900 HP and an IMCO SC
 

I am getting a 900+ HP 565 Whipple charged BBC from Tyler Crockett. He suggested the IMCO SC for the engine. How bad is this going to be?

Re: 900 HP and an IMCO SC
 

i say 25 hours per drive less if you beat on em, ask artic friend how many he's puked on his ride

Re: 900 HP and an IMCO SC
 

Hey Quent,
If your looking for drives, your motor must be done. Looking forward to seeing it run.
Hey, I would talk to Max Machine works. Their XR upgrades seem to be holding well up under some big horsepower. I would also talk to IMCO regarding the XA 1000, vs the Extreme SC.
I don't know anything about the new Konrad Ace, but Biggus on here (OSO) is a rep for them, and can probably fill you in.
Regards,
Steve

Re: 900 HP and an IMCO SC
 

PM NJSonic. he had some problems with his Max Machine works drive and the warranty..I also heard they recalled the Imco 1000's??

What about warranty??? :eek:

The BMax is warranted to 950TQ/HP

Like rat said Smitty has probs with his lower gears .The lower gears are the week link in all on them that still use the Merc style gears.PM Smitty he'll give ya the scoop?

I am running the B max's :drink:

Rob

Re: 900 HP and an IMCO SC
 

Guys, thanks for the words of encouragement? I am going with the IMCO SC and try to be gentle. (Yeah, right.) I'll keep you posted as this thing comes together, maybe 2 more weeks. Tyler dynoed the engine yesterday using 2 pulley sizes, one for 93 and one for racing fuel. You don't race dynos but it will be interesting to see the results.

Re: 900 HP and an IMCO SC
 

My current motor made 944 hp and 967 ft lbs of tq on Tylers dyno last spring. I'm running a max worx drive with all their upgrades other than their billet lower hsg which is supposed to have double vert shaft bearings which supposedly will make the lower gears last longer. My lower gears seem to be the weak point,about every 50 hours or so the lower gears start to chip and fall apart. My boat spends as much time Idling thru no-wake zones as it does cruising under hard power so thats really more like it breaks the outdrive every 20-30 hours of actual hard use. In My opinion ANY drive that has STOCK xr type gears once all the other upgrades are done will still have gear failure once you start making the kind of power we are talking about. I change my outdrive oil just about every weekend (5-10 hours use) and there is ALWAYS metal in it. I bought a complete Max spare outdrive and all the tools to rebuild them and when one starts to make noise I pull it off and throw the spare on while I fix it. I would have just bought a B-max a few years ago but there old models still used stock xr lower gears too so it wouldn't have been any better for me that I could tell. With all the new drive options that are coming out I'd reccomend buying something with stronger gears so you can use your boat without problems. Ive got 20,000$ wrapped up in my drive and spare drive,in retrospect that money should have went towards something that would be trouble free,I sure wouldn't do it again today.
Is Tyler going to tune your motor once its in the boat? My motor ran excellent on the dyno,made killer torque and he set the air fuel ratio thru out the rpm band between 11.2-11.8 (as close to 11.5 as he could). Once it was in the boat it ran good but felt like it could run better. I threaded a o2 sensor fitting in my exhaust and Tyler temporarily installed his portable o2 sensor meter in boat and we drove in it while he Re-tuned it. The air fuel ratio was closer to 9.8-10.5 at alot of rpm bands as installed. He re-programmed it under real world conditions while we were under way until the air fuel readings were back around 11.5. The boat ran much cleaner,slightly faster and got about 10-20 % better mileage. After seeing that I would HIGHLY reccomend doing that on anything after the initial dyno run. It was something else watching Tyler sitting in the back seat of my 272 Baja while flying down the St Claire river at 80-90 mph while he punched his lap top :eek: . He didn't even want a life jacket!!! I was standing boat up totally out of control off cross-chop and rollers we were hitting and he kept saying "keep holding it,I need to see the numbers stabilize". Good luck,let us know what you decide and how your boat runs. I saw a hair under 93mph at the end of last season,if I get a shorter lower casing I expect to see mid to upper 90's this year,Smitty

Re: 900 HP and an IMCO SC
 

It's gonna break at some point or another, it's just a matter of how long it's gonna make it. If you can get thru a season and rebuild in the winter your doing ok. It's all about setup, the tolerances have to be perfect if they're going to last for any given length of time.

For me there were no problems with the lowers, I kept breaking upper drive gears.

