datsunfreak Posted December 7, 2021 Report Share Posted December 7, 2021 12 hours ago, EDM620 said: I'm really seriously rethinking the 720 dash/HVAC as a result. The fan is definitely bigger & moves more air, plus has 4 speeds. So I have jumped on refurbishing the 620 system, and will find a way to get more fan speed, possibly make some ductwork to move air to the end vents. Use the blower and resistor from the 720? FWIW, I know some people who have replaced the stock squirrel cage fan with a PC fan, since they are compact, move a lot of air, and are usually 12V. This on a rheostat could provide a wide variety of fan speeds? 1 Quote Link to comment
Stoffregen Motorsports Posted December 7, 2021 Report Share Posted December 7, 2021 Seriously? I wouldn't think that fan would move enough for HVAC. Quote Link to comment
datsunfreak Posted December 7, 2021 Report Share Posted December 7, 2021 24 minutes ago, Stoffregen Motorsports said: I wouldn't think that fan would move enough for HVAC. AC, probably not. Heat, maybe? You raise an interesting point though. Stock fan seems to be maybe 200cfm (when it was new, not now), and a strong PC fan looks to be around 100-150cfm. I actually looked at using something like this (no water involved), but they draw about 18 amps at full blast... Quote Link to comment
datsunfreak Posted December 7, 2021 Report Share Posted December 7, 2021 There's also stand-alone options? https://www.summitracing.com/parts/vta-50515-vuh After giving up on an all electric system, I think I am buying one of those. Quote Link to comment
Stoffregen Motorsports Posted December 8, 2021 Report Share Posted December 8, 2021 I have been using the vintage air stuff lately on my resto-mod builds, and while the quality isn't as good as OEM, they are compact. This is partly due to the modern high efficiency cores available now. But yeah, if the vintage air system fits, use that instead. Any fan would work for heat, but for defrost, you need to move a bit more air. Quote Link to comment
EDM620 Posted December 13, 2021 Author Report Share Posted December 13, 2021 Over the weekend I jumped onto the task of refurbing the heater assembly and investigated a replacement core. As I ultimately wanted to increase the airflow, I made the assumption based purely on # of fan speeds, that the 720 blower motor spins faster, coupled with a bigger hamster cage fan. As this whole project seems to be going, nothing is ever a simple swap, and this includes the motors and fans. The larger fan was just a few mm too big for the housing and the motor mounting was different. At least the shaft was the same diameter and length so I could just use the original fan, however the little coiled wire heater block had to be changed, and the "newer" motor features a tube that direct vents back into the housing (???). I cleaned the housing thoroughly, modified the motor mount to fit properly, created a vent connection where the old single coil heater block was, and mounted up the larger 3 coil heater block. The stuck flow control valve was freed up and flaps for air control were cleaned with new foam applied. Everything works like new and won't smell like old dirt or dead mouse. The heater core itself was a different issue, as the original is NLA as many others have found, I did some research on Spectra Premium website for alternatives Products (spectrapremium.com). As I found researching for my radiator replacement, there are hundreds of different heater cores - making the task of finding a suitable replacement a hit & miss search that was ultimately a miss, either the inlet/outlet were not in the right place or the dimensions were off. After that I decided to have another look at my core and it was in pretty decent shape, mostly just fins were clogged with mouse nest. A thorough cleaning and new foam wrap and I'm calling it good. When/if it does leak, I'll dive deeper into the world of replacement core swap. Last thing on this is I decided to make a screen to keep leaves & other debris out of the blower assembly. I'll finish that today. 3 Quote Link to comment
datsunfreak Posted December 13, 2021 Report Share Posted December 13, 2021 2 hours ago, EDM620 said: the "newer" motor features a tube that direct vents back into the housing (???). i believe that is to keep the motor from overheating when running at full blast. It uses the air rushing past to suck air out of the motor housing. Really common on newer stuff, never used on older stuff (slower spinning motor doesn't overheat?). Quote Link to comment
