How Much Boost????
 

Ok all you supercharged guys post your hot setups.

Static compression?
Boost pressure?
Displacement?
Heads?
Cam?
Intercooled?
Type of supercharger?
Engine Hours?

Trying to see how many actually run over 8lbs of boost? on 8 to 1 motors. Pump gas.

Thanks in advance.

Re: How Much Boost????
 

8-1,procharger aw504 intercooler,merlin heads,arp head studs,merlin block,540 ci,9 psi boost.cam motion hyd roller 622 lift,228/238 at .050,95 hours w/no problems,93 octane,felpro marine head gaskets

Re: How Much Boost????
 

Whipple charger non intercooled 5lbs boost,383 sbc,8:1comp, Dart pro 1 aluminum heads, custom comp cam hydraulic roller, 1050 pro systems dominator running 93 octane pump gas 24 hours, made the mistake of not running stud girdle and broke a exhuast stud, nothing else.

Re: How Much Boost????
 

Good Question!

So far my hottest setup is on Dean Nickerson's boat:

8.25:1 compression ratio
8.5 psi intake manifold boost
498 CID (stroked GM 454)
Ported GM cast iron heads, FelPro head gasket
Dart single plane intake, Nickerson carb
Solid roller, ~250 @ 0.050"
Rtech Supercooler
Vortech V-4, J-trim, ~45,000 RPM
Engine hours unknown, had a B&M 250 before this.
Measured intake air temperatures:

After blower - 225F
After intercooler - 80F
Cooling water - 60F

This setup has been dynoed at 950 HP @ 6000 RPM using 30 degrees total timing and 92 octane. I have another customer with two similar 498 engines in a new 43 Black Thunder. He used a hydraulic roller cam and made 875 HP @ lower RPM/lower boost.

I know your question is aimed at longevity/reliablity at these boost levels. Since boost can be up or down depending on cylinder heads, cam and displacement, I think reliability is better measured against the HP being delivered. For example, 8.5 psi boost on Nickerson's engine results in more cylinder pressure than 8.5 psi boost on stock heads with a hydraulic roller cam, even though he uses less compression. It is easy to spin the blower faster on the stock engine to try and up the cylinder pressure, but with this comes more heat, so the overboosted stock engine may hit the detonation limit before Nickerson's would.

In any case, the key to avoiding detonation is to keep intake temperatures as low as possible. This is achieved mostly by having a large, efficient intercooler, but also by lowering the restrictions to air flow that must be overcome by the blower. If you can do that, then the blower doesn't have to work as hard and you have less heat to begin with.

It would also be interesting to know what head gaskets people are having the best luck with on these high boost engines. I think Nickerson used Fel Pro. I remember asking him and he wasn't doing anything special. I hear the Cometic gasket is working well on nitroused drag car engines.

Re: How Much Boost????
 

Wow Tomcat your chiller drops it by 145 degrees.

My example is

8.0 to 1 static compression
9psi manifold boost at 5000rpm
540cubic inch 4.5bore 4.25stroke
Fully ported merlin cast irons with cometic gaskets
Crane hydraulic roller #741 234¢@50
Richard lee intercooler with Whippile 24fin per inch cupranickeal cores
Mooneyham 10-71 overdriven 15% to achieve 9lbs
15hrs
No idea what horsepower is never dynoed

Notice the amount I have to drive the blower just to get 9lbs
The restriction of the intercooler combined with cam duration, ported heads are most likely the reason. I would be interested in knowing my discharge air temp under the cooler.

Correct me if I'm am wrong isn't pump gas only good for 12-1 combined compression?

Keep the setups coming Guys!!!!!

Gerry

Re: How Much Boost????
 

Nice info here.http://www.kuhlsuperchargers.com/tech%20p05.htm

Re: How Much Boost????
 

8 - 1 comression
Ported Merlin Heads
509 Cu Inches
Crane Roller Cam & Roller Rockers
B & M 250 Blower, 7 lbs boost
Superchiller Intercooler
2 Nickerson-Built Holly 750's
MSD Ignition

Supposed to be around 700 HP

Re: How Much Boost????
 

