More Power
 

I Have 525sc's In My 38 And Want More Power,I Have Already Installed Chillers And Pulleys And Do Have More Power Than Stock But Now I Want More!cams,Heads Etc Or Do I Scrap These Engines And Start From Scratch!Whats The Best Way?How Much More Will The Right Cams And Heads Change The Engines Or Are These Things Maxed Out Now? Thanks!

Re: More Power
 

You can probably get some ideas from guys on here, but I would suggest that you would still/eventually PM "rmbuilder"...he has the knowledge, experience, and integrity to help you get set up with the right head/cam combination for the cubic inch size of your engines, type of application, etc. He has helped me with my combination, and several others here.

Re: More Power
 

KAAMA has a good plan, I may add that you have a good induction system you may want to add some stroke to the engines and gain some CID. That extra .250" of arm does wonders.

Chris

Re: More Power
 

At some point the blowers themselves become the bottle neck. Will 250 blowers fit the intercoolers you bought?

Re: More Power
 

im not sure if the 250 will fit the coolers,i will find out today,thanks!heres a pic of what i have now

Re: More Power
 

It is my understanding that increasing the cubes with the same blower will drop the current max boost some since we are now feeding a larger volume. I would want to know if you would still gain horsepower with the lower boost if you keep the present blower.

Re: More Power
 

I'd say scrap the old induction and drop on some 8-71s at around 7-7.5psi with some roller cams....
Come to think of it, MSD ignition and spinning it at 5600rpm should help too.
Forget the rod deal, a .250 longer rod may give you 5-7hp.

Re: More Power
 

so i guess get rid of the induction from intake up?what about getting new heads or flowing out mine,which way is better?

Re: More Power
 

What did you find out about a larger blower fitting on your present intake?

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I wouldn't worry about the heads...good enough for the 454CID.
I might even take back the cam swap idea....to much work and $ for a 30-40hp gain.
The 8-71's should do it.

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bolting on 871's and getting rid of the 177's and chillers aand pulleys will make more powre?how much more?

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Why are you not listening to KAAMA and cstraub? Those were the only answers you needed. --- Jer

Re: More Power
 

you looking to pull the motor out or just work with what you got? Lunati also makes a cam that is an upgrade to the 525 SC cam. I have it in my 580's but I would have been better off going with a hyd. roller in hindsight.

Cam requires the motor to come out cause you need to drop the pan.

Re: More Power
 

im looking to do what ever it takes to make my boat go real fast!pulling motors no big deal,rr whatever,no big deal,just want to go fast,if i can do that with what i have to build on great,thats what i want to know!

Re: More Power
 

What about the drives. You've probably got near 600hp now with the 7 lb pulleys and intercoolers. You might be in the new bravo every year crowd with extra hp.
Have you considered boxes. On some deep Vs, boxes, higher X dimension, and moving some weight around is worth 3-4mph.
The 177 is probably at it's limit with that boost and size engine. More boost from a bigger blower will get you more hp, but probably at the expense of engine and drive reliability.
Run those til they're tired, then replace with a blown 502 or 540. Oh yeah, then buy a few extra bravos.

Re: More Power
 

Holley list the 177 up to a 502 CID engine. I would put some stroke to the engines and go .030" which would give you 489 CID. Spend the money on some good coated pistons so you can turn the boost up and let them rip. I would think you could squeeze another 100HP per side with this.

Chris

Re: More Power
 

Don't tear those 525's apart...they got good stuff in there.
Just some 8-71's and maybe even hyd. rollers if you want to spend the $.
There could be some speed left in the X Dim...maybe some -1 IMCO lowers too.
But as mentioned... the drives are at their limit.
Fast boats are fun but broken fast boats really suck.

