SRX buy or not? OMC

[bigboy]

Hi,

I currently own a family boat 17F6. Weighs about 1500 lbs key ready.
Motor is an evinrude V4 140 HP

Current props:

Stiletto 23P @ 5900RPM = 61mph
Raker 24P @ 6000RPM = 57mph

Propshaft 5,5 inch under the V. Motor is bonestock. I have a manual jackplate with 5,5 setback.

How will a SRX 23 perform on my boat?

I could close the 2 top holes of the LU and maybe run it higher?
Top end is important for me.

Would a Bob's true tracker foil be a good idea?

Movie with the stiletto: http://users.skynet.be/fa003940/fletcher.wmv

Pic @ speed:

http://users.skynet.be/fa003940/4.jpg

[Riverman]

An SRX has to be surfaced. You can get it up high enough by blocking the top two holes and opening the lower two into one.

[bigboy]

I'm wondering or this prop will perform better than the other ones. It's strange that the stiletto is faster.

[racer]

The picture appears to be a 140 looper, if so and it is an 85 it would have a v6 sized unit. 23 srx were common for the 4 lower make sure it is the right one for your unit.

[bigboy]

It's an 88. 140 V4 Looper;)

[zookimota]

I've run both Stiletto's and Raker's over the years on different V4's and also on Suzuki's. The Stiletto pitch number is an average of the pitches across the entire prop. They are a progressive pitched prop. The 23 number would be like a 25 or 26 Raker. They do not provide quite the bow lift of the raker, but almost always have better top end than most others with the same pitch number. Can't really explain it other than that, and experience.

[David]

I just bought a DAH worked 23 SRX for my Baja/100 Johnson. I have about 4" of setback with a manual plate.

I was going to just raise the motor notch by notch and watch the water pressure. Is this safe? Will I be able to get the motor high enough without blocking holes?

[bigboy]

I also go up with 1/2 inch till it drops. Watch the pressure also with more trim.

Close the two top holes and make one hole of the two lowest like rivermand said.

[Fulltilt]

Anyone have a general idea how much an SRX prop weighs for shipping purposes.

[jphii]

If you're gonna ship it to Belgium, get ready to get hosed. I checked once before and it was about $125.

[Fulltilt]

International shipping priority flat rate box under 20 Lbs. is listed as $37.00.

Over 20 Lbs is $85.00, a big jump.

DHL was $153.00

UPS was over $200.00

[bigboy]

A time ago there was a thread about shipping props to Norway.

There was somebody that had shipped a few props to Europe for 30$.

So:confused:

[Ron V]

I don't see the prop and packaging weighing more than 20 lbs, so shipping shouldn't be that big of a deal.

My personal opinion is that an overhub prop like a SRX is not the right prop for that boat. From the photo and your slip numbers, I think the Stiletto is darn close to the best you could expect. When that type of rig is running that clean and you have those slip numbers at that rpm, it's usually best to put the prop books away and just run it. I tried a 23" SRX on my Rapid Craft when I had the V-4 on it. My normal prop was a 19" SST II, which got on plane in ~2-3 seconds and topped out at 50 mph @ 5600 rpm. The 23" SRX could barely get on plane (they ventilate a lot coming out of the hole) and ran about 45 mph @ 5500 rpm (gives you an idea of the slippage difference). After LOWERING the motor over an inch, I finally got it to bite good enough to get on plane without blowing the rods out of the motor and this also brought the top speed back up to 50 mph, and the rpm stayed the same. The rig just wasn't fast or powerful enough to get away from itself and benefit from the SRX. Your rig might have better results since it has the 140, but keep in mind your hull is a family boat and has more deadrise in the back. I would expect that getting on plane with an overhub will be difficult. A hydrofoil might help...being that the boat is running 61 mph now, the SRX might work ok on top end. But in any case I don't see you ever needing or being able to raise the motor high enough to require mods to the water intakes. Most people don't realize just how high you can run a motor with stock intakes. You'd likely have to raise the motor another 2.5"+ from where it is now before you had water pressure problems. All you can do is try it and see. Been there and done that many times and every time I've come back to the engine height and prop that first put the rpm where it was supposed to be and carried the bow well. :rolleyes:

P.S. I run a 14.25" x 27" SRX now with the 150 Merc and it's my favorite. Faster than other props I've tried that cost twice as much. :)

[baja200merk]

on a heavier boat the small ears and its 14.25 dia makes it hard to get it out of the hole, esspecially jacked up. my 30 chopper comes out of the hole more then 2x as fast. find a chopper you need the bowlift the srx does not have. srx=little bow lift.

