How Does Vacuum Advance Work? 12A - 13B Mazda RX7 Distributors

[@samgarcia2207]

Just a small correction brother, the SA 1980 distributor cap and rotor button is the same as the 81-85 model. The igniters are J106 models.

[@RADPotential]

Really!!!! Thats awesome!! Ill pin your comment. Thank you so much. It was been a minute since I had the 1980 dizzy in front of me. Last time I'd have seen it was when I removed it from my 1980 lol!!!

[@perjian1697]

if you run trailing timing close to the leading timing so the ignition event happens almost on top of each other with no gap, gets you a little cleaner smelling exhaust and a smidge more throttle response.

[@clubnightparade]

I needed this I'm going carb on my fc and I'm tryna figure everything with it out so I appreciate it, I'm new to carb stuff and this was great

[@wiredbygaz]

Great video as usual. A NZ rotar tip I was told is to remove the metal cover under the dizzy as helps disapate heat, maybe make the ignition modules last longer.

[@MorganizerT]

Love the vid! Would like a bit more explanation about why/when to lock the centrifugal advance and how you decide wether to run the vacuum advance.

[@RADPotential]

I'll have to do some digging and testing on running a locked distributor. I have never messed with it before. But I know some folks who have. It's on the list!!!

[@CowbellCustoms]

@@RADPotential I'm likely going to be running a locked distributor for my 12a turbo engine. Mainly trying to prevent advance under boost.

[@seaturtle828]

Awesome video man all the information we could need.

[@jackkrupka3024]

Love the content! That was very helpful and informational

[@oSrBo]

I know im late to the party, but Thank you for your knowledge!!

[@benbradshaw29]

I needed this!

[@Morodizal]

Your the man! Thanks for making these videos!!

[@RADPotential]

You got it man!!

[@cw_outdoor_adventures]

Great video man!

[@Bmxfmxsnowboarder323]

Thank you good sir

[@chrisdugas1186]

I have a type 3 Distuributor and a Type 2 . The type 3 is the one that I am running. but the type 3 has the right area of timing between the gears without enough rotation in the distributor to get to the right timing in the right area. Using a vacuum pump advance the timing after starting. but trying several options without great result. Does not advance the 15 degrees that the book says it should. I tried a MSD 6 A _2 digital that should have a computer timing delay , but neither MSDF 6 box works with this engine. Any suggestions besides enlarging the adjustment hole.

[@peterjacobson4593]

Wouldn’t you want to hook up the pots to ported vacuum rather than manifold vacuum. Because if it’s hooked up to manifold then they would advanced the whole time, right?

[@perjian1697]

as soon as your carburetor or throttle body is opened past maybe 10 or 15% there is no vacuum anymore. there is suction obviously, it's sucking in air and fuel. but the vacuum at idle is about 20-25 inches and once the throttle plate is opened past tip in, the vacuum drops to 0-2 inches. Not enough to move the dash pots on these dizzys.

[@glenvanderperk9918]

When you set your timing at idle is that with vacuum advance pods hooked up? Thanks for the great videos!

[@RADPotential]

I set the timing with the pots disconnected at idle. You can anticipate the built in advances to add 10 degrees of timing from whatever that base number is.

[@glenvanderperk9918]

@@RADPotential thank you, that will help! I currently have it set to zero degrees at idle with vacuum advance pots hooked directly to manifold, no rats nest.

[@BrycenKauai]

great video as always! Ive got a gsl-se with a deleted rats nest. It runs great with vacuum advance pots disconnected and vacuum open to air. When I plug the vac port it idles too low and stalls, when i connect the vac pots it revs up to 3k on its own and doesnt respond. any thoughts?

[@perjian1697]

you've got a whole different conversation of problems there. did you ever square it all out and get it running properly? best of luck.

[@BrycenKauai]

@@perjian1697 I did, it came down to about 5 little things(mostly vacuum related). For clarification, I was finishing up swapping the SE motor into a GS. Rats nest had been deleted by the previous owner of the SE but the car ran great before i pulled the motor.

[@tyupton1719]

Advantages/Disadvantages of running zero split on leading/trailing? Im running it with an MSD on my 80. Still havent got the car to run to be drivable so I cant tell a difference lol.

[@RADPotential]

I can ask my Tuner friends and see what their thoughts are. I have heard of that in the boosted world. But I can't remember if it's a common practice or not. Or the benefits

[@tyupton1719]

Much appreciated. Main reason I did it was so I didnt have to run a second MSD box. Doubt itll make any power as im running a nikki and stock port for now.

[@allmotorproductions4773]

I’ve got a sniper and it showed my timing bouncing from 15-36 degrees at idle why lol help it’s a full bridge 12a

[@TheJazzdr]

When you say "more timing" you actually mean more advance on the timing, a small point, I think everyone knows what you mean. I have a stock 79 sa, I don't see any point in changing distributors because I had so many problems with the igniters on my 84. was stranded many times when they failed, and had to carry a spare with me. yeah, points wear and that throws off the timing, but it was the standard for a lot of years.

[@TheJazzdr]

also for beginners that might not know what you're talking about you could maybe explain the terms: (spark) timing, TDC, BTDC,... as they relate to rotaries and performance

[@benbradshaw29]

my streetport 12A does that missing and bad fuel economy thing, but it ran like crap before I advanced the timing a bunch.

[@RADPotential]

That's awesome!!! Plus a bit better top end pull??

[@benbradshaw29]

@@RADPotential oh the top end is perfect. once the secondaries open up the car is absolutely incredible. It hits this harmonic frequency as it passes 7 grand that I can't put into words, it sounds like heaven.

[@benbradshaw29]

@@RADPotential It's also a little tough to start cold, especially because I don't have the choke hooked up.

[@thelalala]

Do you know why there would be coolant on top of the engine? I have to keep refilling coolant from time to time.

[@RADPotential]

Leaking between the intake and the block, 12a.... or leaking from the back of the water pump, or leaking from the throttle body....13b

[@garbanzobean2479]

I have a 82 and I can't get it to stay running! Rebuilt the carb new fuel pump n filter! It starts and runs for a minute or two and then just drops in rpm an kills any help/advise?

[@RADPotential]

Is it flooding?? Can you see fuel dripping out of the venturis while it's just idling?

[@landocalriziosgaming8989]

Is there any websites that sell exterior parts for these cars like fenders and taillights?

[@RADPotential]

Not really. There isn't a big aftermarket for these cars at all.

[@landocalriziosgaming8989]

@@RADPotential yeah I haven’t been able to find much I figured about the only way would be to find a parts car

[@davidtobler3936]

Looking for someone to work on my 1990 Rx7 gtu 13b not turbo in Peoria il. Just moved here can you help.

[@RADPotential]

Phalanx performance in STL

[@davidtobler3936]

@@RADPotential Thank you