i own an 83 rx7 and need help with a certain issue that has been causing me great grief and costing me lots of money. The original engine turned its last spark some time ago so i purchased another streetport 13b to replace

the last but ever since installation havent had any success with it. the engine willrun fine coasting along at 110 - 120kmphr but accelaration is very rough and hesitant. the tacho jumps alot so theres no doubt that its spark. the coils are brand new echlins, new leads, new plugs, rotor, dizzy cap and even tried a whole different dizzy. Ive also tried replacing the oringinal modules with the bosch version and still nothing. can someone please offer any advice.

HELP

Seems like you replaced everything that provides spark to your engine.Are you sure it's not the fuel system????Might be the fuel pump or a bad fuel filter.Are you running EFI or carb setup?Another thing you can do is check the condition of your plugs.If you're not getting proper spark it might show on your plugs.Are they a bit fouled?If it's hesitating due to improper spark there should be some signs on the old plugs you had before you changed them.Check in the back of a haynes manual to see the plug conditions and reasons for the plug looking the way it does.

plugs seem to be burning cleanly. im running the stock nikki and had a guy tune it. he said that he traced the problem to the pickups in the dizzy so i got the other dizzy but no luck. he got the engine idling alright but even at idle you can notice the engine jumping slightly.

You're running a Nikki on a 13b?Are you using a adapter plate?Has the carb been rebuilt at all?Are the vaccum lines all good.You might have a vaccum leak.

Oh I forgot to mention a nikki is not a stock carb unless you have a 12a rotary.13b's came Fuel injected.Well the 6-port ones did.The 4 ports are carbed but I can't remember what carb they had.

Oh I forgot to mention a nikki is not a stock carb unless you have a 12a rotary.13b's came Fuel injected.Well the 6-port ones did.The 4 ports are carbed but I can't remember what carb they had.[/quote]

yeah its a 4 port. it is running the stock carb. have to check to see if it is a nikki but im pretty sure it is. my dad owns an rx2 capella with 12a and my carb is very similar to his but not quite the same. ive also heard that the 12a carbs are better and that ive been advised by a certain mazda mob to make the swap with an adapter plate. would an air leak make the tacho jump, i have checked all hoses but anything is possible. the trailing and leading vaccums on the dizzy join together at a tee and then lead to the carb (or manifold too dark to see right now) would this be right do you know or does it not really matter. thanks for your help

the carb had been rebuilt bythe place that did the engine as far as i know

Oh I forgot to mention a nikki is not a stock carb unless you have a 12a rotary.13b's came Fuel injected.Well the 6-port ones did.The 4 ports are carbed but I can't remember what carb they had.[/quote]

yeah its a 4 port. it is running the stock carb. have to check to see if it is a nikki but im pretty sure it is. my dad owns an rx2 capella with 12a and my carb is very similar to his but not quite the same. ive also heard that the 12a carbs are better and that ive been advised by a certain mazda mob to make the swap with an adapter plate. would an air leak make the tacho jump, i have checked all hoses but anything is possible. the trailing and leading vaccums on the dizzy join together at a tee and then lead to the carb (or manifold too dark to see right now) would this be right do you know or does it not really matter. thanks for your help

the carb had been rebuilt bythe place that did the engine as far as i know[/quote]

That sounds right.Hows the fuel pump and filter?Are they both good?Sometimes a pump might not be feeding enough fuel for good acceleration.

new pump (carter) and pressure regulator (holley red) and two new filters (under hood and at pump) c how its pissin me off.

Damn sounds like everything is new and the engine still fucks up.Where is mike or felix when you could use thier help on this.Is all the wiring the same as before???Did the old engine run good???

Hey CJ, what a **** of a problem. I've had plenty of ignition problems with customer's cars over the years, but it sounds like you've covered the bases. I've had a couple recently with worn ignition wiring curcuits/switches.[by this I mean your ignition switch inside] .Just start it and give the whole key and barrel a bit of a wiggle. I find 'wiggle tests' as I call them are quite useful.however care should be taken obviously around the secondry ignition system[ie leads/plugs]when it's running. You may have accidently damaged or squashed a loom when doing the swap. I've found from experience, mazda looms do become quite brittle with age, so sometimes even moving it out of the way can cause a break.

Just check that the carb hasn't been removed as I have found,certainly over here, that there are different types of four port 13b carbs. Also some of these carbs have a very fine guaze filter inside the banjo bolt on the top of the carb[where your fuel lines go in]. Basically just remove it to check for any junk in it.Even if it doesn't look too bad, just clean it out anyhow. I've seen that cause many a problem.Good luck.

just about to go check. hopefully the new day brings me luck. thanx for the help.

oh yeah the old engine ran great. like a rotary should. i'm not given up on this one after having been bitten by the rotary bug.

Thats the spirit CJ.Make the rotary live on to see another day. :bigthumg: Props to you for doing your own work.I love a DIY. https://www.nopistons.com/forums/pub...#>/biggrin.png Why pay someone to work on it when you can yourself?

hey guess what. she goes. when i wired the bosch ignitors i cut off the original wiring and left it sitting then rewired the bosch ones seperate. the other day i got another dizzy with original ignitors and rewired them to the factory wiring set the timing and away it went. so if was the wiring being left open from the original circuit or if one of the bosch ingnitors was a dud, i don't know. but it goes. thanx for all the help and advice and know doubt youll here from me soon.

hey wooffinn im in qld. do you have a shop and if so whats it called.

Hey CJ, I'm a mechanic of about 13 years now, hopefully will have my own shop soon. I'm the treasurer of the 'Seven of clubs' Mazda car club of Qld so I quite regularly get to play with all sorts of the mighty rotors. Where abouts are you?? Queenslanders in the house!! Just watch that Mazda/rotary bug, it bit me 14 years ago now and the tally at the moment is 58 mazdas since then,38 of them have rotated. There is no known treatment or cure but it beats the **** out of collecting stamps!!!LOL

cool. how do i join. i live in a small town (pop. 3500) called Gayndah about 4hrs from brisbane, 1 1/2 hrs from bundaberg. so i am the only rotary in my town. ha ha ha v8s.

by the way just got my red 83 7 registered today. what fun it is.

It had to have been something on the trailing side making your tach jump like that.

Hey CJ, I know exactly where Gayndah is mate, been there quite a few times in my younger rallying years. Fantastic citrus fruit comes from there.We're trying to expand everywhere,so yeah we'd love to hear from you. it Would be great to have a representitive from there, you can be our contact man! We except all sorts of Madzas and other 4 Cyls rockets as well so if you know of other owners they're more than welcome. Just drop me a PM and I'll get some info/membership forms to you.

hey wooffinn email me at cjwalker81@hotmail.com

or 43 Bamboo St.

Gayndah QLD

4625

greatly appreciated.

Hey CJ, I'll get some forms in the mail for you. Thanks again!!

ahh .They hooked up....https://www.nopistons.com/forums/pub...#>/biggrin.png





Thats good...This site is good for finding people in your area then meeting up to help each other..