wouldn't fit on his 520 because of his brake booster/slaves and he ended up doing dual su's with pancake filters. So I'm hoping it's tuned at least close enough to run half assed. My reasoning behind running the single 45 is mostly cosmetic, I hate the look of the downdraft carbs and manifold, and running duals means a lot more moving parts....plus more money. I liked the clean look of the single side draft and I've seen people do it, just at the expensive of time. Quote Link to comment
willz Posted February 4, 2017 Author Report Share Posted February 4, 2017 I've been working on this truck for about 5 years, so time isn't really a concern. And I've thrown somewhere around $5k, throwing a few hundred at getting the carb working isn't a big deal Quote Link to comment
Crashtd420 Posted February 4, 2017 Report Share Posted February 4, 2017 I have to agree with you on the look of the single side draft. I like it too... if you don't mind the extra cash go for it... tuning will be the key... a good thing to check is your port match between the head and intake too... I was lucky my head and lynx intake was both 32mm.... i don't think you want the intake bore to be bigger than the head or you could create a flow issue... I am no expect.. just sharing what I've learnes so I am sure others will chime in on my comment... 1 Quote Link to comment
Crashtd420 Posted February 4, 2017 Report Share Posted February 4, 2017 Eye candy for you... 1 Quote Link to comment
KoHeartsGPA Posted February 5, 2017 Report Share Posted February 5, 2017 From what I understand from the person I'm purchasing it from, it was on a L20 but wouldn't fit on his 520 because of his brake booster/slaves and he ended up doing dual su's with pancake filters. So I'm hoping it's tuned at least close enough to run half assed. My reasoning behind running the single 45 is mostly cosmetic, I hate the look of the downdraft carbs and manifold, and running duals means a lot more moving parts....plus more money. I liked the clean look of the single side draft and I've seen people do it, just at the expensive of time. You don't want half ass, it can drill a hole in one or more pistons, if you're going to run side draft, get it tuned by a person that knows and has the tool to do it with. 1 Quote Link to comment
willz Posted February 5, 2017 Author Report Share Posted February 5, 2017 What I mean is I need it to at least run, a baseline if you will. Looking at purchasing a wideband in the near future for tuning 1 Quote Link to comment
banzai510(hainz) Posted February 5, 2017 Report Share Posted February 5, 2017 soem one had a spec sheet on a one side draft set up as a baseline. Just not into the single set up and best is get a Lynx manifold if able to find one get your money back and get a 40mm dual set up 2 Quote Link to comment
KoHeartsGPA Posted February 6, 2017 Report Share Posted February 6, 2017 Or get a 48 or 50 if you go single, use the big filter too, I had the smaller air filter and today when i installed the larger one and went for a drive, the difference was very noticeable, especially in higher RPM, no more hesitation between 4k and 4.5k :thumbup: 2 Quote Link to comment
willz Posted February 6, 2017 Author Report Share Posted February 6, 2017 I know the best way is to go with the dual set up, won't lean out the outside cylinders, easier to tune etc, but I'm dead set on running a single side draft now. 1 Quote Link to comment
KoHeartsGPA Posted February 6, 2017 Report Share Posted February 6, 2017 I don't have issues with said "issue of leaning the outside cylinders", all my plugs come out looking the same with a pinkish tone, I don't know why some people don't like cannon, the only thing I did is port matching due to the head being smaller diameter intake ports, it wasn't an aggressive grinding either, just get rid of the step for the airflow to be free of turbulence..... 2 Quote Link to comment
Crashtd420 Posted February 6, 2017 Report Share Posted February 6, 2017 Well said and good advise... seems like if the single is setup correctly people love it. One can never wrong for doing what you want it's your build... kohearts.. clean engine bay.. one question I saw the catch can for the pcv. Are both vents plumbed to it? I eventually need to do something like that but I thought only the crank breather would go to the catch can and the line on the valve cover would go to the air box or a separate filter to draw in air... 2 Quote Link to comment
Stoffregen Motorsports Posted February 6, 2017 Report Share Posted February 6, 2017 If you're set on running the single, go for it. They do look nice. Nobody wants to hear this, but the single 32/36 actually makes more power. If you think about it, the common plenum of the downdraft allows each cylinder to pull from both barrels of the carb at the same time. Not so with the single side draft manifold. If you had a log type manifold for the single, this would help. The plenum helps atomize the fuel better too. 1 Quote Link to comment
KoHeartsGPA Posted February 6, 2017 Report Share Posted February 6, 2017 Well said and good advise... seems like if the single is setup correctly people love it. One can never wrong for doing what you want it's your build... kohearts.. clean engine bay.. one question I saw the catch can for the pcv. Are both vents plumbed to it? I eventually need to do something like that but I thought only the crank breather would go to the catch can and the line on the valve cover would go to the air box or a separate filter to draw in air... Yeah I have both going to the catch can. Quote Link to comment
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