BRE_dAtSuN Posted February 16, 2011 Report Share Posted February 16, 2011 Getting my Edelbrock uni syn tool today and was wondering if anyone has any experience using this tool...any tips or advice or is it pretty much straight forward follow the instructions... ?? Please and Thank you Quote Link to comment
SublimeDatsun610 Posted February 17, 2011 Report Share Posted February 17, 2011 its pretty straight forward. there is a really good youtube vid on tuning SU's. looking for link.... will post is i find it. Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 i couldnt find the vid... but i place it over cylinder one air horn and turn the adjusting screw all the way in and out and messed with the idle mixture screw in and out and i couldnt get it to read anything... the float never moved... do i need two at the same time on mikuni's... i tried covering the 2nd air horn on the same carb and nothing tried messing with the idle... im not sure whats happening ....im gonna keep researching but im suck Quote Link to comment
banzai510(hainz) Posted February 17, 2011 Report Share Posted February 17, 2011 the unisyc does nothing for the mixture screws Its only to make sure both butterflys open at the same time.THATS IT!!!!!!! On my mikini set up i do the 2 inner most horns. I rev the car up to about 1500 to 2k and I put the sync on and see where the ball/needle goes before it kills the airflow. There is a adjustment for this to let a certain amout of air on the sync. to let more or less air thru the sync. But I just keep a constane rev and see what one carb does. You will try to match them up. and then see where its at at idle. the carbs will have a idle stop screw that can be adjusted also.at least mine do. adjust between carbs you adjust the arms f you have qa 2 arm set up. or if its a center pull set up youll have to adjuts the stop and there will ba a tenstion screw type set up to adjust between the carbs, and the idle stop. Unisync dont adjust mixture. this youll need a exhaust O2 set up oe do a best guess on that. 1.5 turn from bottom? Im only guessing Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 ok thanks hainz yea... i was reading and reading all last night and i figured i would do 2 turns on mixture screw since thats what i had it at before and it was working fine... then rev it up to about 2k and i nead to match the 1 and 3 and the 2 and 4... so ima do that today.. once again thanks hainz Quote Link to comment
banzai510(hainz) Posted February 17, 2011 Report Share Posted February 17, 2011 i do the 2 inner runners. so that would be 2 and 3 2 of the first front carb and 3 the rear carb set i use the unisync. I have to assume the butterfly plates are the same for the ajoining one so no need to measure them unlkess you think a plate got bent from 1 and 2 as its in the same carb. hope you understand this. If plate /shaft is bent on one carb(1&2) or #&4) then youll never get them correct. I assume you have dual choke sidedrafts like a DCOE. or Mikuni PHH series. example 1 carb has 2 barrels. I have to assume the plates are exactly the same when they open. Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 yea correct... ok well ok so i rev it to two and place it on 2 then i adjust the uni syn until the float is in the middle... then while without moving anything i check 3 and it should be the same... and then do the same for 1 and 4 Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 question... if they are not the same... what do i adjust... since you are saying it has nothing to do with the mixture... lets say they are out of balance..would the cause symply be a bent plate or can i adjust it? Quote Link to comment
banzai510(hainz) Posted February 17, 2011 Report Share Posted February 17, 2011 I do 2 & 3. I put it on for a second or two. what usuaully happen is the ball will go to a certain point. Just remeber that point then it will usually lower abit. I do the high part of where the ball was it. and go between cylinders2 and 3 till you get it even. if you want to ck 1 and 4 thats up to you. Maybe 1and 4 is better as its the far most plates to ck. But this is what I do. as for adjustment I dont know what you have. I dont know if you have a 2 rods the push the carbs or you have a Center pull system. The DCOEs might even be slightly different system. youll have a to post a photo or just figure it out how your linkage set up works. My Mikinis has 2 rods that push each carb. at the ends its threaded like a turnbuckle. turn it in/out to make the rod longer or shorter. then there is a idle stopper adjument. My Yellow car has a center pull system but to lazy to expplain it!!!!!!!! Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 well i have the 2 rods that push each carb... its an l20b with 87mm flat tops u67 ported polished big cam dual springs... it has like 3500 miles on it i have the timing a bit retarded and some colder plugs... ill post of pic of my carbs... i think like 1 and 3/4 turns on the mixture maybe as a ball park or 2 turns. [/img] Quote Link to comment
