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TR8 brake aclipers on a Spridget

Whitephrog

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Anyone know whether or not TR8 brake calipers will work on a Spridget?
 
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Never heard of that. What makes you suspect they might?
 

JPSmit

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Looks like yes! Moss lists the same part number for both. Not sure how you found that out but...
 
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Whitephrog

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My son has a spare set from one of his TR8 projects. Looks like the MGB calipers sometime used on Spridgets.
 

JPSmit

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Looks like yes! Moss lists the same part number for both. Not sure how you found that out but...

OK, let's try that again. :blush: The pads are the same - the calipers themselves (according to Moss) are different which isn't to say that they wouldn't bolt on, but, it doesn't appear to be a straight swap.

Sorry about that, my eyes read caliper and my brain heard pads. doh!
 
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My stock caliper will lock the wheels just fine, no need for "better".
 

BlueMax

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Here are some questions?


The amount of braking force that is available is dependent upon a few things:
Tire traction
Brake disc sizes
Pad coefficient of friction
Caliper clamping force
Weight shift
Front/rear braking bias

If you locking you front brakes you鈥檙e actually losing traction for the controllability of the car. So you try to avoid that as much as possible.


Brake fade is your number one adversary that you鈥檙e trying to overcome. Brake fade is due to over heating brake fluid and friction material.

However before you go to the extent of installing larger brakes, you need to determine what enhancements to the car to justify the larger brakes.


You can use the MGB calipers with the 9" Spitfire rotors, but you will need an adapter to do so.
 
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Just to clarify what BlueMax is saying. You want to be able to modulate your brakes. If they are on/off like a switch you can quickly end up missing your turn in. Conversely, you certainly do not want the backs locking up before the fronts or you will have the car swap ends and go off a curve backwards and down the embankment. The rolling rear tires keep the car tracking forward.
 

Gerard

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Here are some questions?

You can use the MGB calipers with the 9" Spitfire rotors, but you will need an adapter to do so.


The MGB/Spitfire conversion is the worst fitting disc brake upgrade I have ever done. For someone that wants to do a disc brake upgrade that's a straight forward install, I think the one from Steve Christiansen is the one to consider.
 

BlueMax

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I chose to build mine myself; had no fitting issues since I machine everything to my specifications. But, I would say not for those with moderate mechanical or machining skills.

P1030871.jpg
 

Gerard

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I chose to build mine myself; had no fitting issues since I machine everything to my specifications. But, I would say not for those with moderate mechanical or machining skills.

View attachment 36170


My point is, it's not a bolt on kit, even though it's promoted as such. It takes a lot of fiddle-f*cking" with it to get it to fit/work right. As a "kit" it comes very incomplete. For what it costs to buy, I think it's a very poor value, and didn't find the improvement to be that significant compared to others I have installed that were much better engineered for around the same money. That combo is a very old school combination that I believe was developed originally by Joe Huffaker when there weren't any other options. It makes little sense to use on a street car today when there are better options.
 

aeronca65t

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Honestly, I've been racing on the stock setup for years. It really hasn't been an issue.

In fact, I found some of the racing pads are a bit too hard (at least for vintage racing, where we have fairly moderate engines and tire sizes).

So I just run whatever "street/performance" pad I can find (like the upgraded street pads from Moss). I've always run stock rear linings too.

I usually get 3 or 4 weekends out of the pads and at least a season (8 or 9 events) out of the stock rotors.
 

JPSmit

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Honestly, I've been racing on the stock setup for years. It really hasn't been an issue.

In fact, I found some of the racing pads are a bit too hard (at least for vintage racing, where we have fairly moderate engines and tire sizes).

So I just run whatever "street/performance" pad I can find (like the upgraded street pads from Moss). I've always run stock rear linings too.

I usually get 3 or 4 weekends out of the pads and at least a season (8 or 9 events) out of the stock rotors.

I think the decision was already made to not go with the TR7 calipers a number of posts ago - though the rest of the info is very valuable. :cheers:
 

nomad

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Gerard, not planning on redoing my brakes but am curious as to who Steve Christiansen is and what his brake kit consist's of?

Kurt.
 
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You'll note that he is using a Marina hub. I guess these are available as repros? Or he is sourcing good s/h units.
 
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I just checked the web. Marina hubs have different bolt pattern, so I assume he is sourcing the hubs manufactured for the Morris brake conversions.
 

Gerard

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Gerard, not planning on redoing my brakes but am curious as to who Steve Christiansen is and what his brake kit consist's of?

Kurt.

He makes a variety of aftermarket parts for a variety of cars, including rear disc brakes setups. Here's the Midget page.

https://www.olphartz.com/midget.html

I looked into his machinist making my 5 speed kits. The guy is quite skilled and makes some very high end parts for some exclusive customers.
 
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