phatdave Posted April 17, 2011 Report Share Posted April 17, 2011 Anybody ? This photo shows where the dist. is getting vacuum . It's not coming from the carb its from the intake manifold. Is that right ? Is that why it was backfirng ? It's the brakeline at the bottom. Quote Link to comment
banzai510(hainz) Posted April 17, 2011 Report Share Posted April 17, 2011 loks like you have a weber DGV. there should be a port at the base of the carb(on the carb itself) this will go to the vac adv on the dizzy. early model dizzy might have a threaded type set up. I just rig a hose to fit over the threaded part Looks like a J motor you have there. The metal line to the intake goes where? I am not familiar with J motors myself. if goes not where I assume it better be plugged.But it shouldnt go to the dizzy if it is as it will cause it to adv to much. But Im not a J motor expert Quote Link to comment
phatdave Posted April 17, 2011 Author Report Share Posted April 17, 2011 Hainz that a brand new carb. The brake line you see goes to the dist. I would like some photos from a J13 to see where theirs goes. Thanks. Quote Link to comment
wayno Posted April 18, 2011 Report Share Posted April 18, 2011 The vacuum for the dist. comes off the bottom of the weber, not off the intake manifold. Here is a few oics. of the J15 engine I have. Quote Link to comment
phatdave Posted April 18, 2011 Author Report Share Posted April 18, 2011 Wayno, would you be so kind as to take a photo like mine..oriented from the drivers side fender shot toward the top/back of the intake mani showing the line shown in my shot? the one with the brake line ( in my photo) Quote Link to comment
boxboy Posted April 18, 2011 Report Share Posted April 18, 2011 Dave, if I get time tomorrow I will take some pictures. However, I can tell you that the line that you have coming off the intake plugged with the screw goes to a gizmo that mounts to the firewall that some folks on here say is a altitude compensator of some kind. The vaccuum from my distributor to my original Nikki carb screws into the base of the carburetor on the valve cover side of the carb. Quote Link to comment
boxboy Posted April 18, 2011 Report Share Posted April 18, 2011 Ha! That was your post about the altitude compensator. Anyway, if I get time I'll get you a pic. But I don't have a weber. I have a Nikki. Quote Link to comment
mklotz70 Posted April 18, 2011 Report Share Posted April 18, 2011 Dave....I posted the answer to this in your other thread explaining why the vac signal can't come from the mani. I just happened across this thread and did not get a notification...I'm only subscribed to 2 or 3 threads on this forum any more. :) Quote Link to comment
wayno Posted April 18, 2011 Report Share Posted April 18, 2011 This is the rear shot, see the outlet in the manifold with the white cap on it, that is where it is on my manifold, and it is capped off. That screw/bolt almost touching the valve cover is my choke cable attachment point, below that is where my dist. vac. attachment point is on my carb. Quote Link to comment
phatdave Posted April 18, 2011 Author Report Share Posted April 18, 2011 ...and she purrs now. Now problems with carb space/clerance betwixt the carb and the valve cover. Quote Link to comment
mklotz70 Posted April 19, 2011 Report Share Posted April 19, 2011 That's awesome Dave!!! Glad to see it all worked out for you. :) Quote Link to comment
wayno Posted April 19, 2011 Report Share Posted April 19, 2011 ...and she purrs now. Now problems with carb space/clerance betwixt the carb and the valve cover. I have the same issue, but that engine isn't in anything at the moment, so i'll deal with it later when I have to. What exactly are your clearance issues, the choke? Quote Link to comment
phatdave Posted April 19, 2011 Author Report Share Posted April 19, 2011 Meant to say NO problems...sorry. Quote Link to comment
phatdave Posted April 20, 2011 Author Report Share Posted April 20, 2011 I am in need of a longer throttle cable. I called about a universal cable kit and found one for SEVENTY DOLLARS. Bull-shit. So I start thinking ( yeah,yeah,yeah )...Ill quit thinking soon. My idea was to use a Ernie Ball low E guitar string. Which will work except for the end that hooks up to the gas peddle. It's just a bit small.... So how do I fix this problem ? Here is where a good idea gets great. I will buy the correct size split shot , for fishing, and crimp it onto the pedal end of the cable. You know, where it fits into the slot there. I just saved 65.00$ :D She runs fine as far as I can tell. Of course she isn't under a load , however there is ZERO backfiring. So Mklotz, here is the info you wanted. A Weber 32/36 will work on a J13 Datsun.The dist. is getting whatever vacuum it needs from the exhaust mani. My olde mechanic friend that said it might work that way seems to be correct. I will contact him about more information as to why this might work. Quote Link to comment
mklotz70 Posted April 20, 2011 Report Share Posted April 20, 2011 So...you have the dizzy vac line hooked up to the exh mani? It's not getting the signal it should, if it's getting any at all. My guess is that it's a J13.....it's not a fast revving engine. The mechanical advance is probably doing all the work. Without checking the timing and such, I couldn't say where things are at. But....they are very forgiving motors......at least my E1 was (same as j13) so it's it's running good....awesome!!!! Drive it and enjoy it! :) Quote Link to comment
mklotz70 Posted April 20, 2011 Report Share Posted April 20, 2011 Awesome creativity on the cable Dave!!! Love it! :) I don't have your other thread handy....didn't you say this carb was ordered for a specific engine? Did it come from the factory, jetted for a small eng? What I'm getting at is if this carb was jetted for a specific motor that is smaller than the 2.3L they are normally jetted for, did they send a list of the jet sizes? A list of what jets are in the carb would help others trying to put a DGV on such a small motor. :) Quote Link to comment
Charlie69 Posted April 22, 2011 Report Share Posted April 22, 2011 Dave Bicycle & motorcycle shops make cables. This should help on some of your Weber Questions, sorry it took so long to post this Dave Quote Link to comment
banzai510(hainz) Posted April 22, 2011 Report Share Posted April 22, 2011 phatDave I know you menat Intake manifold when you said the dizzy is hooked up to? NOT Exhaust manifold Quote Link to comment
phatdave Posted April 22, 2011 Author Report Share Posted April 22, 2011 phatDave I know you menat Intake manifold when you said the dizzy is hooked up to? NOT Exhaust manifold Hainz, Yes intake is correct. Did I say exhaust somewhere on this thread ? If I did say exhaust it was just the prescription pain killers getting to me... :P Quote Link to comment
mklotz70 Posted April 23, 2011 Report Share Posted April 23, 2011 Doh! That should have dawned on me too!! The intake mani will still give you the opposite signal of what you want for that dizzy. Yes, they do make vac advances on cars that work off the mani vacuum. Some of the hondas I've had used both. Quote Link to comment
phatdave Posted April 28, 2011 Author Report Share Posted April 28, 2011 What are there relay looking goodies on the fire wall ? Are they just that relays ? Quote Link to comment
banzai510(hainz) Posted April 28, 2011 Report Share Posted April 28, 2011 olddatsuns.com has the 521 schemantic maybe match the colors up but I would say Horn for one of them.High beam relay? Disconect one then try out the stuff to see which dont work Quote Link to comment
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