I'm switching over to the BMax and I'm looking forward to seeing how things go. :cool:

Re: 900 HP and an IMCO SC
 

Tyler said he runs an Imco on his race boat. He also has a 1200 hp turbo motor that he runs for fun in that same boat. I beleive alot has to do with how you drive your boat. Easy off the line and roll into the throttle versus slamming it wide open and it will go further before it gives up. If you want something that will not break, then your only choice is a Konrad if you are going for a Bravo type setup.

Re: 900 HP and an IMCO SC
 

I give it one good wack of the sticks...with 900HP they ain't got a chance in hell.
I had issues with a leaky upper and also one without the water passage machined in it.
And all I got was...
"What part of no warranty don't you understand"
Phuck IMCO!
Get the Bmax and take it easy till the new lower gears get worked out, then drop those in and go.

Re: 900 HP and an IMCO SC, redux
 

Smitty and others, thank all of for you for responding. Whoever said that speed costs money, how fast do you want to go?--- forgot to say that you don't even have to go. I've spent too much too soon and my motor is still dry.

Tyler called yesterday and my 565 Whipple makes 1000 ft lbs of torque at 3500 and 940 hp at 5500. So, what do you do with that except, as many have stated, be really careful with the drive. My Sc delivered today with wimpy U joints that will be upgraded. I called the Brave Shop today and the BMax is 5 to six weeks out. That is not an option in mid April. I am reminded why I don't have twins.

I am having a bung for the O2 sensor put on the exhaust and Tyler said he would be happy to come and fine tune the motor once on the water. I have aggravated him to no end by asking too many questions and he has been way more patient than I would have ever been under the circumstances.

I'll keep you posted once EB Marine gets all of this plugged up in my 27 Lavey cat. What the heck? At 58 I may not have many years left. Let er rip.

Re: 900 HP and an IMCO SC
 

Not to be a smartazz or something, :rolleyes: but why is there such a big gap between max torque and max HP?
Thanks............Frank
Normally you want to see a 1000 to 1200 rpm variance.

Re: 900 HP and an IMCO SC
 

My Whipple charged motor TQ peaked around 4100 and HP peaked at 61-6200.I think its the Whipple that builds TQ real early.

Rob

Re: 900 HP and an IMCO SC
 

Frank, good question. I'll make sure my info on max hp vs rpm is right when I talk to Tyler today.

Re: 900 HP and an IMCO SC
 

I haven't used any of the IMCO SC drives yet. The IMCO extreme drive with my 750 1X4 carb package lasted 5 hours. This is in a 37' Outerlimits which runs about 105-106 mph, and is not totally dialed in yet with props. I would also consider the ACE Konarad drive if you are going to have honest horsepower like that.
Best Regards,
Dean Gellner

Re: 900 HP and an IMCO SC
 

buy a 6 and forget about saving the initial money, they just wont hold up period, plus is'nt your life worth the difference in price.

Re: 900 HP and an IMCO SC
 

If money isn't an option sure get the 6 but it's easier said than done.

A. New IMCO's are around $18K for a pair. Save your money and buy XR's and have them set up properly, it's basically the same thing.

B. A new pair of BMax HT's with a 1 yr warranty is $22K or, if there are some R&D drives available you're looking at $17K. You can purchase an additional 2 yr warranty for $1500 a drive, so you have 3 yrs total warranty.

C. New #6's + transmissions + fiberglasswork = $60K +/-.

I went with option "B" but I'll have to see how everything goes.

Re: 900 HP and an IMCO SC
 

It will cost you in the long run, 900hp on Bravos spells instant failure, your money , your life, just giving you my opinion, In 2 years you will have spent what a 6 costs, plus your boat will be in the shop all the time, and your desire to boat will be shot, been there

Re: 900 HP and an IMCO SC
 

The only people that I have heard who have success running higher HP (750+) applications with an XR or Imco variant are people who put those drives behind IMCO extension boxes with the torsional drives shafts and a soft rubber coupler.

The theory being that the torsional shaft and the soft rubber coupler absorbs the drive line stresses - especially when the boat launches and comes back into the water.

I am having a set of 625 Ilmors put in a 38 Fountain and may add the boxes at some point for just that reason.

Re: 900 HP and an IMCO SC
 

I see your point but with the BMax you spend $22K + $3K for 2 yr extended warranty.

$25K for 3 year warranty, you could do it all over in 3 years and still come out ahead. :evilb:

In a perfect world I would have 6's but the fundzalo disease doesn't alow it. :drink:

I almost forgot, $6K for props.

If this doesn't work, I'll just get some 525's. ;)