aerosam
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| posted on 24/11/08 at 12:51 PM |
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mix and matching braking parts... unwise?
Hi guys,
I'm using m donor BMW E34 rear axle assembly. I know it's heavy, but it's a simple, well engineered IRS setup that comes complete
with an LSD that can easily take the torque of my V8.
Problem is up front the bmw front hubs are completely unsuitable. (they have been used successfully but i think it's a little beyond me) So if I
were to go for the standard sierra setup up front, am I going to cause myself horrible brake imbalance, as the bmw rear discs are qite big. Would I
need to upgrade to big brakes up front, or would a simple balance bar suffice?
Had enough of this dictatorship known as LCB. Gone elsewhere, not coming back. Kiss my ass ChrisW.
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Guinness
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| posted on 24/11/08 at 12:54 PM |
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You are going to need BIG BRAKES up front (IMHO)
I had an E39 540i V8 as a daily driver for a year. In that time it went through two sets of pads and discs! Mind you they were trying to stop a 2
tonne barge from silly speeds!
That engine is pretty damn heavy!
Mike
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fazerruss
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| posted on 24/11/08 at 12:55 PM |
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you could use a wilwood brake proportioning valve (lever type is best) mine was about 65 quid
"if assholes could fly this place would be an airport"
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aerosam
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| posted on 24/11/08 at 01:01 PM |
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quote:
Originally posted by fazerruss
you could use a wilwood brake proportioning valve (lever type is best) mine was about 65 quid
that sounds like a plan.
Had enough of this dictatorship known as LCB. Gone elsewhere, not coming back. Kiss my ass ChrisW.
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aerosam
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| posted on 24/11/08 at 01:02 PM |
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quote:
Originally posted by Guinness
You are going to need BIG BRAKES up front (IMHO)
That engine is pretty damn heavy!
Mike
it's 146kg, not too sure how that compares to the regular 4 cylinder car engines being used in locosts.
Had enough of this dictatorship known as LCB. Gone elsewhere, not coming back. Kiss my ass ChrisW.
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JAG
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| posted on 24/11/08 at 01:45 PM |
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4 cylinder car engines vary between 80kgs and 130kgs. Car gearboxes vary between 20kgs and 40kgs.
Bike engines are usually less than 80kgs including the gearbox.
All weights are approximate.
Justin
Who is this super hero? Sarge? ...No.
Rosemary, the telephone operator? ...No.
Penry, the mild-mannered janitor? ...Could be!
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contaminated
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| posted on 24/11/08 at 01:46 PM |
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A 2.0 litre Pinto weighs in at nearly 140 kg I believe, so it's not that bad.
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dinosaurjuice
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| posted on 24/11/08 at 02:07 PM |
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146kg is a good weight for a stonking great V8
i hate to think what my 2.0 tdci weighs 
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vinny1275
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| posted on 24/11/08 at 02:15 PM |
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quote:
Originally posted by dinosaurjuice
146kg is a good weight for a stonking great V8
i hate to think what my 2.0 tdci weighs
Isn't the tdci mostly alloy though? It's based on the duratec design iirc, so it shouldn;t be too bad,.....
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pewe
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| posted on 24/11/08 at 05:04 PM |
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IIRC for SVA/IVA you can't have an adjustable system i.e. brake balance bar has to be pinned and an adjustable proportioning valve is a no-no
for the test - after the test however.....
Generally use two masters - smaller diam to the front and larger to the back to achieve front balance. I'd be inclined to talk to Brian at BG
Motorsport as he's good on brake set-ups.
Cheers, Pewe 
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Antnicuk
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| posted on 24/11/08 at 09:38 PM |
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the bmw v8 is alloy hence not too heavy engine. good choice of donor, i had an E39 540 4.4 v8 on LPG and it was the best car i have owned.
If you end up with too much braking at the rear for the test and you cant fit a proportioning valve, you can cut down the friction material in the
rear pads until the rears dont lock until after the fronts. Bit crude but would get you through the test until you get an adjustable bias.
600 BHP per ton, Stylus Brought back from the dead! Turbo Rotary Powered!
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aerosam
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| posted on 24/11/08 at 10:46 PM |
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I have the slightly earlier M60 V8 but it is also all alloy. One of the problems it is causing is that the donor master cylinder is hydraulically
assisted from the power steering pump rather than a vacuum servo.
I was hoping to use as much of the donor as possible. Looks like more and more of it is headed for the scrap bin. But if I want a great car at the end
of it i'm just gonna have to suck it up.
Had enough of this dictatorship known as LCB. Gone elsewhere, not coming back. Kiss my ass ChrisW.
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DarrenW
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| posted on 25/11/08 at 01:27 PM |
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Im always wary of overbraking on the rear now. Had a Mk1 golf a while back - 16V engine etc, the mod of the day was to fit a rear disc conversion. I
did it and found it to be way overbraked and a waste of time doing it.
i would not be surprised to find that people with rear discs on a se7en have them biassed so far down that the rear brakes arent really doing much and
probs not much of an advantage over a good set of drums.
Bias bar will probs get you a lot of adjustment for the balance but be prepared for a bit of trial and error (hopefully not much error) to get the
balance right by playing with pad compounds etc.
In my earlier BMW days, i recall the E30 M3 was treat to the 5 series braking system and it was rather impressive.
Just as an aside - will you end up with 5 stud rears and 4 stud fronts?
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