wayno wrote:
Are you talking about the throttle linkage that goes from the linkage on the firewall to the throttle linkage on the intake manifold?
Yup!
That's exactly it!
I put it in and when it would fit, the linkage would be turned as if I was pressing gas.
I learned the hard way when i turned the car on and it roared.. lol.
I turned the metal piece straight and it works as it should although the gas pedal link was too long and couldn't connect to the throttle linkage.
Sorry if that doesn't make sense.
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
wayno wrote:
Are you talking about the throttle linkage that goes from the linkage on the firewall to the throttle linkage on the intake manifold?
Yup!
That's exactly it!
I put it in and when it would fit, the linkage would be turned as if I was pressing gas.
I learned the hard way when i turned the car on and it roared.. lol.
I turned the metal piece straight and it works as it should although the gas pedal link was too long and couldn't connect to the throttle linkage.
Sorry if that doesn't make sense.
You are not likely going to be able to buy that from the autoparts store, you will likely have to shorten/cut the one you have and weld it back together the needed length, you might be able to cut it and sleeve it also, but you are likely going to need it welded at some point.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
wayno wrote:
Are you talking about the throttle linkage that goes from the linkage on the firewall to the throttle linkage on the intake manifold?
Yup!
That's exactly it!
I put it in and when it would fit, the linkage would be turned as if I was pressing gas.
I learned the hard way when i turned the car on and it roared.. lol.
I turned the metal piece straight and it works as it should although the gas pedal link was too long and couldn't connect to the throttle linkage.
Sorry if that doesn't make sense.
You are not likely going to be able to buy that from the autoparts store, you will likely have to shorten/cut the one you have and weld it back together the needed length, you might be able to cut it and sleeve it also, but you are likely going to need it welded at some point.
Noooo.
I can't weld.
Time ti improvise.
I had this idea of bending the metal piece that goes into the firewall on the top that has the bulb.
Would that be okay?
I tested and it wouldn't be hitting anything and would be turning with the pedal as well.
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
I'm not there to see what you are talking about, see if you can find another 510 linkage to modify, but if it is to long, you likely will have to shorten it by cutting it.
How much to long is it?
I surf a lot, sometimes it takes me a while to notice you replied.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
wayno wrote:I'm not there to see what you are talking about, see if you can find another 510 linkage to modify, but if it is to long, you likely will have to shorten it by cutting it.
How much to long is it?
I surf a lot, sometimes it takes me a while to notice you replied.
Don't worry about the late replies man!
and it's maybe 2-3 inches too long?
I need to find a short one.
I'll see if i have any luck at autzone because it's on the way to dmv and my dad needs anti-freeze so if not there, I'll have to improvise.
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
wayno wrote:I'm not there to see what you are talking about, see if you can find another 510 linkage to modify, but if it is to long, you likely will have to shorten it by cutting it.
How much to long is it?
I surf a lot, sometimes it takes me a while to notice you replied.
Don't worry about the late replies man!
and it's maybe 2-3 inches too long?
I need to find a short one.
I'll see if i have any luck at autzone because it's on the way to dmv and my dad needs anti-freeze so if not there, I'll have to improvise.
another thing.
my gears are super sloppy and difficult but my friend told me he had a plate that stopped the play on his bug?
is there such thing for 510's?
It'd help a ton.
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
wayno wrote:I'm not there to see what you are talking about, see if you can find another 510 linkage to modify, but if it is to long, you likely will have to shorten it by cutting it.
How much to long is it?
I surf a lot, sometimes it takes me a while to notice you replied.
Don't worry about the late replies man!
and it's maybe 2-3 inches too long?
I need to find a short one.
I'll see if i have any luck at autzone because it's on the way to dmv and my dad needs anti-freeze so if not there, I'll have to improvise.
another thing.
my gears are super sloppy and difficult but my friend told me he had a plate that stopped the play on his bug?
is there such thing for 510's?
It'd help a ton.
Do you mean your shifter is sloppy?
The issue with the dual SU 510 linkage is that most of these SU packages came over to the US on used engines, they did not come with the linkage you need, so everyone either modified there linkage, or bought it from Nissan.
There is likely a place you can get the linkage you need, but I know nothing about 510s, so you need to pick a 510 owners brain, maybe Laecaon can help/point you in the right direction.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
wayno wrote:I'm not there to see what you are talking about, see if you can find another 510 linkage to modify, but if it is to long, you likely will have to shorten it by cutting it.
How much to long is it?
I surf a lot, sometimes it takes me a while to notice you replied.
Don't worry about the late replies man!
and it's maybe 2-3 inches too long?
I need to find a short one.
I'll see if i have any luck at autzone because it's on the way to dmv and my dad needs anti-freeze so if not there, I'll have to improvise.
another thing.
my gears are super sloppy and difficult but my friend told me he had a plate that stopped the play on his bug?
is there such thing for 510's?
It'd help a ton.
Do you mean your shifter is sloppy?
The issue with the dual SU 510 linkage is that most of these SU packages came over to the US on used engines, they did not come with the linkage you need, so everyone either modified there linkage, or bought it from Nissan.
There is likely a place you can get the linkage you need, but I know nothing about 510s, so you need to pick a 510 owners brain, maybe Laecaon can help/point you in the right direction.
yes extremely sloppy and it bugs the hell out of me!
Interesting.
