Cable to Hydraulic

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Cable to Hydraulic

Postby Icedmunkie » Thu Aug 07, 2014 6:07 pm

As some of you know I am in the process of fitting an Mazda MX5 Engine and Box into my Firenza. I've come up against a little snag.. The viva box was cable and the Mazda is Hydraulic. Now the clutch pedal pulls rather that pushes which means that it won't work with the mazda box.

Anybody got any ideas round this?? I am trying to use the standard pedal stepup as the the mazda one looks like and absolute *Bleep* to get to fit
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Re: Cable to Hydraulic

Postby hbpeter » Thu Aug 07, 2014 6:20 pm

Can you fit the Mazda master cylinder backwards, and connect to the pedal via the cable???

Got any photos of the parts, would help come up with an eccentric solution.

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Re: Cable to Hydraulic

Postby droopsnoot » Thu Aug 07, 2014 6:31 pm

Could you either fit the master cylinder to the front bit of the pedal box (that is, where the brake lamp switch goes), or fit it in the engine bay but lower down, so you can do something like the pushrod from the pedal to the servo?
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Re: Cable to Hydraulic

Postby Icedmunkie » Thu Aug 07, 2014 6:58 pm

droopsnoot wrote:Could you either fit the master cylinder to the front bit of the pedal box (that is, where the brake lamp switch goes), or fit it in the engine bay but lower down, so you can do something like the pushrod from the pedal to the servo?


Clutch not Brake...
Peter... Ill get pictures, it might work.. just not sure ill have enough room, it all seem a little close to the steering column and I an not sure how I would fill it up yet..
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Re: Cable to Hydraulic

Postby chrismc » Thu Aug 07, 2014 8:25 pm

Hi Chris,

I had the same problem with the hydraulic clutch on the Rover gearbox. I ended up making this

Image

I attached a short rod to the pedal which goes through the bulkhead. It is connected to this contraption. As the pedal is depressed it pulls the rod which creates a pushing movement on the other side of the pivot through a rocker arm arrangement.

Image

It took a while to figure out but it works really well.

I measured the amount of movement at the pedal and also the amount of travel that the master cylinder required to be fully depressed. (I think we all know that feeling).

I then mocked up the rocker in cardboard to get the measurements I needed.

Image

The whole thing needs to be well attached to the bulkhead because of the forces involved.

As you can see I am not running the original servo (mine is in the boot) so I am not sure how you will get around that but the above method has worked for me.

If you need any parts machining up let me know :)

Hope this makes sense as it is difficult to explain. :roll: :lol:
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Re: Cable to Hydraulic

Postby Icedmunkie » Thu Aug 07, 2014 9:01 pm

That sir is a mighty fine idea... I could go remote servo I guess??
I thought of an kinked lever Ill draw a picture later.

I do need some machining possibly. ill be in touch...
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Re: Cable to Hydraulic

Postby chrismc » Thu Aug 07, 2014 9:09 pm

If you are keeping the dual circuit brakes you will need 2 remote servos which is expensive. I only have a single circuit system because I laugh in the face of danger.

To be quite honest you probably don't need a servo anyway. Just push harder :lol:
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Re: Cable to Hydraulic

Postby Icedmunkie » Thu Aug 07, 2014 10:35 pm

Why would I need two remote servos? never had to look into it tbh...
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Re: Cable to Hydraulic

Postby chrismc » Fri Aug 08, 2014 5:38 am

A dual circuit master cylinder has 2 outputs. To servo assist you would need a servo on each.

As far as I am aware there is no after market dual circuit remote servo.

Anybody know of one?
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Re: Cable to Hydraulic

Postby droopsnoot » Fri Aug 08, 2014 10:11 am

Icedmunkie wrote:
droopsnoot wrote:Could you either fit the master cylinder to the front bit of the pedal box (that is, where the brake lamp switch goes), or fit it in the engine bay but lower down, so you can do something like the pushrod from the pedal to the servo?


Clutch not Brake...


I know, I meant like the brake pedal pushes forward into the brake master cylinder, you could mount the clutch master at the same level and modify the clutch pedal to push into it, if there's room. Or turn it around and mount it on top of the pedal box facing towards your legs, in a similar way to the brake lamp switch. Wouldn't work if it has an integral reservoir of course.

chrismc wrote:As far as I am aware there is no after market dual circuit remote servo.

Anybody know of one?


I don't but there was something similar on the last edition of "Car SOS" last Sunday, where they used two servos mounted on the inner wing of whatever it was (Zephyr?) so that the chap could have assistance on the brakes and clutch as he had tendon trouble.
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