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duffymahoney

Duffy's 1/71 Series 1 240z build

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2 minutes ago, Captain Obvious said:

Nice. I'm not a fan of most painted valve covers, but I gotta admit... I like that one.

Thanks! I will retain my stock one raw. Then vapor blast one. Then red. See which I like the best. 

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Well got a ton done and really drove it!

I removed the dealer AC unit.  I will be modifying a  aluminum 280zx mount to use a sanden pump later on.  My giant ac pump makes it impossible to get to so many things.  It had to go.  

New fujitsubo (just came out) exhaust is in.  Sounds great.  My motor is bone stock, so it doesn't sound super beefy, below 2-3k rpms it almost sounds like any other car.  But get on it and it opens up.  I will try to post a sound clip soon.

I was able to use my extra series 1 heat shield, just a few bends and it fits great.  The ztheraphy carbs were easy to install and tune.  My old ones are all gummed up and I couldn't adjust mixture.  My flow meter died, so I still would like to re-tune and mess with timing more. 

My biggest issue came when I went to start it.  I didn't mark on my old dist cap which was #1.  Installed wires on the cap in stock location and nothing happened, it wouldn't try, etc....  I had so many new things new so I started with the carbs.  Checked fuel, checked, ignition wiring (petronixs 1.5ohm coil, nos ballast and electronic points).  Still nothing.  I then found TDC and low and behold my dizzy is 2 cylinders off speared into the oil pump.  Moved wires (#1 is where 4 should be now) and it fired right up! So now at some point I need to pull the oil pump and fix.  

 

First time really driving it.  Some harder pulls, some turns etc..  Even stock motor it's a blast to drive.  Sort of scary, lots of road noise, but it was awesome!  Not a lot of gas fumes, smells, which i am happy about.  Engine bay puts off a ton of heat even with the ceramic coating on the header.  

 

Next is Sanden pump install, along with a new dryer, lines and evap.  Also I am binding mass loaded vinyl to the bottom of my new carpets for some sound damping.  

 

Oil pressure is reading low, I really hope it's the sending unit.  Motor has good compression (I need to re test, I got a new gauge) and doesn't burn any oil I can see.  

 

 

 

 

 

 

 

 

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Edited by duffymahoney
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Having some running issues. My vacuum advance wasn’t operating correctly. 

Took it apart and cleaned it and the breaker plate. It didn’t move freely at all. It’s now moving nicely and lightly greased, vacuum holds fine  so it’s good. 

So It was affecting me tuning my carbs. 

Then my stupid flow meter broke.  I need to send it back. But I also bought a unisync. 

I am running lean. White spark plugs and intake backfire. 

I decided to do a compression test  numbers aren’t as close as I would like  

Compression

1-155

2-160

3-162

4-164

5-158

6-153

 

 

 

 

 

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Next is a leak down. I am at worst 8% off on my compression.  So for now that is fine, I’m sure the valves need adjusting.

I also bought a colortune spark plug (clear spark plug to see combustion color)

 

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Work looks great and I'm no engine expert, but I wouldn't be too concerned with that range on the compression results. Certainly nothing that you would need to address in any hurry.

I do have a question about your alternator output though. That looks like a lot of charging... Does it make sense for your alternator to be pumping out 35A under whatever the drive conditions were at the time? Seems like a lot to me.

On ‎5‎/‎13‎/‎2018 at 11:26 AM, duffymahoney said:

 

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2 minutes ago, Captain Obvious said:

Work looks great and I'm no engine expert, but I wouldn't be too concerned with that range on the compression results. Certainly nothing that you would need to address in any hurry.

I do have a question about your alternator output though. That looks like a lot of charging... Does it make sense for your alternator to be pumping out 35A under whatever the drive conditions were at the time? Seems like a lot to me.

 Honestly don’t know! Seems odd for sure. This was cruising at 35 mph. Head lights were on. It’s the stock alternator 

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Well the headlights should be drawing less than 10A total (probably around 8-ish), and all the running lights should be at less than that. I'm thinking you should have been around 15A plus whatever the battery was pulling. Maybe the battery was pulling a bunch? I'm thinking maybe the batter was partially discharged since it's not getting a lot of running time?

You running the heater fan and defroster too maybe?

Just seems odd to me... Most times I don't see an alternator needle swung that far over. Now of course, I've got the voltmeter on my later 280, so what do I know?

What say you 240 guys? Does it seem odd to see the alternator needle swung over that far?

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Yes, it is unusual. The typical suspects are a battery going bad and loads added to the wrong side (battery side) of the ammeter.

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1 hour ago, SteveJ said:

Yes, it is unusual. The typical suspects are a battery going bad and loads added to the wrong side (battery side) of the ammeter.

