Do u know were TDC is?
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From: Tampa Bay Florida
Do u know were TDC is?
Top Dead Center, something we all take for granted: kind of like air; you dont realize how important it is until you are not getting any. Wait, was air or was it sex instead? .... Well ... Anyways, before I get a reply telling to use the forum search. We all know that TDC would be afew degres before the yellow mark on the pulley( depending on you engine year, the red ATDC mark, 10deg 15deg so on). We have learn to trust those pulley marks so much. Lets just say that in this case, the pulley does not belong to this particular engine. Ignition timing on our rotaries make a life or death difference of an engine.
So heres the dilemma, I just rebuilded and ported and 89 engine and transplanted it on a 87 body. The front main pulley on the 89 did not work with the rest of the pulleys onthe 89 eng, so u see were im going and were im at. Front rotor cover housing differ in many aspects, so I believe the markings are not the same. therefore the pulley markings are off.
Now in a piston engine to find TDC all you do is take #1 spark out rotate crankshaft until the piston(by feeling it with a ie pencil)is on the very top and the intake valve just finish closing. voila theres TDC and no need to take the whole engine out.
My theory is that on a rotary u would have to remove the trailing and leading rear rotor plugs, feel the same apex seal as it crosses the plugs hole,find the halfway point and then your front rotor; in theory shoud be @ TDC.
I would appeciate any inputs especially if your name is Felix Wankel....
So heres the dilemma, I just rebuilded and ported and 89 engine and transplanted it on a 87 body. The front main pulley on the 89 did not work with the rest of the pulleys onthe 89 eng, so u see were im going and were im at. Front rotor cover housing differ in many aspects, so I believe the markings are not the same. therefore the pulley markings are off.
Now in a piston engine to find TDC all you do is take #1 spark out rotate crankshaft until the piston(by feeling it with a ie pencil)is on the very top and the intake valve just finish closing. voila theres TDC and no need to take the whole engine out.
My theory is that on a rotary u would have to remove the trailing and leading rear rotor plugs, feel the same apex seal as it crosses the plugs hole,find the halfway point and then your front rotor; in theory shoud be @ TDC.
I would appeciate any inputs especially if your name is Felix Wankel....
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From: Coldspring TX
You ansewered your own question- put an apex seal of the rear rotor between the leading & trailing plug holes, and mark your pulley at that point- that's your leading mark...Damn close, anyway...
And even though you said not to, I'm still gonna tell you to search- there's at least 5 threads on this particular topic that I've read in the last couple of months
And even though you said not to, I'm still gonna tell you to search- there's at least 5 threads on this particular topic that I've read in the last couple of months
Originally Posted by Rotarius
Top Dead Center, something we all take for granted: kind of like air; you dont realize how important it is until you are not getting any. Wait, was air or was it sex instead? .... Well ... Anyways, before I get a reply telling to use the forum search. We all know that TDC would be afew degres before the yellow mark on the pulley( depending on you engine year, the red ATDC mark, 10deg 15deg so on). We have learn to trust those pulley marks so much. Lets just say that in this case, the pulley does not belong to this particular engine. Ignition timing on our rotaries make a life or death difference of an engine.
So heres the dilemma, I just rebuilded and ported and 89 engine and transplanted it on a 87 body. The front main pulley on the 89 did not work with the rest of the pulleys onthe 89 eng, so u see were im going and were im at. Front rotor cover housing differ in many aspects, so I believe the markings are not the same. therefore the pulley markings are off.
Now in a piston engine to find TDC all you do is take #1 spark out rotate crankshaft until the piston(by feeling it with a ie pencil)is on the very top and the intake valve just finish closing. voila theres TDC and no need to take the whole engine out.
My theory is that on a rotary u would have to remove the trailing and leading rear rotor plugs, feel the same apex seal as it crosses the plugs hole,find the halfway point and then your front rotor; in theory shoud be @ TDC.
I would appeciate any inputs especially if your name is Felix Wankel....
So heres the dilemma, I just rebuilded and ported and 89 engine and transplanted it on a 87 body. The front main pulley on the 89 did not work with the rest of the pulleys onthe 89 eng, so u see were im going and were im at. Front rotor cover housing differ in many aspects, so I believe the markings are not the same. therefore the pulley markings are off.
Now in a piston engine to find TDC all you do is take #1 spark out rotate crankshaft until the piston(by feeling it with a ie pencil)is on the very top and the intake valve just finish closing. voila theres TDC and no need to take the whole engine out.
My theory is that on a rotary u would have to remove the trailing and leading rear rotor plugs, feel the same apex seal as it crosses the plugs hole,find the halfway point and then your front rotor; in theory shoud be @ TDC.
I would appeciate any inputs especially if your name is Felix Wankel....
I had teh SAME exact issue!
