Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Technical BBS > 1- Porsche Technical Forums > Porsche 356 Technical Forum

Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
Registered User
 
Join Date: May 2008
Posts: 14
Garage
1962 Super 90 Unable to idle

I have a friend who has a beautiful Super 90 with idling problems. We have gotten it closer by setting the timing and points as well as synchronizing/setting the solex carburetors, but we are still left with the following symptoms:

Hard Starting. When cold, the engine has to be cranked at least several times to get going, even when it had been running the day before so that the float chambers should be mostly full. After a week of sitting, it seems he has to crank it about 20 times, to the point that his gel battery is almost dead before it starts.

Dropping off at idle. I can get it to idle satisfactorily at 1,000 RPM for about 30 seconds, maybe a minute, but then there will be a slight carb backfire and the RPM's will slowly drop lower until the car dies in about 10-15 seconds. This can be averted by running up the RPM's and then starting the process over again.

With the above in mind, I thought it might be a fuel delivery problem. We disconnected the fuel line and the fuel pump pressure measured 1.3 PSI when cranked for about 20 seconds. We got good flow, but could not get the pressure any higher.

I think the pressure is supposed to be 2.4, but I did not know if this was being measured with the engine running.

Any ideas much appreciated!
Old 06-02-2017, 05:19 AM
  Pelican Parts Technical Article Directory    Reply With Quote #1 (permalink)
Registered User
 
id10t's Avatar
 
Join Date: Mar 2003
Posts: 7,303
Rebuilding the fuel pump is trivial (at least it was on my '65 C) so you may want to do that. Or, run an alternate fuel source using a gravity feed to brign the pressure up for testing purposes.
Old 06-02-2017, 06:12 AM
  Pelican Parts Technical Article Directory    Reply With Quote #2 (permalink)
Registered User
 
Join Date: May 2008
Posts: 14
Garage
Thanks, we will give it a try! Is there any particular height above the carbs to hold the fuel supply in order to duplicate the 2.4 psi, or does that matter?
Old 06-04-2017, 02:16 PM
  Pelican Parts Technical Article Directory    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Feb 2005
Location: Mexico
Posts: 1,553
An approximate height to hold the fuel supply to duplicate a static fuel pressure of 2.4 psi would be about 90 inches.
Old 06-12-2017, 03:01 PM
  Pelican Parts Technical Article Directory    Reply With Quote #4 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 03:21 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2016 Pelican Parts - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.