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Unread 07-02-2013, 12:38 PM   #21
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Originally Posted by Mr Car Guy View Post
Did you do anything about the coolant in the exhaust smell?

The rotor housing often warp on rotary engines resulting in coolant into the combustion chambers or combustion gas in the cooling system.

Other symptoms are very hard starting, boiling over/overheating.
I have not done anything about that yet. Once I get the car back running though it is on the list of things to check and/or fix.

It could be a rebuilt engine for all I know and the person who rebuilt it may have not put silicone sealant in the proper places when mating the irons.

Think I am going to make a trip to some local pull-a-parts and see if they have any FC's or FD's with TII 13b's in them or just an N/A 13b would be nice. Something to break down and tinker on when I am waiting on parts and in the future swap in for more power.
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Unread 07-02-2013, 10:59 PM   #22
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Carb going back together tomorrow. Moroso fuse panel comes in as well.
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Unread 07-03-2013, 12:34 AM   #23
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How does ignition work on these?
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Unread 07-03-2013, 05:29 AM   #24
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Man a LS under the hood would be s much easier.
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Unread 07-03-2013, 08:08 AM   #25
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Quote:
Originally Posted by Mike View Post
How does ignition work on these?
You mean in a rotary?

Well, in a 2-rotor wankel you have 5 pieces to the block. Rear housing, rear rotor housing, intermediary housing, front rotor housing, and front housing. They have coolant jackets running along the outsides. They bolt together in a horizontal fashion to form two chambers that the rotors rotate in. The rotors themselves seal inside the chambers through use of spring loaded metal seal (apex seal and side seals). When you hear someone is rebuilding a rotary they are typically replacing the seals as they are the first things to go when an engine blows unless something atypical happens. The rotors have dimples on each face to provide combustion area when the fuel/air gets compressed before combustion. Both rotors are linked by the eccentric shaft and have gearing inside to dictate how they rotate inside the rotor housing. The engine goes through intake, compression, combustion then exhaust and uses two spark plugs per rotor (I've also seen people who have added a third spark plug above the trailing plug (the top one) though I don't know why).

This video explains it better:


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Man a LS under the hood would be s much easier.
Ha. Have to swap in a new tranny and probably rear end as well as fab up custom motor mounts and install all the new electrical. It would be a lot more work.
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Unread 07-03-2013, 11:56 AM   #26
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I know how a rotary works, I was asking how the ignition works. I'm assuming it's not a standard distributor setup..
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Unread 07-03-2013, 12:15 PM   #27
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Quote:
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I know how a rotary works, I was asking how the ignition works. I'm assuming it's not a standard distributor setup..
I'm not sure how a standard dizzy is setup but I guess it is pretty standard. Basically like a 2 cylinder with 4 plugs.
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Unread 07-03-2013, 04:24 PM   #28
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Think I am going to make a trip to some local pull-a-parts and see if they have any FC's or FD's with TII 13b's in them or just an N/A 13b would be nice. Something to break down and tinker on when I am waiting on parts and in the future swap in for more power.
I wish you the best of luck. The only RX7 I've ever seen in person was in my local pull-a-part, but it's been gone for a couple years now and there's been no hint or trace of another one showing up anytime soon.

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I know how a rotary works, I was asking how the ignition works. I'm assuming it's not a standard distributor setup..
It is. They just drive it directly off the crank, and with different ratios since it has to fire three times per chamber for each revolution of the crank.
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Unread 07-03-2013, 06:21 PM   #29
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The 12A & 13B have a dizzy just like any other engine. The earlier engines had 2 dizzys, one called leading, one called trailing. Also 2 coils are used.


The combustion chamber is peanut shaped and they use 2 plugs for each rotor, one for each end of the peanut. This promotes more complete combustion and lower emissions. The leading plug fires first followed by the trailing. With the dual distributor engine each dizzy gets timed separately. On the later engine with one dizzy the leading and trailing are already configured in the one unit.


The latest generation of rotary engines still use 2 plugs per rotor but the ignition is crank fired.
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Unread 07-03-2013, 10:49 PM   #30
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Quote:
Originally Posted by Mr Car Guy View Post
The 12A & 13B have a dizzy just like any other engine. The earlier engines had 2 dizzys, one called leading, one called trailing. Also 2 coils are used.


The combustion chamber is peanut shaped and they use 2 plugs for each rotor, one for each end of the peanut. This promotes more complete combustion and lower emissions. The leading plug fires first followed by the trailing. With the dual distributor engine each dizzy gets timed separately. On the later engine with one dizzy the leading and trailing are already configured in the one unit.


The latest generation of rotary engines still use 2 plugs per rotor but the ignition is crank fired.
Such silly engines, lol
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