I removed the pulley\hub, in order to see the hub key. Once I had acces to the key on the hub; I marked it on the outside of the hub so that I could see it (the mark) while the hub was back on.
When the key(or new mark you just made) is at the 9'0 clock position, the front rotor is at TDC; this will also tell you if you are using the right hub to pulley combo
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From: Boston, MA
When the key(or new mark you just made) is at the 9'0 clock position, the front rotor is at TDC; this will also tell you if you are using the right hub to pulley combo
Pull the front pulley off and put the keyway to the twelve o'clock position. There, is where it is.
hugues-
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From: Tampa Bay Florida
I think the original rotaries had their trailing and leading plugs positioned evenly equidistance to the center of the rotor face. If im not mistaken Mazda positioned both plugs farther down to help combustion. That my friends throws that theory to the daawwwgsss. Any ideas ...
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From: Parts Unknown
Originally Posted by Rotarius
The front main pulley on the 89 did not work with the rest of the pulleys onthe 89 eng . . .
...I would appeciate any inputs especially if your name is Felix Wankel....
...I would appeciate any inputs especially if your name is Felix Wankel....
What exactly are you running?
Block:
Front Cover:
Front Pully:
You also stated the 89 pully would not work with the other pullies - cant happen, did you mean with the s4 accessories?
While your at it I see the next questions coming so which counter weight and flywheel are you using?
HAILERS
Joined: May 2001
Posts: 20,563
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From: FORT WORTH, TEXAS,USA
Originally Posted by hugues
Hmmm, conflicting answers. I hate that.
hugues-
hugues-
The bottom of this url tells how to find top dead center. I think it's a little sloppy myself. http://www.teamfc3s.org/info/articles/demystifying.html
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From: Tampa Bay Florida
BINGO, tx HAILERS 4 demystiying this riddle.
mr Gadget
Felix is dead, has been pushing up daisy's for a long time.
Oh *****!! NO way dude... I just sended a birthday car to Germany for his 102nd b-day.
HaHaHa
tranquilo, tx ur funny
mr Gadget
Felix is dead, has been pushing up daisy's for a long time.
Oh *****!! NO way dude... I just sended a birthday car to Germany for his 102nd b-day.
HaHaHa
tranquilo, tx ur funny
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
Look at this jpg. The view is LOOKING FORWARD. I marked where the yellow and red marks are. YOu can see the keyway. http://www.teamfc3s.org/forum/showth...threadid=33787
So I kinda scewed the pooch when I said the keyway is straight up at top dead center. It's really at ninty degrees. Look carefully at your pulley. The marks are very faint on some older pulley.
So I kinda scewed the pooch when I said the keyway is straight up at top dead center. It's really at ninty degrees. Look carefully at your pulley. The marks are very faint on some older pulley.
Last edited by HAILERS; Sep 2, 2004 at 01:00 PM.
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From: Tampa Bay Florida
Originally Posted by Mr. Gadget
Felix is dead, has been pushing up daisy's for a long time.
What exactly are you running?
Block:
Front Cover:
Front Pully:
You also stated the 89 pully would not work with the other pullies - cant happen, did you mean with the s4 accessories?
While your at it I see the next questions coming so which counter weight and flywheel are you using?
What exactly are you running?
Block:
Front Cover:
Front Pully:
You also stated the 89 pully would not work with the other pullies - cant happen, did you mean with the s4 accessories?
While your at it I see the next questions coming so which counter weight and flywheel are you using?
89 13B, 89 FrCvr(cant mix),87 fr ply. Exactly 89 pully does not lign up with s4 waterpump ect.---- S5 counter weights ofcourse(89 block)
The electric metering pump fudges everything up..but I want to be 100% sure were the timing is. Especially when the engine is so eager to rev pass the redline because of the street port.
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From: Tampa Bay Florida
Originally Posted by HAILERS
Look at this jpg. The view is LOOKING FORWARD. I marked where the yellow and red marks are. YOu can see the keyway. http://www.teamfc3s.org/forum/showth...threadid=33787
So I kinda scewed the pooch when I said the keyway is straight up at top dead center. It's really at ninty degrees. Look carefully at your pulley. The marks are very faint on some older pulley.
So I kinda scewed the pooch when I said the keyway is straight up at top dead center. It's really at ninty degrees. Look carefully at your pulley. The marks are very faint on some older pulley.
I see what ur saying. front cover housins s4 & s5 have the pin to align those pulley notches ondifferent areas. I believe the later is not on top but on the side almost so the notches on my pully mean nothing. the url explains how they found TDC without the help of the pulley and the woodruf key onthe escentric shaft may not be to accurate because of the rotating factor between the rotor and the e shaft. thats why i preffer to use the other method even thought if seems like is not carved on stone.tx
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