Re: More Power
 

Yes they do!!!!! :eek:

Re: More Power
 

Go with tall deck Dart motors . Stay conservative and make 540's . Also recommend Dart heads. 502 blocks with 4.25" stroke suffer the same problems as 572 Tall deck blocks with 4.5" stroke. It is too much stroke and the piston side loads and premature wear to the block, piston and rings is the end result. I have been told that 5.375 stroke is the limit for a 10.2" tall deck block if durability is expected. That combo would make 555 Cid. Although no where near poor, I am not in the same financial league as any real serious all out ,as fast as your wallet can take you kind of boat owner. I have had the priveledge to work on boats owned by such persons. I also have been advised by machinists who know far more than me. The end result will be running in my boat next season, I have to build things right. I can't afford to buy parts twice, three times etc.(especially when everything blows up catastrophically! ) I didn't launch last year. It's ok . Maybe next year. Got a perfect 540 so far .

Re: More Power
 

how about a pair of 700hp 572's with under 30 hours? im installing 588 blower motors around the first of the year? will take 20k for the pair complete and ready to drop in? deduct what you sell yours for and its a very inexpensive power up grade

Re: More Power
 

I guess it depends on what your really want and how much you want to spend .How much power do you think you have now?

How much faster do you want to go?

Stroking ,heads,cams, may not be enough? Also I would say you will start breaking drives .Stroking it will make more TQ than the others and theres your drives again

I built a 460ci chevy for my old Scarab same as your bottom end with some merlin heads ported ,HDY roller ,8 71/ with innercooler and 2 gold claw 775's it made 762hp on the dyno.It was tuff on drives in a single engine boat .


So what do you really want???

Rob :drink: :eek:

Re: More Power
 

ok..JJ....slowdown buddy!! I guess u expected more from your upgrades?? I would guess that you picked up no more then 25-30 hp with the coolers, but you added to the reliability considerably. Why would u "scrap" what you have.........at least use them hard till you kill them, then rebuild. You need to put more thought into what you really want. If you want to go "really fast" as you stated, then buy another boat. I had the same set-up as you and had new 460's built dyno @ 625hp. The boat now runs 80gps. I love the boat because of the size, handeling, ride and cabin....but to get into the mid to high 80's i would probably need another 100hp per side. Also, u will smoke your drives after adding more power...I upgraded the original Bravo's and ran them easy....grenaded my starboard drive @ 5,500...not a pretty sight! Had to purchase new XR's with -1" Imco shorties. Big $$ considering i thought i was done spending.

BTW...I kept my 177's( i love how they sound ), 1050 dom's, and original intakes. New everthing else except block. Bumped the comp to 8.25:1 with Dart iron eagle heads. MSD Ignition, Full roller, etc... Boost dropped down to 4lbs because of the free flowing heads even though we bumped the comp. I had to cut the stock pulleys down to get boost back to 6lbs.

I am very happy with the new motors (and drives), and I purposely had them built to be reliable, mild and last.

Ratmans idea sounds reasonable??

I can get you allt he specs for my motors if u want to build a similar set-up. Add Your coolers and u will have easy 650+hp. Nice flat torqe curve also.

Good luck....

Re: More Power
 

There you go. :cool:

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talk too a builder with a trsack record of good engines. not a desktop dyno guy. call zul or mer, tommy at chief has a great rep...

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Lee at LAB engine is no schlep either. I believe Ritchie Zul used to work for him years ago. Ritchie Zul is known as a premier engine builder hands down. Lab is also an awesome shop. They work with cutting edge engines. I was just over there and saw some amazing custom 12 cylinder all aluminum big block marine motors, that he's dyno'ing. Lee is a such a source of knowledge, and best of all he is willing to share what he has learned in over 45 years of building race motors with those who really want to know more. I learn things every time I visit the shop. I really don't know Ritchie Zul , But he must be very intelligent. I know Lee, And feel that he probably is the smartest man that I have ever met. Lab engine is located in Lindenhurst NY. 631 226 2234 BBB

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Hey Who is Lab ?Please give me some back ground

rob :drink:

Re: More Power
 

Iamfaster,send Me The Info You Have !i Know You Have The Same Boat As Me And Its Sounds Like Youve Done What Im Doing!i Am Also Considering The New Boat Idea Aswell If I Can Get The Right Price For Mine,until Then Im Going To Keep Hammering Away Because Like You I Realy Like My 38! THANKS [email protected]