The V8 Owners Forum - Forum Index The V8 Owners Forum -
Welcome to the well-known V8 Owners Forum, no matter what you drive if its V8 Powered you'll be made very welcome.
 
 GarageGarage   1/4 Mile Table1/4 Mile Table 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

Servo vacuumed INFO

 
Post new topic   Reply to topic    The V8 Owners Forum - Forum Index -> Brakes & Suspension Area
View previous topic :: View next topic  
Author Message
redm6gtr
Newbie
Newbie


Joined: 03 Mar 2017
Posts: 3
Location: Surrey


PostPosted: Fri Mar 03, 2017 1:55 pm    Post subject: Servo vacuumed INFO Reply with quote

Does anybody no how much vacuumed is produced by the V8
I think I need to fit a 12volt vacuume pump to improve the brake servo/master cars braking
Thanks for any advise
fordpop52@aol.com
Back to top
View user's profile Send private message
DaveEFI
Forum Contributor
Forum Contributor


Joined: 26 Feb 2010
Posts: 3747
Location: SW London, UK


PostPosted: Fri Mar 03, 2017 2:29 pm    Post subject: Reply with quote

Pretty well all production vehicles fitted with the RV8 managed with a vacuum brake servo run from the inlet manifold.
_________________
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
Back to top
View user's profile Send private message
Blown v8
Gold Member
Gold Member


Joined: 25 May 2008
Posts: 325
Location: Kent


PostPosted: Fri Mar 03, 2017 4:33 pm    Post subject: Reply with quote

I used to run with twin servos,with a high lift cam on a blown rv8 with no problems
Back to top
View user's profile Send private message
stevieturbo
Forum Contributor
Forum Contributor


Joined: 18 Nov 2006
Posts: 3390
Location: Northern Ireland

1980 Ford Granada

PostPosted: Fri Mar 03, 2017 11:19 pm    Post subject: Re: Servo vacuumed INFO Reply with quote

redm6gtr wrote:
Does anybody no how much vacuumed is produced by the V8
I think I need to fit a 12volt vacuume pump to improve the brake servo/master cars braking
Thanks for any advise
fordpop52@aol.com


That very much depends on the engine.

But I can see very few applications needing an electric pump.
_________________
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0
Back to top
View user's profile Send private message
garrycol
Getting There
Getting There


Joined: 16 Jul 2015
Posts: 242
Location: Canberra, Australia


PostPosted: Fri Mar 03, 2017 11:33 pm    Post subject: Reply with quote

If you are having problems you then need to look at the plumbing to the booster (do you have it off the right takeoff - the pipe/outlet is about 10mm in size) or you have a booster problem.

If the problem persists you could always put in an alternator from a TDI or TD5 which has a inbuilt vacuum pump.

But there is no issues in an RV8 providing enough vacuum

Garry
Back to top
View user's profile Send private message
ChrisJC
Top Dog
Top Dog


Joined: 20 Nov 2006
Posts: 4465
Location: Northants / Cambs

1963 Land Rover Series II

PostPosted: Sat Mar 04, 2017 9:08 pm    Post subject: Re: Servo vacuumed INFO Reply with quote

redm6gtr wrote:
Does anybody no how much vacuumed is produced by the V8
I think I need to fit a 12volt vacuume pump to improve the brake servo/master cars braking
Thanks for any advise
fordpop52@aol.com


A Rover V8 in good condition (like pretty much all petrol engines) will pull an almost total vacuum under overrun conditions.

Chris.
_________________
--
Series IIA 4.6 V8
R/R P38 4.6 V8
Back to top
View user's profile Send private message Visit poster's website
redm6gtr
Newbie
Newbie


Joined: 03 Mar 2017
Posts: 3
Location: Surrey


PostPosted: Sat Mar 04, 2017 10:49 pm    Post subject: Rover V8 brake issue Reply with quote

Guys
The rover is fitted with a fast road cam the inlet is an Offernhouser fitted with a pair 45 Weber carbs also a Mallory dist
The brakes were a 7 inch servo with a mark 2 jaguar master
They both needed replacing so I fitted a new servo with a 1 inch bore master
A mistake it should have been a 7/8 bore
There is a one way in the servo pipe
So now I have another master on order and will fit a 12 volt power servo pump from a BMW/VW for extra vacuum
So we will see how it goes
Back to top
View user's profile Send private message
stevieturbo
Forum Contributor
Forum Contributor


Joined: 18 Nov 2006
Posts: 3390
Location: Northern Ireland

1980 Ford Granada

PostPosted: Sun Mar 05, 2017 12:15 am    Post subject: Reply with quote

are you sure your existing servo is fitted/adjusted correctly and actually holds vacuum ?

