Re: Master Cylinder PSI

Jim Bollman

I believe the Crosley master cylinder is a 1” bore.

Jim..

On Jul 28, 2020, at 9:56 AM, Bruce Derenski via groups.io <bruce.derenski@...> wrote:

The calculation of system pressure sounds about right. Rough eyeballing of the pedal leverage is about 5:1. Figure your brake foot applies about 50 lbs of force; you’d be getting 250 lbs of force coming into the master cylinder. Divide by the area of the master cylinder piston (sorry; I don’t know the bore size). If it’s a 1.5” bore (just a guess) that would be 1.8 square inches. 250/1.8= 141 psi.

On Jul 27, 2020, at 8:36 PM, Jim Bollman <Jim@...> wrote:

﻿Thanks Butch, I knew that, just forgot.

Jim...

On Jul 27, 2020, at 8:31 PM, Butch via groups.io <butch46988@...> wrote:

Jim,

While the original rears were 7/8", all of the replacements, for many years have been 3/4", as far as I know.
I do know, that all of the ones that we sol, were 3/4".

Butch

On 7/27/2020 8:12 PM, Jim Bollman wrote:
If you are working with new wheel cylinders did you put the right size in?

Wheel Cyl - 1??? front 7/8??? rear

If they are not new/rebuilt that would be a good place to start looking, could be a stuck cylinder.

Jim...

Re: Master Cylinder PSI

Bruce Derenski

The calculation of system pressure sounds about right. Rough eyeballing of the pedal leverage is about 5:1. Figure your brake foot applies about 50 lbs of force; you’d be getting 250 lbs of force coming into the master cylinder. Divide by the area of the master cylinder piston (sorry; I don’t know the bore size). If it’s a 1.5” bore (just a guess) that would be 1.8 square inches. 250/1.8= 141 psi.

On Jul 27, 2020, at 8:36 PM, Jim Bollman <Jim@...> wrote:

﻿Thanks Butch, I knew that, just forgot.

Jim...

On Jul 27, 2020, at 8:31 PM, Butch via groups.io <butch46988@...> wrote:

Jim,

While the original rears were 7/8", all of the replacements, for many years have been 3/4", as far as I know.
I do know, that all of the ones that we sol, were 3/4".

Butch

On 7/27/2020 8:12 PM, Jim Bollman wrote:
If you are working with new wheel cylinders did you put the right size in?

Wheel Cyl - 1??? front 7/8??? rear

If they are not new/rebuilt that would be a good place to start looking, could be a stuck cylinder.

Jim...

Re: Master Cylinder PSI

CHRIS BECKWITH

I’ve had hoses that  have collapsed internally in the past They don’t pass fluid and even hold pressure from returning crack the master cyl side of the lines and check that way

Sgt. Chris Beckwith ,
US ARMY Ret

On Jul 27, 2020, at 8:36 PM, Jim Bollman <Jim@...> wrote:

﻿Thanks Butch, I knew that, just forgot.

Jim...

On Jul 27, 2020, at 8:31 PM, Butch via groups.io <butch46988@...> wrote:

Jim,

While the original rears were 7/8", all of the replacements, for many years have been 3/4", as far as I know.
I do know, that all of the ones that we sol, were 3/4".

Butch

On 7/27/2020 8:12 PM, Jim Bollman wrote:
If you are working with new wheel cylinders did you put the right size in?

Wheel Cyl - 1??? front 7/8??? rear

If they are not new/rebuilt that would be a good place to start looking, could be a stuck cylinder.

Jim...

Re: Master Cylinder PSI

Jim Bollman

Thanks Butch, I knew that, just forgot.

Jim...

On Jul 27, 2020, at 8:31 PM, Butch via groups.io <butch46988@...> wrote:

Jim,

While the original rears were 7/8", all of the replacements, for many years have been 3/4", as far as I know.
I do know, that all of the ones that we sol, were 3/4".

Butch

On 7/27/2020 8:12 PM, Jim Bollman wrote:
If you are working with new wheel cylinders did you put the right size in?

Wheel Cyl - 1??? front 7/8??? rear

If they are not new/rebuilt that would be a good place to start looking, could be a stuck cylinder.

Jim...

Re: Master Cylinder PSI

Butch

Jim,

While the original rears were 7/8", all of the replacements, for many years have been 3/4", as far as I know.
I do know, that all of the ones that we sol, were 3/4".

