My 1988 LFX F40 build. (Page 51/68)
Daryl M SEP 02, 12:51 AM

quote
Originally posted by fieroguru:

You should post a picture of the clutch line connector portion on the transmission. There are at least 2 different types.



Guru, you are rright. You need more info, so hopefully these photos will fill in the blanks. The first is the fitting you were asking about on the transmission. The others are of the hydraulic line from the clutch master cylinder. The line is about 6 inches to short to reach the fitting on the transmission. Thanks for looking at this for me.
fieroguru SEP 02, 07:00 AM
The standard G6 F40 uses a different HTOB, clutch line connector, and bleeder assy which is what my clutch line connector is designed to work with. It allows the Fiero line to thread in on one side and has the quick disconnect fitting for the bleeder assy on the other.


The one you have might still use the same bleeder quick disconnect fitting (which might allow my fitting to work, but I haven't confirmed it), but it will need to connect higher and about 2-3" closer to the transmission. You can get the clutch line repair kit from Rodney: https://rodneydickman.com/a...eywords=clutch+line. With this, you can cut the old line in the proper location to make the clutch line several inches longer.

You likely could also use your AN to quick connect fitting, but you will still have to rework the Fiero clutch line to accept the AN hose fitting. Either method will likely work it really just depends on what parts you want to use.

[This message has been edited by fieroguru (edited 09-02-2020).]

Daryl M SEP 02, 11:05 AM

quote
Originally posted by fieroguru:

The standard G6 F40 uses a different HTOB, clutch line connector, and bleeder assy which is what my clutch line connector is designed to work with. It allows the Fiero line to thread in on one side and has the quick disconnect fitting for the bleeder assy on the other.


The one you have might still use the same bleeder quick disconnect fitting (which might allow my fitting to work, but I haven't confirmed it), but it will need to connect higher and about 2-3" closer to the transmission. You can get the clutch line repair kit from Rodney: https://rodneydickman.com/a...eywords=clutch+line. With this, you can cut the old line in the proper location to make the clutch line several inches longer.

You likely could also use your AN to quick connect fitting, but you will still have to rework the Fiero clutch line to accept the AN hose fitting. Either method will likely work it really just depends on what parts you want to use.




I'm thinking if I could find or have made an adapter piece 6 inches long, to connect the two pieces shown in the first photo below, my problem would be solved. The black composite piece, I think you called it the Bleeder, fits the fitting on the transmission. The other side of the black fitting fits as shown.
What do you think?
fieroguru SEP 02, 05:16 PM
That would work, but I will be a custom designed and machined piece. Female AN to Fiero clutch line is not going to be an off the shelf item.
Daryl M SEP 02, 08:06 PM

quote
Originally posted by fieroguru:

That would work, but I will be a custom designed and machined piece. Female AN to Fiero clutch line is not going to be an off the shelf item.


I think I have determined that the size of the AN fitting is a -4, but I am having difficulty determining the size and type for the Fiero fitting. Would you know?
Daryl M SEP 03, 04:47 PM
How much pressure is in the clutch hydrolic system when the pedal is depressed?
fieroguru SEP 04, 07:08 AM

quote
Originally posted by Daryl M:

How much pressure is in the clutch hydrolic system when the pedal is depressed?



Depends entirely on the clamp force of the pressure plate, the motion ratio of the pressure plate fingers, and the size (piston area) of the HTOB. The hydraulic clutch components that I have found with line pressure design specs recommend keeping it less than 50 bar = 725 psi. There are also videos of people checking their clutch line pressures and find them to be in the 100 to 300 psi range. I haven't ever measured mine but the pedal effort is definitely higher than stock 2.8 (stock 2.5 is super light pedal pressure).
Daryl M SEP 04, 07:12 PM

quote
Originally posted by fieroguru:


Depends entirely on the clamp force of the pressure plate, the motion ratio of the pressure plate fingers, and the size (piston area) of the HTOB. The hydraulic clutch components that I have found with line pressure design specs recommend keeping it less than 50 bar = 725 psi. There are also videos of people checking their clutch line pressures and find them to be in the 100 to 300 psi range. I haven't ever measured mine but the pedal effort is definitely higher than stock 2.8 (stock 2.5 is super light pedal pressure).



Since the pressure plate and HTOB is from a Saab, I would think the pressures would be similar to the Saab. I ordered a -4AN female fitting and hose rated at 1000psi. As soon as I determine the size and type of fitting the Fiero slave takes, I'll start sourcing that fitting so I can just make a short adapter.
msweldon SEP 04, 09:08 PM
Watching the adapter construction very closely as I'm one step behind you.
Daryl M SEP 04, 09:45 PM

quote
Originally posted by msweldon:

Watching the adapter construction very closely as I'm one step behind you.



I've been getting lots of help, both locally and from this forum. When I finish the adapter, I'll post what I decided on. Like most things, there many solutions that will probably work.