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Mainland China Govt's big plan.... the drug dealer methodology.... get the world addicted to low cost junk and corner the supply.... our local Govt's are the pushers and we are the addicts. I could see this coming since the 90's with the WTO entry and all the cheap and dangerous kids toys and telescopes flooding the market place.... just like the illegal invasion of Iraq in 2003, you could see it well before the train wreck happened.... it is still sad times when the Russians can take down a jet, Saudi's can take out a Journalist and no one blinks but rather changes the channel to the Kardashians.

With some Z's approaching over $100,000USD worldwide, prices are going crazy. Good and bad for all of us.

Beautiful!

I saw this many times too.

My error. Excellent sites and content none the less. Alan your genius comes to light on the GTR site! Nice stuff!

Here is Dan's excellent post. Make one and put it on Ebay lol easy $1k!!!

Good news! It was the op-amp Hitachi FA-6007T that died. I'm not sure if there are any other Hitachi radios using this early bird? FYI a quick and dirty test of the audio section is to simply touch pin 1 and the radio should hum.

Yes. For higher compression engines, less maximum electrical timing is needed. For mechanical valve event timing, moving the cam timing (at sprocket) to #1 position may help breathing and give you more WOT HP. ?

Well the 2SB337 power transistors work fine. I swapped modules and the problem did not move. Next will be the OP-Amp.

I was thinking it would be nice jewelry for #147 . I'll fab one like @dk240z did... ?

Did the Dyno use a wideband? It would be interesting to compare. I wonder where you can get 5 more HP?

Weird, I was just thinking of you and this earlier today. Must have been ths Z FORCE. 195RWHP is F'n AWESOME!!!!! For the high RPM scatter, usually a distributor refresh with lube can help the high end. Sometimes the spindle teeth meshing with the worm on crank snout cause timing variation at high rpms according to Frank Honsowetz. He recommends brass teeth. Also it could be poor electronic components in the Pertronix.

I thought this was yours: https://www.gtr.co.uk/forum/236658-1969-nissan-s20-twin-cam-engine-rebuild.html ?

Janet would have killed me anyway. Your turn: https://www.ebay.ca/itm/113812521729?ul_noapp=true

btw your UK website is great. It often comes up in searches and @HS30-H has posted superb information on that site for years. I love his S20 rebuild thread.

Thanks AK. I should be good but someone else reading the thread may wish to have them.

Thanks for the link. Fantastic work. Nice job!

Looks like @siteunseen's past car.

Thanks for the great advice and support! I still have a scope.(I used to have access to signal generators 30 years ago too). For this, I have just been lazy and have not pulled the scope out yet. I'm lucky and have another radio that works so I should be able to compare voltages and signals through the system. If I can find an FM to AM converter then I will have a 24/7 input source as there are no AM stations here anymore. ? I think I found a supplier for the very old Hitachi Op Amp but I will scope out rather than throw a grenade and replace. The voltages on the Darlington array match the schematic so I am hoping it is ok. Please post a link to your radio upgrade to this thread to help others!

Hi All, My early Hitachi radio functions nearly 100% except for the audio output stage. I get a speaker thump when turning on but no static or sound. The volume and tone controls make no changes to the silence. I just replaced all caps and no change. I found the cap C38, which decouples the power amp transistors from the speakers, to be toast and the PO seems to have hooked up two speakers to the output. I am now starting to investigate deeper. The voltages on the power transistors are normal however I am getting ~230ohms across the input winding of the audio transformer T7 feeding the power stage from the Hitachi FA-6007T op amp. I'll check against my working radio. Here are some pictures of cap replacement to help others. I also included the service manual (thanks to @hr369 and @JDMjunkies.ch) ? Sadly there are no AM radio stations in this area so trouble shooting RF stages will be is tough. Hopefully it is just a problem in the audio stage. Electrolytic Capacitors: Crusty C38 Cap hitachi_tm-1081-zb_all_transistor_auto_radio_1970_sm.pdf

Mainland Chinese quality parts inside? Glad you don't repair passenger jets or surgical equipment with that $^!#. Don't buy a Kia or Hyundai, they are from S Korea but loaded with those $^!# parts.... and if you are lucky, they will spontaneously combust.

Videos: Auto Tune Motor.mp4 buttons tune and light.mp4 buttons tune and light.mp4 backlight video.mp4 backlight video.mp4

Photos: Just cleaned with damp cloth. I did not do the following in case purchaser wishes to do so or if they wish me to do so: Silver paint can be touched up. Yellowed window can be cleaned clear. Replace blue spliced wire with fuse and choke Repair spliced 2nd speaker modification connection (black wire tail) It works 100%. Pots and switches were cleaned with Caig Deoxit and all moving parts cleaned and re-lubricated with correct silicon lube.

Altering the fuel level is another parameter for tuning a/f ratio.