Whatever level of vacuum that may be
_________________
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0
Back to top
View user's profile Send private message
unstable load
Top Dog
Top Dog


Joined: 04 May 2009
Posts: 1108



PostPosted: Sun Mar 05, 2017 4:52 am    Post subject: Reply with quote

I'm with stevieturbo here... are you sure the Booster is good? You shouldn't need additional gubbins if it is all good.

The only difference a bigger master cylinder has is more pressure required on the pedal, boost is not affected by the M/C.
_________________
Cheers,
John
Back to top
View user's profile Send private message
redm6gtr
Newbie
Newbie


Joined: 03 Mar 2017
Posts: 3
Location: Surrey


PostPosted: Sun Mar 05, 2017 9:11 am    Post subject: Servo Reply with quote

Brand new servo just fitted
Back to top
View user's profile Send private message
mike-b
Gold Member
Gold Member


Joined: 25 Mar 2010
Posts: 194
Location: Markfield, Leicestershire.


PostPosted: Sun Mar 05, 2017 2:56 pm    Post subject: Reply with quote

Others reading this may well know better but to raise a point - Would a leaking inlet manifold not play a part of the problem, or even be it?
_________________
Mike B Drives a 1984 Mk2 Granada ghia V8.
Back to top
View user's profile Send private message Send e-mail
ChrisJC
Top Dog
Top Dog


Joined: 20 Nov 2006
Posts: 4465
Location: Northants / Cambs

1963 Land Rover Series II

PostPosted: Sun Mar 05, 2017 7:06 pm    Post subject: Reply with quote

You could measure the vacuum........

Chris.
_________________
--
Series IIA 4.6 V8
R/R P38 4.6 V8
Back to top
View user's profile Send private message Visit poster's website
DaveEFI
Forum Contributor
Forum Contributor


Joined: 26 Feb 2010
Posts: 3747
Location: SW London, UK


PostPosted: Mon Mar 06, 2017 9:18 am    Post subject: Reply with quote

mike-b wrote:
Others reading this may well know better but to raise a point - Would a leaking inlet manifold not play a part of the problem, or even be it?


I'd have thought you'd notice that by poor engine performance before the brakes?
_________________
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
Back to top
View user's profile Send private message
stevieturbo
Forum Contributor
Forum Contributor


Joined: 18 Nov 2006
Posts: 3390
Location: Northern Ireland

1980 Ford Granada

PostPosted: Mon Mar 06, 2017 2:20 pm    Post subject: Reply with quote

DaveEFI wrote:
mike-b wrote:
Others reading this may well know better but to raise a point - Would a leaking inlet manifold not play a part of the problem, or even be it?


I'd have thought you'd notice that by poor engine performance before the brakes?


Possibly...but I dont think there has been a proper explanation of what is even wrong with the brakes ?
_________________
9.85 @ 144.75mph
202mph standing mile
http://www.youtube.com/watch?v=XgWRCDtiTQ0
Back to top
View user's profile Send private message
garrycol
Getting There
Getting There


Joined: 16 Jul 2015
Posts: 242
Location: Canberra, Australia


PostPosted: Mon Mar 06, 2017 10:37 pm    Post subject: Reply with quote

Yes - is the booster connected to a small bleed port in the manifold or a proper large bore bore specifically the size for a booster? Also the brakes seem to be a mish mash of components that may not be compatible with each other.

I doubt a vaccum pump will fix the issue if the same size plumbing as is in place now is used.

The RV8 develops plenty of vacuum - as evidenced by the hundreds of thousands of setups around the world that are working fine - so there is something wrong with the OPs set up not the vacuum.

garry
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    The V8 Owners Forum - Forum Index -> Brakes & Suspension Area All times are GMT
Page 1 of 1

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
Make payments with PayPal - it's fast, free and secure!


Copyright www.v8forum.co.uk 2006. All Rights Reserved,
Forum Disclaimer: Any posts in the V8 Forum are posted by individuals acting in their own right and do not necessarily reflect the views of the owner, administrators or moderators.