Butch

On 7/27/2020 8:12 PM, Jim Bollman wrote:
If you are working with new wheel cylinders did you put the right size in?

Wheel Cyl - 1??? front 7/8??? rear

If they are not new/rebuilt that would be a good place to start looking, could be a stuck cylinder.

Jim...
_._,_._,_

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Re: Master Cylinder PSI

Jim Bollman

If you are working with new wheel cylinders did you put the right size in?

Wheel Cyl - 1” front 7/8” rear

If they are not new/rebuilt that would be a good place to start looking, could be a stuck cylinder.

Jim...

On Jul 27, 2020, at 7:39 PM, dale@... <Dale@...> wrote:

Its not the master you have a plug somewhere or the pipe is smashed somewhere.

On Jul 27, 2020, at 3:20 PM, James Dlapa <crosley1980@...> wrote:

﻿

Did you replace your wheel cylinders, they very well may have accumulated rust  restricting movement.

On Mon, Jul 27, 2020 at 3:15 PM Tilden Drinkard <TILDENLD@...> wrote:
I'm having trouble getting enough hydraulic pressure to the rear wheels. Only enough pressure to deploy one shoe at a time ????? I've purged & bled all lines.
So I'm going back to basics & testing the new master cylinder. My calculations say that the 1" bore should produce about 166 lbs PSI. Can anybody
verify that fact?

Thanx, Skip D

Re: Master Cylinder PSI

dale@servicemotors.net

Its not the master you have a plug somewhere or the pipe is smashed somewhere.

On Jul 27, 2020, at 3:20 PM, James Dlapa <crosley1980@...> wrote:

﻿

Did you replace your wheel cylinders, they very well may have accumulated rust  restricting movement.

On Mon, Jul 27, 2020 at 3:15 PM Tilden Drinkard <TILDENLD@...> wrote:
I'm having trouble getting enough hydraulic pressure to the rear wheels. Only enough pressure to deploy one shoe at a time ????? I've purged & bled all lines.
So I'm going back to basics & testing the new master cylinder. My calculations say that the 1" bore should produce about 166 lbs PSI. Can anybody
verify that fact?

Thanx, Skip D

Re: Master Cylinder PSI

Butch

My guess is, you have a stuck piston, a bad rubber line or the shoes are not properly adjusted. You do know that each shoe, on each wheel, must be adjusted separately and the each shoe has two adjustment points on it.

Butch

On 7/27/2020 6:15 PM, Tilden Drinkard wrote:

[Edited Message Follows]

I'm having trouble getting enough hydraulic pressure to the rear wheels. Only enough pressure to deploy one shoe at a time ????? I've purged & bled all lines.
So I'm going back to basics & testing the new master cylinder. My calculations say that the 1" bore should produce about 127.4 PSI. Can anybody
verify that fact?

Thanx, Skip D
--
This email has been checked for viruses by Avast antivirus software.
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Re: Master Cylinder PSI

James Dlapa

Did you replace your wheel cylinders, they very well may have accumulated rust  restricting movement.

On Mon, Jul 27, 2020 at 3:15 PM Tilden Drinkard <TILDENLD@...> wrote:
I'm having trouble getting enough hydraulic pressure to the rear wheels. Only enough pressure to deploy one shoe at a time ????? I've purged & bled all lines.
So I'm going back to basics & testing the new master cylinder. My calculations say that the 1" bore should produce about 166 lbs PSI. Can anybody
verify that fact?

Thanx, Skip D

Master Cylinder PSI

Edited

I'm having trouble getting enough hydraulic pressure to the rear wheels. Only enough pressure to deploy one shoe at a time ????? I've purged & bled all lines.
So I'm going back to basics & testing the new master cylinder. My calculations say that the 1" bore should produce about 127.4  PSI. Can anybody
verify that fact?

Thanx, Skip D

Hemmings Features Crosley Nationals

Jim Bollman

Our Virtual Nationals got a mention by Dan Strohl on the Hemmings blog. A Crosley special is featured in the same post.

Re: Restoration tips for beginners

Rich Childs

Very good write up.    I painted a number of 50s cars with Dulux in the 80s.   With a bit of buffing they would always look great.   Have a 48 Frazer now with 2 tone finish thaT I suspect is Dulux. Not my work but it is easy to keep looking good.

