nice and clean rig job.
750hp that nice pwr as well
Is the "cobra" mtr a solid or hyd cam?

So Does It Have 90 Mph In It ?
Nice Boat :)

Same question I was going to ask

My guess is thats a bit optimistic on 750 HP. Either way it doesn't matter You have 1 bad ride , So congrats on delivery of your new 28 Mike. The boat looks great as always !!!!!

Mike, We saw 84 out of yours on GPS at 5300 RPM with a stock 28 4 blade and basically the same set up. Well I ran the boat very conservative since it was almost dark out , 25 MPH winds from the North East , and we had a small hydraulic steering leak under the dash but saw 5500 RPM ( labbed 28' 4 blade with a few added tricks ) with more left in it so I feel the boat should be good once it is all dialed in for 85-87 MPH on GPS. We are going to do WOT testing in a few weeks since Mike will be bringing the boat back down for a few days to enjoy here in South Florida.

JO

JO, Pepe and Linda, I want to thank you all so much for all your hard work these past couple of weeks. It was truely a pleasure. The boat turned out awesome and Im very happy with it. You all went above and beyond what I expected. I couldn't believe how many extra hours you worked just to get me out in time to enjoy the boat for Memorial Day. Thank you all again. I do look forward to coming down to run that in that big water you all have!!!!! thanks again..

Mike as far as the 90 thing goes I think may pushing it a little bit, but it does pin you back in your seat though. I'm sure after a little seat time and Jo running the boat we will see some good GPS speeds.

I'm sure either Jo or I will post some speed results when everything is dialed in..

thanks everyone for all the compliments. I do think that it turned out awesome. I will post some pics of it running soon promise..

Mike

Mike called a short time ago to inform me that he ran the boat up to 84 mph on the GPS recall at only 5200 RPM today in 90 degree weather with more throttle to go and a very conservative trim since he is getting use to the boat. Motor peaks out at 5700 - 5800 RPM so it should be running in the high 80s on GPS by the time we are dialed in with it. I am sure you will hear from Mike later today since he is out enjoying the boat this afternoon in the Chesapeake Bay.

I am really happy to know he is enjoying his new Pantera 28'.

JO

What a sweet ride with clean lines and not over done with grafics/paint! Congrades to Pantera and Mike! The boat will endure the test of time for sure!

Thanks. Vinyl graphics were simple and turned out really nice.

Regards,

JO

GB, Thanks for the compliments!!! I was out yesterday as well and the water was pretty rough and that boat can take to some serious water! My wife who is still to this day scared of boats was comfortable with the ride and were in about 3 to 4 footers and she was hanging on, but never once told me to slow down we were running about 55 to 60 in the snotty stuff and she was happier than ever and kept egging me on to go faster I was freaked out by her comments.

But anyway on my way to a place called Jellyfish Joels we hit 87 GPS and not really sure of the Rpm was a little nervous cause I'm still learning the boat but I think it was around 5600 or 5700 something like that. This boat is incredible!!!! I still think I have some carb problems to work out and the motor seems as it's running a little to fat and then when I try to idle around I really have to fight with it to keep it running. I guess there are always little bugs. Any suggestions as far as getting the carb to run better while idling would be appreciated.

The problem I have is that there are so many places that I have to go 6mph/ or no wake zones that I do need to the motor to act a little better while trying to do this.

Oh and l ordered mufflers for the boat that were supposed to be here for the weekend, but they weren't and my lovely neighbors across the creek were having a good ole time yelling at me to keep the boat quite and with dry pipes I couldn't here a damn thing they were saying I just saw their lips and arms moving and I just waved high and gave them the thumbs up. LOL my wife and I were cracking up. It was the funniest thing you ever saw.

mike, nice story.
You might try and tweek your idle mixture screws on the carb. It might help it at idle when shifting in and out of gear.. To lean it up try a 1/4 to 1/2 turn in on all four corners. Of course you may want to consult your engine builder first.

Mike , Glad to here you are home running her hard. 87 mph is awesome in a single. Sounds like you got her proped pretty good. The carb stuff you are gonna have to play with a bit, what does the transome look like after a good run? I'm sure she is a bit rich off the dyno, thats the safe way to go. You may want to sit under the hatch with it running and set your carb with someone else bumping it in and out of gear so you can get her just right. Congrates she looks awesome, I guess I need some cool graphics now.

That is great news Mike !! With a little more tweaking and a little more pitch we might see 90 MPH on GPS.Will play with it when you get down here.

Regards,

JO

Mike your carb was adjusted and tweaked at Cobra on the Dyno, do not attemt to play with it. Call Randy at Cobra and have him give you a new one set up like it yours with the same jets that left there or have him go through yours. Check your plug wires and make sure they are snugged on the spark plugs. Great numbers on speed, just remember to practice safety when you are doing high speeds with the wife on board.

