Boatmad.com


Reply
 
Thread Tools Display Modes
 
Old 19-11-2005, 01:55 AM   #1
Large member
 
Country: England
Location: On the farm
Occupation: General Trouble Causer Salterns Boatyard
Interests: Official smartass
Boat name: Seahorse.org
Boat make: a V24 and a SLOW unstable ICE Bladerunner
Engines: 2x300 promax, 320 Volvo
Cruising area: England/France & Med

Join Date: May 2005
Location: On the farm
Posts: 2,681
Power upgrade for 300 promax

Friend of a friend of a friend does work with racing boat engines. He recons he can replace the reeds on the 300 promax, add a new chip, grind the ports and it will be able to rev to 7200 and produce 330hp.

What are your thoughts?

Something interesting. If the engine overrevs ( like when you leave the water ) the chip dumps in too much fuel to cut the power, rather than shutting off the fuel. Aparently this stops lean burn and actually lubricates the engine at these high revs.

Again, your thoughts?
__________________

verytricky is offline   Reply With Quote
Old 19-11-2005, 10:02 AM   #2
Registered User
 
roofer's Avatar
 
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2

Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
Have a look on www.simonmotorsports.com he reckons 335 reliable hp from a 3.0 .
__________________

__________________
PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
roofer is offline   Reply With Quote
Old 24-11-2005, 07:33 PM   #3
Registered User
 
simonmotorsports's Avatar
 
Country: usa
Location: Ramona Ca.
Boat make: 30' Cobra

Join Date: Nov 2005
Location: Ramona Ca.
Posts: 3
This combo is the best that I have found:

Simon Motorsports balanced light flywheel
Mad efi intake
Mad exhaust tuner
Re-curved ECU's
New coils and plug wires
Simon Motorsports billet heads (64cc)

This combo makes 335 with 91 octane (R+M/2).
Attached Thumbnails
Click image for larger version

Name:	335front.jpg
Views:	1108
Size:	78.5 KB
ID:	6221  
__________________
www.simonmotorsports.com
simonmotorsports is offline   Reply With Quote
Old 24-11-2005, 07:39 PM   #4
Registered User
 
roofer's Avatar
 
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2

Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
How much does that weigh? Is the gearbox standard? how much to buy and ship one over here ?
__________________
PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
roofer is offline   Reply With Quote
Old 24-11-2005, 07:56 PM   #5
Registered User
 
simonmotorsports's Avatar
 
Country: usa
Location: Ramona Ca.
Boat make: 30' Cobra

Join Date: Nov 2005
Location: Ramona Ca.
Posts: 3
I have different combos of motors. It depends on what you are trying to do with it. The lightest 335 so far is 410 lb's. A 2.5 offshore wieghs 400 lb's. This is a dyno sheet with an svs and stock heads. The setup I do now makes at least 15hp more.
Attached Thumbnails
Click image for larger version

Name:	33013.jpg
Views:	397
Size:	23.4 KB
ID:	6222  
__________________
www.simonmotorsports.com
simonmotorsports is offline   Reply With Quote
Old 24-11-2005, 08:03 PM   #6
Registered User
 
roofer's Avatar
 
Location: GOLDEN MILE
Boat name: LILY THE PINK AND TERMINATOR 11
Boat make: PHANTOM 21 AND 20
Engines: 2.5 EFI X 2

Join Date: Mar 2004
Location: GOLDEN MILE
Posts: 2,475
Mid range torque looks very impressive, how does acceleration and top end compare to 2.5efi? and how does gearbox hold up? would it be more reliable than efi in race conditions?
__________________
PLEASE DON'T STEAL...THE GOVERNMENT DON'T LIKE THE COMPETITION
roofer is offline   Reply With Quote
Old 25-11-2005, 10:47 AM   #7
Large member
 
Country: England
Location: On the farm
Occupation: General Trouble Causer Salterns Boatyard
Interests: Official smartass
Boat name: Seahorse.org
Boat make: a V24 and a SLOW unstable ICE Bladerunner
Engines: 2x300 promax, 320 Volvo
Cruising area: England/France & Med

Join Date: May 2005
Location: On the farm
Posts: 2,681
What do you think about:

lightened conrods?
lightweight pistons?
single ring pistons?

lightened flywheel?
__________________

verytricky is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 Off
Pingbacks are Off
Refbacks are Off


Powered by vBadvanced CMPS v3.2.3

All times are GMT +1. The time now is 06:21 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
×