|
Sponsored Links (Register now to hide all advertisements) |
|
|
Thread Tools | Display Modes |
11-09-2019, 10:57 AM | #1 |
Member
Join Date: Oct 2019
Location: Warsaw, MO
Posts: 52
|
Thanks for the advice, still need more
Thanks to everyone that replied to my previous posts. It made the intake manifold/carb and head install much easier. I'm ready to move on with more mods and am looking for more advice.
1. The Mallory dual point I have, ZC275AX, has a provision for vacuum advance. Should I use this feature or block it off and go centrifugal only? 2. Has anyone used the Mac's spin on filter conversion? Any problems? 3. The car ('49 sedan) currently has dual exhaust using the stock exhaust manifolds. Would like to upgrade with something that would not require any fitting or grinding. |
11-09-2019, 12:59 PM | #2 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,752
|
Re: Thanks for the advice, still need more
1, By all means. Hook it to manifold vacuum.
2, Not used one. 3, Again, no experience on that model. |
Sponsored Links (Register now to hide all advertisements) |
|
11-09-2019, 01:18 PM | #3 |
BANNED
Join Date: Jun 2010
Location: Utica, Ohio
Posts: 522
|
Re: Thanks for the advice, still need more
Use the stock filter as it does a better job of filtering.
|
11-09-2019, 02:30 PM | #4 |
Member
Join Date: Oct 2019
Location: Warsaw, MO
Posts: 52
|
Re: Thanks for the advice, still need more
Manifold or venturi? The manifold vacuum on the engine is 20.5"hg at idle. I think that would pull it to full advance. The Holley 390 that I'm using has a port for metered venturi vacuum that is zero at idle and increases to 10" at 1500 rpm. |
11-09-2019, 02:50 PM | #5 |
Senior Member
Join Date: May 2010
Location: Solihull, England.
Posts: 8,752
|
Re: Thanks for the advice, still need more
Dunno. I'd use manifold, but maybe someone else can say if venturi would be better.
|
11-09-2019, 03:57 PM | #6 |
Senior Member
Join Date: Apr 2015
Location: Sweden
Posts: 3,045
|
Re: Thanks for the advice, still need more
Sponsored Links (Register now to hide all advertisements)
Taking vacuum from intake and having venturi controlling the valve... |
11-09-2019, 04:53 PM | #7 |
Senior Member
Join Date: Dec 2013
Location: Minnesota, Florida Keys
Posts: 10,317
|
Re: Thanks for the advice, still need more
All of the Mallory distributors with vacuum I have seen have a "vacuum brake" like the pre-'49 Ford distributors. (Actually, it should be called a "vacuum unbrake, but that's kind of awkward). As such, I believe that it should be hooked up to manifold vacuum rather than venturi vacuum. I would try it both ways. I had a vacuum over mechanical converted SBC distributor on my '51 and couldn't get it to work right. I changed in a mechanical only Mallory flattop and am much happier with the way the car runs.
|
11-10-2019, 02:39 AM | #8 |
Senior Member
Join Date: Apr 2015
Location: Sweden
Posts: 3,045
|
Re: Thanks for the advice, still need more
This is the little gadget i thought of..
https://www.ebay.com/itm/Vintage-Mal...4AAOSwteRdseDd Think this was an option either to correct or improve the spark advance... |
|
|
Sponsored Links (Register now to hide all advertisements) |
|