What RPM's are you getting with your 422?

I'm only seeing 4450 with two people and half tank of gas. That's with the factory tach and PP. I'm not a speed demon and am fine with how things run but I know 4600+ should be more realistic/ideal. Makes me wonder what I'm leaving on the table at slalom speeds and starts? Maybe back down in pitch? What is below a 422.... 654 iirc?

654 is the next one down in pitch. The motor would probably be a bit happier with a few hundred more RPM. I have an 1868 that's the next one down from that, good holeshot prop.

FWIW, I've spun my reworked 422 to 5400 before in my Sport at 50.9mph, but they don't plant the bow like a SN so it's kind of apples to oranges. 351 Pro Boss carb.

Oh yeah, 351 HO carb'd as well. I can barely touch 47.

According to the phone, 46 flirt 47. And that's two tachs, both reading within 50 RPM's of the other. No paddle wheel on PP.

93 SN HO, GT40p heads, running on LPG. 4400@43.1

My 95 Ski Nautique with a Acme 224 will spin above 5,000. Most days 5,100 or 5,200 a few times it has hit 5,300+.   MPH before prop repair was just over 50, after the prop repair due to damage the MPH is 47 but it is smooth and pulls hard.

damn i missing out 97 sport gt40 422 42.5 mph @ 4700ish rpm

The 224 is a 13" dia compared to the 422 12.5" plus has slightly less cup .090 compared to .105 on the 422. Would love to give one a try myself but I feel the performance differences would be fairly small..... but hey if a trash my 422 again a think I will go for a new prop and the 224 would be on the short list

My 89 2001 with a 422 spins 4850 at 44 mph
The factory OJ 14x16 spins 4700 but pushes the boat to 47-48mph. 422s got a meaner holeshot to

yupper

throttle out wrote: My 89 2001 with a 422 spins 4850 at 44 mph The factory OJ 14x16 spins 4700 but pushes the boat to 47-48mph. 422s got a meaner holeshot to

Something is wrong with that 422. New or rebuilt?

I have never seen a move from that oj to an acme result in a 3-4mph loss in speed.

Are those numbers all correct (GPS) and taken under the same conditions (air/water temp, altitude, water/wind conditions, boat loading, etc)?

On my '98 Sport I got 4,940 rpm @ 45.4 mph with the 422. I've switched back to running my 1442, the better holeshot seems to help us older guys with our skinny skis. I preferred the lower rpm at all speeds of the 422 but not that big a difference, kind of forget how the other prop performed after you run one for a few outings.

I don't know how the planted bow (like Halfnelly mentioned) of the '93 Ski affects WOT rpm. The 351 HO gives up I think 25 HP to the GT-40, or maybe it's a bit more in 1993, can't remember. I'd guess that HP difference comes into play almost all at the top end so maybe a 351 HO with a 422 should top out in the 4,500 rpm range and not higher. I can't imagine you getting more than 47 mph out of that setup, would have guessed more like 43-44 mph.