bellhousing/input shaft measurement needed plz
04-19-10, 08:08 PM
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bellhousing/input shaft measurement needed plz
hey guysssss. Can someone with an s4-s5 tranny laying around measure the distance between the end of the bellhousing and the end of the input shaft? basically I need to know how far recessed the input shaft is into the bellhousing. If the input shaft sticks out, I need to know by how far.
I think TII and NA transmissions are the same in this respect, not for sure though.
I need this measurement because I'm swapping a 13b into a miata and I'm trying to use a miata tailshaft->miata gearbox->13b bellhousing. I don't know if I'll have to lengthen or shorten the 13b bellhousing until the motor has the clutch installed, so I just want to make sure it adds up on paper. thanks.
I think TII and NA transmissions are the same in this respect, not for sure though.
I need this measurement because I'm swapping a 13b into a miata and I'm trying to use a miata tailshaft->miata gearbox->13b bellhousing. I don't know if I'll have to lengthen or shorten the 13b bellhousing until the motor has the clutch installed, so I just want to make sure it adds up on paper. thanks.
04-19-10, 09:54 PM
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you will have to modify(shorten the input shaft)
see the following
http://www.mazdatrix.com/faq/miatainputshaft.htm
see the following
http://www.mazdatrix.com/faq/miatainputshaft.htm
04-19-10, 10:09 PM
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thanks for the info, but I'm well aware of that. That unfortunately is not directly applicable, because it is about miata gears in an rx7 gearbox.
Since I obviously have to custom make engine mounts, my strategy was to make a spacer between the gearbox and bellhousing and just place the engine roughly 3/8" forward to accomodate for the longer input shaft. This would be easier in the long run because I wouldn't have to disassemble my transmission if I broke it and needed to swap it. However, I don't know if the spacer is necessary, because the miata gearbox is shaped differently than an rx7 one, and for all I know could be 3/8" longer than an rx7 one.
So, I want to see how far off I am, if I have the input shaft/bell housing rx7 measurement, I can compare it to what kind of clearance I get when I bolt an rx7 bellhousing straight to a miata gearbox. (I unfortunately only have a miata transmission and an rx7 bellhousing at my disposal)
edit: My rough measurements with a tape measure indicate that the rx7 bellhousing is indeed roughly 3/8" shorter than a miata bellhousing, but that is irrelevant. What's important is where the input shaft sits relative to the edge of the bellhousing.
Since I obviously have to custom make engine mounts, my strategy was to make a spacer between the gearbox and bellhousing and just place the engine roughly 3/8" forward to accomodate for the longer input shaft. This would be easier in the long run because I wouldn't have to disassemble my transmission if I broke it and needed to swap it. However, I don't know if the spacer is necessary, because the miata gearbox is shaped differently than an rx7 one, and for all I know could be 3/8" longer than an rx7 one.
So, I want to see how far off I am, if I have the input shaft/bell housing rx7 measurement, I can compare it to what kind of clearance I get when I bolt an rx7 bellhousing straight to a miata gearbox. (I unfortunately only have a miata transmission and an rx7 bellhousing at my disposal)
edit: My rough measurements with a tape measure indicate that the rx7 bellhousing is indeed roughly 3/8" shorter than a miata bellhousing, but that is irrelevant. What's important is where the input shaft sits relative to the edge of the bellhousing.
Last edited by N3v; 04-19-10 at 10:17 PM.