banzai510(hainz) Posted February 17, 2011 Report Share Posted February 17, 2011 yes you would ajust the rods. its like a turnbuckel. loosen the jam nut on both side and turn the center part cw/ccw wise to get what you want. Looks like a turnbuckle Im not totally positive as photo is so so. otherwise its lock the arms in the correct spot on the horz bar als at the base of carb near the bottom of the rods there is a stopper,you can adjust that also ,this tell how much the plate is open(when its closed) this sets the idle speed. Might be hard but you get the idea. since you have a L20w/flttops dont you have detonation proplems? most dual carbs you want 12-15 intial adv. You should run good gas in this otherwise you ight really have to retard the ignition but you wont get full power. Im sure you put 100octanne and adv to 12-15 it goes good! Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 yes when i ran 100 octane and 15 degrees advanced the motor felt strong but when i would go past 1/4 throttle it feels like the carbs arent balanced and struggles then when i get to full throttle it just pulls amazing but i would like to be able to open more than 1/4 throttle and not have the carbs stumble in the case of hills or freeways and such... so ill check if the rods are adjustable and if not i would just adjust the stopper correct? Quote Link to comment
banzai510(hainz) Posted February 17, 2011 Report Share Posted February 17, 2011 well it might not be carbs are that far off usually they spit ans spatter a bit if ot ballanced. You can tell by looking if one arm is opening the carb more than the other. Could be a jetting issue I think if you have 44s you want close to 240 air and about 160main would be a base line. My 40s are 160 air 135 main make sure the jets are screwed down and nothing blocking them. Maybe pull out the jet blok ans see if anything blocking. You sure your cam is timmed?If a L20b you probaply want to start on sprocket #2) make sure the marks line up. If OK , Maybe try another distributor(I am reaching on this one but you never know) 1 Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 good things .... cam is on #2 and timed... ill take the jets out to make sure what they are... as far as dizzy it could be but i would think when i floor it it would still give issue correct?... when its floored this little motor roars Quote Link to comment
banzai510(hainz) Posted February 17, 2011 Report Share Posted February 17, 2011 open more than 1/4 throttle and not have the carbs stumble in the case of hills or freeways this is a key statment, thats you mentioned aligned the carbs best as you can. Mikunis (I Believe) have a low/med and high speed circut. might be a trasition issue. so I would be just guessing but since you have a HI comp L20 which I do not like for the street when running pump gas. You mostly retard the dizzy to keep from pinging. But really you want the most adv as possible right up till it pings. So add these factors, possible a Dizzy adv issue, and maybe a slight jetting issue could combine to be a big thing.since these are 44mm carbs I assume you dont have a vac adv(i never seen one). If you do make sure its to the carb and not the intake manifoldgood luck as Im out of guesses. Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 k thanks... well im going to align the carbs as best i can... i do have the timing set as close to pinging as possible as it still pings a little tiny bit on occasions... if balancing them doesn't solve the stumble... ill look into the jets and a new dizzy Quote Link to comment
BRE_dAtSuN Posted February 17, 2011 Author Report Share Posted February 17, 2011 ill keep you updated Quote Link to comment
banzai510(hainz) Posted February 17, 2011 Report Share Posted February 17, 2011 maybe a faster adv dizzy But Iam only guessing. I dont know your motor. Quote Link to comment
BRE_dAtSuN Posted February 21, 2011 Author Report Share Posted February 21, 2011 so i balanced the carbs and it was off because the arm pushing the rod was closer on the second carb then straight up like the 1st so i loosened and aligned them... now is feel alot better but i do believe i need bigger jets as it seems to be running lean Quote Link to comment
banzai510(hainz) Posted February 21, 2011 Report Share Posted February 21, 2011 150 to 160 main should be close and 180 air should be close enough. Quote Link to comment
BRE_dAtSuN Posted February 21, 2011 Author Report Share Posted February 21, 2011 150 to 160 main should be close and 180 air should be close enough. k thanks... ill check tm when i get a chance whats in there right now Quote Link to comment
BRE_dAtSuN Posted February 27, 2011 Author Report Share Posted February 27, 2011 alright guys update... i installed a new hood release cable... took out the jets and cleaned them ...they are main air jet say 210 on top and at bottom 165...pilot jets say 165 all others same... is this good or any suggestions?... it is cold today and i went to del taco man it ran like a champ... and the 510 lift cam transitions really nice Quote Link to comment
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