Are all flex plates/Counter weights the same?
06-01-2006, 01:08 AM
#1
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Join Date: Jan 2006
Location: Kirkland WA 98034
Posts: 153
I have an auto 88 gxl. i did an engine swap. I used my Flex plate and counter weight from my other engine!! are these two parts balanced for the engine that they were Originaly on? or are they all the same.. i cant seem to get an answer from anyone. not even the dealership. Im sure someone has to know this.. i cant call mr wankel he died. maybe the secrets safe with him eh... 
06-01-2006, 02:20 AM
#3
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Join Date: Dec 2005
Posts: 75
there are factors that modify this. Such as- is it an s4 engine with an s4 counterweight? or an s4 counterweight on an s5 engine? Was the counterweight originally from an automatic car and now on a manual, vice versa? From what i understand the counterweights from an auto and from a manual are different, same with the weights from an s4 and an s5. Therefore, an s4 counterweight will not work with an s5 motor-vise versa, and an automatic counterweight/flywheel will not work with a manual car- vise versa. Hope this helped a little bit.
06-01-2006, 02:25 AM
#4
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Join Date: Feb 2005
Posts: 519
check motor mounts, tire pressure, balance, timing, transmission mounts, bellhousing bolts,etc. From what I can tell on Mazdatrix site the 86-88 flexplates and counterweights are interchangeable. So as long as the flexplate and counterweight you used was from an 86-88 engine than you are fine. If that is the case then you need to check out what I mentioned to find the source of vibration.
06-01-2006, 02:41 AM
#5
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Join Date: May 2005
Location: central WA state
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the donor engine was an 88 gxl auto, and the receiving car was an 88gxl auto. it would seem that it wouldn't be a problem, cept for the 3mm apex seal na rotors in the donor engine and the d shaped exhaust ports- could it have been a frankenmotor? (hayes rebuild from a few years back). I'll get you the flex plate and counterweight from the donor car. pm me your address, I'll ups them (it really is cheaper that the 165 mile round trip up there!)
if you need the big wrench, let me know and i will send it too.
jdh
ps- did i leave those vids in your garage? cant seem to find them in the van (lol)
if you need the big wrench, let me know and i will send it too.
jdh
ps- did i leave those vids in your garage? cant seem to find them in the van (lol)
06-01-2006, 03:02 AM
#6
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Join Date: Dec 2005
Posts: 75
Originally Posted by jenkin' post='822022' date='Jun 1 2006, 03:41 AM
the donor engine was an 88 gxl auto, and the receiving car was an 88gxl auto. it would seem that it wouldn't be a problem, cept for the 3mm apex seal na rotors in the donor engine and the d shaped exhaust ports- could it have been a frankenmotor? (hayes rebuild from a few years back). I'll get you the flex plate and counterweight from the donor car. pm me your address, I'll ups them (it really is cheaper that the 165 mile round trip up there!)
if you need the big wrench, let me know and i will send it too.
jdh
ps- did i leave those vids in your garage? cant seem to find them in the van (lol)
From what i understand, you need to use the same counterweight as the rotors you used. So if you used s5 rotors youll need an s5 counterweight, if im correct. Any one here to confirm please?
06-01-2006, 04:33 AM
#7
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Join Date: May 2005
Location: central WA state
Posts: 446
yeah, that is what everybody says, all the rotating parts ( minus eshaft)
need to be same series. front counter weight/rotors/rear counterweight or fwheel need to be from the same series. the problem in this case is that the engine (s4) had some unusual features, like 3mm apex seals (but that was explained away as the rebuilder did that with all of their rebuilds) and the exhaust ports were sort of an unusual D shape- which i have been told was a jdm thing. The engine came to me not running, but with the "it did run before the fire" story, and only 3-4K miles before it got parked. The teardown pretty much showed that level of use, and it was reassembled with the same parts. (+ 1 new apex seal because i think i chipped one when i was turning the motor by hand with my 3/4 drive set- got bad carbon lock to the point that we had to tear it down to get the rotors to turn)
anyway, it was reassembled and went into the donor car without the original flexplate/counterweight. and everybody says it should not make a difference, but we will see.
need to be same series. front counter weight/rotors/rear counterweight or fwheel need to be from the same series. the problem in this case is that the engine (s4) had some unusual features, like 3mm apex seals (but that was explained away as the rebuilder did that with all of their rebuilds) and the exhaust ports were sort of an unusual D shape- which i have been told was a jdm thing. The engine came to me not running, but with the "it did run before the fire" story, and only 3-4K miles before it got parked. The teardown pretty much showed that level of use, and it was reassembled with the same parts. (+ 1 new apex seal because i think i chipped one when i was turning the motor by hand with my 3/4 drive set- got bad carbon lock to the point that we had to tear it down to get the rotors to turn)
anyway, it was reassembled and went into the donor car without the original flexplate/counterweight. and everybody says it should not make a difference, but we will see.
06-01-2006, 12:43 PM
#8
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Join Date: Jan 2006
Location: Kirkland WA 98034
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ok so i could be running s5 parts then.. even s5 rotors? well that might explain things. Ok thanks everyone,
John i looked in the garage up and down. i dont see the video's either. however there is alot of stuff in here.. If i come across them i will let you know. Im going to message you my address.
John i looked in the garage up and down. i dont see the video's either. however there is alot of stuff in here.. If i come across them i will let you know. Im going to message you my address.
06-01-2006, 08:30 PM
#10
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Join Date: Jan 2006
Location: Kirkland WA 98034
Posts: 153
Im so confused. I talked to the guy that built my engine. he said it has s4 rotors. and he is sure that they are the same weight. and i put my s4 counter weight on. I cant keep pulling my engine putting it back in. to pull it agian and put it back in till i fix the problem. because im going to Burn out. I just recovered from putting it back in... anyone else have any ideas