will this motor work for a supercharger
 

@ 4 to 5 psi boost? Say a B&M 250 with an intercooler, :drool: put it ina 236 ELIMINATOR EAGLE AND WHAT DO YOU THINK IT WOULD RUN FOR SPEED? Would a Bravo 1 hold up?
Merc 502 block
Howard hydraulic roller cam R6212
Mark 4 push rods
7/16 arp studs
JE strip pistons 8.9 cr
10 degree retainers
10 degree machine locks
miller billet aluminum rockers 1.7 r
Detroit race gasket set
HOLLEY 80870 AUTOMOTIVE STYLE W/ELECTRIC CHOKE AND VAC SECONDARYS
98611 VALVE SPRINGS
SINGLE PLANE ALUMINUM INTAKE
H SERIES BEARINGS
ROLLMASTER tc
7/16 dimple rods 4340
mellings oil pump
arp ballancer kit
hiperf 502 oil pan
stainless intake bolts
stainless race valves
bored honed deck plates
decked
balanced
blueprinted
comp head work
4 bolt main
open cahmber rec port heads
forged crank

Re: will this motor work for a supercharger
 

With 8.9 compression you probably could get away with 4-5 lbs boost. I had a B@M 250 on a 454 mag. Yours will make about 550 to 575 hp I would guess based on what mine made but I know nothing about your cam. I would bet low to mid eighties in that Eagle with the right prop and x dimension. I never lost a drive in about 130 hours on mine. If you take care of it the Bravo handles 500 or so hp ok.

Re: will this motor work for a supercharger
 

My 502 with a B&M 250 @ 5# boost, 1050 dominator dynoed 625hp. Only motor work done on mine other than new bearings, rings and valve job was a change to the Crane 741 Crane hyd roller cam in place of the stock flat tappit and titanium spring retainers. Stock 8.75CR, rect port heads, JE forged pistons. Ran in a 27 Fever for a solid 6 yrs in front of a stock Bravo and never a hint of drive troubles. Just never hammered out of the hole.

Re: will this motor work for a supercharger
 

My setup was the EFI blower and was rev limited to 5200. US1's numbers might be closer to what you will make than mine because yours won't be set up with a rev limit. The faster you spin the more power you will make.

Re: will this motor work for a supercharger
 

Thanx... this is a great forum.

Re: will this motor work for a supercharger
 

Your boat should run 85-90 mph. My 25 eagle goes 94 with the wrong prop on it! The only diff. is 7psi boost and alum heads, my compression is 9.1 to 1. Greg

Re: will this motor work for a supercharger
 

Is there much price difference between a 420 and 250 B-M blower. Depending on your budget, I would think that spinning the 420 slower for the same boost with less heat. Also check for a good deal on aluminum heads, by the time you pay to redo rectangular port Chevys for $400-500 w/guides and valve job, springs,etc. you can step up for a better set of heads reasonably. The new version Rec. port aluminum Chevys I've seen for $1100.00 on ebay. I would prefer these over the oval ports, for this application, because of better exhaust flow numbers out of the box, the rec. ports are much better out of the box on the exhaust side. Otherwise this motor looks great, what is your anticipated budget to build this piece?

Re: will this motor work for a supercharger
 

I am looking a t a hull right now. I am currently a bentop boater i just sold mine about 2 weeks ago. I am working on a deal for the B&M used right now for about 3200 w/carb and chiller used but rebuilt. the motor is a showroom piece sitting inthe display area of the dealer that i am looking to buy th ehull from. the hull w 500 hp books for 27800 and i am hoping to get the wholething in the water yet this year. i am thinking i should runn the motor wiout the B&M for 15/20 hrs or so just to make sure it is all working rpoperly before i put the squeeze to it. Should i get a 1.36 drive or will the 1.5 be acceptable?

Re: will this motor work for a supercharger
 

I didn't see it on the list, but make sure your exhaust valves are Inconel, or I think some manufacturers also call them "severe duty". My 502's are like US1's, except I run twin carbs..

