I got a new motor. 13b NA, street port, turbo housings, 2mm apex seals, RB under drive pulley, RB header, RB block off plate for air pump. It was built by Adom @ RX-7 Specialties in Calgary. No one seems to be able to help. The motor runs ruff @ 750 rpm. but @ 800 rpm it's ok. Put you foot to the floor and it climbs to 6000 rpm slowly, them stops. It's a lilttle ruff as it passes 3500 but it is a 13b so that doesn't bother me to much. The header and mufflers get very hot more so then normal. even after a short drive. It has no power. The idle agustment screw does nothing to the idle speed. I replaced air flow meter, tps, map, T & L coils, plugs wires, ECU, still nothing. the timing is @ 3 advanced, and there seems to be no vacume leaks. Is there a way to tell if the motor is @ top dead with out the timing marks? The main pulley is after market RB. So maybe it is wrong? I give the man that helps me a cookie. https://www.nopistons.com/forums/pub...1047683329.gif

from what you describe, i would suspect timing as long as you are SURE that there are no vacuum leaks.



was the motor built with new seals and springs?



[quote name='only3movingpartswhatcouldgowrong' date='Jul 5 2005, 10:34 PM']Is there a way to tell if the motor is @ top dead with out the timing marks?
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you'd have to pull of the main pulley and check the position of the locking key - 9 o'clock.

[quote name='only3movingpartswhatcouldgowrong' date='Jul 5 2005, 10:34 PM']I got a new motor. 13b NA, street port, turbo housings, 2mm apex seals, RB under drive pulley, RB header, RB block off plate for air pump. It was built by Adom @ RX-7 Specialties in Calgary. No one seems to be able to help. The motor runs ruff @ 750 rpm. but @ 800 rpm it's ok. Put you foot to the floor and it climbs to 6000 rpm slowly, them stops. It's a lilttle ruff as it passes 3500 but it is a 13b so that doesn't bother me to much. The header and mufflers get very hot more so then normal. even after a short drive. It has no power. The idle agustment screw does nothing to the idle speed. I replaced air flow meter, tps, map, T & L coils, plugs wires, ECU, still nothing. the timing is @ 3 advanced, and there seems to be no vacume leaks. Is there a way to tell if the motor is @ top dead with out the timing marks? The main pulley is after market RB. So maybe it is wrong? I give the man that helps me a cookie. https://www.nopistons.com/forums/pub...1047683329.gif


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Check timing via the keyway of the e-shaft being at 9 o clock..

Then do a compression check... How many miles on the motor? if the idle screw is doing nothing, it sounds like there are vacuum leaks..

Have you checked that all the VDI is operating correctly on the engine etc etc?

Start with the basics, at the top of the troubleshooting tree, verify the health of the motor via a compression check, if its not making more than 85 psi per rotor, it will be a dog no matter what you do. Then check timing, fuel, vacuum leaks so that you are 100% sure about those, once thats taken care, go into the air delivery etc....

Is the timing pin on the front cover point straight out, or is it bent towards one side of the car?...

[quote name='only3movingpartswhatcouldgowrong' date='Jul 5 2005, 11:34 PM']I got a new motor. ............ Put you foot to the floor and it climbs to 6000 rpm slowly, them stops. It's a lilttle ruff as it passes 3500 ..............The header and mufflers get very hot more so then normal. even after a short drive. It has no power.............. I give the man that helps me a cookie. https://www.nopistons.com/forums/pub...1047683329.gif


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try running it straight header and see what it does, sounds like your exhaust is being restricted (bad cat)........ could be the reason why last motor went out...also, out of curiousity check your fuel psi and pull your plugs see if they are white or wet?.........if either works.....I like peanut butter chocolate chip cookies........ https://www.nopistons.com/forums/pub...#>/biggrin.png

[quote name='jgarza77' date='Jul 6 2005, 02:22 PM']try running it straight header and see what it does, sounds like your exhaust is being restricted (bad cat)........ could be the reason why last motor went out...
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good thinking. this is also a viable possibility.

well i was in a hurry and put one of my cars back together real fast and an injector was unplugged similar symtoms

Was the motor installed by Adam as well?

If your car is exhibiting all these problems, why havn't you brought it back to rx-7 specialties to have them fix it? or did they give you some sorry assed excuse?

I'm almost willing to bet that he will tell you that your wireing harness is screwed up and you'll need either 1- a new harness or 2 - a stand alone ..



My opinion? The problem is with the motor itself.. nothing short of pulling and rebuilding it correctly will solve your issues..

[quote name='Chris Ng' date='Jul 8 2005, 04:43 PM']Was the motor installed by Adam as well?

If your car is exhibiting all these problems, why havn't you brought it back to rx-7 specialties to have them fix it? or did they give you some sorry assed excuse?

I'm almost willing to bet that he will tell you that your wireing harness is screwed up and you'll need either 1- a new harness or 2 - a stand alone ..



My opinion? The problem is with the motor itself.. nothing short of pulling and rebuilding it correctly will solve your issues..


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I thankyou for your time. But no need to call names. Could you run a shop as well as he does? I run a shop as well and I know that it is harder then you can imagine. If you your self have had problems. thats fine. Then take them up with him. The motor he built me is GREAT. I made the mistakes my self when I put it in. Missed vacume, bad injectors, timeing, broke wires. There all fixed now. But idle still off. P.S. I had turbo injectors insted so that is why it would not rev. To much fuel. https://www.nopistons.com/forums/pub...1047683664.gif

[quote name='only3movingpartswhatcouldgowrong' date='Jul 8 2005, 09:38 PM']I thankyou for your time. But no need to call names. Could you run a shop as well as he does? I run a shop as well and I know that it is harder then you can imagine. If you your self have had problems. thats fine. Then take them up with him. The motor he built me is GREAT. I made the mistakes my self when I put it in. Missed vacume, bad injectors, timeing, broke wires. There all fixed now. But idle still off. P.S. I had turbo injectors insted so that is why it would not rev. To much fuel. https://www.nopistons.com/forums/pub...1047683664.gif


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Hmmm.. I never called names..