This was after a full day of trying to start it.  So battery was most like dead.  Well hopefully.  I will check next time I try and run it.

 

I found my carbs were empty of oil.  I don't know why I assumed that the past owner shipped them with oil.  So that is my next step.

 

I will also make sure that TDC is 0 on my crank pulley.  Then work my way forward from that.  But I assume the carbs being out of oil is what was causing my tuning to be so incorrect.  Thanks! 

Edited by duffymahoney

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Well the headlights should be drawing less than 10A total (probably around 8-ish), and all the running lights should be at less than that. I'm thinking you should have been around 15A plus whatever the battery was pulling. Maybe the battery was pulling a bunch? I'm thinking maybe the batter was partially discharged since it's not getting a lot of running time?
You running the heater fan and defroster too maybe?
Just seems odd to me... Most times I don't see an alternator needle swung that far over. Now of course, I've got the voltmeter on my later 280, so what do I know?
What say you 240 guys? Does it seem odd to see the alternator needle swung over that far?


Seems to me there is a big difference between a Volt meter reading and an amp meter reading on an early Z that is using a voltage regular.
My 240 commonly will kick up high on the scale and then will settle back down to a level more consistent to what I have turned on. I run a stock 71 alternator and regulator, relays to headlights and cooling fans and a gel battery.

I would put a full charge on the battery and the watch it on a long run of 10 miles or more while turning on different accessories.

Nice looking engine bay.


Sent from my iPhone using Classic Zcar Club mobile

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I thought that the very high current was the reason it's not recommended to jump start a car with a completely dead battery.  The abnormally high current and subsequent heat can damage the alternator.  Not uncommon to lose an alternator after jump-starting a very dead battery.  Makes for some of those odd coincidental failure charging system stories.

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I thought your compression numbers looked good, well below 10%...

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Ok ran into tons of issues!

 

First was my vacuum advance was frozen.  So I took that apart and cleaned the crap out of it.  It's now greased and moves nicely. 

 

My biggest issue was the dizzy counter weights have these pins that slide into slots on the ears.  Well for some reason the previous owner thought it was smart to not have that hooked up correctly.  So everytime you stepped on the gas the timing would retard a lot!! Thus causing so many terrible issues.  It's now fixed and working like it should! The engine sounds night and day different!

 

Also go all my carpets bound to mass loaded vinyl.  The interior is night and day more quiet.  

 

 

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Aren't PO's wonderful?!!?

So any pics of the MLV bonding process? Is that something you did, or did you send the carpets out to have it done?

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1 hour ago, Captain Obvious said:

Aren't PO's wonderful?!!?

So any pics of the MLV bonding process? Is that something you did, or did you send the carpets out to have it done?

I could pull it up. But super easy. It’s just cut back 1/2” from the edge and sewn on the bottom. It keeps the carpets from moving as well. 

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I got my AC system basically back in.  Sanden 508 compressor mated to a 83 280zx compressor bracket.  Took some machined parts and adjustments, but the bracket works well and tucks awesome against the motor.  Also re-zinc'd the pulley and bolts.  Half of the hoses are new.  Four Seasons 33280 Filter Drier is a perfect match for my dealer installed ac, I powder coated the bracket and also got stainless hose hangers. The dryer is the exact diameter and the same hose barbs!  I was going to run r12, but the compressor is setup for 134A.  So without changing the oil in the compressor and potentially harming it, I might as well run the gas it's setup for.  Only issue is the evaporator might not be good enough for the newer gas heat exchange.  But time will tell.  

 

Belt is Napa 25 7325 which is a 10mm wide x 840mm belt.  Fits perfectly.  

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Edited by duffymahoney

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So working on my air cleaner. I want to powder coat it. I ordered every single orange I could find from prismatic powders.  Like 30 shades.  

Hemi orange is almost correct or flag orange. Both are super close. Hemi matches the older paint, then flag is closer on the inside areas, I will go with flag.  

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It's easy to get yourself into a tailspin with a handful of paint samples. I think either of those would work out just fine.

I suspect the original paints have all darkened a little over time, so picking the slightly lighter of the two is probably perfect.

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12 hours ago, Captain Obvious said:

It's easy to get yourself into a tailspin with a handful of paint samples. I think either of those would work out just fine.

I suspect the original paints have all darkened a little over time, so picking the slightly lighter of the two is probably perfect.

I believe I will pick flag orange.  It matches other inside areas better.  

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I did all of mine in Chevy Orange......Flag Orange looks great!

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Edited by Diseazd

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I very carefully masked them off......BTW...Your car looks terrific......nice job!!

Edited by Diseazd

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