Freestyle 144 vs 148? That big a difference?

[retroicon]

I've never run a 148, but is there really that big a difference between a 144mm, and a 148mm pump in terms of performance? We're talking about just a little over a tenth of an inch in diameter, which doesn't sound like much, but I know that translates to about 1,000 mm squared of total area. I'm not sure of the average length of a yamaha pump, and I guess it varies with setback, or non-setback, but I'd have to guess we're not talking about more than a tenth of a litre of total volume difference between a 144 and a 148.

So, is there really that much of a difference if we're comparing mag to mag? I know a stock 144 vs a mag 148 is a whole different world, but that's more due to the mag... right? Or not?

 

[CARBONX2]

Part of the gain comes from opening the intake gullet. Most people will run a 144 with standard intake gullet, when they run a 148 they will open the gullet up. I opened my intake gullet up a while after I fitted a 146 and felt a noticeable difference on hookup/thrust.

 

[Philip Clemmons]

The short answer is yes, but a lot depends on your setup. It can be a significant change in most cases, IF you need it. We have had great luck with 144s up to almost 1000 CCs when dialed in properly. That said, there are times when you simply need more pump.

 

[js/sj]

Well said right there ^^ seen a lot of guys with up to 1100 with a 144 Solas adequately pushing them if propped right

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[Pablo]

Yeah, u can get by with a 144 up to 1L but that the far reaches of that pump. The small 4mm diameter increase means greater increases in the ability of the pump to move more water...given that r^4 factor.

 

[DirtKurt]

So if the 144 can work well up to 1l, How about the opposite? Im going to be running a Maxx 150 on a ported 780 w total loss and b-pipe. Am I working against myself or will it be more efficient. (assuming I get it propped correctly)

 

[SuperDrifter]

so in DirtKurt case, would this work well, by using a lower pitch number to compensate?

 

[Pablo]

Not speaking from experience but it can work. It's a rare combo so it may take some time to tune. I imagine the prop pitch will be quite low. U may want to call one of the pump companies...skat/Impros/Solas and talk it up before u buy.

 

[DirtKurt]

Little late for that, Bought the pump as a package. I'll be starting with a 10/15 and adjusting from there if nescessary

 

[retroicon]

So the real answer is, it's more the prop than the displacement in the case of a pump. A 148 can outperform a 144 if they're both propped properly, but you're not going to see that much improvement unless the pump is truly needed?

Here's the reason I'm asking.

I have a house on a lake, but I'm also not too far from Daytona/Sebastian and all the other east FL surf spots. I'm trying to build a compromise ski. Something that'll do a single flatwater flip, handle its own in the surf, and still be able to cruise around when my wife is out there on the waverunner or whatever.

If I go with a 144 with a solas type mag, I'm saving about $1200 over going with a true 148 mag. I'm going to keep this under 1,000cc, pump gas, no total loss. I'm just trying to figure out whether or not the extra $1200 is necessary, or if I'm going to be able to get nearly similar performance out of a 144.

 

[js/sj]

Get 144, prop properly then spend money on gas and get time into riding

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[Pablo]

So the real answer is, it's more the prop than the displacement in the case of a pump. A 148 can outperform a 144 if they're both propped properly, but you're not going to see that much improvement unless the pump is truly needed?

Here's the reason I'm asking.

I have a house on a lake, but I'm also not too far from Daytona/Sebastian and all the other east FL surf spots. I'm trying to build a compromise ski. Something that'll do a single flatwater flip, handle its own in the surf, and still be able to cruise around when my wife is out there on the waverunner or whatever.

If I go with a 144 with a solas type mag, I'm saving about $1200 over going with a true 148 mag. I'm going to keep this under 1,000cc, pump gas, no total loss. I'm just trying to figure out whether or not the extra $1200 is necessary, or if I'm going to be able to get nearly similar performance out of a 144.

144 mag all they way. I've never touched a Solas and other than hearing the headaches about bearings burning up I suppose they're ok. Skat is the gold standard. Mines 3+ years old on same bearings. Hope to get another season out of it before rebuild. If ur less than a 1L motor and don't ever plan to have a monster motor maxed out to the limit then why go for a pump that only shines when its pushed hard to move volume. The 144 has been there and done that on virtually all displacements south of 1100cc. Prop pitch and spacing, redux nozzle and steering nozzle diameter are all parts of a properly tuned pump. Save the dough. Buy a good, proven product and listen to the pros for advice. I'm no pump guru but I try to listen to what skat/Impros and builders tell me rather than "trying" to figure it out on my own. I promise a 144 would fit the bill. If u want to spend the coin then go for it. The 148 won't let u down either but it won't work any better for an all around boat than a 144 set up correctly.

 

[Christian_83]

Dirtkurt, isn't it a 155mm pump? on another note i think you will be over propped. JM is running a 155mag in his Circus, with his own 4mm stroker.I will be running a OEM 155mm pump with a DASA 850 SS PV, MSD TL, dual 49 FS and PFP. and way lower pitch than you.

 

[DirtKurt]

No its a 150, Its the same housing as as maxx148 but bored to 150. It uses the same reduction/trim setup as a 148. What are you goin to be running for pitch?