Zedyone_kenobi

Cannon Manifold and three 40 DCOE 151 (spanish pedigree) weber 151s. I have had these apart and cleaned them but they still need to be gone through and verified. I had them on my Z car running since 2012. Pulled them off and need the space in my garage. Comes with oversized rod ends, and throttle arm mounting bar (less deflection), which is a modification of my own. Carbs are complete. I am pretty sure I have the air horns that came with them. I can ship to anywhere in the CONTIENTAL US, but shipping will be on the purchaser. I will box them up in a protected WEBER carb box individually. For the manifold and carbs I am asking 800 dollars plus shipping. Please give me an email at sdamico555@Gmail.com

I have always wondered why a vacuum pump on a booster would not do the exact same thing as manifold vacuum. It would not even need to be that big a pump as the master vac is relatively small. Only need to maintain about 45 mmhg.

My new check valve came in today so I will be seeing how it performs on the car compared to the one I have currently. I suspect it will be identical, but we will see. I was walking the dog the other morning and a thought came to my mind. My brake pedal has great initial bite, but then goes hard as a rock, with no give in the pedal. I also recalled that while the car is in neutral, I cannot roll it. At all. Takes every ounce of strength to push it. When all parts were more 'fresh', I could push it up and down the garage with relative ease with one hand. Just to further flush this out, I am jacked up both sides by the diff adn wanted to see if I could spin the rear tires with the car in neutral. NADA. Drums are darn near seizing up the rear end. How long has this been going on? Not sure, I drove it around town about a month ago. No issues, but again, car did not want to roll without engine help. I now suspect something is amiss with the wheel cylinders / emergency brake adjustment. Perhaps a complete brake overhaul is not needed. Maybe just a refresh of the rear and some better pads would do on all four corners. I think rear disks would be a worthy upgrade. Anybody running around with just a rear disk brake swap.

You are correct, I always has a very good pedal feel and then I did not. I think part of the issue is a bad check valve, and here is why I say that. I ran the check valve test with a vacuum gage installed down stream of the check valve in between the check valve and the brake booster. Warmed up the engine Let the vacuum gage settle down to about 45 mmHg or so (I think that was the number) Shut off the car and watched. The needle proceeded to drop and drop and drop and drop down to zero after about a minute or so. If memory serves last time I did this test, it held. So I ordered a new one. I will have to see if this helps or not. Either way, I suppose it is time to change it out as I installed that one back in 2009 according to my Z maintenance book I keep.

Front willwoods look awesome. Will they fit under a 15" panasport though. I have no desire to change wheels. I love my old panasports. Reaction disk had occured to me, but I was under the impression those fall out during installation. IF it was right for years, how could it fall out now? I need to go back to the manuals and check. 8.5" Brake Booster Upgrade Kit for Datsun 240Z 1969-'72 New Version – JDM CAR PARTS they do still sell a 8.5" brake booster that uses factor that its a bolt on with 'no siginificant modifications' . Sounds like it may require the 70/71 Z's master mounting holes be be drilled out a bit like so many other kits. I will run the vacuum checks on my check valve this week to see if it in fact malfunctioning. I replaced it a while back with a new one when I installed a refurbished brake booster back in 2013 or so.

I have loved and enjoyed my Z since 2008. It has been a loyal friend to me over many many many miles. The other day I was driving her round and the brake pedal was starting to feel a bit hard. I mean hard in a way where no matter how hard you mash the pedal, the braking force does not increase. I find this entirely unacceptable. I am currently 100% stock. I have refurbished front calipers and OEM stock (but not original) rear wheel cylinders/drums. I think the time has come for me to take a serous look at my brakes. The time for another Zedyone Build thread is YEARS overdue and this is something I have always wanted to do. My options include: 1) Complete overhaul: Front redo/rear disk/larger master 2) Just do rear disk conversion (probably end up doing CV conversion as well from u-joints) I worry about needing a larger master to handle rear disk brakes. I have looked at Wilwood conversions and some from silvermine, etc. All appear to be the same thing packaged a bit differently. But I do think the time for 4 wheel disk brakes has come. is there any advice from my Z buddies on this conversion. I want to entirely rejuvenate my braking power.

Update: My new alternator came in and when I tested the voltage regulator cap the leads that go to the diode read OL in one direction and when I switched the leads it read 0.597 V. That is what a diode should do. Low and behold the alternator is now outputting voltage. :) Problem solved. Now I have a spare alternator :)

time flies guys. My new alternator comes in Monday. I will try just adding the regulator cap to see if that fixes things before I swap out the alternator. I have high hopes

Love this discussion. I am learning a LOT. As a mechanical engineer, I do not look at wiring diagrams hardly ever. So this is a great review of circuits. Z cars have so much to teach!

So, while the failure seems possibly diagnosed, lets talk about why. What makes the alternator stop charging if that diode burns out. I have been looking a LOT at a 72 wiring diagram (I do not have a nice color 71 Z wiring diagram). I am trying to find something that looks like a feedback loop with a sense input, internal regulation and finally, output happens. I assumed the white wire with the red stripe coming out of the back of the alternator was the output voltage back to the fusebox and battery respectively. Is the T connector used in the feedback loop which tells the alternator to 'activate'

I already have another MSA alternator kit coming from MSA as we speak. It will be here in a few days. When I was just SURE it was the alternator I ordered one. But now it may look like I have a spare. It will come with the bypass clip for the Voltage regulator and I will swap it out then. If I had a spare diode laying around I could just solder up one with clips, but I am pretty sure I do not have one.

Okay, I went into the electrical lab at work and borrowed a Fluke. with the Multimeter on Ohms, with the leads going red to black (left to right) on the two pins with the diode the Resistance is 23M Ohms with the leads going black to red (left to right) on the two pins with the diode the Resistance is 1 M Ohms I then switched the Multimeter to Diode Tester. Red to black or black to red the Multimeter read OL.

copy, that, I just read my new multimeter has a diode testor function. I will give it a go when I get home. Great Advice as usual SteveJ!

okay, there is a diode in there, now I need to see what it would mean if the diode was in fact bad, and what that failure would manifest it self as

interesting find. I checked the voltage regulator cap that you must install when you use an internally regulated Alternator. The 4 pins resistance was as follows. The two pins OL had a very dark patch on the back. I need to find out if there is a diode in there.