impeller recommendation

[jharvey1984]

Hi all - I'm building my first AM ski and need some help on propping. The ski is an EME aerial 8. The hull came with a maxx 155 pump (kawi). The previous owner had a PHP 898 in it with a skat mag swirl 75mm hub thin blade cut back 7/16.

I will be running a big bore (760) 62t/61x. The cylinder work (big bore kit and "shredder" porting) was all done by Paul. I will also be running a 62t zeel with custom curve by paul along with a limited B pipe and 38cc domes. I don't have compression numbers yet (just got the engine assembled) but squish is about 40-45 thousandths.

Looking for a starting point on an impeller. Any help would be appreciated understanding I may have to make some tweaks. Thanks.

 

[Harbor]

5/10

 

[clouse22]

Hit up @JetManiac. He set me up with a prop for my 760 circus that was pretty spot on

 

[fastgtfairlane]

A buddy is running a skat 6/12 behind his jm 718 with all the bolt ons and oem 155 pump, bored nozzle in a tigercraft v3 glass hull and it feels great.

 

[JetManiac]

Hi all - I'm building my first AM ski and need some help on propping. The ski is an EME aerial 8. The hull came with a maxx 155 pump (kawi). The previous owner had a PHP 898 in it with a skat mag swirl 75mm hub thin blade cut back 7/16.

I will be running a big bore (760) 62t/61x. The cylinder work (big bore kit and "shredder" porting) was all done by Paul. I will also be running a 62t zeel with custom curve by paul along with a limited B pipe and 38cc domes. I don't have compression numbers yet (just got the engine assembled) but squish is about 40-45 thousandths.

Looking for a starting point on an impeller. Any help would be appreciated understanding I may have to make some tweaks. Thanks.

Start by asking your builder Paul for his recommendation.

 

[Jr.]

Thanks Chris, Your correct!
The 760 Shredder BB will pull a taller prop then most would believe.
especially with the new zeel and custom curves supplying the fire.
past builds like yours ran 7/14 or 16. The part of this Im not sure of and dont have a lot of experience with is the Maxx pump and how it builds pressure? You also didnt state exit nozzle dia? Start with the 7/16 you have and test?
chances are, some bends might be in order, however, you will be in the ballpark.
you have my number, feel free to call for input anytime!

P

 

[clouse22]

I’d start with the 6/12 with a 2mm prop spacer and a 90mm nozzle with stubby cone and I’d bet it would be damn close. I was running the pfp wet for exhaust and I’d think your bpipe would give you better low end punch

 

[jharvey1984]

thanks guys for the input especially Paul. I feel like I’ve bugged Paul plenty enough for the engine work that’s why I didn’t text you about the pump too lol. I’ll give what I got a shot and see how it performs. The steering nozzle is 89mm not sure about reduction nozzle but can measure tomorrow.

 

[jharvey1984]

Reduction nozzle is 87mm steering is 89mm.