I need a source for cross drilled front brake rotors for 4 my lug 1974 porsche 914.
I have thus far only found Zimmerman for 1970 through 1972! but for Cheap= <$50.00! Some one also tried telling me that all 914 brake rotors are the same from 1970 - 1976?
What gives?
"Someone" was pulling your leg. The 73-76 rotors are different; they will not fit correctly on the early struts with early calipers.
Cross-drilling a solid rotor, like the ones on a 914-4, is useless IMHO. Plus it leads to cracking, which lets you throw away the rotor when you notice the crack.
Pelican used to carry the cross-drilled Zimmerman ones; not sure if we still do.
--DD
Now if only someone made a kit for 4-lug vented and cross-drilled or slotted rotors
I have the 4 bolt ALLOY hubs and are using gas slotted rotors that also have had the cold treatment. My shop said the early carrera rotors are also available cross drilled but that is pretty useless unless you are racing in the mud or heavy rain or something (that should start the fur flying). Anways I'd say get a set of them.
QUOTE (Brando @ Jan 10 2006, 06:47 PM) |
Now if only someone made a kit for 4-lug vented and cross-drilled or slotted rotors |
QUOTE (Cap'n Krusty @ Jan 10 2006, 07:28 PM) | ||
Like DDD said, a waste of time and money. Cross drilling and/opr slotting provides NO improvement in stopping or cooling. In fact, there are well researched studies out there that prove the opposite is true. The Cap'n |
QUOTE |
Cross drilling and/opr slotting provides NO improvement in stopping or cooling. In fact, there are well researched studies out there that prove the opposite is true. The Cap'n |
WOW!
pretty strong opinions on this subject. Atleast from the contributing members!
Sounds pretty unanymous here!
But I am confused as to why there is a market and a production line of solid brake rotors with the inferred liability?
I seek enlightenment.
Is cross drilling vented rotors o.k. but not solid? If so then why? Aren't vented rotors as... if not more likely to rust and or stress crack if not more so because of decreased wall thickness per side? I see the obvious benefits of Vented rotors over solid cross drilling aside.
But aside from spending several thousand dollars in doing a tire / wheel / brake conversion....etc. to accomodate a vented rotor upgrade.
I pose the question: I have seen some very expensive high performance cars oem w/ cross drilled vented rotors and are the physics and benefits of the vented rotor that different as to make it a benefit in the vented variety and a liability or hazard when solid?
Just playing the devil's advocate here anyone can sing to the choir.
thanks for the input. This site is great!
I've run the drilled, non-vented front discs on my VW Vanagon 4WD / 3.2 911 engine power. It dramatically stopped the 5,000 lb brick much better than the solid discs. However since there is NO where for the hot (braking) gasses to escape from, the discs get very hot -very fast. The discs actually would wear in a "Washboard" pattern-and the brake pads had a mated washboard look as well.
The drilled rotors had a life of 12,000 miles, so they got changed every year, cause they could not be turned/ cleaned up to spec.
Also note that heat can set up cracks between the drilled holes- and that's a situation you don't need
Last year, I ordered a catalog from FVD in Florida,
http://www.fvd-web.com/fvd-usa/
their catalog 'lists' Cross Drilled Brake Rotors for the 914.
One of their guys hangs out (and sponsors) over on 6speedonline.com
I sent this guy an email asking.... "Hey do you guys in fact carry these
rotors for the 914????
He said he'd check on it and came back and said Yes they did.
I said, now you know the 914 is 4-LUG right?
"Yep, we know that".
You could check with them.
I was just wondering if this would be good
It sounds like "No".
Do any production cars use a drilled or slotted solid rotor?
Thanks
KT
QUOTE (Brando @ Jan 10 2006, 08:33 PM) | ||||
So, no vented 4-lug rotors around because they're a waste of time and money? Compared to a full 5-lug conversion for vented rotors and different calipers? |
here you go.....4 lug vented (and drilled if you want or slotted)
billet hubs (see 914 store)
+
(drilled rotor available @ Vertex Auto for $79 plus other places)
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I got 4 lug cross-drilled rotors for my car from a company called Troutman in Temecula, Ca. I don't have a number but they sometimes have an add in Excellence. I only use them cause they look cool. My car still looks better than Aarons even with his cheap ass paint job.
Elliot
Attached image(s)
QUOTE (Mueller @ Jan 10 2006, 11:42 PM) |
here you go.....4 lug vented (and drilled if you want or slotted) billet hubs (see 914 store) + (drilled rotor available @ Vertex Auto for $79 plus other places) |
Mueller,
I know these billet hubs are for the '73 and up models, but what would be the problem if you would try to fit them on an early model?
I ask as I would like to know if they would fit a VW412S (my other car), which uses the same rotors as the early 70-72 914...
Just look at it as maybe a possibility to expand the market for them
Best regards,
Walter
QUOTE (pnewman @ Jan 10 2006, 08:32 PM) |
Is cross drilling vented rotors o.k. but not solid? If so then why? Aren't vented rotors as... if not more likely to rust and or stress crack if not more so because of decreased wall thickness per side? I see the obvious benefits of Vented rotors over solid cross drilling aside. |
Thanks for the info Dave. Slotted seems to be a good (reduced cracking possibility solution for improving braking over cross drilled.
Now where can I get some 74 / 4 lug replacements slotted or vented or cross-drilled discs.... with only replacing the rotors themselves: i.e. direct fit?
I contacted Vertex and someone there emailed me stating that they sell only replacement discs.
thanks,
QUOTE (Walter @ Jan 11 2006, 01:50 PM) |
Mueller, I know these billet hubs are for the '73 and up models, but what would be the problem if you would try to fit them on an early model? I ask as I would like to know if they would fit a VW412S (my other car), which uses the same rotors as the early 70-72 914... Just look at it as maybe a possibility to expand the market for them Best regards, Walter |
QUOTE |
Now where can I get some 74 / 4 lug replacements slotted or vented or cross-drilled discs.... with only replacing the rotors themselves: i.e. direct fit? |
QUOTE (pnewman @ Jan 18 2006, 12:36 PM) |
Now where can I get some 74 / 4 lug replacements slotted or vented or cross-drilled discs.... with only replacing the rotors themselves: i.e. direct fit? |
Dave always is well informed...damn...
How about these;
http://www.performancerotors.com/catalog/product_info.php/products_id/614?osCsid=75807564d2ed4193d3abd1b7302492c3
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