Bigger rotors in 8x6.5 fashion

33744 Views 87 Replies 37 Participants Last post by DMANbluesfreak, May 9, 2016

DcSkater602

Discussion Starter · Jan 31, 2008 (Edited)

tossing an idea around...

did some searching couldnt find anything on this... ive seen a few people running 14" superduty rotors on 609's... im looking to run the standard 8x6.5 lug spacing

im looking to run a bigger rotor than the 12.5's... ill be running 17" wheels

anyone know of or used any larger rotors for this??? if i can find the right parts im gonna be mocking them to an 8 lug 44... eventually something for the 60 and building my own caliper brackets...

anyone know about like chevy 3500 HD with the higher GVW or anything... i know they got bigger brakes... any ideas???

thanks

1 - 20 of 88 Posts

Davethorik

· #2 · Jan 31, 2008

chevy 3500HD are 10 lug.

caryt

· #3 · Jan 31, 2008

Looking for the same answer.

BillaVista

· #4 · Jan 31, 2008

Wilwood I think have maybe an option or two. One for sure would be the rotor from their late model silverado big brake kit - not sure on it's diameter.

As far as matching a rotor and hat from them for 8 x 6.5 - I think it worked out that you had to run some crazy combo like a 16" rotor, don;t remember for sure??

Otherwise - make a list of the biggest trucks with 8x6.5 axles you can think of and spend some time at partsamerica.com or the like, many times the listings will give a diameter.

DcSkater602

Discussion Starter · #5 · Feb 1, 2008 (Edited)

caryt said:
Looking for the same answer.

yea ive been working on it... so far everything chevy or dodge and ford i can find is in the 12.5" diameter range... dodge 12.5" diameter rotors are 1.5" thick however...(slightly thicker than the chevy 8 lug 44 parts)

i was hoping to find a vehicle using these parts...that way replacements are always right down the street... and i get cost on them... not sure if going to waywood is worth it...

ill keep looking guys and see what i can come up with... itd be nice to be able to use a superdooty rotor.... in the 14inch(i think) variety... but im not really sure what kind of mess they would be to mate a 8x6.5 and the hub

dc

DcSkater602

Discussion Starter · #6 · Feb 1, 2008 (Edited)

it would be cool to re-drill the superduty rotor for 8x6.5 if you could...its 14.5inches x 1.4

the 8x170mm comes out to be about 6.7inch spacing... compared to what most of us need at 8x6.5...

input on clearancing 0.1" at each hole??? if done properly the studs would still hold it in place correctly and center it.. the other issue is its about 1" taller( from bottom to WMS) than the standard rotors... which would slide the rotor back on the hub more... might not clear

ill do more research

dc

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mikey_d05

· #7 · Feb 1, 2008

If you're going to go to that much work why not just rotate the whole damn thing and drill a fresh 8 on 6.5" pattern?

f250rollinon37s

· #8 · Feb 1, 2008 (Edited)

2

go for a 2006 dodge 3500 - 13.9"

taken from napa

part # UP 880143

OD 13.890"
height 4.010"
8x6.5"
discard thickness 1.339"
thickness 1.445"

list price 134.35 ( not counter price ) jobber cost is near $65

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RockHind

· #9 · Feb 1, 2008 (Edited)

I have been using the chevy 14" rotors from the p30, eighties into early ninties I think. They will fit over most hubs if you turn the hub down a little. (read hit it with my grinder while it spins like mad) So you can do a floating rotor type setup, they are dirt cheap, often under $30 and have the 6.5 x 8 pattern. They are kind of heavy, but what can you do for an off the shelf part. Gimme a minute and I will find a link and pic.

http://www.racepages.com/products/?uts=true&Ntt=W0133-1623710&submit.x=27&submit.y=12

Don't be causing a run on them, I still need a few more sets.