I'm using a twin turbo setup.
7.5:1 static
20lbs boost
ported dart 360 heads
solid roller cam
modified superchiller intercooler
50 hrs

Re: How Much Boost????
 

check300,do you boat at hardy pond,i think you blew by me doin 90-95 last year,Smitty

Re: How Much Boost????
 

That was me....going there tomorrow.

Re: How Much Boost????
 

we were warmin boat up last year during mi hot boat assn. day,cruisin along about 60-you blew by- we could here them turbos!! I opened boat up to 83-84 mph and you walked away,,Smitty

Re: How Much Boost????
 

8.0 to 1 static compression
10.9psi manifold boost at 5600rpm
540cubic inch 4.5bore 4.25stroke
AFR CNC 335cc heads with Felpro gaskets (studs)
Crane hydraulic roller #741 234¢@50
M4 Procharger (8.5" lower pulley, 5" upper) with 504 procharger intercooler (soon will be changing to Rtech)
160hrs?
No idea what horsepower is never dynoed

Re: How Much Boost????
 

ttt


Come on Boost is your friend. :cool:

Post what you Got!!!!!!

Re: How Much Boost????
 

Static compression? 8.25
Boost pressure? 10lbs
Displacement? 540ci
Heads? AFR 357cc
Cam? ~265 DURATION @.50 .680 LIFT SOLID LIFTERS
Intercooled? Whipple
Type of supercharger? Quad rotor EFI Whipple
Engine Hours? 10Hrs

Made 1050Hp on the dyno, pump gas 93 octane

Re: How Much Boost????
 

8.5:1
7 lbs manifold with M3/504IC
Canfield/Valako heads
741 cam
Cometic head gaskets
FAST EFI

Re: How Much Boost????
 

Check300,

Can you post any pictures of that setup?
I'd love to see it.

John

Re: How Much Boost????
 

Theres gotta be more. :D


Keep them coming.

Re: How Much Boost????
 

Static compression? 8:1
Boost pressure? 6# goin to 7# next week
Displacement? 557ci
Heads? Canfield 350cc
Cam? Isky roller, 248*/258*-.607-.618,114*cl
Intercooled? nope...
Type of supercharger? 10-71 BlowerShop 4%OD
Engine Hours? 34hrs My total timing is 30*...should i be at 32* or more? when i got the boat back they where at 34* but my boost was only at 5# then. a few people told me to pull it back a bit.

Re: How Much Boost????
 

Got Boost?

Re: How Much Boost????
 

We have a customer who we build the engines for in a Daytona we run a 4.625 bore by 4.625 stroke the cyl heads are 125 cc and a flat top piston with one of our custom cams solid roller we run 9.5 lbs of boost with no inter cooler on 93 oct and run 119 mph at 5900rpm it is currently the fastest boat of its size in the Miami area. It has taken quite of work to make the combo work and its all in the cam we have had at least 5 cams before we had this one and I can tell you that the lobe sep has been the key. Ill give a clue its not from 110-114. Sincerely Laz Mesa

Re: How Much Boost????
 

622 cu inch?
I like to hear that screaming at 6000 rpm.

Re: How Much Boost????
 

Fastlane 40,Crate Gen VI 502's.8.75:1 ,5lb boost,850DP's,Aussie stainless exhaust,Weiand 177's,540 dyno HP.240 hours,not a problem.As a home engine builder and this type of set up where the guy at the wheel is the computer a exhaust mixture meter is invaluable.

Re: How Much Boost????
 

8.2 static compression
4-6 lbs boost
522 ci
Merlin heads 132cc's
Crane hydraulic roller
B&M 250
No Inter-cooler
300 plus hours
That's the power side of the engine
Here's the durability side
4340 billet crankshaft
Oliver billet rods
JE pistons
A.R.P fasteners
Merlin block
Machined by the best...Weston Machine
Assembled in a shop where time is not a problem...mine

Re: How Much Boost????
 

