4 Spd Jerico w/ '99 Motor - Miata Turbo Forum - Boost cars, acquire cats.

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Old 09-11-2013, 09:07 PM   #1
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Default 4 Spd Jerico w/ '99 Motor

I searched for Jerico and didn't come up with any good threads. Trying to find info about bolt up aluminum bell housings. I know Quick Time makes one, but I don't want a heavy steel one.

Does anyone know where to get an aluminum bell housing that bolts up?

I'm not really interested in welding up an adapter plate.

Any help would be great and there has to be someone out there that makes them for road racers etc.

Thx.
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Old 09-11-2013, 09:11 PM   #2
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There's an adapter plate available for TII trans. TII bellhousing is aluminum. Voila.
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Old 09-11-2013, 09:14 PM   #3
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So the TII rear bellhousing is the same bolt pattern as the front of the Jerico 4 spd?
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Old 09-11-2013, 09:27 PM   #4
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Oh.

Sounded like you were just concerned with motor side. My bad.
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Old 09-11-2013, 09:33 PM   #5
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no worries. Thx for trying to help.
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Old 09-11-2013, 11:07 PM   #6
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I saw a steel one on Jegs or Summit but have never seen an aluminum one for BP to Jerico.
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Old 09-11-2013, 11:19 PM   #7
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Yeah I've seen that one by QuickTime, if I can't find something else this winter. Then I guess I'll have to go that route, but I prefer not to.
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Old 09-11-2013, 11:27 PM   #8
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they make them steel so that a fly wheel doesn't take your legs off at high rpm. I doubt your gonna save a **** ton of weight, thin steel vs thick aluminum. I would assume your making good power with and want the 4 speed for either drag or drift.
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Old 09-11-2013, 11:45 PM   #9
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I'm going to run a twin disc tilton 7.25 setup and only spinning to 7800ish rpm, so I'm not to worried about blowing up a flywhl. Power is handled, yes. The 4 spd is for my autox car to be honest and only going to use the first three gears since fourth is obviously 1:1

I just want to min the weight on the front half of the car, so that's why I'm after an aluminum bellhousing.
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Old 09-11-2013, 11:59 PM   #10
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I have had aluminum bellhousings that were SFI certified. You are going to have to accept the fact that you are likely to have something like that fabricated. It is not the end of the world.

I know that a member here, Turns101, had a Jerico behind an MZR motor. I have not seen one behind a BP motor.
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Old 09-12-2013, 12:12 AM   #11
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that is Jeff Abbott's Formula D car. All i can say is, is it worth all the headaches to save 3lbs?
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Old 09-12-2013, 10:40 AM   #12
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How much is the weight difference? Truthfully many parts can be made the same weight between steel and aluminum unless the required geometry to make the part fit requires more material than is required for the strength and stiffness of the part. And I like having feet, I think having feet is one of the best things ever, so I'd stick with the steel lakewood/quicktime bell housing. I think TNTTuba has a magnesium case jerico that is going to be going into his auto-x car over the winter. And I'm also considering one, with the 3.63 rear end the 1:1 gear would be completely tolerable on the highway.
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Old 09-12-2013, 02:42 PM   #13
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^Yeah that's my exact thoughts on the gearing to be honest.

Do you know the weight savings on the mag case vs. alum? Maybe with the mag case and steel BH it would be a wash, maybe?

I have heard that the mag case isn't as strong as the alum and could need replaced after a few year depending on use in the car. Thoughts?
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Old 09-12-2013, 02:45 PM   #14
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I haven't looked that hard to be honest, my car needs ABS, an NB subframe, power steering, more front downforce and control arms before I really need to add power. TNTtuba should know more, I think he picked his up hella cheap from a hobby stock guy or something like that with already more or less the correct ratios.
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Old 09-12-2013, 05:44 PM   #15
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In for transmission info.
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Old 09-13-2013, 03:33 PM   #16
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Quote:
Originally Posted by hrk View Post
In for transmission info.
domestic 4 speed with a plethora of options.

Basically you get the steel bellhousing meant for the old domestics and get one of their transmissions and add a custom clutch disc, throw out bearing and input shaft bearing to match the input shaft.

there are more options that fit that bell than just a jerico too. plenty of 4 speeds out there with hundreds of ratios and several different spline and length inputs with a few different shifter options depending on the use.

used they can go from $1,200 up for the transmission and you will have a 500hp capable transmission (on the low end) with straight cut gears and possibly dog engagement.
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Old 09-13-2013, 03:41 PM   #17
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Also the 5 speed TKO500 fits that bell housing.
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Old 09-13-2013, 04:25 PM   #18
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I wish I knew about this bello housing last year
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Old 09-13-2013, 07:50 PM   #19
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Quote:
Originally Posted by shlammed View Post

used they can go from $1,200 up for the transmission and you will have a 500hp capable transmission (on the low end) with straight cut gears and possibly dog engagement.
However, you will have around $3k invested into the project even buying a used tranny for $1200 and a whole heap of work.

Custom clutch set up
Factory hydraulic assist to deal with
Custom cross member
Custom driveshaft
Custom rear diff support
Custom shifter set up to relocate rearward depending on bellhousing depth

Did I miss anything?
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Old 09-13-2013, 07:57 PM   #20
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Custom clutch? I would just call up speedsport and tell them I need a new friction disk with a different spline.
It looks like it works with the factory hydros.
Crossmember? I'm making a PPF adapter, clamp on if need be.
~$150 at your local drive shaft shop to get your stocker cut down or lengthened and the front spline changed and rebalanced.
Diff support? See crossmember.
Custom shifter shouldnt be too hard. The Jerico and most T10/T101a variants are side loaders so they already uses a series of adjustable length linkages outside the trans to connect to the shifter. So at most its a few hours with the welder to move the spot the shifter connects to.
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