Flywheel Dimension 1.8 Chromoly
 

Wondering if anyone has a lightweight chromoly flywheel kicking around, such as the XTD for example?

I'm looking for one dimension... thickness from crankshaft flange (crankshaft side) to friction surface.

If your straight edge is too long to sit on the friction surface, crankshaft flange to pressure plate step face will also work, since the step is a known dimension.

If anyone's unsure what i mean let me know & i'll sketch out a nice cutaway view in MS paint.

Thanks in advance!

146 views and no one has a flywheel kicking around? I shall grace you with some MS Paint artwork.

https://www.miataturbo.net/attachmen...ine=1453395083

I have a stock 1.6 I can measure for you. I would assume they are the same?

Do you need the red line or green line measured? How accurate do you do need. I have a 1.8 light weight flywheel in my garage, but I have no clue of the brand or what it is made out of. I could possibly get some measurements tonight, but most likely would be tomorrow.

I can get it tonight too if needed.

Thanks for the replies guys! What i am trying to work out is if there is any difference between a lightweight steel miata flywheel and a stock FWD BP flywheel in this dimension. I am trying to reduce my clutch stack height by a few mm for various toyota transmission swap reasons.

aidandj - Unfortunately the 1.6 flywheel is different and will have different dimensions.

shuiend - Either the red or green line would work. The difference between them is the flywheel step, which is a known dimension (20.0mm). As far as accuracy, +/- 1mm or better would be ideal, if possible.

info on trans swap?

FWD car. No care.

Mine is a 1.8 lightweight flywheel.

Yes it's FWD for now but there's an AWD trans sitting in my garage ;). A few years ago when i did the conversion I had to clearance the bellhousing of the FWD trans to clear my clutch. I'd rather not have to do the same to the AWD trans.

The transmission i'm using is a Toyota E-Series, used in basically anything 3SGTE powered, plus some of their heavier V6 cars like the Camry and Solara 3.0 v6. The trans in the car now is from a 00 Camry, the trans in my garage is from an ST205 Celica GT4.

Sean, that's perfect, if you don't mind measuring it, I'd greatly appreciate it!

Edit: I hadn't thought about this before but... if there is a beefy RWD toyota transmission out there which bolts up to Toyota S-Series motors (3S, 5S, etc.), I will very shortly be selling BP adapter plates...

someone research this.

I think the fwd and rwd BP oil pan bolt patterns are slightly different, but i'm sure it's not insurmountable.

Anyone have a chance to measure a lightweight BP flywheel yet?

W58s and W56s are not at all bad transmissions in terms of strength or ratios.

I have been lazy, I am sorry. Maybe tomorrow night.

6 speed gear ratios:

1st 3.760
2nd 2.269
3rd 1.645
4th 1.257
5th 1.000
6th .843

W58 as found in Supra's and such....

First Gear: 3.285:1
Second Gear: 1.894:1
Third Gear: 1.275:1
Fourth Gear: 1.00:1
Fifth Gear: 0.783:1

A W58 would reduce the need for a 3.6 that many have in order to make 1st gear actually useful, its less aggressive overall. The splits between gears are pretty durn similar between it and a 6 speed though, which is the important thing?

Really neato; the NT Supra transmissions use a steel sandwich plate vs an alloy one and I guess this is a big deal. I bet the alloy one would be fine even for psycho-spec NAs and NBs. And the alloy plate ones are far cheaper according to the magic of wiki.

I have a fidanza flywheel I can measure tonight.

Concerning RWD trans adaptability, I'm unsure about the S series, but the 3VZ-FE is rumored to bolt to an R series trans, which is quite beefy indeed.
It's found in about every toyota/ jeep/ dodge truck or RWD car from the late 80s and 90s.
I have a bunch of W56/58s and a few R series laying around if you need some measurements.

Thanks guys. Oh yeah, I was actually looking into the whole RWD toyota transmission thing the other day, forgot to post about that....

Monk, if any of those W's or R's that you have lying around have a 3VZ bellhousing on them, and you're feeling kind enough to pull it off and loan it to me, I'd be happy to physically match it up against one of my adapter plates and see how well it might work.

The 3VZ should have (mostly) the same bolt pattern as the 1MZ and 3S. (My adapter plates work with the 1MZ and 3S 2WD/AWD e-series transmissions). The rotation of the engine in relation to the trans is what I'm unsure about as far as these plates working in a miata.

As a matter of fact I have a 3vze bellhousing for a r series.
Pm me your address.

Perfect! PM sent.

My machinist has an order for a batch of plates in hand as we speak, I'm expecting them roughly the middle of this month.

Cool, I have the flywheel at work.
I'm doing some training this morning, but I'll measure as soon as I get back.

