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HPBoats83
12-08-2007, 02:02 PM
What would your best guestimate be on this? If I have a 540 putting out about 500hp right now and I added a 6:71 blower how much more power do you think I would pick up? What if I added an 8:71? At what point do you start to loose reliability when you add a blower to the motor?

pw_Tony
12-08-2007, 02:07 PM
Try asking that in Gear heads, and be ready for alot more specs on this motor

Wet Dream
12-08-2007, 02:18 PM
20#s

boatnam2
12-08-2007, 02:22 PM
What compression is the motor?that will make a big difference in what you do.I would say a 540 running 5#'s is pretty reliable if you have the hard parts in the motor should be good for around 750hp or.Hope you have a built drive that will break next.

superdave013
12-08-2007, 02:33 PM
At what point do you start to loose reliability when you add a blower to the motor?
as soon as you tighten down the last bolt if you plan on doing that to an engine that was not built with a blower in mind.

RP2
12-08-2007, 03:06 PM
What would your best guestimate be on this? If I have a 540 putting out about 500hp right now and I added a 6:71 blower how much more power do you think I would pick up? What if I added an 8:71? At what point do you start to loose reliability when you add a blower to the motor?
I hope your not planning on puting it in that Hawaiian... it would be a very dangerous situation.:eek:

LGCDEVIL
12-08-2007, 03:38 PM
I hope your not planning on puting it in that Hawaiian... it would be a very dangerous situation.:eek:
Please elaborate.

HDF WATERDOG
12-08-2007, 03:47 PM
Simple answer is the minute you bolt it on. It'll look pretty though.

Jbb
12-08-2007, 04:10 PM
The engine pictured below, was a bone stock, Marine Power 502 Premium....I upgraded the fuel system, with a Mallory 140 pump and bigger lines......Upgraded the ignition to an MSD 6al, and 85551 Dist....I upgraded the valvetrain, with screw in studs and roller rockers..Inconel exhaust valves..and a new valve job...added a Blower Shop 8-71 @7 lbs boost with 2 AED 850 carbs...Upgraded the credit limit on my gas card....ran 93 octane fuel......and ran the shit out of it, without the first problem, for 120 hrs.....at which point I sold it...Nothing like the look, sound, and performance of a supercharger..:)
http://www.***boat.com/forums/attachment.php?attachmentid=44810&stc=1&d=1197158991

RP2
12-08-2007, 05:00 PM
Please elaborate.
That boat has a very narrow (85") beam and can not handle speeds over 70mph. Also, the layup and thickness of the hull is inferior to industry standards which can only lead to tragic events when to much power is applied.

HPBoats83
12-08-2007, 05:43 PM
That boat has a very narrow (85") beam and can not handle speeds over 70mph. Also, the layup and thickness of the hull is inferior to industry standards which can only lead to tragic events when to much power is applied.
Yeah I know the Hawaiian isn't that great of a boat, but there is no reason you need to be talkin shit. That motor isn't going to go into a Hawaiian, it will be for another project I am working on. Back to the motor, it has already been set up with a blower in mind with low compression, flat top pistons and the whole nine yards. Just bolt on the blower and go is how that motor is now.

ColeTR2
12-08-2007, 07:11 PM
The blower 671 is a little small for a 540... if you want to run pump gas. The smaller the blower the faster you have to spin it to make boost. the faster you spin it the more heat... witch heat is a killer for pump gas. Most pump gas deals will also run a intercooler. Make sure it has a blower cam in it and if you running carbs they will need work done on them to. I had a 468 BBC with a 1071 3% over make 700 hp on pump gas. Lots of tork you will love that. good luck..