[bigboy]

Thx for the input.

I realy need a prop with tons of bowlift. The reason that the stiletto is faster is because it just lifts more. You can realy feel the bow coming up at the last 5mph.

I had a Laser 2 25P but problem was that it was a 15spline. Otherwise I guess this could have been THE prop for my boat.

Ps: On ebay there is just sold an srx for 50$ and been outbid:mad:

[baja200merk]

Thx for the input.

I realy need a prop with tons of bowlift. The reason that the stiletto is faster is because it just lifts more. You can realy feel the bow coming up at the last 5mph.

I had a Laser 2 25P but problem was that it was a 15spline. Otherwise I guess this could have been THE prop for my boat.

Ps: On ebay there is just sold an srx for 50$ and been outbid:mad:
forget the srx

try a chopper and a tempest plus for kicks.

[bigboy]

Srx = chopper. Or do you mean it's not a good chopper?

Tempest plus not available for V4:(

[Fulltilt]

My SRX is 13.5 x 23

[Ron V]

Srx = chopper. Or do you mean it's not a good chopper?(

The SRX is "like" a chopper, but I know that at least on the bigger ones, they have the basic round ear design but don't have the excess blade area. Not sure how the smaller ones compare in overall design and theory.

If you want the real scoop on the SRX, call John Janaky at DAH Pro-Pellers in Burlington, Wisconsin (USA). He has a website with contact info. He has the original pitch blocks for the SRX's and reworking them is what he is best known for (I believe his former partner designed the SRX). John gave me the rundown on the bigger SRX's when I took mine to him and explained why they are so successful with a 30+ year old design, but I never talked with him about small ones like the 23" you are looking at. I tried the 23" with my V-4 and like I said, it didn't work. I also tried a 15 spline 25" (also small diameter, and worked over with a lot of cup) with my 150 Merc on the same hull and it came out of the hole great, but was 5 mph slower on top end than a 25" Shooter!! But this is just my experience and every rig is different.

E-mail Janaky a photo and talk to him. He works on all kinds of props so he may have a different idea yet. Prop options for high performance are somewhat limited with a 13 spline V-4...believe me, I've been there and know.

[bigboy]

I've been looking at their website yeterday but cant find the emailadress:confused:

Maybe looked over it?

I've also been thinking about 4 blades. But like you say: 13spline = limited prop offer.

Thx anway!

[imq707s]

An SRX is OMC's version of a Merc "chopper". It's an over the hub type prop, not a thru-hub like the raker you have. I've ran both on my boat. For crusing around, a Raker is not all that bad. They seem to give more stern lift than the SRX...and give decent bow lift.

The SRX won't show it's stuff until you get going really fast.....I don't think it will work good unless it's on a lighter hull...and you surface it.

Here are some pics if you are intersted.

http://img152.imageshack.us/img152/3358/im003141suv8.jpg


This shows a SRX and a Chopper

http://img152.imageshack.us/img152/8407/srxvschoppergl5.jpg

[Ron V]

Good side-by-side photo there Ian. I've always thought that the chopper looked like a big ugly club off of a tugboat compared to the SRX.

[LSaupe]

With closing off the two upper holes, as a "ballpark" estimate how high can you typically go (with a 5.5" setback)? Would an "even" be typically obtainable or would it need to be lower? Obviously it would be trial and error but just trying to get a feel for what to expect. Puting a jackplate on a V-king with OMC and want prove out the engine before I invest in a nosecone w/LWP.

Larry S.

[Fulltilt]

I ran mine even with the bottom of the sponsons with the top two holes plugged without a problem. It was ran that way for a number of years. I did keep an eye on it.