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DcSkater602

Discussion Starter · #10 · Feb 1, 2008 (Edited)

hahah np..will do.... wow perfect rotor...

heres the chevy rotor that is standard on the chebby 8 lug outers
Bolt Circle Diameter:6.5"
O.D.:12.5"
Discard Thickness:1.215"
Thickness When New:1.285"
Height:2.805"
Vented / Solid:Vented

and the p30 you gave me
Bolt Circle Diameter:6.5"
O.D.:14.235"
Discard Thickness:1.465"
Thickness When New:1.535"
Height:3.21"
Vented / Solid:Vented

the main difference is in the height... the hub on it is about .4" taller... i think it will clear... time will tell

if i can get a set mocked up i will make a caliper bracket for them to hold some sort of caliper... still looking at that... perfect thanks

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DcSkater602

Discussion Starter · #11 · Feb 1, 2008 (Edited)

3

hmmm caliper for the p30 wont work easily... ill have to find something with a threaded pin mount...much like the k20 stuff but that will fit over a 1.5 rotor...

foudn a caliper for a 88chevy G30 van... uses the pin bolts... the truck uses the 1.535 thick rotors too...

looks like a good possibility for a caliper... unless i can find a similar one in dual piston... however those chevy pins make it super easy to make a mount for

when looking at the first pic you can see that brake line location onto caliper is in a pretty nice spot too

dc

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DcSkater602

Discussion Starter · #12 · Feb 1, 2008

just went down and took some measurements on my 8 lug d44 stuff... no problem clearing the extra 0.4" of hat

dc

DcSkater602

Discussion Starter · #13 · Feb 2, 2008

update...sort of: the calieprs i picked up today were the wrong ones... new parts tommorow

both calipers and rotors are coming from a 1988 P30 chevy step van... with rear drums... ill be using these at all 4 corners...unless i go to a 13.8 inch rotor in the rear but i dont see the point...

rock hind... any info on where you got the rotors???? the calipers are dirt cheap but the rotors were about $75 Each!!! and thats my cost.... (napa price)

dc

BillaVista

· #14 · Feb 2, 2008

Watchin this one.

Excellent old-school tech.

Nice work!

52202

· #15 · Feb 2, 2008

BillaVista said:
Watchin this one.

Excellent old-school tech.

Nice work!

Possible future tech article ?

MADDOG

Gouky

· #16 · Feb 2, 2008

1997 f-250 4x4 front rotors are 8 on 6.5, 13" diameter and 1.25" thick.

the caliper is about 60$ that matches it, the bracket for the caliper is 20$ and available at advance auto parts.

all you need then are two 18mm bolts to attach it to something solid. no sliding mechanism needed because it's all built into the bracket.

RockHind

· #17 · Feb 2, 2008

DcSkater602 said:
update...sort of: the calieprs i picked up today were the wrong ones... new parts tommorow

both calipers and rotors are coming from a 1988 P30 chevy step van... with rear drums... ill be using these at all 4 corners...unless i go to a 13.8 inch rotor in the rear but i dont see the point...

rock hind... any info on where you got the rotors???? the calipers are dirt cheap but the rotors were about $75 Each!!! and thats my cost.... (napa price)

dc

I ordered them from the website I linked. Race Pages had some bad reviews, but I chanced it and a few days later the ups man showed up like he always does dropped them off had a soda and headed off again.

I used the calipers from the same vehicle, the 3500 superduty, heavy duty P30 calipers. I used them because in my early disc brake conversion days I wandered thru the junkyard comparing total caliper piston area and these calipers were the largest, and seemed easily mountable. The simplicity of the GM pin type escaped me for some reason. The drawback of these calipers is that the innerpad needs to be supported and guided by the caliper bracket. These calpiers are also found on some dodge trucks.

I will see if I can scare up some pics today.

Which calipers are you using, and what pricing did you get?

DcSkater602

Discussion Starter · #18 · Feb 4, 2008 (Edited)

a little update i just picked up the rotors... still hunting for calipers... i had a few calipers from the P30 that used the pin stlye mount... but none would clear the 1.535 thick rotors... the 11k GVW p30 uses the rubber and metal wedge pins for mounting...

pics later

thanks billavista...im using your Brake bible tech article to build my brakes lol

dc

rotors my price were $52 each...napa retails them at like 120 each!!!

heres a caliper that bolts directly to a caliper bracket... i could use this... ill be using 3/8 plate for the bracket anyways

still looking
dc

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ZukIzzy

· #19 · Feb 4, 2008

Try this and I am sure Scott can help you out http://www.pirate4x4.com/forum/showthread.php?t=645806

Wayne

comeonstart

· #20 · Feb 4, 2008 (Edited)

suscribing to this one
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ZOLOFT CLASSACTION

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