Re: Prop help Best Prop for a 28 heat
 

I think you'll be very happy. I believe Julie has all of my specs.
Dave

Re: Prop help Best Prop for a 28 heat
 

Dave:
I talked to Julie today. She does have your specs and they will add cup to mine too. Did you
have your 27" fully blueprinted? I am.
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Steve,
I just had the cup added.
Let us know how it goes :D
Dave

Re: Prop help Best Prop for a 28 heat
 

The prop's back & bluprinted. The intercooler is on. Unfortunately the blower belt supplied was way too short. Ordered a new one which should be in Monday 12-27.
Weather's been a ***** (cold), but weather man says high 50s low 60s this week.
If things don't fall apart, I'll have new test results to report soon.
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Steve, I just finished installing the 2 575 intercoolers I ordered along with yours. We tested the boat last Wednesday. Thought I'd share a couple of things I ran into. First, on one of them the blower mounting studs (reused from old intake) were too long and had to be cut down. Apparently the holes in the new intake weren't drilled deep enough. Secondly we had water leaks from the adapter for the thermostat housing. We removed it and installed some plugs in the unused mounting holes and resiliconed it. One of the blower belts was very tight. Actually had to remove the blower pulley and slip the belt over it before sliding it on the shaft. Cold start enrichment was way too rich. If you touched the throttles when first started it would go rich to the point of fouling the plugs. You had to just fire it and let it idle until it reached 140 deg. then it was fine. On our test run the A/F ratio ran around 12 to 12.5 except it went to 10.7 at WOT. That was before any reprogram. I just sent the ECU to Whipple with our test data. I'll check it again when we get them back. It was turning about 4800 in the summer before the ICs. The air temp was 39 when we tested last week. We were hitting the limiters at 5400+ RPM. Boost went from about 4.5 to 6. We'll be going up in pitch for a retest. This is on a 2005 42' Fountain. We hit 89 on the GPS with 30" 5 blade Maximus props.

Re: Prop help Best Prop for a 28 heat
 

Bob:
Ran into problem #1, and stacked some washers. Not too techy, but seems to be working.
Problem #2 was the thermostat housing adapter ran the large hose on the starboard side into the serpentine idler pulley. We had to cut/reposition and tig it up. Haven't fired it up yet as my new (ordered 57 3/4" and 58 1/4" Gates, the supplied Bando is just 56" and won't fit over my 3.5" blower pulley) belt(s) won't be in until this afternoon. Had to rebend the hard fuel line. Rear hatch won't close, as expected.
I will watch for the water leak. Thanks for the heads up.
I am running my intercooler off the water pump and the Teague 3 way adapter. Are you running off a seperate pickup, or the water pump?
It is encouraging to hear your boost is good @ 6PSI. I assume that's with a 3.5" pulley?
Keep me posted on your progress Bob. I hope to test tomorrow.
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Steve, I installed a seperate transom pickup and ran it to a custom sea strainer with 2 3/4" outlets. Out of that with #12 hose to both engines. It seems to be flowing plenty of water by the time it's on plane. I don't like the water flowing through the intercooler at idle.

Re: Prop help Best Prop for a 28 heat
 

Bob:
We ran the boat on the hose today and ran into the water leak you mentioned. Got the adapter to thermostat housing leak fixed, then it started a small leak between the adapter and the intercooler housing. Will chase that down tomorrow.
Ran the boat with my new blueprinted 27" P5-X. Water temp was 46o/air 55o. The boat ran fine except for a slight out of the hole stutter, which felt like the motor was fat, and probably was with the cold lake water, but not a big issue at all. As the lake warms up, I'm sure this will diminish.
The engine pulled hard to the reprogrammed limit of 5800 and showed 84 MPH on both GPSs. I could have easily pulled the 28, blueprinted or otherwise. Acelleration was like a drag boat, usually a sign the that your underpitched. I'm trying to figure how much speed and rpms I'll lose due to heavier summertime loads, and warmer air and water. I think around 300/350. If so, the 27" should put me right on 5500, and will be OK.
The boat felt like it would have turned 6000 easy today with this prop, not that I'm trying to. All in all I think it's running pretty good, just need to keep tweaking the setup.
Will keep you posted.
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Gaining on her :D :D :D :D

