When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Hi, I have not had cause to post since I swapped my front springs for stock height ones in my Mustang 2 type front end. The difference has been incredible. The truck now rides along pretty damn smooth for a nearly seventy year old !. Just lately though an annoying thing happens regularly. When I pull up at a junction, or pull up sharply nine times out of ten the engine will cut out. It starts again instantly I turn the key. The idle speed seems OK, but I could turn it up a bit. Could it be anything else ?.
What is your idle speed set at? Tho the book says 450, I find 600 - 650 works out much better. Your carb(s) could have high float levels and are dumping fuel in when it sloshes on a hard stop, too.
Hi Ross, hope you are well. I have no rev counter but think it a lot slower than 650 rpm. I was also going to check if the secondary is on a progressive movement. Which carb is the primary and which the secondary ? Is it a job for a novice to check float levels ?
Is there a throttle stop screw on both carbs, or only the front one? You appear to have both carbs as primary, i.e., both operating all the time, not a progressive system.
I'm not super familiar with Strombergs (which you appear to have), but I doubt it's rocket science to pull the upper bowl covers off. May be a little more complicated with them in place. These guys are on your side of the pond and have the parts you might need for a rebuild, may also have a manual:
Thanks Ross, yes deal with this company already. I think the Stromberg 97's were only fitted in recent years. I checked the throttle movement and both carbs open together. Is there any real advantage in have a progressive linkage. I guess their is a fuel saving, but I probably don't do enough miles to worry to much about that. Would love to know if anyone has thoughts on that please. BTW' I have raised the tick over speed a little to see if that rectifies the problem.
Progressive linkage isn't common on 2x2 setups, more complication for small benefit. At idle they are both functioning anyway. Is there any identifying casting number on your manifold? Some "Super" manifolds are made such that progressive linkage won't work at all, because each carb only feeds 4 cylinders. Yours doesn't appear to be a Super, but would be good to verify.
Did a little reading about the Strombergs and it sounds like they are very easy to adjust float level with the carb in place, just removing the upper bowl cover.
Do you have a fuel pressure regulator? What model fuel pump?
Hi Ross, just as suspected, probably not worth even looking into. The pump is a Facet "Red Top" from memory. And yes when I changed to the Red Top I set the pressure regulator at about 3 psi from memory. I will look and see if the inlet manifold has any identifying markings, cant say that I have never noticed any though. Tomorrow I will take the truck out for a runaround, and see if upping the tick over has done the trick or not.
