1974 D jet with new 123 Distributor a couple of questions |
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1974 D jet with new 123 Distributor a couple of questions |
Billy Bumpsteer |
Nov 4 2023, 12:06 PM
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#1
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Newbie Group: Members Posts: 14 Joined: 2-July 20 From: UK Member No.: 24,443 Region Association: England |
Completely standard 2.0 1974 car with D jet, I have just replaced the dizzy with 123 version 4RVIE, old dizzy was a 0231 174 005
Question 1, what is the best setting for the flip switch? Question 2, old dizzy had 2 vacuum hoses on it (one from top of throttle butterfly, one from below), 123 dizzy has only 1 port, what do I do? TIA |
914_teener |
Nov 4 2023, 01:39 PM
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#2
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914 Guru Group: Members Posts: 5,204 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
Completely standard 2.0 1974 car with D jet, I have just replaced the dizzy with 123 version 4RVIE, old dizzy was a 0231 174 005 Question 1, what is the best setting for the flip switch? Question 2, old dizzy had 2 vacuum hoses on it (one from top of throttle butterfly, one from below), 123 dizzy has only 1 port, what do I do? TIA In my opinion the 73 2.0 setting. Use the vaccum advance port on the dizzy to PORTED vaccum port on the TB if you have a port on the TB. If you don't try and find a 2 liter TB that does. Forget the timing retard port...just plug it at the source. Set the static timing and set the dizzy up per the instructions. Your'e done. Edit: To know which is ported vaccum and which is manifold vaccum...the ported vaccum for advance is on the atmosphere side of the TB plate. |
Billy Bumpsteer |
Nov 4 2023, 02:21 PM
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#3
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Newbie Group: Members Posts: 14 Joined: 2-July 20 From: UK Member No.: 24,443 Region Association: England |
Great, thanks for the answer, I will plug the hoses as I normally wait for 15 minutes before I drive off anyway
Anyone have a switch setting the can advise me to use? |
emerygt350 |
Nov 4 2023, 02:29 PM
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#4
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Advanced Member Group: Members Posts: 2,132 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
You want the port closest to the dizzy attached to the dizzy port. It has nothing to do with warming up the motor. That is for efficient running at cruise. Plug the port facing the back of the car, that was for the retard.
Setting wise, choose the 73 2.0 with advance. |
emerygt350 |
Nov 4 2023, 02:34 PM
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#5
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Advanced Member Group: Members Posts: 2,132 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
I believe that is setting 1 but you need to double check the manual.
https://123ignition.com/product/porsche-4-r-v-ie/ |
emerygt350 |
Nov 4 2023, 02:35 PM
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#6
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Advanced Member Group: Members Posts: 2,132 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
It isn't the end of the world if you plug both, but there are all kinds of good reasons to have the advance.
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914_teener |
Nov 4 2023, 02:41 PM
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#7
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914 Guru Group: Members Posts: 5,204 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
https://123ignitionusa.com/porsche-with-d-j...ncludes-spacer/
Your answer is in the chart down lower on the page. |
Billy Bumpsteer |
Nov 4 2023, 04:34 PM
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#8
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Newbie Group: Members Posts: 14 Joined: 2-July 20 From: UK Member No.: 24,443 Region Association: England |
So is it 9 or 0
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914_teener |
Nov 4 2023, 05:16 PM
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#9
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914 Guru Group: Members Posts: 5,204 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
So is it 9 or 0 I believe the asterisk indicates using retard or manifold vaccum on the TB thus a different curve. I'd run ported advance or 0 for a two liter. I ran that for a stock 2 liter car without issues. I ran it with advance ported vaccum. Per the instructions.....you need to set the static timing first and you will add the static timing degree (BTDC) to the degree value on the chart. Download the manual but I believe that's what the asterisk means. Edit: If the car wont' run very well with the timing set at spec static timing....you have a vaccum leak or the idle and air mixture needs to be adjusted to get it to idle at the chart RPM or spec RPM. You need a degreeable timing light and a tach or you'll have to stare through the back window to know what the RPM are. |
Billy Bumpsteer |
Nov 5 2023, 08:00 AM
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#10
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Newbie Group: Members Posts: 14 Joined: 2-July 20 From: UK Member No.: 24,443 Region Association: England |
Quick up!
Timing checked and dizzy set to position 0 Car start so strongly now! No bucking or jumping between 2 -3K, feels like a different car, must have found 25% more power 123 distributors do what everyone says they do |
emerygt350 |
Nov 5 2023, 02:39 PM
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#11
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Advanced Member Group: Members Posts: 2,132 Joined: 20-July 21 From: Upstate, NY Member No.: 25,740 Region Association: North East States |
Yeah, they are pretty awesome. Well worth every penny.
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