Jo let me know when the boat comes down for testing, I`ll take out my Mig 28 for a fun run with you.

MiamiBoys, I've been talking to Randy and he had me try a couple of things, and he's sending me some new jets for the carb. I wasn't going to mess with it. Just seeing if it was anything simple. I started it up today with the mufflers on it and it sounds terrible and way to quiet. Anyway I let it warm up for a bit and I just can't get the thing to idle for anything I have to keep fighting with it. I think there is something else wrong with it. Like maybe something is clogged or something I don't know but it is frustrating. It's perfect 1500 rpm and up it's just anything below that I have trouble keeping it running. When idling around in gear it's either trying to idle at 700 ( which is a tad to low) or 1200 and that's to high. I don't know!! That's why I was asking for suggestions.

He also had me change some of the advance settings on the crane box and they seemed like they helped at first but then it started doing the same thing again.

Mike you may have a vacuum leak somewhere, check your intake.

Albert

are the flaps on the intake opening and closing smoothly?
could one be stuck open? either way, its a new engine. let cobra take care of it.

I would love to let Randy take care of it but I'm in Maryland and Randy is in Florida. So that makes it a little hard. I will be taking the boat back in a couple of weeks but I still want to use it for the time being. I was just hoping for something simple.

Albert I will definitely check for a vacuum leak that's a good idea. I just don't recall seeing many vacuum lines though!

Stormrider what flaps are you referring too the carb butterfly's or something else. If you are referring to them yea everything seems to be working smooth. the only thing that feels weird there is you can feel when the secondary's open there is a slight bump/ notch type feel there.

Oh and I tried the those Gibson mufflers at lunch and if someone wants their boat to be quiet these are your answer. I couldn't believe how much quieter they made the boat it's ridiculous. I was looking for some mufflers that just took the bite out of the exhaust not make it sound like it has silent choice. So what mufflers have you all used and what do you suggest. Again the mufflers really did their job it's just that we don't have a noise law here in Maryland and just trying to be nice to my neighbors.

The one thing I don't have on there is the rubber flappers but they really don't quiet the boat down do they? Have never used a boat without them so I really don't know!

Mike


Mike

I've got the Dana shtoguns on mine now and they don't do much and are a bit rattly. My buddy just put the Gibson's on his Gun and hasn't stopped complaining about how quiet the boat is. From my boat though they sound good. Rumbly but not too loud.

I had a set of the Eddie Marine (or similar other make) insert mufflers on my 24 and I though they were a good compromise and were out of sight which is nice. I'm probably going to go with the Imcos or the Gibsons when its time to replace the shotguns.

I've also heard a lot of people like the "donkey d1cks" because they're silent at idle but wide open when running, but I can't get past the look of them...

[QUOTE=MikeFormula;2150385]

Albert I will definitely check for a vacuum leak that's a good idea. I just don't recall seeing many vacuum lines though!


Mike a vacuum leak doesnt meen it is only the hoses, I meant on the intake or on the base plate of your carburator. Just check to see if everything is nice and tight. Some carbs come with vacuum lines that need to be plugged check that also.

Albert

yea I here ya the donky D's are some ugly pipes. My whole deal here is that I have this awesome sounding motor and I just wanted it a little quieter and I think that might just be a hard thing to accomplish. The Gibsons really don't sound bad they just are sooooo quiet so I know how your friend feels. Maybe if I knew they would get louder over time (like break in) it wouldn't be that bad but they have no baffling material so I just think they will stay quiet. You know. Man if I could figure out a way to drill them out some maybe that would work. LOL

thanks Albert, I will check this evening. Again I appreciate everyones help.

Its funny, I love how my boat sounds for about 15 minutes and then I'm ready to turn it down! 4,500 rpms for 45 minutes starts to wear on you a bit (coming back from Catalina is worse than going over though). I'm actually planning on getting an intercom!

I'd check out those Eddie/Hardin slip ins. You could even pop them out when you get out of your creek.

sorry, mike...yea i meant the butterflies.

kinda sux... i love custom motors, but its nice to have the builder nearby, incase of any little situations.

I like Mesa Balancing, but how was he going to check it out if anything happened? I found JC, who is local, and took care of me. Thats whats nice about merc... its safe, but just doesn't get me going like a custom motor.
Does cobra have any affiliation w/ a VA/MD guy who could come check it on their dime?

Mike, there is is a noise regulation in Maryland. Most people don't get bothered,but I would leave the mufflers unless they slow you down. If they have an internal rubber flap,they may get louder as the rubber gets tired of keeping 750hp quiet!

