2-bolt M/C for 4 wheel manual disc conversion?
#1072129
09/09/11 02:24 PM
09/09/11 02:24 PM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
OP
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OP
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Joined: Jan 2003
Posts: 3,031
Erda, UT
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I finally figured out why I have so little rear brake... I'm using the m/c from a truck with manual disc/drum so the rears are not getting the needed volume.
What is the OEM application I should look for, bearing in mind I need the O-ring retaining groove?
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: 67Charger]
#1072131
09/09/11 02:55 PM
09/09/11 02:55 PM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
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...right, and that's the truck I'm using it from. None of those are 4 wheel disc. The rears are not getting the volume they need from a drum m/c.
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: 67Charger]
#1072132
09/09/11 03:06 PM
09/09/11 03:06 PM
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Joined: Mar 2007
Posts: 3,285 West Coast, USA
jbc426
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I wouold give Cass, a.k.a. Dr Diff a call, give him te specifics of your brake system and see what he says. He's a very knowlegable man.
I have two complete 4 wheel disc conversions, one power & one manual, using his recomended parts set-ups. Both are amazingly balanced, predictable and cost-effective.
1970 Plymouth 'Cuda #'s 440-6(block in storage)currently 493" 6 pack, Shaker, 5 speed Passon, 4.10's 1968 Plymouth Barracuda Convertible 408 Magnum EFI with 4 speed automatic overdrive, 3800 stall lock-up converter and 4.30's (closest thing to an automatic 5 speed going)
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: 67Charger]
#1072133
09/09/11 04:06 PM
09/09/11 04:06 PM
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Joined: Jan 2003
Posts: 25,899 Rio Linda, CA
John_Kunkel
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I'm curious why you think the rears aren't getting the needed volume? Is the pedal bottoming out?
Unless the MC bore is stepped, the needed volume will be supplied by a longer pedal stroke.
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: John_Kunkel]
#1072134
09/09/11 06:18 PM
09/09/11 06:18 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
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What John said, was wondering that myself as usually they have 2 much bias
live every 24 hour block of time like it's your last day on earth
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: savoy64]
#1072137
09/10/11 03:40 AM
09/10/11 03:40 AM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
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OP
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Joined: Jan 2003
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I have NO prop valves, either factory or aftermarket. The reason I don't think the back brakes are working is after 200 miles of road racing at 140 mph and probably 100 1/4 mile passes I can still see the factory grind pattern in the rear rotoer, whereas the front rotors are worn about .030" each and at about 80% pad life.
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: 67Charger]
#1072138
09/10/11 05:05 AM
09/10/11 05:05 AM
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Joined: Jan 2003
Posts: 27,471 So Cal
autoxcuda
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Quote:
I have NO prop valves, either factory or aftermarket. The reason I don't think the back brakes are working is after 200 miles of road racing at 140 mph and probably 100 1/4 mile passes I can still see the factory grind pattern in the rear rotoer, whereas the front rotors are worn about .030" each and at about 80% pad life.
Throwing this out...
Heavy car high center of gravity lot of front end weight (?60/40?)
What's the size of your front torsion bars. Could be transfering a lot of weight to the front too.
Have you four corner scaled your car?
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: AndyF]
#1072143
09/10/11 04:15 PM
09/10/11 04:15 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Quote:
Put a pressure gauge in both circuits and see what it says.
As double R would say ding ding ding I do believe we have a winna EDIT U can get a 2000 lb psi gauge for $15 (likely 1/4" NPT male) & the hardest part is the proper fittings 2 connect it
Last edited by RapidRobert; 09/10/11 04:18 PM.
live every 24 hour block of time like it's your last day on earth
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Re: 2-bolt M/C for 4 wheel manual disc conversion?
[Re: RapidRobert]
#1072144
09/11/11 01:18 PM
09/11/11 01:18 PM
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Joined: Jan 2003
Posts: 3,031 Erda, UT
67Charger
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OP
master
Joined: Jan 2003
Posts: 3,031
Erda, UT
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Thanks guys, and sorry for such a delay in replying. We've been in a 2 month thrash getting the second car ready for Silver State.
As I stated before, there are NO dividers, prop valves, adjustable whatevers, just m/c feeding lines. Front port to rear brake line, hits a tee on the rear axle and goes to the calipers. Rear port to flex line to line-lock to tee to front calipers. The systems NEVER meet.
Weight bias of the car is 54/46, T-bars were .925, now 1.12.
I will try to get gauges plumbed in and see what's going on up there.
11.33 @ 118.46 on motor 10.75 @ 125.35 w/ a little spray Now, high Speed Open Road Racing - Silver State Classic Challenge, Nevada Open Road Challenge, Big Bend Open Road Race Rocky Mountain Race Week 2020, 2022 2.0, Sick Week 2023
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