More hp out of a 500hp
 

I have a 500hp carbed, i just had the whole thing pulled apart its been honed and cleaned and i bought the 741 cam to put back with new lifters.

I was wondering what would need to be done to 650 to 750 hp out of the motor if i can i see 650 with out blower i would go that route if i have to add blower want 700 to 750.

Also with the blower which is the best candidate for the price and the best one for the motor!blower shop pro charger Whipple what? I am not sure what would be the best route to go. Thanks for looking jeramy

You'll have to make it a 540 and increase compression a little to get around 650hp.

If you Whipple it ,,,you gonna see 700 + ,easy !:evilb:

I am really looking for the best possible route to go. So sounds like blower would be best. I just had the block honed it didn't need bored so i want to run it all season and make it a 540 next season. Is Whipple the best way to go if use the blower?

Running pro charges on 500hp carb motors that work well. I'm building a pair of engines now and want to run whipples on them , just having a hard time selling the whipples to the wife at 14k each !!!!! Good luck :ernaehrung004:

Where is the best place for the whipple as far as price anyone?

OK after thinking about what to do i do not want a blower . So with that said what would be the best route to get the most hp out of the motor. I have the 741 cam and new lifters already. So if someone could steer me in the right direction that would be great budget 5000 to 6000. I was thinking to start a set brodix heads and msd ignition.

If you have 6K for both engines, make 540's and go with the rest next season.:party-smiley-004:

I only have a single motor. The reason i didn't go with the 540 was the when the motor was apart they said it didn't need bored so i figured save the life of block and bore it next time around. If i did the 540 idea i would also have to tear the motor apart again and buy all new gaskets so that really is not a option at this point.

Also as far as heads go what would be the best choice. I also was wondering if i bought the heads for the 500 now when i went to the 540 the heads wouldn't big enough?

Where is the best place to get the 540 upgrade kit or do they even sell one?

$hit for 6 K i sell you my racemotor,,,10-1 compr. around 650 HP Bowtie Block standart deck 9.800 ,1050 Dominator ,lots of tourqe,,,510 CI.:eek:
Complette fresh , just rebuild .
You can sell yours and have more HP for less or i take as partial trade.
Lets say ,,,yours and 2 K. ?????

We have a B&M 420 blower that will help you get there . :drink:

can you send me a bunch of pics of the motor. And the details of what the internals are as far as je pistons what kind of heads valves rockers ect. [email protected]

Will do, but its at the engine shop right now ,,,so need time.
If you realy whant to do it,,just tell me what you whant and i have him put in what you whant.

Ofcorse not 20K stuff ,HAHA LOL

Right know it has JE Pistons ,forged crank 4" internal Balanced,
Jessel valve train complette, 230 /190 valves SS, Dart heads,B&M valvecovers,Lightning Aluminum oilpan,Manley rods, Crower solid cam, engine is set up to run 6500 RPM.

Any more info i need to ask,,,i just pay for all the stuff al the time ,so "beats me" . Everything is new inside exept for the valvetrain and the block ,heads,intake(Dart).

Here is a pic for now thats all i have.

ubet28

I was in the same situation as you last spring. Bottom or engine was in good condition and did not want to spend more money for no reason. I worked with Bob at Marine Kinetics. He has mastered HP500 upgrades. I went with AFR 315 CNC heads ported and milled to 114cc chamber. Custom cam that Bob picked out. Willie's 850 cfm carb and Keith Eickert exhaust manifolds. PM me if you would like more info.

What kind of power did you see? I already have a the cam. I am gonna get some heads just not sure of what yet. The OSO community seems to go with AFR.Does any one run Brodix heads. Should i change stock pistons and carb or leave it alone?

You could have your carb modified for your new componets. I found it was going to cost within a few hundred to get mine modified compared to purchasing a new one and selling the other. I am running the stock pistons and rods. Rods were fitted with better bolts. Do a search on OSO for Bob Madera or Marine Kenitics. He is the guy you should talk with.

