Jet differences ?

Ok so i go to put jets back to an original tune up but along the way the original jets got mixed with some others of the same size so now the question is if you have two jets both size 60 and they havent been messed with could one flow enough different to cause a problem ? I know the size number to put back in but i do not know what they flowed ?

 

www.fuelinjectionenterprises.com Get them flowed so you know where you are.

 

check with a set of pin guages..dave

 

Doesn't that still leave some variables in the inlet-outlet chamfers or radii?

Maybe im just splitting hairs but IMO the only way to really know is to flow them.

 

A needle dial will get you close enough. Generally jets that have been flowed have the jet number and a "F" somewhere on the same side. Unless you were on the RAGGED edge I wouldn't think twice about it. In the off season you could see what jets you use and order flowed ones, you could always have yours flowed but by the time you ship them back and forth etc etc.... Call Spikey @ Gorr, he'll help you out.

Brandon Booher
NHRA TAD #34

 

Jets

I believe what brandon is saying is that its relevent to the size that you are running.Yes nicks will effect them but they would have to be major.Also we are not running hours to measure a pound of fuel ,and yes I have a flow bench for the last 30 years.

 

Yes Mike just saying they'll be close, I have seen people have two "35's" in their leanout(s) and one was actually a "135", the "1" was just not next to the "35". If it doesn't look right don't use it. The best bet would be to get a system flowed (I like Gorr) and get an amount of flowed jets relative to your combo. Make sure you take into account main, loop, leanouts, etc..; it truly is the best option. The dial gauges do ballpark you pretty well, but as Mike said each one CAN be different. I use the dial just to double check, I've found one flowed jet that was marked wrong and it's a good thing I checked. Good luck in your pursuit!

Brandon Booher
NHRA TAD #34

 

jets

Yes Mike a leakage tester does give a good comparison .I have made a simple regulator that can be used on the regular house water line just like aleakage tester but will give wet flow without going to the bench,sort of the poor mans flow bench think how to make one and save a lot of guessing.

 

Flowed jets and nozzles are a necessity if you are in the zone at all. If you run it on the fat side where you won't hurt it you can get away with it. We have jets that are re stamped 2 sizes from their original marked sizes. Physically protecting them in the holder and making sure they don't get damaged after that is important.
When you have them flowed, pick a vendor and stick with them because all benches are not the same.
just a suggestion
Cheers
Dale

 

i went through and flowed with a leakdown tester and got jets that flowed as close as possible to their size stamp they all seem to flow more than the size shows probably because of being flowed with just air but i duplicated to the best of ability the original tune up well see what it does ! its 500 degrese hear in the shade and i wouldnt even go if i werent first in points i would pull this stuff and have it flowed !