 Do 911s have warm start issues? |
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| Joe Bob |
 Aug 29 2009, 08:00 PM
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#1
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Retired admin, banned a few times  Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None  |
(IMG:style_emoticons/default/bootyshake.gif) Yes, they do....ask me how I know......
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| 70Sixter |
Aug 30 2009, 02:07 PM
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Member Group: Members Posts: 422 Joined: 3-August 04 From: Surf City, NC Member No.: 2,444 Region Association: South East States |
My 914-6 does not warm start well. Webers boil over. Cold start is great.
My 70 911 was just the opposite. Easy start once warm. |
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| rfuerst911sc |
Aug 30 2009, 02:36 PM
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#3
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Advanced Member Group: Members Posts: 2,158 Joined: 4-May 06 From: Dahlonega , Georgia Member No.: 5,980 Region Association: South East States |
QUOTE(70Sixter @ Aug 30 2009, 12:07 PM)  My 914-6 does not warm start well. Webers boil over. Cold start is great. My 70 911 was just the opposite. Easy start once warm. Does your six have the insulator blocks under the intake manifolds? I have a 1983 911SC with 46mm PMO carburetors in the Florida heat and zero problems starting hot. Also the rest of the car has to be up to snuff....ignition,distributor,fuel pump,plugs and wires ect. |
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| 70Sixter |
Aug 30 2009, 03:38 PM
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#4
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Member Group: Members Posts: 422 Joined: 3-August 04 From: Surf City, NC Member No.: 2,444 Region Association: South East States |
QUOTE(rfuerst911sc @ Aug 30 2009, 04:36 PM) Does your six have the insulator blocks under the intake manifolds? I have a 1983 911SC with 46mm PMO carburetors in the Florida heat and zero problems starting hot. No, but I'm going to add them (under the carbs) after carb rebuild. But as I said, my 2.5 911S with Zeniths started great hot. I think it's a Weber thing, and the PMO insulators are my hoped for salvation. How many fuel pumps are running to feed those 46s? |
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| rfuerst911sc |
Aug 30 2009, 05:49 PM
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#5
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Advanced Member Group: Members Posts: 2,158 Joined: 4-May 06 From: Dahlonega , Georgia Member No.: 5,980 Region Association: South East States |
QUOTE(70Sixter @ Aug 30 2009, 01:38 PM) QUOTE(rfuerst911sc @ Aug 30 2009, 04:36 PM) Does your six have the insulator blocks under the intake manifolds? I have a 1983 911SC with 46mm PMO carburetors in the Florida heat and zero problems starting hot. No, but I'm going to add them (under the carbs) after carb rebuild. But as I said, my 2.5 911S with Zeniths started great hot. I think it's a Weber thing, and the PMO insulators are my hoped for salvation. How many fuel pumps are running to feed those 46s? The insulators go under the manifolds to keep the heat from transferring from the heads into the manifold which then transfers into the carb body. On my SC I am running the stock CIS fuel pump with a PMO pressure regulator. It has performed perfect for over 2 years. For my GT clone I am running 3.0 911 engine with 40mm Webers. I have the insulators installed on that setup also but car not running yet. Good luck with your hot start issue. (IMG:style_emoticons/default/beerchug.gif) |
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| Dave_Darling |
Aug 31 2009, 12:03 AM
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914 Idiot Group: Members Posts: 14,985 Joined: 9-January 03 From: Silicon Valley / Kailua-Kona Member No.: 121 Region Association: Northern California 
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I know that at least one SC (stock, with CIS) will occasionally have hot start problems in very very hot conditions.
--DD |
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| 70Sixter |
Aug 31 2009, 12:06 PM
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#7
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Member Group: Members Posts: 422 Joined: 3-August 04 From: Surf City, NC Member No.: 2,444 Region Association: South East States |
QUOTE(rfuerst911sc @ Aug 30 2009, 07:49 PM) The insulators go under the manifolds to keep the heat from transferring from the heads into the manifold which then transfers into the carb body. Thanks, I had it in my mind they went under the carbs. Just checked the PMO website, not too clear on accessories, but I didn't look too hard yet. |
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| Joe Bob |
Aug 31 2009, 06:56 PM
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#8
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
My SC...when it had a 3.0 and CIS had hot start issues, it was the 14 dollar check valve.
My current SC has a 3.6 and it's the stoopid solenoid just like my 914/6.... |
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| jt914-6 |
Aug 31 2009, 09:33 PM
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Driving & working on teeners 41 years Group: Members Posts: 1,786 Joined: 3-May 08 From: Bryant, Arkansas Member No.: 9,003 Region Association: South East States |
PMO makes a drill fixture that you place in the carbs and drill "vent" holes to help stop perculation in the float bowls. It seems to help.
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| pete-stevers |
Sep 1 2009, 01:12 PM
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saved from fire! Group: Members Posts: 2,641 Joined: 10-October 04 From: Abbotsford,BC, Canada Member No.: 2,914 Region Association: Pacific Northwest
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my 3.0 w cis has a hot start problem..would love to get that figured out
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| Joe Bob |
Sep 1 2009, 02:03 PM
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#11
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Retired admin, banned a few times Group: Members Posts: 17,427 Joined: 24-December 02 From: Boulder CO Member No.: 5 Region Association: None |
Check valve in the neck of the fuel pump....
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