We carry the entire whipple line and at the cheapest prices on the market. Couple that with the best tech support in the industry and you got the whole package. Let me know if you would like some more insight on your application and possibilities. Whipple.
Thank you,
Brian

So,
I have a set of HP500s that I want to do the same to. What HP are you running now? Where is Marine Kinetics located?
Thanks,
Dean

We just got cams from Bob ,They will go on the dyno next week . Bobs # is 1-585-654-8583:drink:

382,
Thanks, I give Bob a call.
Dean

Bob is great to work with, If you planing to order a cam from him have some time to spend on the phone (45 min or so )he will have alot of questions for you. (ie boat,motor size,intake,carb,heads,RPM,) I hope this helps!!!!! :drink:

Joby

I just used Bob for my roller setup. He is a true expert on engine building. A far cry from the so called tech guys. I got it running this weekend but have not had it on the water yet.

J,
I haven't called Bob yet, but I plan on trying to reuse as much as possible all of the HP500 componenets as I can. I will run a different cam if it will work with all my other HP500 stuff. I will run different exhaust and have some head/porting work done, but I'd like to keep the compression ratio stock so I can run 87 octane. Does anyone have an idea on how much additional HP can be gained from the stock HP500 Rect. port iron heads?
Thanks,
Dean

TTT, looking for some input?
thanks,
Dean

Dart intake and 850 holley !!!!

Or whipple the bad boy !!!!

Both prooven !!:ernaehrung004:

I run Brodix heads quite a bit and love them. I also use Dart Pro 1's and love them to. Pretty much all of the heads on the market today are good and I really don't think you will see a big difference in power between any of them. The problem you will have is not being able to raise the compression enough to take advantage of the heads. The whole purpose of going to aluminum heads is so that you can raise the compression. In order to get the compression up, you need to deck the block. The pistons in a stock 502 are about .020 below the deck. I would not deck the block a whole lot now, because if you go to a 540 you will need some of the deck height.
You can deck the heads and get the combustion chambers down in size as much as possible now and then later when you go to a 540, you can just run a thicker head gasket if you need to lower the compression. It all depends on what combo you use for the 540 in the future. Give me a shout if I can help in any way.
Eddie

Eddie,
Great talking with you today. Thanks for all the insight, I just wish you were closer to FL!:cool:
Dean

Thanks, for the advice, but I want to stay away from any blower upgrade. Too many Manatee zones to idle thru!:mad:
Dean

Well its been a long winter but the shop called Friday and was ready to to dyno my motor. I had this thing completely gone over cleaned and magna.

I ended up going with 741 cam and Brodix BB2+ heads with a blower shop 250 blower. when i went down to the shop my camera battery was dead so i will put some pictures of the motor this week. I did take a picture of my dyno sheet so i will post that.

Let me know what you guys think and i could use some advice on a prop size.

The boat is 25 outlaw 1998. Thanks to everyone that helped out with advice.

http://i41.tinypic.com/20889d5.jpg

Nice numbers, love to see the pics of the motor also.

Who did you end up going with?
Thanks,
Dean

I hope the afr's are not correct. That engine will never live in a boat with afr's that high in boost.
Eddie

How much compression can you safely run normally aspirated in the 500hp keeping the Iron head? 9 or 9.25:1?

I stay at 9.3 - 9.4:1
Eddie

Maybe thats why we never got to see any more pics.

Might still be sweeping up the parts.:lolhit:

yeah but it got great mileage!!

Eddie,
Do you use AFR heads in any of your builds?
Thanks,
Dean

In that post, afr's referred to air/fuel ratio, not afr heads. Sorry for any confusion. And yes, I have used some AFR heads and was pleased with the performance. There are a few minor things I wasn't happy with though. Not a big deal.
Eddie

Eddie,
A big DUH on my part!:eek: Do you mind telling me What you didn't like about the AFR heads?

Are you going to the PRI show this weekend in Orlando? I think I might go Sat Morning with John Cosker from Mystic power boats and this Crazy motor head friend of mine.
Thanks,
Dean

No, I can't make the show. I will be in Vegas this weekend for a little R and R.
The biggest thing I didn't like was that there aren't any openings in the head that lead to the lifter valley. The only openings are the oil drain holes on the ends of the head. That's another thing, the oil drain holes are way to small. I spent a bunch of time opening the holes and opening a path for the oil to flow out of the head. I run a bunch of oil pressure, so there is a lot of oil going to the top end. I need to get that oil out of there and back into the pan as quick as possible. I open the holes in any set of heads, but none are close to as small and obstructed as the AFR's.
Eddie