Forgot my calipers at home yesterday, so still no flywheel measurements. Sorry!
I will get them when I get home today.
In the meantime, here is some good info about the W58 and R154, which are the 2WD versions.
There are many different versions of these trannies, and nearly all have interchangable parts among the series (W to W, R to R), most importantly, the input shafts.
These are the best candidates for us.

https://www.miataturbo.net/attachmen...ine=1454600151


W58 top, R154 bottom


https://www.miataturbo.net/attachmen...ine=1454600151


W58 top, R154 bottom


https://www.miataturbo.net/attachmen...ine=1454600151


W58 bottom, R154 top


https://www.miataturbo.net/attachmen...ine=1454600151


W58 pattern


https://www.miataturbo.net/attachmen...ine=1454600151


R154 pattern

https://www.miataturbo.net/attachmen...ine=1454600413


W58 width @ sandwich plate ~8.5"


https://www.miataturbo.net/attachmen...ine=1454600413


R154 width @ sandwich plate ~9.5"


https://www.miataturbo.net/attachmen...ine=1454600413


W58 overall length (from bellhousing mounting face) ~22.25"


https://www.miataturbo.net/attachmen...ine=1454600413


R154 overall length (from bellhousing mounting face) ~22.25"

https://www.miataturbo.net/attachmen...ine=1454600974


W58 input shaft length ~6.0", R154 input shaft length ~6.75"

https://www.miataturbo.net/attachmen...ine=1454600974



W58 top, R154 bottom


https://www.miataturbo.net/attachmen...ine=1454600974


(left side) W58 left, R154 right

Excellent info, thank you! If someone could compare Monk's dimensions to an NA/NB transmission to confirm the viability of this idea, that would be immensely helpful. Looking forward to test fitting one of my plates on the R bellhousing!

Do you already have a plate made?
If so, I have a BP and each kind of tranny already pulled.

Edit: Derp, just reread your last post. Proceding as planned...

Um. This excites me

The only plate i have right now is installed in my car at the moment.

I do however have a BP short block in my basement. So once i get the plates in it'll be pretty easy to set the deck level, bolt up the plate & bellhousing, and see how everything lines up. I assume the BP is in fact level side-to-side when installed in a miata?

BP is level side to side.

NA/NB transmissions are the same.

This also excites me. Arent r154s good for like 600wtq or something.

Wow, those trans would hang down like below the block. Can you get a measurement from input shaft to the bottom of the trans?

Also they would need some serious shifter moving. Like 10"

Yes, the r154 is bulletproof.
Even the W 58 has been rumored to handle up to 450 horsepower, but I would say 250 is more reasonable.

I will see what I can do about that measurement.
The front to back measurements in that picture are from where the bell housing meets the body.
I would actually expect the lengths to be very similar.
I will be able to tell you for sure in about an hour.

Also, I don't know that the W Series trans were ever put behind a v6, but it did go behind a 7mge and 22R.
I have both bellhousings if you would like those as well.

I'm fairly certain the 7m and 22r have totally different bellhousing patterns with no chance of bolting to my plate, so no need to send those.

My 6 speed measures 24 and a half inches from the bell housing face, and 33 3/4 overall.

I put a T5, miata 6speed, and a W56 side by side, and the differences are pretty striking.
My phone is too much of a potato for low light pictures, so I'll post some in the morning.
If a T5 fits in the tunnel, I would think a Toyota trans will fit just fine. The T5 is 9 1/2" at its widest point.
More measurements to come, but it looks like the Miata tranny and the R154 are pretty damn close to the same length.

I should have realized this based on the length of the input shaft, but I confirmed the 3vz bellhousing is 6.75" deep, making the overall r154 length 29".
That's about 5" shorter than the Miata box :sad2:
I'm not sure how you would make an extension for this box.

So, i googled, "R154 shifter extension" and there appear to be several options, here's one of them:

R154 Shifter Extension for MK4/SC300

I finally got what you originally asked for.
Hopefully you can tell by my shitty drawing, but the distance from crank to friction plate is 33mm, and 16.5 from the crank to the bolt flange?
Whatever the hell you call the flat part where the bolts go through.

https://www.miataturbo.net/attachmen...ine=1454845177


https://www.miataturbo.net/attachmen...ine=1454845177

Crankshaft side for posterity.

https://www.miataturbo.net/attachmen...ine=1454845436

Thank you! The drawing and measurements make sense.

What i'm not sure about is... what clutch is that flywheel intended for? It looks very small in diameter like maybe a twin disc racing clutch?

Yes, twin disk clutch.

Specifically this one:

https://www.miataturbo.net/attachmen...ine=1454939097

It will work with most 7 1/4" clutches though.