Since I've got the bug down I thought I'd try modifying a pertronix SVDA canister to be able to also boost retard. I've had it apart before to change the sensitivity of the vacuum advance so I figured it should be easy.
I just separated the base from the canister, slipped in a bit of spring, and tested it with a pressure gauge. I'm getting full actuation of the arm at 6psi. No idea how much actual retard this is going to equate to but it's easily better than a locked out or limited distributor. Here are a couple pics:
Turned svda into vac advance/boost retard
-
Coyotemutt
- Posts: 137
- Joined: Thu Jul 30, 2020 9:18 pm
Turned svda into vac advance/boost retard
You do not have the required permissions to view the files attached to this post.
-
Coyotemutt
- Posts: 137
- Joined: Thu Jul 30, 2020 9:18 pm
Re: Turned svda into vac advance/boost retard
Hah! It adds as much as ten degrees with a strong vacuum and retards 8! I'll set my max at 28* and I'm all set. :thumsup:
-
V8Nate
- Posts: 841
- Joined: Mon Sep 03, 2018 12:34 pm
Re: Turned svda into vac advance/boost retard
Perfect! I used a vacuum can from a saab dizzy on my amr500 build I never did measure the amount of retard though.lol
-
Coyotemutt
- Posts: 137
- Joined: Thu Jul 30, 2020 9:18 pm
Re: Turned svda into vac advance/boost retard
I'm probably getting more retard than I need early on, but better more than not enough. I know I'll be about where I need it at 10psi at least. Right at 20 degrees.