Re: Prop help Best Prop for a 28 heat
 

Hi Dave,
Seems like I'm finally making some progress :D .................
There are a few other things going on here. My boost is coming in a little later, and it's just
a little less (5.5ish) than it was pre intercooler. Not unusual, I expected it. So, I will try to run down a 3.25" or so blower pulley. I'd like to get back to 6/7PSI. Now that I have the intercooler, I'm not as worried about detonation like I was without it. There's a few HP and hopefully MPH. I have also run down a standard length Imco lower unit to try. I think I'm running fast enough now that it will help. How much, I don't know.
Should be an interesting test though. I also think with the added boost that I can go back to a 28" P5-X (seems like I could now).
By the way Bob, it doesn't seem like running the intercooler off the water pump has hurt my idle. And the water here is very cold (46o) compared to what we normally have (80+o).
Happy New Year Team Nordic :drink: ,
Steve

Re: Prop help Best Prop for a 28 heat
 

Wow Steve, that thing must be making some pretty serious HP. By my calculations you're making darned near 700 HP to get that speed.

Re: Prop help Best Prop for a 28 heat
 

Bob:
That's what I'm coming up with too. Factory rating 575HP, +75/80HP for the AZ Speed boost kit (their #), +50ish HP (my estimate) for the intercooler and you have 700HP :D .
That Fountain should hauling ass too when you get ECUs reprogrammed. I have a friend here that has a 42' with twin HP500s with Whipplechargers on them, and he's running 95 on GPS with 6 PSI boost. I think he's making about 700 HP per motor.
Regards,
Steve Z

Re: Prop help Best Prop for a 28 heat
 

Guys:
Some of you may have run into the issue of the Weiand/Mercury 256 blower having a splined shaft, not a keyed shaft like the standard Weiand. Mercury probably did this to make it more difficult to repulley this blower for warranty reasons. I was considering having the Blower Shop put a keyed shaft on mine while it was out there for a freshen up, so I could use the Holley/Weiand automotive pulleys, which are much easier to source.
The splined pulleys have been pretty hard to come by in smaller diameters. I am happy to let you know that Teague is now making them in a variety of diameters :D ..............
I just ordered both 3" and 3.25" pulleys from them to fine tune my boost after installing the intercooler. The 575 comes with a 4" OD pulley stock. The AZ Speed & Marine boost kit for this motor came with a 3.5" pulley, which gave me A 2psi average boost increase.
Based on that comparison, it looks like a .5" diameter decrease is good for 2 psi, so a .25" diameter decrease should be around 1psi. I'll let you know how this turns out this Spring (usually early March here).
Happy New Year :drink: ,
Steve

Re: Prop help Best Prop for a 28 heat
 

Guys:
I talked with Lonnie at the factory today. Whenever I've needed anything from parts to advice, he's been right there. I was going to put a hatch insert into my upper hatch for clearance with the intercooler (don't want to cut a hole in the pad or run a Harwood), but he recommended spacing the the two halves apart with wood supports. I did exactly that last week, and now have 5 air intakes on my hatch vs the two standard ones. He is sending me extra vinyl to recover the extended rear and sides on the upper hatch. I'll post some pics when we get it finished.
He also told me they just got their first 600SCi in :cool: ............I wonder who's going to get that toy? The 600 should be perfect for Nordics with their relativley low rear hatch. If I had that set up vs the 575, I wouldn't have to re-engineer the hatch.
I think the 600 should run close to 80 on a 28', and 2 of them in a 35' should get close to
100. And with a pulley change and ECU reprogram :drink: .........................
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Steve,

On your blower pulley dilemma, is the splined shaft the same, smaller, or larger than the "normal" keyed shaft? I might can make a pulley adaptor to allow using standard pulleys on the Merc shaft. If the OD of the Merc shaft is at least 0.006" smaller than the ID of a standard pulley, then I can do it.

Might be a good item to offer as an accessory.

mc

Re: Prop help Best Prop for a 28 heat
 

Mike:
I've located a full range of sizes in the splined version. They are now available from Teague Marine. I now have 4", 3.5", 3.25" (now installed), and 3". The quality of the Teague pieces is very nice, same as OEM.
Thanks for the offer though!
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Bob,
I just found a neat little piece of hardware that Hardin makes. It's a pressure relief valve that cuts out water to the intercooler(s) at idle. It is adjustable for pressure. Think I'll set around 5 PSI to start, as my idle pressure is just 2-3 PSI.
This probably isn't necessary with the transom pickup to strainer system you're using, but for my setup, strainer to seawater pump to intercooler fitting, it should be perfect. I'll let you know how it goes.
How's the Fountain, twin 575 setup coming?
Regards,
Steve
PS Eric B tells me he bought some hardware from you. He's a great guy, and I'm glad you two hooked up.

