Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 07-23-2020, 10:11 PM   #1
JR48
Senior Member
 
JR48's Avatar
 
Join Date: Apr 2013
Location: Auckland
Posts: 111
Default Stromberg 97 Issue

This afternoon Flathead Ted came over to check out the Cabriolet, now nearing completion. I fired it up and suddenly it's running rough and gas starts streaming out over the garage floor! Quickly I turned it off, averting total disaster. Undoing the main inlet we discovered an S-Jet inlet valve rather than the regular needle and seat. The carb is a new Stromberg 97, should I look further for any other carb issues, replace the S-Jet with the older style inlet or is there something else I should be looking at. It's made me very nervous around starting the car up! I've attached an image of the car, it's present condition is due in part to the many Fordbarners who have helped me over the years with my questions and requests.
Attached Images
File Type: jpg 34Fordside.jpg (40.6 KB, 266 views)
JR48 is offline   Reply With Quote
Old 07-23-2020, 10:27 PM   #2
38bill
Senior Member
 
38bill's Avatar
 
Join Date: Apr 2014
Location: Minnesota
Posts: 851
Default Re: Stromberg 97 Issue

The S-Jet is supposed to be superior to the std needle and seat. Needless to say I had one stick on my new style 97's. Cleaned it out and it hasn't given me any trouble since. Is the float brass or black plastic?
38bill is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 07-23-2020, 11:31 PM   #3
petehoovie
Senior Member
 
petehoovie's Avatar
 
Join Date: May 2015
Posts: 2,950
Default Re: Stromberg 97 Issue

Quote:
Originally Posted by JR48 View Post
I've attached an image of the car, it's present condition is due in part to the many Fordbarners who have helped me over the years with my questions and requests.
__________________
The only thing nice about being imperfect is the joy it brings to others....

"Silver rings, your butt! Them's washers!"
"We shot our way out of that town for a dollar's worth of steel holes." - from 'The Wild Bunch' - 1969

https://www.youtube.com/watch?v=7NReUd2_0u0
petehoovie is offline   Reply With Quote
Old 07-23-2020, 11:32 PM   #4
petehoovie
Senior Member
 
petehoovie's Avatar
 
Join Date: May 2015
Posts: 2,950
Default Re: Stromberg 97 Issue

Quote:
Originally Posted by 38bill View Post
The S-Jet is supposed to be superior to the std needle and seat. Needless to say I had one stick on my new style 97's. Cleaned it out and it hasn't given me any trouble since. Is the float brass or black plastic?

GENUINE STROMBERG FUEL INLET S-JET 97 CARBURETOR
__________________
The only thing nice about being imperfect is the joy it brings to others....

"Silver rings, your butt! Them's washers!"
"We shot our way out of that town for a dollar's worth of steel holes." - from 'The Wild Bunch' - 1969

https://www.youtube.com/watch?v=7NReUd2_0u0
petehoovie is offline   Reply With Quote
Old 07-24-2020, 12:02 AM   #5
Brian
Senior Member
 
Brian's Avatar
 
Join Date: May 2010
Location: Masterton, New Zealand
Posts: 2,823
Default Re: Stromberg 97 Issue

i dunno about S-jets, however, it is a well known fact that Strombergs are sensitive to too much fuel pressure. What pressure is the pump developing?
__________________
Unfortunately, two half wits don't make a whole wit!
Brian is offline   Reply With Quote
Old 07-24-2020, 12:07 AM   #6
JR48
Senior Member
 
JR48's Avatar
 
Join Date: Apr 2013
Location: Auckland
Posts: 111
Default Re: Stromberg 97 Issue

Sponsored Links (Register now to hide all advertisements)
Hello Brian, How would I determine the pressure that the fuel pump is producing?
JR48 is offline   Reply With Quote
Old 07-24-2020, 12:53 AM   #7
Brian
Senior Member
 
Brian's Avatar
 
Join Date: May 2010
Location: Masterton, New Zealand
Posts: 2,823
Default Re: Stromberg 97 Issue

Run the outlet of the pump into a pressure gauge. ie remove fuel line between pump and carb, make up a line that will screw into the outlet of the pump, with other end attached to the gauge. Crank engine over, or run it with whats in the carb bowl, and observe the gauge reading
__________________
Unfortunately, two half wits don't make a whole wit!

