anyone DIY 540 build up?
12-19-2005, 09:46 AM
#22
Beak botr
VIP Member
Join Date: Dec 2003
Location: Cape Coral
Posts: 891
Likes: 0
Received 0 Likes
on
0 Posts
Re: anyone DIY 540 build up?
getting parts together for one at this time. Dart big M, forged 4.25, forged JE 9.4:1, Crane 731, Caveman's full port Merlins, IMCO Powerflow Ex., for pleasure, need intake and carb recommendation?
12-19-2005, 05:16 PM
#23
I hate the winter!!
Platinum Member
Join Date: Jul 2001
Location: long island, new york
Posts: 2,707
Likes: 0
Received 0 Likes
on
0 Posts
Re: anyone DIY 540 build up?
88fount33,
I had been debating the intake last year when I built my motor. I was sitting on the fence between an oval or square port intake. I started a thread here last year on this. There is alot of good information on this .
http://www.offshoreonly.com/forums/s...rt+rectangular
I had been debating the intake last year when I built my motor. I was sitting on the fence between an oval or square port intake. I started a thread here last year on this. There is alot of good information on this .
http://www.offshoreonly.com/forums/s...rt+rectangular
12-19-2005, 05:36 PM
#25
I hate the winter!!
Platinum Member
Join Date: Jul 2001
Location: long island, new york
Posts: 2,707
Likes: 0
Received 0 Likes
on
0 Posts
Re: anyone DIY 540 build up?
Originally Posted by racinfever
oval port heads are for cabin cruisers ! rectanular are for speed boats. 
I think you misread my post. I was talking about oval port intakes.
12-19-2005, 06:15 PM
#27
I hate the winter!!
Platinum Member
Join Date: Jul 2001
Location: long island, new york
Posts: 2,707
Likes: 0
Received 0 Likes
on
0 Posts
Re: anyone DIY 540 build up?
Originally Posted by racinfever
same deal!
12-19-2005, 07:50 PM
#28
Registered
Re: anyone DIY 540 build up?
Originally Posted by racinfever
oval port heads are for cabin cruisers ! rectanular are for speed boats.
Not quite sure I would agree with that.
What rpms do you want your peak torque to come in at?
Oval port create higher port velocity. Flatter torque curve.
I would say under 5000rpm.
Rectangular port creates more of a peak curve.
lower velocity moving more air.
Capable of much higher then 5000rpm.
In short these are very broad statements as well.
Its all in the combos as demostrated in this post.
Stick with a proven combo!
Stay tuned as we try to get 1200 ponines out of 557's
with Dart pro 1 18 degree heads
Gerry
Last edited by caveman; 12-19-2005 at 08:41 PM. Reason: I got issues
12-24-2005, 07:44 PM
#29
Registered
Join Date: Oct 2000
Location: Simpsonville, SC 29680
Posts: 653
Likes: 0
Received 0 Likes
on
0 Posts
Re: anyone DIY 540 build up?
Eldebrock RPM heads with Team G intake, full port and polish by Champion Marine. Intake port matched
10.1 comp
741
850 barry grant 920 cfm
1.9" and 2.3" valves
CMI's
sheet is dyno room headers w/o acc
purrs like a kitty at idle
would idle a t 500 r's if I would let it
no in and out of gear issues at all
do have a pressure relief valve due to the crossover
Gary Grimes speced out the part and put on his relief valve
Put over 300 hrs on it and tore it down this spring with no issues.
10.1 comp
741
850 barry grant 920 cfm
1.9" and 2.3" valves
CMI's
sheet is dyno room headers w/o acc
purrs like a kitty at idle
would idle a t 500 r's if I would let it
no in and out of gear issues at all
do have a pressure relief valve due to the crossover
Gary Grimes speced out the part and put on his relief valve
Put over 300 hrs on it and tore it down this spring with no issues.
12-24-2005, 08:42 PM
#30
Banned
Re: anyone DIY 540 build up?
Originally Posted by racinfever
oval port heads are for cabin cruisers ! rectanular are for speed boats.
