Saw this on the OSO beautiful 30!!

[lcboater]

I stand corrected You are absolutely right I thought kunkel's boat had twins, That is a incredible high dollar rig .Still took a 1000 hp and a #6 to get it there. It is in line with the 28' Dana I saw and a few others out this way. Ok I am on your side about the Checks and I must say I have never been in a 30' convincor. They are just not out here. This has gone away from the reason I prefer twins in a 30' and larger boat.
I worked on my boat yesterday to take it out for a speed run at Lake Elsinore. I am looking to break 100mph in my 253. it will do it I just have to.
IC what engine set up and what kind of speeds do you see?

kunkel's boat has a bravo drive on it. i think jason said the motor was 950hp.

 

[check253]

Jason has the only 30' convincor on this site that went over 100mph I know of and it had twins. I have raced some DCB extreme 28' w /single engines at Havasu and left them like they were standing still, they claimed big hp and custom engines and 1700 lbs heavier If you ever take a trip to Havasu it's a power war there. I see what works and what doesn't. The cats are a different class the v-bottoms not many run over 100 and if they do they have big money in them. Most I see and that I have been in are 30'+ with twins with serious HP. I saw a guy with a 28' Dana offshore single engine serious rigging 1200+ hp he was over 110 mph. I went over to the beach and looked at it after I saw him hose some cats. I drooled at the Imco 1000 drive ,twin screw whipples on a Dart 598c.i.w/ big chief heads. He had 100k in rigging.
The 28' Howards are all over the place. and the 27' Halletts are so heavy but nice and stable they are a task to push over 100.
I never have been a camera bug but I'm going to start taking a lot more pictures this summer.
In a 30' boat I would have to have twins, The checkmate 30' my be a exception but personally if I got to that size boat I would have to have twins.

Jason is not the only 300 over 100mph. Mine has been 114 and I'm pretty sure it will be another 4 or 5 mph faster when we're done prop testing next spring. There is a short vid in the action thread that show us at 107 this fall. I had a 253 before the current one and had it at 104. It did take over 1000 hp to get me there in the 253.

 

[Big Red]

I still belive a twin engine in a 300 Convincor is useless.

The boats listed below have went over 100 with a single engine. I have never found any info on any twin CM I/O going 100 plus. Most boats listed have been well over 100 not just touching it.

Convincor's

2001 300 Convincor Check253
2003 300 Convincor Kunkles
2004 300 Convincor Kunkles

ZT's

2001 280 kellyo
2003 260 Daves260

Check253 please link me pics to your 253 that ran 100 so I can stick it in the 100 plus club. I just have your 300

 

[mkhammer]

kunkel's boat has a bravo drive on it. i think jason said the motor was 950hp.

If this is the boat you are refering to this is a #6 with ITS this picture was posted by Big red a year ago.

 

[mkhammer]

Jason is not the only 300 over 100mph. Mine has been 114 and I'm pretty sure it will be another 4 or 5 mph faster when we're done prop testing next spring. There is a short vid in the action thread that show us at 107 this fall. I had a 253 before the current one and had it at 104. It did take over 1000 hp to get me there in the 253.

Excellent I would love to see it, I am always interested in a hot set up.
I am going to run my boat at the Havasu speed run this year to have my speed documented. There is official timing at Lake Elsinore at certain times I will make one of them.
I'm still testing as well, It will do over 100 mph but I want it documented for business reasons as well as bragging rights.

 

[Big Red]

If this is the boat you are refering to this is a #6 with ITS this picture was posted by Big red a year ago.

That is check's boat he is talking about this one

 

[mkhammer]

That is check's boat he is talking about this one

Thanks for setting me straight BR,
I like Checks boat that is sweet.
Kunkle has the same Drive setup I'm running it looks like.
When you get your Carver running you will apreciate twin engines and understand where I am coming from on a larger boat.
I agree with you now about the 300 most builders put a single in a 28' boat anyway.
By the way If I buy a new convincor it will have twins and it won't do 100. it will be a OBX with twin 300's. I asked Kip if I could come out and get a ride in one he said they don't have one to ride in at this time.

 

[Big Red]

Thanks for setting me straight BR,
I like Checks boat that is sweet.
Kunkle has the same Drive setup I'm running it looks like.
When you get your Carver running you will apreciate twin engines and understand where I am coming from on a larger boat.
I agree with you now about the 300 most builders put a single in a 28' boat anyway.
By the way If I buy a new convincor it will have twins and it won't do 100. it will be a OBX with twin 300's. I asked Kip if I could come out and get a ride in one he said they don't have one to ride in at this time.