Srx worked better for planing and turning at speed, on my hull, but it is a light hull and my Raker was a smaller pitch.


With closing off the two upper holes, as a "ballpark" estimate how high can you typically go (with a 5.5" setback)? Would an "even" be typically obtainable or would it need to be lower? Obviously it would be trial and error but just trying to get a feel for what to expect. Puting a jackplate on a V-king with OMC and want prove out the engine before I invest in a nosecone w/LWP.

Larry S.

[83PREDICTOR]

I had a 115 V4 Johnson on my 16.5ft Checkmate. With 5.5" setback I could run 2.5" below the pad with a bone stock lower unit with 19psi @ WOT. With that engine the fastest prop I tried was a 21P Ballistic belive it or not but I had to run it 4" below because it did not like to surface.

22P Raker- 52mph
20P Chopper-48mph
21P Ballistic- 54mph

I cat remember rpm's but all speeds are GPS #'s

But the best thing I ever did was get a V6 Merc

[bigboy]

I'm impressed about the performance of that ballistic:eek:

I think my propshaft is now 5,5 below the V and my speeds are also GPS measured.

[David]

My 16' Baja/100 V4 runs great with a light load and a 20 small ear chopper, but it runs out of revs. Not enough pitch.

I think the SRX props are more like the small ear choppers than the big ear choppers.

My fastest prop so far is my 21 Renegade. I'd try Renegades and Rakers for a V4 boat that needed bowlift.

[bigboy]

Stiletto is the way to go for an overhub:D

Cheaper and faster than a raker:p I would recommend it to everyone wth a heavier hull like mine.

A friend tried my stiletto on a light boat and the speeds were the same as the raker.


But for the SRX I have no idea. In Belgium is a chopper for sale for omc but 28Pitch:rolleyes:

[Ron V]

The guys on the saltwater fishing page seem to be big fans of Stilettos for their Boston Whalers and similar boats, and say they are faster than Rakers. It's hard to totally compare them since Rakers only come in even pitches and Stilettos come in odd pitches, but I did have a 18" Raker on my V-4. For all the hype surrounding them, I was not that impressed with the numbers it turned in. The numbers you got tell the same story...higher rpm and considerably less speed with a prop that has an inch more pitch? Either they have an odd way of measuring pitch or they just plain aren't that efficient, even though they are supposed to be.

[bigboy]

Everybody is claiming that a raker is such a good prop. But hey we are on sceam and fly. Most people that run a V4 run it on ultra light raceboats. For that application it could be that the raker is just better.... And for heavier boats like mine the stiletto is the prop we want.

I'm wondering which max rpm is the best? Omc writes 5500 in their book but most people just like to spin it @ 6000. Mabe i'll have to find a stiletto 25:D or change my ratio to 2:1....

My deadrise is 24°

[LSaupe]

Not to muddy the waters, but I am running a 4 blade Trophy and it works fabulously as a do-everything prop. Might be worth a look. I am not a prop guy by any measure, but overall do like it much better than the SRX I was using (primarily for the much improved hole shot and lower mid range response).

Larry S.

[bigboy]

Yep, also heard alot of good things about it but doenst fit an omc V4 ;)

[Ron V]

You mentioned changing your lower unit ratio to 2:1...I thought that was what all the small V-4 cases were?

There is a Flo-Torq II hub kit made by Mercury to fit the 4 1/4" V-4 cases, but Mercury lists it for Quicksilver props only...I wonder if it would fit a small hub Trophy. I had thought there were people running Trophy props on OMCs, but I could be wrong.

By the way, John Janaky's phone number is 262-534-4440. Not sure what the US country code is though.

[David]

of course the US country code is 1:)

[Riverman]

I bought a Stiletto for my daily driver, anything will be an improvement from the beat-up aluminum piece of crap that was on there. Lots of new things to try in the spring.