On Monday, July 20, 2020, Tim Hamblen via groups.io <flinttim=yahoo.com@groups.io> wrote:
Here's a good read on the paints we use today VS the paints we used back in the olden days.It points out what I have always suspected about base coat / clear coats.

https://medium.com/@benklesc/when-paint-jobs-lasted-forever-the-lost-art-of-single-stage-9f99973befaf

--
Rich Childs

Re: Restoration tips for beginners

Tim Hamblen

Here's a good read on the paints we use today VS the paints we used back in the olden days.It points out what I have always suspected about base coat / clear coats.

https://medium.com/@benklesc/when-paint-jobs-lasted-forever-the-lost-art-of-single-stage-9f99973befaf

Re: Restoration tips for beginners

Ron D.

Thanks for the advice Tim. Just to clarify, I was talking using rattle can primer and paint on all the dozens of misc metal pieces I've taken off the car, as opposed to setting up a spray gun every time I needed to paint a few brackets or whatever misc pieces I just cleaned up. I would never try to paint the car body with spray cans.

Re: Restoration tips for beginners

Tim Hamblen

Yep, I was buffing the hood on our 50 and suddenly on that part that rolls off the top and down the side I could see the primer sort of showing thru. I wasn't in it but the color was showing thru the off white paint. Stop, sand, recoat, do it again.Just watch the rotation of the buffer and make sure on any edge the buffing wheel is coming off the edge and not cutting into it.

Re: Restoration tips for beginners

Robert Kirk

Good advice Tim.  When you use a buffer be judicious, it is very easy to get carried away and burn through to metal.

Re: Restoration tips for beginners

Tim Hamblen

You have options, don't discount yourself. For what you will pay for a whole bunch of rattle can paint you can pick up a very serviceable gun at Harbor Freight or other discount places.Any of those will do a better job than rattle can. Just get one and practice. Single stage acrylic is probably easiest for a new person but I will defer that to a real expert of which I am not.Your best bet is to watch  videos on youtube. There are videos on the cheaper paint guns like Harbor.My gun right now is a Sprayit gravity gun. A pro painter recommended it to me as a very good low cost gun.Now I'll pull the curtain back a little and let out something almost no one outside my closest Crosley friends know. Take a look at my grandson's Hot Shot (Jackson Ross and the Youth Project Hot Shot). Not bad eh ? That is International Blue implement paint from Van Sickle. I wanted something he could work with that if he screwed it up we'd not be out much. It's an alkyd enamel (oil base) and we used Van Sickle primer and used a hardener in the paint. The "experts" on various Internet forums poo poo the implement paint saying it will fade out in the sun over time. Really ? How much do our Crosleys spend out in the sun ? If 24/7/365 probably will fade. So will rattle can paint which is alkyd enamel. Sure he got some runs and had some trash in it but he colored sanded with 1200 grit and then he was instructed on the use of a buffer, first cutting compound and then polish compound.Now to really pull the curtain back..................all my Crosleys are shot with implement paint, including the yellow sedan delivery I just showed in the Virtual Show.For cars that spend vast amounts of time indoors the alkyd enamel works very nicely. Have to use the hardener, that's what keeps the shine and produces a nice hard finish. Well, now the cat's out of the bag.

Re: Restoration tips for beginners

Thanks for all the feedback everyone. I'm sure this will help more than just me.
Gabe.

On Sun, Jul 19, 2020, 11:51 AM dave p <dave@...> wrote:
Great Post,  Tim...   with good advice about primers, paints , and buffing.......

Your best point is  "  Talk to real experts about.... ( anything) "      ....

Most of us who have been doing restorations for many years,  are willing to pass along tips and don't do(s) ,

Dave Perry

OldSchool Restorations of North Alabama USA

www.race-cardrivers.com/shop.htm

Re: Restoration tips for beginners

dave p

Great Post,  Tim...   with good advice about primers, paints , and buffing.......

Your best point is  "  Talk to real experts about.... ( anything) "      ....

Most of us who have been doing restorations for many years,  are willing to pass along tips and don't do(s) ,

Dave Perry

OldSchool Restorations of North Alabama USA

www.race-cardrivers.com/shop.htm

Re: Restoration tips for beginners

Ron D.

So Tim, what type of spray paint and primer do you suggest? Some cans say enamel, some say acrylic and some say oil based. I don't have a spray gun or the ability to mix up my own paints and primers, so rattle cans are my only other option.