Like Tree0Likes

Can I just drop a blower on my 540's????

Reply
Old 10-30-2009, 06:23 PM
  #21
Registered
 
blue thunder's Avatar
 
Join Date: Nov 2001
Location: Pennsylvania
My Boats: 330 Carver 30' Scarab Panther 17' ProV Lund
Posts: 3,359
Default

I run 9.5:1 static w/5# boost, alum heads and 93 octane. It will run well for you as long as the blower is spinning 10k+rpm and you do the alum heads.

Last edited by blue thunder; 10-30-2009 at 06:34 PM.
blue thunder is offline  
Reply With Quote
Old 10-30-2009, 10:06 PM
  #22
Registered
 
AIR TIME's Avatar
 
Join Date: Dec 2000
Location: EASTON MA.
My Boats: BAJA OL 650HP/ SABER 28 Gellner unlimited with konrad ace
Posts: 6,281
Default

Quote:
Originally Posted by 302Sport View Post
ok i guess ill have to get all of the engine specs before i can even think about it....ive seen guys on here saying they took their 540's and put blowers on them without any further mods
must of been tall decks 10.2 alum heads, 8.75 to 1 cmp. you could get 600 to 650 hp out of those talk to Dean Gellner.
AIR TIME is offline  
Reply With Quote
Old 10-31-2009, 08:46 AM
  #23
Registered
 
blue thunder's Avatar
 
Join Date: Nov 2001
Location: Pennsylvania
My Boats: 330 Carver 30' Scarab Panther 17' ProV Lund
Posts: 3,359
Default

Quote:
Originally Posted by AIR TIME View Post
must of been tall decks 10.2 alum heads, 8.75 to 1 cmp. you could get 600 to 650 hp out of those talk to Dean Gellner.
There are charts that show static compression and how much boost you can apply safely with cast heads and pump gas. Usually a total compression of around 12:1 would be max. This is around 4-5psi for your engine. So you could do it safely but would not be able to turn up the boost too high. Wieand has the charts on the holley website. FYI - the aluminum heads would let you put a little more boost to it, 12.5-13:1 safely. So you don't have to run aluminum but it is a good hedge against detonation.
blue thunder is offline  
Reply With Quote
Old 01-19-2010, 12:25 PM
  #24
Registered
Thread Starter
 
Join Date: Oct 2005
Location: Plainville/Old Lyme, CT Boca Raton, FL
My Boats: 37 Active thunder 700/NXT / 40 Intrepid Trip 350 Yammy's
Posts: 5,457
Default

just found out my cr is 8.8 to 1 and was a gen 5 or 6 502 to start, and is now a 540. I was told to run a 871 or bigger with an intercooler to keep the air cool, and only like 4 pounds of boost and it should live...........what do yall think???
302Sport is offline  
Reply With Quote
Old 01-19-2010, 09:36 PM
  #25
Registered
 
AIR TIME's Avatar
 
Join Date: Dec 2000
Location: EASTON MA.
My Boats: BAJA OL 650HP/ SABER 28 Gellner unlimited with konrad ace
Posts: 6,281
Default

Quote:
Originally Posted by 302Sport View Post
just found out my cr is 8.8 to 1 and was a gen 5 or 6 502 to start, and is now a 540. I was told to run a 871 or bigger with an intercooler to keep the air cool, and only like 4 pounds of boost and it should live...........what do yall think???
you need a intercooler also, my motor 572 will be 8.4 to 1 cooler with alum heads 1071 shooting for 1050hp plus, call Dean Gellner
AIR TIME is offline  
Reply With Quote
Old 01-19-2010, 10:29 PM
  #26
Gold Member
Gold Member
 
tfarmer's Avatar
 
Join Date: Jan 2006
Location: Gilbertsville, Ky
My Boats: 37 Active Thunder
Posts: 490
Default