[bigboy]

I better called the thread: Big V4 prop topic:D

Ron V: I actualy have the same case as other V4's but you could choose for the 2,25 or 2 gears back in time. The 2,25 was for heavier boats so you have more prop offer. But I actually think that a 2:1 would perform better...:cool:

[baja200merk]

srx is basically a small ear chopper.

yesterday i ran my srx and it has half the bow lift of the 30 chopper. like with the 30 chopper i run negative trim over 70mph otherwise well u get it :eek:

kevin

[imq707s]

srx is basically a small ear chopper.

yesterday i ran my srx and it has half the bow lift of the 30 chopper. like with the 30 chopper i run negative trim over 70mph otherwise well u get it :eek:

kevin


What pitch SRX are you running? I've ran a stock 27, and it had decent lift. I also ran a stock 29, and it didn't have any lift at all.

My DAH worked 27 SRX has tons of lift.

[baja200merk]

stock 29... its gonna be faster then the 30 cause i wont have to trim in all the way after 80... can u say triple digits :D

[David]

By all accounts, DAH work magic with the SRX props. I sent mine to them without even trying it stock first. It's winter, my prop had nothing else to do.

[manateemauler]

How fast do you want to go that's what need's to be answered . I run a silverstreak omc prop on my 16 ft ally. with a 2 liter omc and i turn it 7500 rpm 69 mph in 800 ft and buy the way an srx is a v6 prop.

[ROLF]

SRX are avail in both 13 or 15 spline for 3,4 or 6 cyl OMC have ran them often and always liked the results,never the "best" for a certain application but always a good prop for all around use. Manatee Mauler,I love that little Ally of yours and esp that worked shorty V4.
Rolf

[bigboy]

My goal is 65mph:cool:

Maybe I can test one from somebody over here:)

[bigboy]

You mentioned changing your lower unit ratio to 2:1...I thought that was what all the small V-4 cases were?

There is a Flo-Torq II hub kit made by Mercury to fit the 4 1/4" V-4 cases, but Mercury lists it for Quicksilver props only...I wonder if it would fit a small hub Trophy. I had thought there were people running Trophy props on OMCs, but I could be wrong.

By the way, John Janaky's phone number is 262-534-4440. Not sure what the US country code is though.


This is interesting. 4 1/4" but my raker and stiletto just fit perfectly in it. So I dont think I will have the larger case...

Otherwise a trophy plus could have been a real nice prop for it. Thats the problem of a V4:o

[David]

On my boat, and on another boat, both with a small hub motors, the small 4.25" Trophy had way too much bite off idle. Total dog. I would not try one on a V4, even if it could be made to fit.

DAH can modify the lift characteristics of the SRX.

[Action Dave]

What pitch SRX are you running? I've ran a stock 27, and it had decent lift. I also ran a stock 29, and it didn't have any lift at all.

My DAH worked 27 SRX has tons of lift.


My DAH 27SRX provides decent lift and acclerates like a drag prop on my Action.
I also own a Performance Propeller worked 29SRX that gives me my best to speeds but it takes a bit to get there. Also if I have more than one passenger, I have to trim it to the balls to get the boat to air out.

I will be trying a 30chopper soon. if I can get the lift I want with a heavy load, I'll buy it.

On a side note: Anybody interested in a 27" Renegade 4-blade? I don't wakeboard off my boat anymore.

[Ron V]

My DAH 27SRX provides decent lift and acclerates like a drag prop on my Action.
I also own a Performance Propeller worked 29SRX that gives me my best to speeds but it takes a bit to get there. Also if I have more than one passenger, I have to trim it to the balls to get the boat to air out.

Yep...I tried a 26" ET cut chopper on my Rapid Craft and I don't think it pulled any harder than the 27" SRX...at least not enough to notice. Never put a stopwatch on it though.

The lack of lift with a passenger with your 29" is a little bit of what I experience with the 27". I had it worked by DAH and I think that helped slightly, but with a passenger it holds it down. Amazingly it only slows the boat down by about 3-4 mph, but at that point my 25" Trophy Plus is just as fast, lifts reel good and give the boat a nice angle of attack.

[bigboy]

It's clear that the SRX is not the prop I was looking for. There are now 2 ads on this board that sounds interesting:

4 blade Turbo:

http://forums.screamandfly.com/forums/showthread.php?t=148655

Mazco 23P:

http://forums.screamandfly.com/forums/showthread.php?t=148668

What do you guys think?;)