That Carver is a big heavy lug that I will be lucky if it runs 40 with a good tail wind. I am still shopping

 

[mkhammer]

That Carver is a big heavy lug that I will be lucky if it runs 40 with a good tail wind. I am still shopping

you mean it won't do 100 lol

I take it you have not driven many twin engine boats, I don't know that for a fact.
I like the characteristics of a twin engine boat even at 35 I'll give the carver you will feel the manorisms. After a certain length , weight and beam you have to go to twins.
I must say I did not know the 300 convincor was so efficient, I am impressed with what those guys did all of them. I can see check 253 running 120 mph, your boat is awesome man.
I am proud of my 253 I have said it before it turns heads and it's fast compared to a lot of other v-bottoms. But the cats are humbling, Where I boat it is mostly cats fast ones. When a 160 mph F32 DCB passes me like I'm standing still when I'm doing 85. I feel slow and small out there.

 

[Big Red]

MKHAMMER

The way speed and hp has been posted on this board threw the years the 300 Convincor seems to be the best boat for speed. To be honest I feel if you stuck your engine in a new 300 hull it would run faster.

I will agree most 30 foot plus boats need twins and docking a 30 foot boat is a challenge. But from what I have seen the 300 is no different to dock then most Convincors. They all seem to wobble from side to side.

How could you go from a I/O to a twin egg beater Convincor. Right off the bat you will be limited on your speed.

 

[mkhammer]

I would be doing it for other reasons than speed. Comfort room and reliability and twin egg beaters still move pretty fast. I boat in the ocean too I go to Catalina Island and up and down the coast. If it's not a OBX it will be a center counsel of another brand with twin outboards the 25 is too small.
I have been stuck in the ocean it's no fun. Even if you have vessel assist you could spend all day and into the night getting home.
With twin engines one would take you back. I want to get where I'm going. I am not new to this I have been a boat owner of one kind or another for 30 years. There are not many Checkmates on the west coast. No west coast representation for sales there may be in the future. This is the third engine I have had in my 253 I got it with a hp 500 in it that ran just over 70 mph with steer by cable. It handled like a piece of crap. I pulled the engine stripped everything off the transom, trashed the teleflex helm and re rigged it.

The narrow beam boat had a whole new feel to it. Felt So good I powered it to where I have it now. Back when I bought my boat nobody I heard of had a 100 mph 300 convincor, There was some that claimed 100 and over in a 253 and 260's the list is still not very big. You can correct me if I'm wrong Kunkel is the first I heard of that broke 100 in a 300. Knowing what I know now and was going to do it again. I would set one up like check253's a #6 with an extension box you could put any power in it you want and run with confidence.
If I blow the drive on my 253 I will go to a Imco scx with a extension box and integrated steering you can't stuff a #6 in a 253. http://www.mkhammer.com/store/product.php?productid=302443&cat=2909&page=1 I may be able to get a deal on one.

 

[Check This]

Stock Egg beaters are not going to push you as fast but they are much more reliable and economical then the race motors that are in the picture in those other boats. The expense of the one single motor and drive still out weighs twin O/B's before when I was talking power I ha no idea anybody was running race motors in a C/M. Sorry guys it just never crossed my mind and it is definately not the norm.

 

[hotdaddy27]

I just ordered every Simon upgrade I could find!!!!!

I am hoping for speed gains between 15 and 20 MPH. Although, speed isn't my primary goal with my boat.

 

[check253]

I still belive a twin engine in a 300 Convincor is useless.

The boats listed below have went over 100 with a single engine. I have never found any info on any twin CM I/O going 100 plus. Most boats listed have been well over 100 not just touching it.

Convincor's

2001 300 Convincor Check253
2003 300 Convincor Kunkles
2004 300 Convincor Kunkles

ZT's

2001 280 kellyo
2003 260 Daves260

Check253 please link me pics to your 253 that ran 100 so I can stick it in the 100 plus club. I just have your 300

I don't have any pictures of my 253 on my computer. It was a 1997 model that I used until 2000. As you can imagine keeping a brave drive together with 1100-1200 hp was a challenge. After breaking my 4th or 5th drive i decided to get a 300 and use a #6. I put stock power in the 253 and sold it to a guy from Conneticut.

