Petrol tank removal.

[A7RXY]

I will try to wire the pimary and secs together tomorrow and report back.

   Once again thanks to you all for your help.

[shaunwil]

I see you\'ve found them now in the manual.
They are simple plug in modules screwed to each side of the dizzy.
 
There are plenty of people breaking running cars due to body rot at the moment. It may be worth getting a price fro some 2nd hand ones off a known runner if new prove too costly.
 
It\'s about a 2 minute job to swap them.

Thats the ones ! I got a second hand one off pip a while ago. Wasn\'t too silly price either.

A failed ignitor is a new idea certainly worth following but if we are on a sweep then Bags I vacuum pipes to dizzy vac retard and inlet gasket/manifold system...unless I can\'t have both of these together

Forgot about that. Mine is setup in the secondary position because my throttle and carb don\'t have the vac pickup. Pip said he runs his race car that way but it uses a little more fuel. Possibly an easy thing to test if at fault.

Shaun

Shaun

[A7RXY]

Right hear we go. This morning I took off the air filter pan started the engine manually operating the secondarys and bingo it rev\'ed ok, then from the pedal it was reving around to 7500, maybe the sec\'ys were sticking, anyway engine now warm and ticking over at about 1000, not hunting, replaced air filter and still ticking over, sat in car pressed the gaz pedel and it died, thats where I\'m at the moment as it would not start again so now waiting for engine to cool and see what happens.
  One thing I did notice when the air filter was off and manually operating the sec\'y was that there only appeared to be fuel comming out of the front secondary.
 Keep you posted
     Dibs

[David Nock (RIP)]

Good news, sounds like a breakthrough. Change my bet can I?

[A7RXY]

Just got it started again, does not want to start without choke, it will rev to just under 7000 then a surge takes it round to nearly 8000, but I have to feather the gaz pedal in, if I press it straight down it just dies. the car is on axle stands at pres so can not road test it.

[A7RXY]

Both secondaries opening now and reving round to 8000, still have to feather it in thou, just the flat spot at about 1200rpm, can\'t wait to road test it, hope to do that this weekwnd.

[Ian65]

Good news!
are the secondaries opening via the vacuum signal or have you wired them to open manually?
If it\'s flat spotting, you may have a slight problem with the accellerator pump.
The function of the accelerator pump is to squirt extra fuel directly into the primaries when you accellerate. This has the effect of making the mixture richer and stops the engine from missing and spluttering.
If this accelerator pump isn’t working properly, when you put your foot on the gas, the engine will lean out as it seems to be doing.
Your secondaries should open via a vacuum signal.
If they stay shut, you lose your top end power. When you manually opened them, it revved up as we thought that it may do although it will still be lumpy if the acc. Pump isn’t working properly.
If the car has stood for a few years, you could have the passageways inside the carb gummed up with old fuel which will block out the vacuum signal to the secondaries and cause you untold grief.
You can leave the secondaries wired to the primaries if you want ( it\'s a performance mod that many owners do) but if you do you will find that it flat spots when the accellerator pump can\'t cope with the sudden demand for fuel caused by all 4 venturies opening together and you need to modify the accellerator pump to enable it to pump sufficeint fuel into the carb to give a smooth operation. If easy to do and there are loads of threads on the net about it.
The downside is that your fuel economy will suffer. The upside is that it will go like a bat out of hell!
You\'re getting there now though! Well done!
Just needs a bit of tweaking now.
Cheers,
Ian

[A7RXY]

Thanks Ian, I have not wired the two together, I chk\'d the web but could not find any info, I was on my own so I could not see if the sec opened from the pedal, but they sounded as if they did.
   I will now read up on the accellerator pump, I will not be able to work on the car again untill Friday so will have a go then.

[Ian65]

A bit of light reading on the acc. pump...
 
http://www.rx7club.com/showthread.php?s=&threadid=238028

[A7RXY]

Thanks Ian I have read through it a few times, still not sure where the acc pump is situated on the carb, when the carb was rebuilt the diaphragm should have been changed so hope either it just needs adjusting or at worst the checkballs are stuck, now all I need to do is locate the adjustment screw.

[myatt1972]

[A7RXY]

What can I say..................Thanks Keith

[A7RXY]

Update....Managed to get a couple of hours in today to chk the acc pump it was then I noticed that the acc pump rod was not connected, to conect this I had to take off the carb, two of those nuts are right B\'s to get to, conected it and refitted the carb, those nuts even harder to get back on, started the engine, yes it started, turned it off to chk the acc pump still not working, started again secondaries only work manually, the guy that rebuilt that carb for me must have been a builder cos he was no mechanic.  So thats it so far...............Anybody know where I can get a good rebuilt carb from someone who knows what they are doing, as this carb has cost me £200 so far and its turned into a pile of junk.................

      ........P155ed off of Upminster....

[Ian65]

Dibs,
don\'t let it get you down.
If it was me, I’d get hold of a carb and base plate off a running scrap car and just bolt it onto your engine. If it hasn’t been messed with, it should go straight on and the idle, emissions etc should be fine.  I think Keith ( Myatt 1972) mentioned that he may be able to sort you one out.
The alternative is to stick with your carb and either become a Nikki carb expert yourself ( which you will do eventually!) or throw some more money at it and get someone else to set it up and maybe rebuild it again. They are a complex thing to get your head around and although you’ll get to the bottom of the problem eventually, who knows how long that will take.
The only way to rebuild a carb is to do it properly, full strip, clean, re-clean, rebuild and set up. If the bloke who did yours just took it apart and then put it back together with the parts from the rebuild kit, it won\'t be a reliable carb.
A good second hand carb is much the easiest and less stressful way to get your car back on the road. An easy bolt on fix and they are readily available. Just get one of a car that you know runs or has done recently. I wouldn\'t bother getting a rebuilt one because unless you can guarantee the quality of the rebuild, you may end up back where you are now.
A known second hand carb from a trustworthy source is the easiest and cheapest way back to RX7 heaven!!

[A7RXY]

Cheers Ian, I know you said the other day how frustrating it can get..........boy were you right.