Last edited by Brian; 07-24-2020 at 12:58 AM.
Brian is offline   Reply With Quote
Old 07-24-2020, 04:23 AM   #8
JWL
Senior Member
 
Join Date: May 2010
Location: Fitzgerald, Georgia
Posts: 2,034
Default Re: Stromberg 97 Issue

The "S" Jet is very close in tolerances and will not handle much debris before sticking. Although they have their shortcomings they will withstand more fuel pressure than the old needle. In testing I have used 7 lbs. without problematic leakage. I suggest plenty of cleanliness and filtering prior to sending fuel through the "S" Jet.
JWL is offline   Reply With Quote
Old 07-24-2020, 06:04 AM   #9
Bored&Stroked
Senior Member
 
Bored&Stroked's Avatar
 
Join Date: Jan 2011
Location: Central Ohio
Posts: 2,730
Default Re: Stromberg 97 Issue

Do you have a filter on the incoming line (like one in the glass fuel bowl - if you have a glass fuel bowl) - or one on the out-bound side of the pump? You probably have either debris in the jet itself, or too high of fuel pressure.

I typically run about 2 lbs of fuel pressure with Strombergs (with the older style needle type). I've not done a pressure test like JWL with the S-Jet . . . though my guess is that you'll have issues with 7 lbs of fuel pressure - though there is no way to know unless you put in a pressure gauge. You may need to have your pump reworked - as many of the new replacements have much higher pressures than the originals, or you may want to consider a high-quality low-pressure regulator (which is what I'd do).

PS: Don't go for one of those super-cheap chrome regulators with the rotating top piece - they are junk. I'd use a Holley 12-804 regulator - which you can get at Speedway and plenty of other places. And make sure you have a gauge on the outbound side of it - liquid filled, designed for vibration.
Bored&Stroked is offline   Reply With Quote
Old 07-24-2020, 09:21 AM   #10
koates
Senior Member
 
Join Date: May 2010
Location: Melbourne Australia.
Posts: 1,603
Default Re: Stromberg 97 Issue

Hi there, I have used a couple of the new strombergs and they work perfectly, but you must use a good in line filter ahead of the fuel pump and carb. Have you run the engine before or is this the first start ? I would bet some muck has got into the S-Jet and kept it open. Are those 1933 headlghts on your 1934 cabriolet ? They look longer than 34 headlights. Nice car. Regards, Kevin.
koates is offline   Reply With Quote
Old 07-24-2020, 10:15 AM   #11
38bill
Senior Member
 
38bill's Avatar
 
Join Date: Apr 2014
Location: Minnesota
Posts: 851
Default Re: Stromberg 97 Issue

I asked about the floats as the early units used a plastic float and they had problems with them. My 97's had plastic floats and when I had my S-Jet stick Stromberg sent me brass replacements. I am also running a Holley 12-804 fuel pressure regulator.
38bill is offline   Reply With Quote
Old 07-24-2020, 04:17 PM   #12
JR48
Senior Member
 
JR48's Avatar
 
Join Date: Apr 2013
Location: Auckland
Posts: 111
Default Re: Stromberg 97 Issue

Thanks guys, I've taken note of all your suggestions and will post any results. I have a filter between tank and carb sitting inside the chassis at the back. The engine is reconditioned and has only just been started, the carb was new out of the box. Yes the headlights are 33! They were my best pair and I quite like them! That is. until I find a better set of 34s!
JR48 is offline   Reply With Quote
Old 07-24-2020, 04:40 PM   #13
FlatheadTed
Senior Member
 
FlatheadTed's Avatar
 
Join Date: May 2010
Location: Auckland
Posts: 4,281
Send a message via AIM to FlatheadTed
Default Re: Stromberg 97 Issue

Its a nice car believe me its a credit to JRs perseverance ,he has his own good Mechanic but I could help if needed with the pressure tester,
__________________
http://www.flatheadted.com

Last edited by FlatheadTed; 07-24-2020 at 06:28 PM.
FlatheadTed is offline   Reply With Quote
Old 07-24-2020, 08:49 PM   #14
Pete
Senior Member
 
Pete's Avatar
 
Join Date: May 2010
Location: Wa.
Posts: 3,880
Default Re: Stromberg 97 Issue

JWL covered it.
I have tested and used the Neoprene or Viton tipped needles and they will also work fine at 7 or 8 lb. I have always run 6 lb on my Strombergs. With any needle setup, the bowls will run dry at 6000 rpm on the straight of a half mile circle track.
The original steel needles will work forever on the street as long as you keep the dirt out.
Pete is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 04:45 AM.