EDM620 Posted December 13, 2021 Author Report Share Posted December 13, 2021 1 hour ago, datsunfreak said: believe that is to keep the motor from overheating when running at full blast That does make sense. Quote Link to comment
EDM620 Posted December 13, 2021 Author Report Share Posted December 13, 2021 The air intake grille is made & in place - should keep more crap outta the blower. 4 Quote Link to comment
Stoffregen Motorsports Posted December 14, 2021 Report Share Posted December 14, 2021 13 hours ago, EDM620 said: Over the weekend I jumped onto the task of refurbing the heater assembly and investigated a replacement core. As I ultimately wanted to increase the airflow, I made the assumption based purely on # of fan speeds, that the 720 blower motor spins faster, coupled with a bigger hamster cage fan. As this whole project seems to be going, nothing is ever a simple swap, and this includes the motors and fans. The larger fan was just a few mm too big for the housing and the motor mounting was different. At least the shaft was the same diameter and length so I could just use the original fan, however the little coiled wire heater block had to be changed, and the "newer" motor features a tube that direct vents back into the housing (???). I cleaned the housing thoroughly, modified the motor mount to fit properly, created a vent connection where the old single coil heater block was, and mounted up the larger 3 coil heater block. The stuck flow control valve was freed up and flaps for air control were cleaned with new foam applied. Everything works like new and won't smell like old dirt or dead mouse. The heater core itself was a different issue, as the original is NLA as many others have found, I did some research on Spectra Premium website for alternatives Products (spectrapremium.com). As I found researching for my radiator replacement, there are hundreds of different heater cores - making the task of finding a suitable replacement a hit & miss search that was ultimately a miss, either the inlet/outlet were not in the right place or the dimensions were off. After that I decided to have another look at my core and it was in pretty decent shape, mostly just fins were clogged with mouse nest. A thorough cleaning and new foam wrap and I'm calling it good. When/if it does leak, I'll dive deeper into the world of replacement core swap. Last thing on this is I decided to make a screen to keep leaves & other debris out of the blower assembly. I'll finish that today. All of my builds here get the HVAC thoroughly cleaned to get rid of the mouse and cigarette smells. New foam on all the doors and joints too. I buy the foam in bulk rolls. Nice work. 3 Quote Link to comment
EDM620 Posted December 16, 2021 Author Report Share Posted December 16, 2021 I'm going to have another look at the screen, as a friend pointed out this will reduce the airflow which is opposite of what I'm after. The screen I used looks to give a fair reduction to the intake flow. If possible, I'll try to dome it up into the cowl area to further prevent leaves etc. from covering it. Stoffregen, the Sprite you're planning to build reminds me of a conversion done on a buddy's Midget, we swapped in an A14 and a hand-built (crude work but way back in time) fuel injection using a Bosch system out of a Rabbit. Car was lighter and much more nimble with the British boat anchor gone. We retained the British clutch master which didn't function quite right when mated to the Datsun clutch slave, and were going to solve that but life intervened... Have a few friends who played with Series 1 LR's too. 1 Quote Link to comment
Stoffregen Motorsports Posted December 16, 2021 Report Share Posted December 16, 2021 Life is too short to get caught up in one make or model of vehicle. I have varied tastes when it comes to old cars and trucks. You should see the Jeep Cherokee Chief Sport I just picked up! Super clean and V8 rumble. Quote Link to comment
EDM620 Posted December 16, 2021 Author Report Share Posted December 16, 2021 2 hours ago, Stoffregen Motorsports said: I have varied tastes when it comes to old cars and trucks. That sounds amazingly similar! I swapping a 360 into my 304 "75 CJ5 that I pulled outta full size Cherokee. That Jeep was one hell of a beast off roads, kitted out perfectly. Had full 1/2T rating instead of regular 1/4T. Honestly out of the mix I've ha, I miss that one the most. Most common place to find a Land Rover - on the rope of my CJ 🤪 They never got out without a face fulla mud 2 1 Quote Link to comment
