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Tuning With An Air/Fuel Gauge


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Well regardless if they flow the same, that's pretty annoying. The color may not matter, but on my engine, I would want everything to at least match.

So I have no idea if the size of the opening on the bottom is the only thing that would affect the flow rate. I kinda doubt it. I suspect there are other internal geometry areas which could affect the flow rate too. In other words... Just because the hole in the bottom is the same, I wouldn't assume they flow the same.

You could test them to compare the rates:
P1100285.JPG

P1100300.JPG

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2 hours ago, Captain Obvious said:

Well regardless if they flow the same, that's pretty annoying. The color may not matter, but on my engine, I would want everything to at least match.

So I have no idea if the size of the opening on the bottom is the only thing that would affect the flow rate. I kinda doubt it. I suspect there are other internal geometry areas which could affect the flow rate too. In other words... Just because the hole in the bottom is the same, I wouldn't assume they flow the same.

You could test them to compare the rates:
P1100285.JPG

P1100300.JPG

Good point about them matching regardless of flow rate.  I just took a look at the bottoms to compare what was on there (left) and the Bosch ones I bought (right) and they look way different.  Are the ones that were on there for the turbo or just some weird reproduction maybe?

IMG_7615.JPG

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Effective fuel hole diameter  in carbs and fuel pressure determine fuel flow. I think it is the same for injectors.

Fuel pressure in injectors is relative to manifold air pressure rather than absolute air pressure otherwise  a negative pressure in the manifold would combine to  "suck extra fuel".

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  • 3 weeks later...

And here is the end of the post-credits scene for this feature-length thread: after 3 separate mismatched injector shipments from rockauto, I finally got 6 matching ones and sent the rest back.

Took the car out today for the first time and interestingly enough, with the new reman injectors, I needed to richen the car a bit to get it to our numbers.  I expected the old injectors to have had a diminished fuel output due to age but who knows.

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11 hours ago, chaseincats said:

after 3 separate mismatched injector shipments from rockauto, I finally got 6 matching ones and sent the rest back.

Woof. I suspect those old injectors had been knocking around in boxes for so long, they probably started consolidating them and mixed them up.

Glad to hear you're back on the money!       :beer:

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