acme prop 4 SN92

I am also thinking of an acme four blade prop. From what I have been told, You will loose about one m.p.h. on top end, have more out of the hole thrust, and a smaller wake.

Slicer

Munday, if you wrote to Acme you can expect a response from Bill Weeks. He really knows his stuff. I corresponded with him for a while about my prop selection. On his recommendation, I went with a 3-blade. For whatever reason, Acme's website is not up to date. A better reference is Delta Propellor. They give better pricing than Acme will directly (they protect their distributors). Make sure you use the PlanetNautique discount code (PNACME06, I believe) for 5% off. I got my prop for $304 shipped.

As far as performance goes, I am very happy with mine. I got the #470, which is a 12.5"x15" 3-blade. Coming from an OJ 4-blade, I picked up some smoothness and about 200 RPM. Holeshot is stronger as well, and you can really feel the prop bite in corners- even hard ones. FYI, Bill said the #470 would outperform the #422 (12.5"x15.5" 4-blade) on our boats. The props would be comparable out of the hole, but the 470 would have ~1 MPH advantage in top speed and would produce a better ski wake. Both props have the same amount of surface area, which is impressive for the 3-blade... its truly massive looking!

My motor is stock (for now) with the exception of a DUI distributor. I turn ~4600+ RPM, so if you have a ProBoss motor you may be pushing close to 5k RPM with this prop due to the lower pitch. I think thats perfectly fine with the 351w though, as I have some upgrades planned that should put me in that range as well.

A must-have upgrade in my opinion!

There is a 4 blade prop called ambush on ebay .13 16 rh
1 inch $20.00 item # 4643716794
it's called an ambush .Run 1 time

I just switched from a 13x13 OJ Legend 3 blade to a 13x12 Acme 3 blade. Big improvement. Much less vibration, much better out of the hole, same top end. Well worth spending the money.

Just like 79 said Tim,I put a long bolt in end of cam for leverage work it in nice and easy.I have always used comp cams I'm sure others are just as good.I always degree them to check manufacturs accuracy but have never found a comp cam off more than half a degree.My boat had over 900 hours on it,I didn't figure out it was the cam giving me trouble till this spring,so I just fed her a new cam but a rebuild is surely in her future.Also comp sent a sheet talking about how oil these days has been robbed of much of its high load additives I was running mobile 1 which I have for along time now I'm running mystic with lucas added myself,no diary pics yet I'll take some shots this weekend.Cya guys be safe this weekend and every other for that matter.....

Munday gone to lake cyaaaaaa

Original topic was about props...sorry.

A bit less than a year ago, ACME recommended the #422 for my '93 SN (which I am runnign with satisfactory results). I was told that a suitable 3-blade (ACME) was not available for my boat. Maybe things have changed since then.

Just a few quick comments before I run back to the lake:

Munday and '79, thanks for the info on the cam. A full rebuild is in the motor's future, but probably several (~5) years away. It has 1160 hrs on it, but it runs way too good to tear it down now. In the meantime, Im adding heads and an intake. While its torn down that far, do you think its worthwhile to put in a cam? I know it would make the most out of the better flowing parts. I knew I would need new lifters- any other parts that should be done at the same time?

My dad and I went out yesterday to set my speedos. Afterwards, I did a few quick runs against his '03 196 with the 330 Excalibur (and stock Acme #422 4-blade). The boats were dead even out of the hole, though he walked away at 35+ MPH and had a good 4 MPH more top end. I have to say that this #470 prop is great.

79, thats what I was thinking. I will look into a new cam and lifters.

What jet size would be ideal considering these mods? Im not sure what I have on there now.

you'll need a number set of drills to figure out what jet size is currently in it now, Don't trust the number stamped on the jet. It took me three or four different tries before I was happy. It all depends on your skill level and knowing when the carb's to rich off idle. You cannot tell if the jets are to large at idle. So I would change the heads and do the up grades, adjust the idle mixture screws and get everything running good before you try missing with the jets. Running it lean for a short period of time isn't going to hurt the engine just don't spend the day on the water doing your normal gig until you get it jetted right or you will burn a valve and/or piston then your back to square one.