As for his shop running well? Well.. that is a matter of opinion I guess..

As for I having problems.. It's not isolated with me.. There are plenty of people who have had problems.. more come out each day..

we've already cracked open enough of his motors and helped several people who had cars that ran and idled like crap once it came out of that shop to recognize his work..



It's funny.. the people with the least ammount of rotary knowledge seem to be the ones who always "The motor he built me was Great!" ... perhaps one day you will get an opportunity to disassemble your own motor and get first hand experience as to how "great" that motor was..

[quote name='only3movingpartswhatcouldgowrong' date='Jul 8 2005, 08:38 PM']I thankyou for your time. But no need to call names. Could you run a shop as well as he does? I run a shop as well and I know that it is harder then you can imagine. If you your self have had problems. thats fine. Then take them up with him. The motor he built me is GREAT. I made the mistakes my self when I put it in. Missed vacume, bad injectors, timeing, broke wires. There all fixed now. But idle still off. P.S. I had turbo injectors insted so that is why it would not rev. To much fuel. https://www.nopistons.com/forums/pub...1047683664.gif


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Turbo injectors is not your problem, I am running them on my n/a and its fine, in fact you find the 3800 rpm leanout dissappers with turbo injector with the addition of the header.

Are you running an automotive shop?

How do you know the motor is great, sounds to me like the stalling and idle is low vaccuum...Maxt

Do you have the right impedence injectors?

"The motor he built me is GREAT" What criteria are you basing that statement on? The fact that it runs (not well I might add)? I have limited experience but in my opinion I have yet to see a GREAt one. I've yet to see a GOOD one in fact. Just cause a motor runs doesnt make it a GREAT. And what does Chris' ability to run a shop have to do with it? He doesnt run a shop...... Adam does. That is always the arguement, the "well could you do any better"? That doesnt matter whatsoever. Chris doesnt charge for work done.



Listen I hope you get to the bottom of your problems and you get them all solved. Just take the blinders off when your trouble shooting, be sceptical of the motor as well. Don't assume it's GREAT.

Ok I get it. I didn't say that I didn't go over the idea of the motor could have a problem. I was there when they put the motor together. I didn't have a problem with there work. Thats all. I have a first gen 12a street port. I have had it for 7 years. This isn't my first rotory. the car is still on it's first engine. So I must know something about then. Being that I do 100 percent of the work my self. Yes I run an autobody and wiring shop. I just said this because sometimes people call down my work. Even if the work isn't the problem. But if there is a problem with his work why is he so busy? But that is not why I started this Post. My girlfriend is with out a car still. And I have no ideas left! I can't hear, see, or find (via carb cleaner) a leak. I not saying it's impossible but all the lines are hooked up. Is there a comon place that is a problem? I don't want to worry about what you all think of anyone. I know some might have had problems. Fine. But the motor has 90 90 90, 90 90 90 cold. sounds ok to me. So lets just figure out the problem. Cause the next time any of you have wireing or body work problems then I can give you help.

Was the motor built with all new seals?

If so they might need some time to seat and break in.



Do you have the rats nest Removed?



Check the throttle body and make sure its clean.

[quote name='only3movingpartswhatcouldgowrong' date='Jul 9 2005, 08:52 AM']Ok I get it. I didn't say that I didn't go over the idea of the motor could have a problem. I was there when they put the motor together. I didn't have a problem with there work. Thats all. I have a first gen 12a street port. I have had it for 7 years. This isn't my first rotory. the car is still on it's first engine. So I must know something about then. Being that I do 100 percent of the work my self. Yes I run an autobody and wiring shop. I just said this because sometimes people call down my work. Even if the work isn't the problem. But if there is a problem with his work why is he so busy? But that is not why I started this Post. My girlfriend is with out a car still. And I have no ideas left! I can't hear, see, or find (via carb cleaner) a leak. I not saying it's impossible but all the lines are hooked up. Is there a comon place that is a problem? I don't want to worry about what you all think of anyone. I know some might have had problems. Fine. But the motor has 90 90 90, 90 90 90 cold. sounds ok to me. So lets just figure out the problem. Cause the next time any of you have wireing or body work problems then I can give you help.


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The shop is always busy because he is basically the only shop who works on rotaries in the city.. there are alot of rx-7's in town and not alot of knowledgeable people.. so when kids buy themselves an rx-7 thinking it's the greatest thing on the planet, realize it runs poorly, they take it to the shop, get charged an arm and a leg, never get the issue solved, then sell the car to the next kid.. and the cycle starts all over again... but anyways.. let's get back to your situation..



You say you can't find any leaks, and you've confirmed timing is correct, as well as already replaced alot of the major components to try and eliminate the issue.. you sound like a competent fellow, so we can assume that there in fact are no leaks / misrouted / disconnected vac issues (not that it would cause the severity of issues you are pointing out) .. we will also rule out the motor itself at this point in time.. Are you still runninng a cat in your exhaust system? a clogged cat, or even muffler who's baffling has fallen apart could cause your power issues.. would it be possible for you to run your car without the exhaust for a quick run down the street?

Timing could also cause the problem.. too much retard would definitly kill your power and exhaust temps would rise making yoru exhaust ssystem run hot.. you are running a distributor right? is the advance working correctly?



you can't rev past 6000rpm? Hav you tried to climb past 6000rpm slowley on light throttle? or does this only occur when you are at WOT?