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Richard Greene
Frequent User
Username: benzjag

Post Number: 221
Registered: 12-2012
Posted on Thursday, 03 September, 2020 - 04:52:   Edit PostDelete PostView Post/Check IP

Would anyone know how much vacuum a 1980 Shadow's engine should produce?

Thanks!

Richard
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ross kowalski
Prolific User
Username: cdfpw

Post Number: 1469
Registered: 11-2015
Posted on Monday, 07 September, 2020 - 22:35:   Edit PostDelete PostView Post/Check IP

Richard,

I'm surish my 1970 vacuum readings would be identical to yours.

I'll try and get a gauge on my car later.

I forget what it read, but I would think 20 in or do at idle. Maybe 21.
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ross kowalski
Prolific User
Username: cdfpw

Post Number: 1480
Registered: 11-2015
Posted on Monday, 14 September, 2020 - 07:39:   Edit PostDelete PostView Post/Check IP

I just measured the vacuum with a warm engine


https://www.youtube.com/watch?v=WvjqVXT-9XI
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Richard Greene
Frequent User
Username: benzjag

Post Number: 222
Registered: 12-2012
Posted on Monday, 14 September, 2020 - 09:42:   Edit PostDelete PostView Post/Check IP

Ross,

A HUGE thank you for your time to check the vacuum! Really appreciate the video!

I just bought a 80 Wraith with severe brake problems! The owner almost gifted me the car. My mechanic wants to use it to convert the system to standard brakes. If anyone can, he will. I will update in a separate thread the progress. His only concern was the vacuum;therefore, my question.

Thanks again!

Richard
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ross kowalski
Prolific User
Username: cdfpw

Post Number: 1482
Registered: 11-2015
Posted on Monday, 14 September, 2020 - 10:14:   Edit PostDelete PostView Post/Check IP

Richard,

First, that car is gorgeous and getting it for a song means I ofically hate you. Sorry.

Second, Before you get on to converting the brakes, I would suspect that you are not that far out on getting the actual brakes working. Looking at that car, it is not as bad as you think.

Third, While you have enough vacuum to run a vacuum booster, IF you went the replacing the brakes route, you really should use a GM hydroboost system rather than a vacuum diaphragm system. The pressure will be much closer to the original. The car probably has a saginaw pump which means all standard GM fittings.
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Omar M. Shams
Grand Master
Username: omar

Post Number: 2082
Registered: 04-2009
Posted on Monday, 14 September, 2020 - 15:46:   Edit PostDelete PostView Post/Check IP

I have seen Shadows converted to booster systems and every time this has resulted in disaster.
Fix the original system or scrap the car. There is no alternative.
Thanks
Omar
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Geoff Wootton
Grand Master
Username: dounraey

Post Number: 2225
Registered: 05-2012
Posted on Monday, 14 September, 2020 - 16:07:   Edit PostDelete PostView Post/Check IP

I agree with Omar and can't help thinking how much easier it would be to simply repair the existing system.
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Omar M. Shams
Grand Master
Username: omar

Post Number: 2083
Registered: 04-2009
Posted on Monday, 14 September, 2020 - 17:07:   Edit PostDelete PostView Post/Check IP

You are totally right Geoff. The system is much easier to repair than to replace. Even if every single component is overhauled.
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David Gore
Moderator
Username: david_gore

Post Number: 3787
Registered: 04-2003
Posted on Monday, 14 September, 2020 - 17:56:   Edit PostDelete PostView Post/Check IP

Having done a complete Shadow hydraulic system overhaul, it is not as difficult as you might think provided you use the Workshop manual TSD4200 available for free download from the Technical Library and the resources of this forum when in doubt:

http://rrtechnical.info/SY/TSD4200/tsd4200.html
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Larry Kavanagh
Frequent User
Username: shadow_11

Post Number: 666
Registered: 05-2016
Posted on Tuesday, 15 September, 2020 - 09:14:   Edit PostDelete PostView Post/Check IP

I would also recommend servicing the existing hydraulic brake system, it's the easiest option and avoids devaluing the car.
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Kelly Opfar
Frequent User
Username: kelly_opfar

Post Number: 256
Registered: 07-2004
Posted on Tuesday, 15 September, 2020 - 09:31:   Edit PostDelete PostView Post/Check IP

Richard, I'm in the USA and I can help you get your brake components in working order. Email me:
Kelly@BritishToolWorks.com

http://BritishToolWorks.com
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ross kowalski
Prolific User
Username: cdfpw

Post Number: 1484
Registered: 11-2015
Posted on Tuesday, 15 September, 2020 - 11:01:   Edit PostDelete PostView Post/Check IP

Richard,

What is the braking system currently doing?

Is it intact and complete?

If the underside of that car is as clean at the top I bet it would be a honey to work on.

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