 

[Double J]

I just ordered every Simon upgrade I could find!!!!!

I am hoping for speed gains between 15 and 20 MPH. Although, speed isn't my primary goal with my boat.

Did you check with "Checkie" first?? Cause he is all knowing on outboards and now inboards!!!!!!!!!! ...lol.... Are we lucky or what???

 

[hotdaddy27]

Did you check with "Checkie" first?? Cause he is all knowing on outboards and now inboards!!!!!!!!!! ...lol.... Are we lucky or what???

I am very lucky, I am researching the possibility of adding another 300XS to my 2100.

I am hoping for speeds around 130 to 140.

I have also had conversations with Ocean Performance about adding a 280ROS as a trolling motor. I think the weight on the bow will scrub off about 15MPH but my plan is to make that up with Simon upgrades to both 300XS's.

HD

 

[mkhammer]

I don't have any pictures of my 253 on my computer. It was a 1997 model that I used until 2000. As you can imagine keeping a brave drive together with 1100-1200 hp was a challenge. After breaking my 4th or 5th drive i decided to get a 300 and use a #6. I put stock power in the 253 and sold it to a guy from Conneticut.

Check, I have some questions if you don't mind.
when your 300 was rigged was there enough room in the engine compartment?
Did you have to move the rear seat or fuel tank forward?
I know your engine is farther forward then a bravo set up because the transmission, And this must improve handling characteristics. Also your #6 with the extension box your boat rides like a 2' longer boat through the rough. I am sure you have the king of set for a convincor you must experience race quality handling and ride.
Also did you have any special lamination or larger or stronger stringers such as micro-lams. or is a stock hull?
I have question like gear ratio, prop selection and X-dimension. Or if you would do anything different. If it's a secret you can PM me I won't tell. Or If you just don't care to say I will respect that too but I would sure like to know.

 

[check253]

Check, I have some questions if you don't mind.
when your 300 was rigged was there enough room in the engine compartment?
Did you have to move the rear seat or fuel tank forward?
I know your engine is farther forward then a bravo set up because the transmission, And this must improve handling characteristics. Also your #6 with the extension box your boat rides like a 2' longer boat through the rough. I am sure you have the king of set for a convincor you must experience race quality handling and ride.
Also did you have any special lamination or larger or stronger stringers such as micro-lams. or is a stock hull?
I have question like gear ratio, prop selection and X-dimension. Or if you would do anything different. If it's a secret you can PM me I won't tell. Or If you just don't care to say I will respect that too but I would sure like to know.

One of the things that's unique about the setup is that the engine is in a stock bravo location. We used the extension box to house the transmission. The boat interior is stock. I didn't want to move the center of gravity forward at all. The prop is acutally 53" from the transom so we have a big lever. The boat "thinks" it's 3' longer than it is. This boat stayed in the mold a little longer than normal but otherwise it is a normal layup. We did add a gusset to the stringer where it meets the transom for a little more support. I was used to driving a left hand rotation bravo so the #6 is also left hand. The gear ratio is 1:24 to 1. I have a 27pitch 16.5" diameter 3 blade and also a 29 same diameter.

Drive height took a little more trail and error. The boat left Checkmate as a blank. We did all the drive and engine rigging and installation. Merc. racing told us where to mount the drive but they were way off. it was way too high to start. Eventually I had to have the transom filled and we lowered the drive. I am using a 3" spacer which is the largest they make. We could probably go up a little from the current location but the boat handles so well and is so stable can't really see any reason. If I want to go faster, I can just turn up the boost

 

[check253]

Checkmate did blueprint the bottom before it left the factory and i had it redone a year or so later. There is no hook or rocker in it.

 

[Check This]

Guys I posted this thead for a 30' I/O for sale and now some of our members who run these boats are putting forward some great insight. Somewhere along the line outboards came up and should not have. If you guys want to talk about how you wasted your money on the 300xs's thats fine but lets move our debate to another thread. As I have said before I know nothing but little I do know is this before I spent 2 to 3k to pick up what a 400 dollar prop would have given me, I would have asked around. You chose not to and thats your choice. From now on I will defer my comments to the outboard experts here. I can't wait to pick up a mile an hour for a couple of thousand bucks. The thought of rolling up my snap in carpet and taking out my bow cushions is keeping up at nights!!! Wow what a dope I am.