picture of cb perf. drum brake dropped spindles for the 944 conversion

[Philippe]

I just found out that using these spindles for a 944 conversion probably isn't a great idea.

Some of the 944 conversion methods I have found use a drum brake spindle and a steel caliper adapter. If you want to use dropped spindles you need to use the disc version. The reason for this is that one of the mounting holes needed to mount the caliper adapter goes through the steering knuckle and the other hole is above it. I personally don't think it's safe to machine away any material on that knuckle/rib, and the second hole being above it poses more problems in designing your caliper adapter.

If you aren't using dropped spindles, stock drum brake spindles are the way to go (keith seume's book uses this method).

Just thought I'd share before anyone buys a set of these for the conversion. I almost did...

[GUTTERS]

I used stock drum brake spindle and then made the caliper adaptors out air craft grade alloy. plus i already had th spindles so it cost less which is a bonus.

[Philippe]

yeah that's what I'm saying... I wrongly assumed that I could use a cb performance dropped drum brake spindle to do the conversion in Keith Seume's book.

Only works with stock drum spindles.

[Sandeep]

Now that I've seen the picture, it may be possible to use a 993 Biturbo caliper and mount it leading rather than trailing and having to modify the crossover tube.

With this design, you could mount the caliper like the Franklin's design.

Just my 2c

Sandeep

[Philippe]

derr... you're right.

I think I might still use the disc spindles, so I can bolt the caliper straight to it, and eliminate the additional variable of a caliper adapter...

[Slopel]

Is this on a stock king linkpin drum spindle or a balljoint spindle?

[Panelfantastic]

Originally Posted by Sandeep

... it leading rather than trailing...

Just my 2c

Sandeep

Hey Sandeep, whats the whole deal with leading vs. trailing? Is there a performance difference or just design constraints on different cars?

[Sandeep]

Leading vs Trailing .... good question Not sure if one is better than the other

Sandeep

[flat]

Re: leading vs trailing.

It makes no difference at all. The caliper clamps the disk and creates a moment (torque). Torque= FORCE x DISTANCE. The FORCE is the clamping force of the caliper, and the DISTANCE is just the radius of the disk. Therefore position doesn't make a difference. Just make sure you can bleed the caliper when positioned.

I've considered mounting a caliper on the bottom, in order to lower the centre of gravity of a car. The problem is bleeding, but then I was considering making a caliper mount with two sets of 'ears'. One to position the caliper in the bottom position, and the second to move the caliper to the side for bleeding purposes. Maybe one day when I have more time...


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