Like Tree0Likes

5oo Hp 7 Psi Too Much

Reply
Old 01-17-2006, 02:08 PM
  #11
Registered
 
Join Date: Jan 2005
Posts: 185
Default Re: 5oo Hp 7 Psi Too Much

Yup, Griff got it. JcPerf made a funny As to how much overdrive chad can handle, the only way to know is to put an IAT sensor in and monitor knock as well. The lack of an intercooler concerns me when you start speeding up a roots blower
RichardCranium572 is offline  
Reply With Quote
Old 01-17-2006, 05:53 PM
  #12
Registered
 
redfountain420s's Avatar
 
Join Date: Jul 2004
Posts: 151
Default Re: 5oo Hp 7 Psi Too Much

chad,
im running twin hp500 efi long blocks with 420 mega blowers and nickerson/holley 750s with 5 lbs boost, it is very dependable and reliable at 5lbs . when i first put it together last year i had the pulleys switched and it made 8-9 lbs boost and i had too much timing and i had to put head gaskets on it after the first time out on one motor and eventually the second motor . i put the felpro hp marine gaskets on it after that i put 30 hrs onit and it runs great. i cant afford to break it so im leaveing it at 5lbs
kevin
ps what size pulleys do you have on your 420 , you could change a tooth and get up to 5lbs
Attached Thumbnails
5oo Hp  7 Psi  Too Much-motors-boat2.jpg  
redfountain420s is offline  
Reply With Quote
Old 01-17-2006, 05:55 PM
  #13
Gold Member
Gold Member
 
Hydrocruiser's Avatar
 
Join Date: May 2004
Posts: 5,759
Arrow Re: 5oo Hp 7 Psi Too Much

Quote:
Originally Posted by chad1
Stock 500 Hps B&m 420 Mega Blowers 93 Octane..can This Setup Handle 7psi . Go From 4 To 7 By Reversing The Pullys.. No Inercooler...
..at that boost you won't need to worry about hitting 20 hours and needing an oil change,,,
Hydrocruiser is offline  
Reply With Quote
Old 01-17-2006, 05:58 PM
  #14
Registered
 
Back4More's Avatar
 
Join Date: Feb 2002
Location: Lake Michigan
My Boats: 353 Fastech
Posts: 6,624
Default Re: 5oo Hp 7 Psi Too Much

5psi would be the most I would run...I know of someone running 8-71's at 6-7psi on their 540 BullDogs, and they have been replacing head gaskets almost every mid to end of each summer.
Back4More is offline  
Reply With Quote
Old 01-17-2006, 06:52 PM
  #15
Rob
VIP Member
Trade Score: (6)
 
Strip Poker 388's Avatar
 
Join Date: Aug 2001
Location: Madison,Mississippi
My Boats: Hustler 388
Posts: 21,567
Default Re: 5oo Hp 7 Psi Too Much

Like there saying with no innercooler becarefull.

On my Whipple 500efi I have been running it at 10lbs boost for the last 5 hours .7 all summer
__________________
.

The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
Strip Poker 388 is offline  
Reply With Quote
Old 01-17-2006, 08:56 PM
  #16
Registered
 
JCPERF's Avatar
 
Join Date: Jul 2004
Location: Long Island,New York
My Boats: 10 foot Kayak
Posts: 8,908
Default Re: 5oo Hp 7 Psi Too Much

Quote:
Originally Posted by Strip Poker 388
Like there saying with no innercooler becarefull.

On my Whipple 500efi I have been running it at 10lbs boost for the last 5 hours and Drunk all summer
JCPERF is offline  
Reply With Quote
Old 01-17-2006, 09:54 PM
  #17
Registered
Thread Starter
 
Join Date: Jul 2003
Location: TEXAS
My Boats: 32 SPECTRE
Posts: 319
Default Re: 5oo Hp 7 Psi Too Much

this setup is going in a friends 30 spectre...we have the pullys set for 4 psi..thanks for the input...i will let you know what happens...it ran 102 mph before....
chad1 is offline  
Reply With Quote
Old 01-18-2006, 12:21 AM
  #18
Rob
VIP Member
Trade Score: (6)
 
Strip Poker 388's Avatar
 
Join Date: Aug 2001
Location: Madison,Mississippi
My Boats: Hustler 388
Posts: 21,567
Default Re: 5oo Hp 7 Psi Too Much

Is adding a innercooler a option?
__________________
.

The Only Time You Have To Much Ammo Is When Your Swimming Or On Fire.
Strip Poker 388 is offline  
Reply With Quote
Reply

Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
custom29scarab
General Q & A
4
08-08-2005 03:47 PM
gripit
General Q & A
6
12-11-2004 06:18 PM
CSIHH
General Q & A
3
04-08-2004 06:16 PM
DigDeep
General Q & A
4
09-15-2003 11:18 PM
Mad Hatter
General Boating Discussion
6
08-11-2003 12:55 AM



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 08:09 PM.


Copyright 2011 OffShoreOnly. All rights reserved.