I'll have to ask some one but first, I'll see what i can do myself.
Thanks man!
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
Ok so if you're talking about a plate for the shifter like this:
It's called a gated shifter. I highly doubt you'll be able to find one for a Datsun but with enough money, anythig can be made.
I have seen a metal piece like this on a throttle arm (old Chevy, holley carb blah blah) that seemed to work for him. I don't know what it's called or where to get it (I know, big help right) but maybe it can give you an idea.
Of course cutting and welding would be better. If something happened to my throttle response this is the first thing I would check.
exhaust.
now thinking about it. the rpm thing could be the linkage that's connected to the pedal not being tightened and long enough.
but even with that... maybe a little gas could keep going and going raising the rpm's....
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
If you force the linkage back to idle, does it return to idle or keep/start revving again?
Does the throttle linkage have smooth free movement and return easily back to the idle position?
If you remove the throttle linkage you added on, do all the issues go away?
Back firing usually means it is running rich, but it can be other things causing it also.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
wayno wrote:If you force the linkage back to idle, does it return to idle or keep/start revving again?
Does the throttle linkage have smooth free movement and return easily back to the idle position?
If you remove the throttle linkage you added on, do all the issues go away?
Back firing usually means it is running rich, but it can be other things causing it also.
I didn't check what happens if I force it.
I will this weekend. unfortunately, I have school and work the next straight 5 days. :/
The throttle linkage was bad until I made it longer then the problems went away.
after turning it on once or twice, problems returned.
from what I believe, I need a tune from some one better at it.
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
OK, when you get back to working on it, check to make sure that both carbs move at the same time when you twist on the throttle, they must move at the same time, there should be a screw on the back carb for that adjustment by the linkage that goes strait down to the back carb.
I don't see the engine jumping around, so it must be idling somewhat smooth.
When you adjusted the carbs the first time, when you disabled the front carb and it ran off the back carb, did you screw the mixture screw in till the engine barely idled?, it needs to "chug, chug, chug, chug, like it almost is going to die, then you do the same thing to the other carb till the "chug" sounds the same, you are trying to get it as lean as you can without the engine dying, that is how I do it, and my engine runs pretty good.
What fluid did you put in the top of the carbs?
Again, the carbs have to move at exactly the same time.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
wayno wrote:OK, when you get back to working on it, check to make sure that both carbs move at the same time when you twist on the throttle, they must move at the same time, there should be a screw on the back carb for that adjustment by the linkage that goes strait down to the back carb.
I don't see the engine jumping around, so it must be idling somewhat smooth.
When you adjusted the carbs the first time, when you disabled the front carb and it ran off the back carb, did you screw the mixture screw in till the engine barely idled?, it needs to "chug, chug, chug, chug, like it almost is going to die, then you do the same thing to the other carb till the "chug" sounds the same, you are trying to get it as lean as you can without the engine dying, that is how I do it, and my engine runs pretty good.
What fluid did you put in the top of the carbs?
Again, the carbs have to move at exactly the same time.
I'm aware they have to be incredibly synchronized.
there was already fluid in them so I did not bother changing it out.
it seemed to be fine and I asked a friend and he seemed to agree. but then again, we're both young.
No, I screwed the mixture more so to the point that it was a bit smoother.
from what you hear, are they incredibly rich?
but it's nothing from the matchbox correct?
thanks man
Just a kid with a love for datsuns and no money.
4 doors riding slow and hangin loose.
I have not tuned SUs but have tuned plenty of dual carb setups on different makes.
Lots of good SU advice here and in the dual carb thread.
Take what Wayno says as The Bible.
When opening, they need to react the same. Not late or early. Timed in unison.
One can not hear a rich or lean condition.
Does it sound like 1 is sucking more air than the other?
A UniSync tool is your friend.
A long piece of vacuum hose is like the neighbor kid you don't dislike on a rainy day.
Listen to the openings.
From what I understand, these should just barely be hissing at idle.
Make both of them sound the same.
Someone correct me if I'm wrong. I'm still learning about SUs myself.
Do you have a timing light?
To be backfiring-your timing is off.
I cannot tell if mine is rich when running, I look at the color of the plugs for fine tuning, if it runs without hesitating when cold while giving it the gas, it is likely rich, mine will stumble when cold without the choke being on.
If you do not feel any resistance when putting the top plunger of the carb back in it's hole, then there is not enough fluid in it, if they do not have enough fluid in them, it will run like crap, like the engine needs rebuilt, they open to fast when dry.
The fact that you have to push on the throttle linkage to get it to return to a reasonable idle means something is binding, or not adjusted correctly, and most of us would have to be there to diagnose the problem, otherwise we are just guessing.
It would likely not run if the matchbox had something wrong with it, but a worn dist. shaft could cause problems, but I have no first hand knowledge of that issue.
Just because it runs doesn't mean that the carbs are good, I had a set that ran just fine, but were not adjustable, I could close the rear carbs fuel mixture all the way tight, and it would not die, that is what I call a un-serviceable carb, it is not adjustable anymore, and needs rebuilt, I actually go to far when adjusting them, then I open it back up till it will barely idle, then I do the other carb the same, that is how the manual directions described the adjustment, at least that is how I interpreted them, when I took my truck to a datsun race guy, he said I almost had them perfect.
“The difference between genius and stupidly is that genius has its limits” Albert Einstein