That's pretty amazing but I'd sure like to know what the charge air temperature is. Am I close and guessing that your lobe seperation is 116? I would also guess there isn't a carburator onboard either.. But those are just guesses.

Roby

Re: How Much Boost????
 

let me guess big spread between intake and exhaust with the exhaust profile being much larger than the intake

Re: How Much Boost????
 

I know its old..

Are your top pulleys the size of dimes?
Anyone else want to play?

Re: How Much Boost????
 

Numbers from a stock HP500EFI with Rtech system:

Static compression 8.8:1 (stock)
Boost pressure 7 psi
Displacement 502
Heads Stock GM iron unported
Cam Stock HP500EFI hydraulic roller
Intercooled Rtech supercooler
Type of S/C Vortech V-4
Engine Hours just installed

Re: How Much Boost????
 

Be easy on those cranks....BTW looks wicked, let us in on the dyno numbers.

Re: How Much Boost????
 

Static compression 8.1:1
Boost pressure 5 psi
Displacement 580"
Heads Merlin 345 w/ 126 CC chambers.
Cam: Lunati Hyd. Blower Cam (.571 - .580) the rest I'm not sure
8-71 Hampton Blower underdriven 5%
766 hp and 753 lbs. torque at 4500.

I went with a conservative setup for longevity but I could always pump up the boost if I want more juice. :eek:

Re: How Much Boost????
 

8.45 CR
Boost 5.00" pulley 10 lbs on 92 oct
4.75" pulley 12lbs on 92 oct
4.25" pulley 15 lbs on 92 oct
max tq @ +- 5400rpm, hp +-6700 rpm
12.2 A/F, 34 deg. timing, 72lbs injectors run @ 60 psi
Displacement 434ci chevy small block
AFR 227cc Heads
Cam Solid Roller [email protected]: in 258, ex 264, lift .648", .667", 112cl
EFI F.A.S.T. ECU
Procharger M3 504 Intercooler
Engine Hours 50

Re: How Much Boost????
 

598, 9 to 1, BB2 xtra, .750 solid roller, 276/ [email protected] Procharged, EFI. Ran octane booster above 10lb boost.

Re: How Much Boost????
 

Back4More: More details and dyno graph at:

http://www.offshoreonly.com/forums/s...ad.php?t=99521

GPM: Here's what your data looks like. Got to love that centrifugal torque curve all flat and stretched out by the linear boost curve. What about your new data? :evilb:

Re: How Much Boost????
 

TC, the new one's top secret.

Re: How Much Boost????
 

Oops! :D Didn't mean to let the cat out of the bag!

Re: How Much Boost????
 

The Cat busted out last year, just don't advertise it. It has been a long cold boring winter, a lot of spare time to feed the cat. PS. thanks for the graph.

Re: How Much Boost????
 

598ci
Brodix 3x cnc
775 lift solid cam
Whipple quad rotor with moac inbtercooler
11# boost, 93 oct, 1260hp
15# boost 112oct, 1370hp

Dustin said I probably left 100hp on the table, A/F never got above 11.3, and Brake specific 6.5. maybe to small of carbs 1050's

Re: How Much Boost????
 

I love that Tq curve of the 598!

Re: How Much Boost????
 

I'm still waiting to see some dyno sheets on those 1500 hp Whipple motors.

42MTI, wouldn't mind seeing your dyno sheet, it would be nice to compare, see how much more low end torque a Whipple makes, since we're running almost the same combo. Just curious, how many square inch is your intercooler, Procharger uses 648.

Re: How Much Boost????
 

TC, can you plot this one,12 rib blower belt started slipping and the power fell off, but the torque came in nice. I was thinking about trying a cog drive, and see what happens.

Re: How Much Boost????
 

GPM: Here you go. New data on the dotted lines. I haven't figured out how to put the boost numbers on the right side of the graph but the highest boost from the first test was 16 psi so you can scale it from there.

What overall blower drive ratios are we looking at with these two tests?