Re: will this motor work for a supercharger
 

God THIS IS FUN!!!...... Any who, i do not know if the exhaust valves are inconell they are listed as stainless Steele race valves. The motor is put together and is ready to drop in so i would not pull it apart just to put severe duty valves in. I am the type of guy who likes to go fast but i do not hammer on something (such a s motor ) until it has total catastrophic failure. If i feel the need to or something happens i will tear into it then. The motor is built for marine usage and i believe the service manager that it will hold up even though they told me No Warranty. They do not warranty race applications. would this be a dependable turn key setup or am i asking too much? The cab on the B&M Right now is listed as a 950. I should ask the person installing the motor if we can swap out the 870 Holley for another 950. that way when i put the B&M on it i can have 2 like carbs on top. This would be slightly better than just one 950, i could rejet the two for better fuel distribution. would 2 950'd be too much for this app?

Re: will this motor work for a supercharger
 

two 950s would be too much.
I wouldn't even consider running a blower without a good set of inconnel exhaust valves.
Last summer I disintegrated a cheap inconnel exhaust valve in a 8.75 CR naturally aspirated engine at 4500 RPM. Part of wedged between the piston and head , cocked the piston and cracked the cylinder wall. Could have been allot worse.
DS

Re: will this motor work for a supercharger
 

Inconel exhaust are recommended but I think you can get by without them if you are sure there aren't any reversion issues, with too much cam overlap. With the blower you want at least a 112 LSA, so check your cam, to minimize overlap and water ingestion thru the exhaust.

Re: will this motor work for a supercharger
 

thanx I will see how it runs this year and if i get the chance i can always tear into it next year. What about the drive? i can have either ratio bravo 1 what would you pic? Keep in mind the person selling me this boat dose not know i want to put a blower on it.

Re: will this motor work for a supercharger
 

Sure it will work.

Roby

Re: will this motor work for a supercharger
 

If the engine is sitting on a display stand it is much less of a pain to change the valves now than when its in the boat! Those heads can be off there in 15 minutes.

Re: will this motor work for a supercharger
 

Been said before, if you want zero hassles with this proposed setup call Nickerson and tell him what you have and he will tell you what you need. Simple as that. You can order all the parts from him and it will all work. Don't do things the hard way cause you do them twice.

Re: will this motor work for a supercharger
 

Do the valves now or do the WHOLE motor including parts you had no intention of replacing later? Thats not a hard question to answer! Call a carb expert for your carb,its not something you want to trial and error on and MELTDOWN!

Re: will this motor work for a supercharger
 

I am thinking about not putting the blower on right away, it is not difficult to pull the heads in the boat so i will probably do that once i find out how it runs. I am looking at a used blower setup with a chiller but i am curious where is the best place to purchase a setup like this if i want to go new, and how much should i expect to pay new? How much is this blower/chiller/carb setup worth used but rebuilt 20 hours ago?

Re: will this motor work for a supercharger
 

What Do A Good Set Of Inconell Exhaust Valves Run And Where Is The Best Place To Get Them?

Re: will this motor work for a supercharger
 

Call Ferrea directly and they run right at $30 a piece. They are based in Florida. Measure to verify that your valve size is 1.88 and stem size is 3/8 probably, and the length. I believe they have those in 1.89 which will lap in fine since there is only .005 difference in each side of the valve. I used these same valves when I changed mine over to Inconel, they are a solid made piece.

Re: will this motor work for a supercharger
 

Thanx And That Is Cheap Insurance. Now I Just Have T Get The Whole Thing To Come Together.

Re: will this motor work for a supercharger
 

+1 for Nickerson.

He sold the setup to the previous owner that has been on my boat for a long time. I sent him the carbs last year for a refresh, and followed his tuning and setup directions. Boat runs awesome, idles great, no soot.

Re: will this motor work for a supercharger
 

what is Nicherson's #?

Re: will this motor work for a supercharger
 

Just an alternative, but I got my blower carbs from Teague. Been running them for 6 years, and never had a problem.

Re: will this motor work for a supercharger
 

Nickerson..

http://www.nickersonperformance.com/...e/a_links.html

Re: will this motor work for a supercharger
 

Hpy 540 , I have a few sets of used 3/8 inconel standard length 1.88 and 1.90 manley exhaust valves . pm me if interested. Tom