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08-12-2015, 09:38 PM | #1 |
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clutch master ideas for 70 k20 nv4500 swap w/internal slave?
i'm tentatively looking at a .700 bore wilwood master since stock is something like .690(i think). anyone care to share clutch mc woe's or triumphs?
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
08-12-2015, 09:50 PM | #2 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
Quote:
I can't help with the clutch master/slave but here is how I did my NV4500.... http://67-72chevytrucks.com/vboard/s...d.php?t=673588 It depends on what style of NV4500 you have though. LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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08-13-2015, 11:41 PM | #3 |
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
too late now for me to do that but thanks for the interesting read. i do miss not being able to run the 12" clutch anymore. all crickets on clutch masters?
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
08-14-2015, 07:34 AM | #4 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
Quote:
LockDoc
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Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
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08-14-2015, 12:46 PM | #5 |
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Location: Traverse City MI
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
Not sure why you can't run a 12 in clutch BUT the master you have picked might be a bit small. Wilwood has a 1 in diameter master which is what I use in a 1991 miata I race in SCCA V8 Miata. The clutch is a Spec Stage 4 multi disc clutch and the throw out bearing requires just a bit more fluid than a 0.7 in master will supply to disengage it with a short throw. Fluid volume is what moves the bearing and the larger diameter the master (within reason) the easier the clutch will engage and dis-engage. Pedal throw is determined by where the master fulcrum is placed, not master volume.
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08-14-2015, 11:06 PM | #6 | |
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
Quote:
your car sounds like a blast!are you running a chevy motor rather than the smaller ford small block?i know a guy who fit a 5.0l in an rx-7 in tech school. do you need that much clutch for such a light car? golden advise for sure. my truck would still have an edeljunk on it and dump truck trans without it!
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
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08-28-2015, 10:01 PM | #7 |
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
pasted this here from my build thread to spur some more discussion!
did some pedal ratio and throw measurements on the stock clutch pedal with a bare floor and a 3/4" thick spacer under the pedal to compensate for sound deadener and floor mat in future. pedal is 14" long from center of pad to pivot 6 to 1 ratio is 2-1/3" down from the pivot and gives 1-3/8" throw 5 to 1 ratio is 2-4/5" down ,1-5/8" throw 3.5 to 1 ratio is 4" down, 2-1/4" throw had a friend measure his stock 2002 2500hd setup for me but he's lazy so i take these numbers with a grain of salt 24" pedal length 6.4 to 1 pedal ratio, rod is 3-3/4" down from the pivot,3-1/4" stroke. looking under the dash theres room to move the pivot up a bit above the hanger and extend the pedal by the same amount if i need to for extra leverage. also i think the stock internal slave master is 18mm from doing more looking on parts sites. i'm no expert but it seems a 6 to 1 pedal ratio is optimum? if my friends measurements are right i think i'll need a larger than stock master to move enough fluid?i ought to double check the throw.
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
09-01-2015, 02:25 AM | #8 |
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Location: Davis, California
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
I run a 13/16th" willwood with my external slave nv4500 and it has a ton of pedal travel. I would go with a 1" if you can find one
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09-01-2015, 12:04 PM | #9 | |
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Quote:
Also how far down do you have to push the pedal for it to disengage? One last question,how far down from the pivot is the pushrod attached? Thanks for the reply,rick Posted via Mobile Device |
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09-01-2015, 11:21 PM | #10 |
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Location: Davis, California
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
The pedal is effortless, its just a long throw.
Pushrod is 2" below the pivot and the the pedal moves 7.5". Thats from about 1" from the furthest it will come up to about 3/4" off the floor. I hope that helps |
09-02-2015, 12:22 AM | #11 |
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Location: San Jose Ca
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
I installed NV4500 in my 1971 I used the 1995 bell housing that came with the 4500. using the hydro parts from 1995 truck it is external set up. my engine is 2004 5.3 L
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09-02-2015, 01:07 AM | #12 | |
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
Quote:
your trucks not that ugly,you should have seen the factory puke yellow w/silver rattle can top on mine before i painted it! i wish i had some before pics to show. what intake setup did you run? i still haven't decided whether to try to keep the 2000 enclosed box or try something else?
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
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09-02-2015, 01:24 AM | #13 | |
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Quote:
I am running a bone stock 2003 5.3. Just bolted on some headers and rigged up an air filter. It's a pretty fun setup, enough power to get in trouble Posted via Mobile Device |
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09-02-2015, 01:43 AM | #14 | |
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
Quote:
how far down the pedal did you mount the pushrod? i've been checking on your build now and then since i thought about a crew cab when i started my build, nice man!
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
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09-06-2015, 11:06 PM | #15 |
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Posts: 163
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
copied from my build thread for you guys following this-
so i took a gamble and bought a clutch master gm#19183066 off ebay supposedly for 94-95 c2500 trucks(going off the ebay fitment guide) 18mm bore and 1.5" stroke. also 2 bolt flange for easier mounting than the 2000 master.its not plastic or aluminum either and being a gm part might allow easier replacement in the future. also the line points down where i want it and uses the russell adapter to the 4ft long -3an line that i have without another adapter stacked on that.i think a 3ft or slightly shorter clutch line will be perfect once the inner fenders are in and i can route it perfectly. i wound up mounting the pushrod 2.5" down from the pivot on the pedal since it gave me around 1-1/2" stroke of the pushrod and drilled the corresponding holes in the firewall to mount the master with the pushrod level. also cut and extended the pushrod 1.5" so the pedal would be up against the rubber stop. after getting it shoehorned in and bled by myself pretty good but not great i did the scientific test of pulling my truck to a hill and pushing down the pedal until it rolled. it started to disengage with the top of the pedal pad 4" from the floor and was free at 3" and had 2 more inches until the master bottoms out 1" from the bare floor. i'm hoping it will be enough to let it shift freely whenever i finally get it running! with help bleeding it the pedal disengagement should be a little higher and i'll shorten the pushrod so the pedal hits the floor right before the master bottoms out. also with power applied to the disk it will engage/disengage over more than the 1" of pedal throw it takes to roll or stop it on a shallow hill. even though it sounds touchy it actually felt pretty good. as far as pedal effort it might be very slightly more than stock setup with a 12" clutch with freshly greased up linkage. i put a spacer under the flange to tilt it up for bleeding that will come out when done the booster brace wound up in the way so i had to bend,cut and weld it to fit behind the resevoir. don't laugh at the linkage,its temporary until i buy a little heim joint and thread the pushrod for it. i figure its all temporary until it runs and is proven to work as desired.i plan on welding short pieces of pipe into the holes i cut in the firwall ribbing to stiffen them back up.i also might run a strap from one of the bolts to the brake pedal bracket under the dash as well to make sure it never flex fatigues and cracks.
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1970 k20 6.0l/nv4500/np205/14bff in progress build linkhttp://67-72chevytrucks.com/vboard/s...d.php?t=677014 |
09-07-2015, 02:20 AM | #16 | |
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Location: San Jose Ca
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Re: clutch master ideas for 70 k20 nv4500 swap w/internal slave?
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