[QUOTE=302Sport;3027086]just found out my cr is 8.8 to 1 and was a gen 5 or 6 502 to start, and is now a 540. I was told to run a 871 or bigger with an intercooler to keep the air cool, and only like 4 pounds of boost and it should live...........what do yall think???[/QUOTE
To start off with a Blower motor is a Blower motor and a n/a
motor is a n/a motor from the start of your plans to build.
I find this thread interesting because that is exactly what Im into now.
First off you must remove the cranks and have a 1/4 key added 180 away from your 3 1/6 key for the blower hub. If not the pull on the small factory key will brake and more than likely is will ruin the crank snoutt before you get it shut down.
7.4 to 8.4 is a good compression to look at doing. Reverse
domb(maby 20cc) blower piston and a H-BEAM RODS for sure. You dont need to spend a ton of money on the heads because the blower is going to make the power for the head.
Edelbrock makes a nice marine head for the money.The block will be fine. Your cam needs to be for a blower app. At the least your valve springs have to be set up for the compressed air comming from the upper side. The air speed is going to be charged and will put more weight on the top side of the valve. With this you may want to step up the spring rate. The fuel system will have to be completely changed. Boost referenced carbs is a must. The Ignition system has to have a boost retard. I like to drop 1.5 deg.
per pound of boost. If you dont do this you will kill your engines.
You will fall in love the first time out but they wont last long.
Here is my port engine. I was going to install blowers on the 502s and go. Just like you are wanting to do. And over $50,000 later in parts alone I have Dart 540 Blower Motors .
I hope this helps.
Attached Thumbnails
Can I just drop a blower on my 540's????-dsc02579.jpg  
tfarmer is offline  
Reply With Quote
Old 01-19-2010, 10:46 PM
  #27
Gold Member
Gold Member
 
tfarmer's Avatar
 
Join Date: Jan 2006
Location: Gilbertsville, Ky
My Boats: 37 Active Thunder
Posts: 490
Default

[QUOTE=tfarmer;3027570]
Quote:
Originally Posted by 302Sport View Post
just found out my cr is 8.8 to 1 and was a gen 5 or 6 502 to start, and is now a 540. I was told to run a 871 or bigger with an intercooler to keep the air cool, and only like 4 pounds of boost and it should live...........what do yall think???[/QUOTE
To start off with a Blower motor is a Blower motor and a n/a
motor is a n/a motor from the start of your plans to build.
I find this thread interesting because that is exactly what Im into now.
First off you must remove the cranks and have a 1/4 key added 180 away from your 3 1/6 key for the blower hub. If not the pull on the small factory key will brake and more than likely is will ruin the crank snoutt before you get it shut down.
7.4 to 8.4 is a good compression to look at doing. Reverse
domb(maby 20cc) blower piston and a H-BEAM RODS for sure. You dont need to spend a ton of money on the heads because the blower is going to make the power for the head.
Edelbrock makes a nice marine head for the money.The block will be fine. Your cam needs to be for a blower app. At the least your valve springs have to be set up for the compressed air comming from the upper side. The air speed is going to be charged and will put more weight on the top side of the valve. With this you may want to step up the spring rate. The fuel system will have to be completely changed. Boost referenced carbs is a must. The Ignition system has to have a boost retard. I like to drop 1.5 deg.
per pound of boost. If you dont do this you will kill your engines.
You will fall in love the first time out but they wont last long.
Here is my port engine. I was going to install blowers on the 502s and go. Just like you are wanting to do. And over $50,000 later in parts alone I have Dart 540 Blower Motors .
I hope this helps.
Sorry, That picture is my 502s Here is the new 540.
Attached Thumbnails
Can I just drop a blower on my 540's????-dsc02610.jpg  
tfarmer is offline  
Reply With Quote
Old 01-19-2010, 10:56 PM
  #28
Registered
 
Back4More's Avatar
 
Join Date: Feb 2002
Location: Lake Michigan
My Boats: 353 Fastech
Posts: 6,624
Default

4 psi of boost out of an 8-71 won't need an innercooler.
Back4More is offline  
Reply With Quote
Old 01-20-2010, 08:30 AM
  #29
Registered
Thread Starter
 
Join Date: Oct 2005
Location: Plainville/Old Lyme, CT Boca Raton, FL
My Boats: 37 Active thunder 700/NXT / 40 Intrepid Trip 350 Yammy's
Posts: 5,457
Default

i agree it doesnt need it, but from what everybody tells me, it is nice to have.......
302Sport is offline  
Reply With Quote
Old 01-20-2010, 09:15 AM
  #30
Platinum Member
Platinum Member
 
Join Date: Nov 2000
Location: PA USA
My Boats: Fast Boats , Fast Cars
Posts: 1,417
Default

If you decide to run an intercooler you will need to run at least 5-6 pounds to compensate for the intercooler. At 4 pounds of boost is really nothing also, don't forget it takes hp to spin that blower.
baja27 is offline  
Reply With Quote
Reply



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 09:58 PM.


Copyright 2011 OffShoreOnly. All rights reserved.