Baja Big Dog
12-08-2007, 10:16 PM
The engine pictured below, was a bone stock, Marine Power 502 Premium....I upgraded the fuel system, with a Mallory 140 pump and bigger lines......Upgraded the ignition to an MSD 6al, and 85551 Dist....I upgraded the valvetrain, with screw in studs and roller rockers..Inconel exhaust valves..and a new valve job...added a Blower Shop 8-71 @7 lbs boost with 2 AED 850 carbs...Upgraded the credit limit on my gas card....ran 93 octane fuel......and ran the shit out of it, without the first problem, for 120 hrs.....at which point I sold it...Nothing like the look, sound, and performance of a supercharger..:)
http://www.***boat.com/forums/attachment.php?attachmentid=44810&stc=1&d=1197158991
Amen!!!:D

hkunz
12-08-2007, 10:28 PM
Both my blower motors are factory built, but here's an idea - the MINI is 205 HP with a 19% overdriven blower, stock 1600 MINI motor is about 160. That's about a 28% increase in HP. The Advantage is 600 with the blower, and a 525 is a similar motor (502 CI with less static compression). The blower is 3.3L, but I don't know the under/overdrive ratio. The percentage of increase (this is in a motor that a major corporation is willing to warranty) is 14%.
The 6-71 and 8-71 designations came from the GMC truck engines the design was originally used on.
Since 6-71 is a V configured six cylinder, 71 CI per cylinder two stroke diesel engine, (8-71 being the same but with 8 cylinders) and 6x71=426, as opposed to 8x71=568, which is closer to your 540, I'd go for the larger unit so I didn't have to spin it as much.
What is the manufacturer telling you?

Lavey29
12-09-2007, 05:44 AM
What would your best guestimate be on this? If I have a 540 putting out about 500hp right now and I added a 6:71 blower how much more power do you think I would pick up? What if I added an 8:71? At what point do you start to loose reliability when you add a blower to the motor?
I have an Eickert 540 and with the 8-71 at 3 pounds it was running 700hp. I added an intercooler and turned it up to 7 pounds and now its running 850hp at 8:3.1 comp on 91 octane. Perfectly reliable due to top of the line internal parts, heads etc...

boatnam2
12-09-2007, 06:48 AM
hpboats you hang out at Hpb, my buddy just had a bunch of work done there.

RP2
12-09-2007, 11:29 AM
Yeah I know the Hawaiian isn't that great of a boat, but there is no reason you need to be talkin shit. That motor isn't going to go into a Hawaiian, it will be for another project I am working on. Back to the motor, it has already been set up with a blower in mind with low compression, flat top pistons and the whole nine yards. Just bolt on the blower and go is how that motor is now.
At no point was I talking shet. I was simply stating facts regarding the safety of that boat with to much power applied... relax! I think the boat is a good value but you must keep in mind safety as it realtes to power.

HPBoats83
12-09-2007, 09:27 PM
hpboats you hang out at Hpb, my buddy just had a bunch of work done there.
No I don't hang out at Hawaiian at all and don't really wanted to be associated with them in any way shape or form. As far as I am concerned I don't care for any of the guys who work there, and they paint most of their boats red, white, and blue. My boat will never be there again for work done to it.

McIntyrelocal
12-09-2007, 09:52 PM
if the motor is setup right a blower motor can be very reliable, im building one right now and thats why im building it more horse power less rpm for the rotating assembly.as long as your not trying to rotate the earth youll be fine.the bigger the blower the less the engine works to make the boost like tr2 said.Low compression,small amount of boost with the right cam you could make 750+ no prob.but i would not run a 6'71 on something that big.and if your buying a bigger blower make sure its not a race blower the clearances would be way to tight for a river boat.you want something settup alittle looser for a pleasure boat.like tr2 said again way to much heat.

DMOORE
12-09-2007, 10:34 PM
540CI, 8-71, intercooler and pump gas. 800HP EASY.
Darrell.

Havasu Hangin'
12-10-2007, 07:10 AM
In general, each pound of boost is worth 50HP.

HPBoats83
12-10-2007, 09:09 AM
In general, each pound of boost is worth 50HP.
Cool, that is a good rule. I am not looking at making 1,000 hp, but just want something that is going to be as reliable as a blower can be, but making some decent hp (750 - 800) for this project.
Thanks,
James

Havasu Hangin'
12-10-2007, 09:26 AM
Cool, that is a good rule. I am not looking at making 1,000 hp, but just want something that is going to be as reliable as a blower can be, but making some decent hp (750 - 800) for this project.
Thanks,
James
Like DMOORE said, if you start with 500HP, add 6lbs of intercooled boost, you'll probably have a 750-800HP pump gas-friendly motor.
With the low boost and low RPMs (5,500 and below), that is not a scetchy recipe.