Well I decided on keeping the mufflers and went for a short ride last night and well to make a long story short I now have only 1 muffler. I don't really know what happened but I was starting to accelerate and then the boat became suddenly loud again. Stopped the boat shut the engine off and damn there was only one muffler left. I had those things very tight in fear that I might lose one, and well it happened. I don't think that the motor has that much exhaust pressure to blow one off. Unless one of the bolts came loose (which I doubt)! I had the bolts tight enough that it was collapsing the grove where collar snugs itself around pipe. Oh well more money down the drain. :(

So I guess if anyone has a used or new Gibson Bullet muffler that they want to get rid of let me know. I know I can't be the only one this has ever happened too! I hope :)

One other thing after I lost the muffler when trying to shut the motor off the motor did not want to shut off. It must have run for at least 10 to 15 seconds before it finally died. I know this must be related to my carb problems I'm having. It's been a long time since I had this problem and I just can't remember what it's related to. I've been running injection on my race car for some time now and I'm dumb about these carb things now. I need to get back in the game

Mike

sounds a bit like flooding.
can run at certain lower rpms and still runs after shut down?
or maybe an ignition problem? maybe a new MSD box need for testing/swap out?

carb shouldn't have anything to do w/ running after killing ign pwr. no spark ,should be no spark

yea I thought about that after I posted it. Your right though no spark no run. Do you think all these problems could be the ignition box. I'm confused now cause when you kill the power to the box it should kill the power period. Man between losing that stinking muffler and these other problems I might just sell the boat. I'm just kidding!!!! Love the boat and when I have all the bugs straightened out will love it even more. Just frustrated.

.

very understandable.
can u get your hands on another ignition box, to swap out and test?

Hey Mike sorry to hear about that. Check with SemperFi here on oso he had a real good deal on a set of Gibsons a while back in the swap shop , I just looked & they are no longer listed but he may very well still have them. As for the still running after you shut off the ignition : Have you guys ever put a timing light on it ? I am sure that Cobra set it where it needed to be but that doesnt meen that it couldn't have moved. Just a thought because if it is to high with lower octane fuel it can keep running or (dieseling) when you shut it off. ( which I don't know if that is what you are talking about or not ? )

Mike if I were you I would not run the motor anymore untill you get the gremlins out with your carb issue. I would hate to see your motor melt, Randy needs to hook you up. I know he is down here but when it comes to issues like that a solution to your problem has to made. I know Randy, he has a great warranty reputation.....

Mike have you read the plugs and check the timing? Rick's comments are the same thing that crossed my mind, but then again I pay someone to work on my boat!

Also, not to detract from the point of this thread, but what kind of race car? I do still work on my own race car at least, well most of the time!

Beutiful boat mike. I feel warm and fuzzy all over just looking at it.

It could be somthing as small as the idel being set to high. alot of times it the idel is set higher than what the motor likes, when the key is turned off after running at resonably high RPM's. She will still try to keep running. She'll spit and sputter and finaly decide to shut off when the fuel is gone. That is if I am understanding this right. If it is, back the idel of about 1/4 to 1/2 turn. That should do it. Again, if I understood everyting right.

Thanks for the replies, atleast I know you all help when you can. As far as the timing I haven't check but I will tonight. I was assuming that when talking with Randy and he had me change some of the advance settings on the ignition box that eveything was ok.

Now for the plugs they look great not black not grey no specs of anything. They did look just right.

And thanks for the link to the mufflers. that was truely a damn shame when that fell off!!!

Well Randy sent me another carb and although it was a 1940's tank dominator (I mean this thing is old) it worked much better. I can idle at 700 or 800 all day long. It was all he had there and he overnighter it to me so I had something for the weekend. The only thing that is weird is my top end speed is way down. About 10mph to be exact. I wasn't trying for like top end runs just got it up there for a few seconds and I could just tell that it wasn't there. He's going to redo the one I was using so that's good, but the only other problem I'm having now is when taking the boat out of gear the rpm's will shoot up to like 1200 and then slowly come back down. What could be causing this symptom. I doesn't exactly idle perfect when it's out of gear,but when it's in gear it runs awesome. At least I'm narrowing my problems down some. It should be good soon. I also have a dominator that I had Barry grant do a couple of years back from my race car. It's a little more cfm but always ran more mph than any other carb me or my friends had and everyone always tried to buy it from me, but now I'm glad I never sold it. So I might try that one too. I'll just put all the jets from the one over to the other and try it.

Mike

How do you all set up your exhaust for a EGT gauge. I use them in my cars and on my bike but I don't have water jacketed headers on them. On my car I have bungs and on my bike I just drilled and tapped the hole. So how do you all do this? This is the one thing I've always used to tune the motor correctly especially when spraying them or just for tuning. I know that there is a little bit of the primary tube exposed before the water jacket starts but isn't that too close to the head for an accurate reading?
Any suggestions would be greatly appreciated!

Mike