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Irv83
PostPosted: Sun Sep 15, 2013 5:07 pm 
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Joined: Thu Jan 21, 2010 11:28 am
Posts: 318
Location: Shelton, Ct.
Can anyone help me with the diameter of the 300ZX power brake booster ? I'm hoping it's 8" so it will fit in a 240.
Thanks in advance,
Irv Rich

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Gregmatic
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PostPosted: Mon Sep 16, 2013 11:03 am 
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I have fitted a booster from an 88 300zx (same turbo or n/a) to my 280z. It is larger in diameter and the bolt pattern is different. You will need to drill new pilot holes in the firewall and fabricate and/or modify your brake pedal bracket. I am using the brake pedal & bracket from the same Z31 so as to avoid any fitment issues. I haven't mounted up the master cylinder yet, unsure if any fitment issues will arise with this part yet...
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Irv83
 Post subject: 300zx brake booster
PostPosted: Mon Sep 16, 2013 11:13 am 
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Joined: Thu Jan 21, 2010 11:28 am
Posts: 318
Location: Shelton, Ct.
Many thanks. I should have specified '90 - '95 300zx. I think they're smaller in dia.

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Mike Rosann
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PostPosted: Mon Sep 16, 2013 2:51 pm 
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Posts: 231
Hi Irv,
I measured my 94 300ZX N/A and as best as I can tell it's very close to 9 inches. It's hard to get an exact measurement as the engine compartment is very crowded.
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padam07
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PostPosted: Mon Sep 16, 2013 4:55 pm 
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Joined: Sat Feb 16, 2013 3:42 pm
Posts: 282
Location: Rochdale, MA
Measure the circumference and then divide that number by 3.14. That's your diameter.

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Adam Perry
Datsun 260Z
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Frank T
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PostPosted: Mon Sep 16, 2013 8:20 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
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Location: CT
HA!! That's exactly what I came on here to say! :D

Our 8th grade math teachers would be proud of us (if mine were still alive) :roll: .

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Paul
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PostPosted: Tue Sep 17, 2013 9:51 am 
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Joined: Wed Jul 23, 2008 2:38 pm
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Location: rhode island
PIE anyone. 8)
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Mike Rosann
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PostPosted: Tue Sep 17, 2013 1:17 pm 
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Joined: Thu Sep 29, 2005 6:44 pm
Posts: 231
I can see you guys haven't had the pleasure of working on a 90-96 300ZX. The power brake booster is in the upper right of the attached photo. You can see about half of it. Getting a tape around it would be difficult.


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DSC00025 (2).JPG
DSC00025 (2).JPG [ 555.63 KiB | Viewed 6971 times ]
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Irv83
 Post subject: 300/ZX Brake booster
PostPosted: Tue Sep 17, 2013 5:25 pm 
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Joined: Thu Jan 21, 2010 11:28 am
Posts: 318
Location: Shelton, Ct.
Thanks mike; AND the math teachers. Could you get a tape measure in to measure either the radius (like one slice of a piece of PIE?), or roughly, the diameter. Im hoping it's close to 8", with it's double diaphram.

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Frank T
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PostPosted: Tue Sep 17, 2013 5:27 pm 
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Location: CT
What do you think, Adam? Piece of string, pulled around the booster with a bent coat hanger, then measured?

Pfft! That's easy. 8)

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padam07
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PostPosted: Tue Sep 17, 2013 5:43 pm 
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Joined: Sat Feb 16, 2013 3:42 pm
Posts: 282
Location: Rochdale, MA
ha ha... I say remove the driver side engine mount jack the motor from below. Then maybe there will be enough space!! :D

I like Irv's idea. Measure the radius and go from there.

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Adam Perry
Datsun 260Z
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Frank T
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PostPosted: Tue Sep 17, 2013 6:02 pm 
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Joined: Wed Apr 09, 2008 5:53 pm
Posts: 14781
Location: CT
Well, there's an easier way.
Mike, if you can take exact measurements of a chord and the arc length (the distance btwn points A and B, both directly thru the circle and also around the perimeter) we can compute the diameter, and from there the circumference.
I have long ago burned all my Sine and Cosine charts, but I suspect they are available today online.


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Chord.jpg
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Irv83
 Post subject: 300zx booster
PostPosted: Tue Sep 17, 2013 6:30 pm 
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Joined: Thu Jan 21, 2010 11:28 am
Posts: 318
Location: Shelton, Ct.
Guys, I DON'T GIVE A RATS REAR ABOUT ANYTHING but the DIAMETER, and maybe he thickness, to see if it will fit my 240. I need all of the brake help Ican get.

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Frank T
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PostPosted: Tue Sep 17, 2013 7:10 pm 
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Location: CT
At Ease, Marine! We're trying to figure out the circumference of the brake booster for you. If we can get those two dimensions I asked for, we can compute the circumference without asking Mike to disassemble his engine bay to measure around the outside.

If you would prefer that I get un-involved with this, just say so. I hate math and wasn't looking forward to opening that musty old Geometry dungeon in my Brain Housing Group, anyway.

Must be a full moon.... :roll:

Frank

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Irv83
 Post subject: Brakes
PostPosted: Wed Sep 18, 2013 8:07 am 
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Joined: Thu Jan 21, 2010 11:28 am
Posts: 318
Location: Shelton, Ct.
Sorry, Frank. Maybe it IS the full moon. But really, the EASIEST measurement to get is to just stick a ruler or tape measure in there, (measuring from the center to the outer edge), and doubling it. Ill get in touch with the guy I sold my 300zx tt to, and see if he can do it.

Thanks, evveryone , for your help.

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