Re: Prop help Best Prop for a 28 heat
 

Steve, I had not seen that pressure valve. Looks like the perfect deal.

I'm supposed to retest that Fountain in the next week or 2. Got the ECU back from Dustin so we just need to recheck A/F numbers. Then he'll order some more props. Dustin said he removed a lot of fuel from the cold start enrichment, and leaned it a little at WOT.

I quoted Eric for a Whipple. I haven't heard back from him if he was going to do it or not. I think he had to get momma to bless it. Sounds like a pretty wicked boat he's got.

Bob

Re: Prop help Best Prop for a 28 heat
 

Im in the process of getting a Stock 500 EFI Blue Motor with the CMI's headers .I have the Non Step Bottom 98 Heat .I have already bought a 24 p bravo 1 .should i recup the 24 or start with a 26P bravo 1 or any other suggestions also need the S pipe Tails for the CMI's
Thanks Bill

Re: Prop help Best Prop for a 28 heat
 

The stepped version of that hull would come with a 26 with the 500. I'd try the 24 and see where you're at. The 26 may be a bit too large. What engine, speed and prop were you getting before?

Re: Prop help Best Prop for a 28 heat
 

I havnt tried the 24 P yet. but with a mirage 23 on my 502 mag EFI Im getting between
58- 61 mph at 4800- 5000 Rpms weight 5800#- 5400# depending on water and air temps.

Re: Prop help Best Prop for a 28 heat
 

I think the cupped 24 is the correct prop for your boat. My calculations put your speed around 66-67 with the HP500 so I think you'd spin that 24 around 5100-5200 RPM.

Re: Prop help Best Prop for a 28 heat
 

thanks bob ill try the 24 then have throttle up add some cup if i hit the rev limiter.

Re: Prop help Best Prop for a 28 heat
 

I'm in the market for a boat around 28'. I recently inquired about a 2003 heat with a stock 496HO and the salesman told me it sees mid 80's. I assume this man is on crack?

Re: Prop help Best Prop for a 28 heat
 

He has some kinda of disfunction or he's just retarded :chimp: About 800hp will get you there :evilb: :evilb: :evilb:
67-68 will be the real numbers.
Dave

Re: Prop help Best Prop for a 28 heat
 

Thats what i thought after reading some of these posts. Thanks dave.

Re: Prop help Best Prop for a 28 heat
 

Guys,
Ran today with the 28" P5-X, this time loaded heavy, both tanks topped off. The boat ran 84 @ 5500. I'm grinning :D .
This was just a quick 1/4 mile blast. Very efficient in the midrange, 50 MPH @ 3500. These props are the sh*t on these boats.
Tomorrow I'm trying an Imco gearcase in the same gear ratio to see what that does.
Oh yeah, the pressure valve worked great with the intercooler. I'm very happy with the plumbing setup now.
I set it to kick in @ 8 PSI. Nothing at idle, gushing as the boat planes off.
Regards,
Steve

Re: Prop help Best Prop for a 28 heat
 

Century 29...I have a 2001 Heat with a 496HO and 67.8 is my best Top end.

By the way, it is for sale and very, very clean if you are interested.

Re: Prop help Best Prop for a 28 heat
 

Guys,
I ran the Imco lower unit today. Same ratio (1.50), same height (standard) gearcase, with the same 28" P5-X.
Objective results VS the XR, you heard it here 1st :rolleyes: ,
85 MPH @ 5600.
Net results are:
1 Gained 1 MPH
2 Gained 100 RPM
The boat was loaded (light on gear, 2 nearly full tanks, 1 person) exactly the same as yesterday. Test conditions were close to identical (60o air/50o water/moderate chop).
Is the Imco worth $2100 for a case, switching your internals for just 1 MPH? Tough call. Not too cost effective.
Upside though, I did hit the limiter, so there may be more there, It looks cool as hell, my water pressure was 10 PSI higher @ 28 PSI (better for the motor and intercooler).
Oh yeah, the boat did handle very well, maybe just a little better.
Regards,
Steve :drink:
PS Century 29, tell your dealer he is dead nuts on for speed, he's just 300 HP short.