1128 Series Month

[Keith Gandy]

Not a clue, and if I tuned them I would go more by ear than RPMs anyway.

Mike u tune for just cleaned up in whatever wood u cut?

 

[paragonbuilder]

I drill the main jet to a #70 on ever 1128 carb I fondle.

I could swear I asked you if you do anything to them a while back cuz mine was acting up and I thought I might need to replace it, and you said you didn't touch them???
How long have you been doing this?
Or maybe I'm mistaken... I can't find that pm...


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[mdavlee]

Did not, but they all idled well, responded well, 4 stroked out of the cut and cleaned up in the cut, so they were close enough.

Usually about one turn out on the low and 1+1/8 out on the Hi works well for this series after mods.

That said, everyone should, and should know how, to check by ear.

Without retuning and checking the RPM it's hard to get any results that make sense. I know when I swapped the 461 carb onto my 046 I lost rpm and the cut times slowed down even tuning it back to the same rpm.

 

[Deets066]

Yeah when looking for results that mean anything. You need consistent wood, cants work best. And a tach to tune them to the same rpm.

 

[Mastermind]

I could swear I asked you if you do anything to them a while back cuz mine was acting up and I thought I might need to replace it, and you said you didn't touch them???
How long have you been doing this?
Or maybe I'm mistaken... I can't find that pm...


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Many 1128 carbs already have a jet that is that size Dan. The 461 carb uses a smaller jet than a 046 carb.

The reason I drill the jet isn't to gain performance really. It keeps the HS screw from being too far off the seat.

Remember that there are two paths to the main nozzle. One thru the fixed jet, and one via the adjustment screw.

 

[hseII]

Many 1128 carbs already have a jet that is that size Dan. The 461 carb uses a smaller jet than a 046 carb.

The reason I drill the jet isn't to gain performance really. It keeps the HS screw from being too far off the seat.

Remember that there are two paths to the main nozzle. One thru the fixed jet, and one via the adjustment screw.

Via Omaha.

 

[huskihl]

Yeah when looking for results that mean anything. You need consistent wood, cants work best. And a tach to tune them to the same rpm.

That doesn't always work either. If a carb with a 17mm venturi quits 4 stroking at 15k and a carb with a 19mm venturi quits 4 stroking at 16k, you'd be drowning the larger one by tuning them both to 14,5k.

I'd find where each quits 4 stroking and then back each one down 200 or 500 or xxx rpm to get the best results

 

[paragonbuilder]

Many 1128 carbs already have a jet that is that size Dan. The 461 carb uses a smaller jet than a 046 carb.

The reason I drill the jet isn't to gain performance really. It keeps the HS screw from being too far off the seat.

Remember that there are two paths to the main nozzle. One thru the fixed jet, and one via the adjustment screw.

Gotcha!


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[twinstaged]

Wide band, head temp and dyno with correction factor. Measuring awfully small things for a butt dyno...just my opinion after over a decade on a dyno helping test road race spec junk for consistent .5 and 1 hp gains that you can't really feel and only maybe see when your side by side with the same speced car on a straight. Just depends how crazy you want to get on a worksaw lol I mean *s-word they all cut wood pretty fast.

 

[big t double]

Via Omaha.

Uneasy rider. Charlie Daniels. Correct?

 

[Mastermind]

Wide band, head temp and dyno with correction factor. Measuring awfully small things for a butt dyno...just my opinion after over a decade on a dyno helping test road race spec junk for consistent .5 and 1 hp gains that you can't really feel and only maybe see when your side by side with the same speced car on a straight. Just depends how crazy you want to get on a worksaw lol I mean *s-word they all cut wood pretty fast.

Bam.......there it is. Relying on cut times to tell us about small changes is never gonna do much more than confuse us.

 

[Brush Ape]

Many 1128 carbs already have a jet that is that size Dan. The 461 carb uses a smaller jet than a 046 carb.

The reason I drill the jet isn't to gain performance really. It keeps the HS screw from being too far off the seat.

Remember that there are two paths to the main nozzle. One thru the fixed jet, and one via the adjustment screw.

Did you measure all those sentences or something? Dunno my OCD must be flaring up.

 

[hseII]

Uneasy rider. Charlie Daniels. Correct?

You're Damn Skippy.

 

[Deets066]

That doesn't always work either. If a carb with a 17mm venturi quits 4 stroking at 15k and a carb with a 19mm venturi quits 4 stroking at 16k, you'd be drowning the larger one by tuning them both to 14,5k.

I'd find where each quits 4 stroking and then back each one down 200 or 500 or xxx rpm to get the best results

All these are the same Venturi. But I get what your saying.

Either way they each needed to be tuned

 

[hseII]

Did you measure all those sentences or something? Dunno my OCD must be flaring up.

No he just held his right calf up as a gauge: same length.

 

[huskihl]

All these are the same Venturi. But I get what your saying.

Either way they each needed to be tuned

Serious question...take 2 carbs with the same size venturi, same size on each end, but one has performance work done to it. Will the max rpm tune be the same on each?

 

[Deets066]

Serious question...take 2 carbs with the same size venturi, same size on each end, but one has performance work done to it. Will the max rpm tune be the same on each?

It's possible

 

[Deets066]

All these are the same Venturi. But I get what your saying.

Either way they each needed to be tuned

When I say tuned, that could be for max rpm for each carb or tune them all the same.

Either way they should be tuned and not just bolt them on and go. This stuff takes serious time to do. I usually don't take the time to make the tests as they should be either

 

[huskihl]

It's possible

Never done it. I'm getting a few spare carbs in the bin but not many for 1128. I'd imagine that a single carb could be a runner, much like a unicorn.

 

[paragonbuilder]

Serious question...take 2 carbs with the same size venturi, same size on each end, but one has performance work done to it. Will the max rpm tune be the same on each?

I'm guessing yes if it's just fuel mods. It can get only so much airflow through for max speed, but the fuel curve can be changed to provide more fuel where you need it.

If you are modding for airflow, like thinning shafts, removing choke and whatnot then all bets are off.




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