Like Tree0Likes

Engine builders check in!!! Supercharging 454's

Reply
Old 08-08-2002, 05:04 PM
  #1
Registered
Thread Starter
 
X-Rated30's Avatar
 
Join Date: Mar 2001
Location: Monroe, LA
My Boats: 1997/2010 Spectre Catamaran w/ twin 250XS Sports
Posts: 3,882
Default Engine builders check in!!! Supercharging 454's

I originally posted this on the tech board, but not enough input, so here goes again:

Last year I replaced gen IV 454/425's with new gen VI 454/425's. They don't seem to have quite the bump I wanted, but are definitely adequate. (Have gotten mid 70's gps.)

The new motors are the 454HO crate motors from GM performance. They have hydraulic roller lifters, and compression is 8.75:1. Heads are cast iron rectangular port 118cc.

I am toying with the idea of supercharging them. I don't want to destroy the motors, and I thought a slower turning larger blower might be the way to do it. (420 Megablower, 8-71 Weiand, etc. at 80%)

I have two questions:

1) should I supercharge these motors at all? If so, what if anything would I need to change inside the motor.

2) what kind of blower/setup would you suggest?
X-Rated30 is offline  
Reply With Quote
Old 08-08-2002, 09:40 PM
  #2
speel chekk this fokker!
Charter Member
 
puder's Avatar
 
Join Date: Feb 2001
Location: Locust Valley, New York
My Boats: 27' Scarab
Posts: 5,329
Default

you coudl use smaller blowers and turn them at normal speed and make good power. My engine dynoed at 540hp witha b&m 174 making 5psi of boost. It was biult on a 454mag. Iconel exhaust valves, slightly hotter cam than a 525sc. WIth only 5psi boost it shoudl run for quieta while and be pretty reliable.
__________________
Pardon me, while I whip this out!
puder is offline  
Reply With Quote
Old 08-08-2002, 10:07 PM
  #3
Platinum Member
Platinum Member
Trade Score: (1)
 
KAAMA's Avatar
 
Join Date: Oct 2000
Location: Western Michigan
My Boats: A boat?....What boat??? How about a galvarnized warsh tub wit a toranady strapped own da rear!
Posts: 4,329
Default

If nobody else responds and you REALLY want honest answers to your questions about a blower set up call Bruce Wolff. He usually doesn't mind helping people get started in the right direction and the guy is gifted at tuning stuff and getting it dialed in. 616-422-1090
KAAMA is offline  
Reply With Quote
Old 08-08-2002, 10:36 PM
  #4
flylevel
Guest
 
Posts: n/a
Default

I'm leaning toward a whipple charger on a 502 block. EFI is a must, good set of headers. Going to try and follow the 575sc setup with a little more mid range torque. Should end up around 650 hp. But a friend of mine keeps reminding me that there is no substitution for cubic dollars(oops cubic inches)
 
Reply With Quote
Old 08-08-2002, 10:44 PM
  #5
Registered
 
Pure Energy's Avatar
 
Join Date: Oct 2000
Location: N. NJ, Eastern LI
My Boats: 2001 Superboat Y2K
Posts: 3,027
Default

Kaama,

Just an observation, but you are really pushing Bruce in alot of your responses. Not that it is bad, but almost too much. I know that he has contributed alot to this board and has alot to offer.
Pure Energy is offline  
Reply With Quote
Old 08-09-2002, 12:29 AM
  #6
Registered
Thread Starter
 
X-Rated30's Avatar
 
Join Date: Mar 2001
Location: Monroe, LA
My Boats: 1997/2010 Spectre Catamaran w/ twin 250XS Sports
Posts: 3,882
Default

Is this the same Bruce that everyone had trouble with like Kook and Dave? I don't mind if it is, but I WOULD want to know.
X-Rated30 is offline  
Reply With Quote
Old 08-09-2002, 01:10 AM
  #7
Platinum Member
Platinum Member
 
Quiet Storm's Avatar
 
Join Date: Apr 2002
Location: Lake Michigan
Posts: 1,683
Default

Bruce did a great job of dialing in my Whipples. He spent alot of time putting the boat in the water to find the right setup. He understands blowers and how to make them work. Other guys just foul plugs and scratch their heads. Thats what I was doing before he was recommended to me. He doesn't have a problem letting you know what he thinks either. Good luck with it.
Quiet Storm is offline  
Reply With Quote
Old 08-09-2002, 02:02 AM
  #8
Platinum Member
Platinum Member
Trade Score: (1)
 
KAAMA's Avatar
 
Join Date: Oct 2000
Location: Western Michigan
My Boats: A boat?....What boat??? How about a galvarnized warsh tub wit a toranady strapped own da rear!
Posts: 4,329
Default

The "Bruce" that I am refering to is NOT Bruce Dudley who has been on this board in the past and lives in MO. The "Bruce" I am talking about is Bruce Wolff, a marine engine builder who's shop is in S.W. Michigan and is not a member of this forum. I know---I guess I sound like a broken recording and have been mentioning his name a lot, but so many people come on here and ask questions and are looking for answers and really want a straight answer. Not that others on this board or outside of this forum can't help a person out with their knowledge and experience, but if these people really have a problem that they are serious about and really need an answer, I guess I'm only trying to be helpful by suggesting a person who does this stuff professionally and who is good at it. I have also mentioned "Doctor Dave" (OSO board member). Not that someone else can't help them, but I personally know these guys, therefore I guess it makes it too easy for me to mention their name.

Quiet Storm, are you the guy with the 28' Checkmate that took his boat to Wolff?
KAAMA is offline  
Reply With Quote
Old 08-09-2002, 05:31 AM
  #9
Registered
 
timucin's Avatar
 
Join Date: May 2002
Location: istanbul
Posts: 1,577
Default

if I were you I would go for:
8.71 charger
charger cam
msd boost retard electronics ( a must)

I can make a detailed list of components ;necessary for adding a blower with part numbers,if you are interested .

note: I am not a professional engine builder
timucin is offline  
Reply With Quote
Old 08-09-2002, 08:32 AM
  #10
Platinum Member
Platinum Member
 
Quiet Storm's Avatar
 
Join Date: Apr 2002
Location: Lake Michigan
Posts: 1,683
Default

Kaama,

Thats me.
Quiet Storm is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
nocigarette
General Q & A
33
01-02-2008 08:12 PM
OldSchool
General Boating Discussion
31
07-03-2005 03:46 PM
WTC
General Boating Discussion
1
05-01-2003 06:07 PM
X-Rated30
General Q & A
7
08-09-2002 08:01 PM



Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -5. The time now is 10:53 PM.


Copyright 2011 OffShoreOnly. All rights reserved.