EDM620 Posted December 16, 2021 Author Report Share Posted December 16, 2021 Heck I just did a count and I'm on my 21st vehicle. 1 Quote Link to comment
Stoffregen Motorsports Posted December 16, 2021 Report Share Posted December 16, 2021 Nice. The 360 in my Cherokee runs perfect. I just re-sealed it and gave it a new paint job, but when I pulled the heads off, the bores looked perfect and the oil pressure was awesome, so I just left the bottom end alone. It's my first AMC V8, but they appear to be built tough with good materials. I've owned about that many 510s. Right now I have 9 trucks, half of them duallies. Quote Link to comment
EDM620 Posted December 18, 2021 Author Report Share Posted December 18, 2021 On 12/16/2021 at 2:01 PM, Stoffregen Motorsports said: appear to be built tough with good materials The AMC blocks were not given the due they deserved, the bottom end was really stout and read often that the mains were strong enough that were equivalent to bow-tie 4 bolt mains. 1 Quote Link to comment
Stoffregen Motorsports Posted December 18, 2021 Report Share Posted December 18, 2021 It's pretty common for lower volume manufacturers to make a stronger design and execute it better. Maybe it has something to do with pride, but I suspect it is because they don't have enough experience to know which corners to cut. Quote Link to comment
EDM620 Posted December 19, 2021 Author Report Share Posted December 19, 2021 10 hours ago, Stoffregen Motorsports said: make a stronger design and execute it better. The only real difference between the 360 and the 304 blocks is a taller deck height for the increased stroke. Are you going to feature that build on Ratsun as well? 1 Quote Link to comment
Stoffregen Motorsports Posted December 19, 2021 Report Share Posted December 19, 2021 I could share some pics, but I plan on starting a thread for it on Expedition Portal forum. I took it for its first drive yesterday. Rock hard tires and clapped out suspension, but the drivetrain is smooth as silk. 1 Quote Link to comment
datsunfreak Posted December 21, 2021 Report Share Posted December 21, 2021 On 12/18/2021 at 11:06 AM, Stoffregen Motorsports said: It's pretty common for lower volume manufacturers to make a stronger design... I suspect it is because they don't have enough experience to know which corners to cut. This. 😁 One of their biggest issues was just not knowing where to spend money. Over-engineer the engine to last forever, but short cut other things that reduce consumer confidence in the product. GM seems to do this with cheap interior plastics that always feel crap, even on a $70k Cadillac... 1 Quote Link to comment
datzenmike Posted December 21, 2021 Report Share Posted December 21, 2021 Drove a '14 Shelby 500 Mustang and chrome and plastic... I thought I was in a casino. 1 Quote Link to comment
Stoffregen Motorsports Posted December 21, 2021 Report Share Posted December 21, 2021 4 hours ago, datzenmike said: Drove a '14 Shelby 500 Mustang and chrome and plastic... I thought I was in a casino. I've often felt that about Ford products. Puffy red leather chairs in a bright shiny interior screams slot machines. 1 Quote Link to comment
datsunfreak Posted December 21, 2021 Report Share Posted December 21, 2021 31 minutes ago, Stoffregen Motorsports said: I've often felt that about Ford products. Puffy red leather chairs in a bright shiny interior screams slot machines. I think some of us like stripped down race cars too much... 😄 2 Quote Link to comment
Stoffregen Motorsports Posted December 22, 2021 Report Share Posted December 22, 2021 Un-carpeted floors and rear seat replaced with an aluminum bulkhead is fine with me. 1 Quote Link to comment
Lockleaf Posted December 22, 2021 Report Share Posted December 22, 2021 I owned a 1969 Wagoneer with the Buick 350 in for a while. I loved that thing, but unfortunately had to sell it to pay for a semester of college. A worthwhile investment for me, but still, this is one of the vehicles I regret selling the most. Interior was in awesome condition. Black vinyl with just a few split seams that I hand stitched back together. You could steer that thing with a pinky the steering was so easy to move. I'm a fan of FSJ, even if I'm building an International now. 1 Quote Link to comment
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