540CI builds, MAX RPM?
11-09-2014 | 09:31 PM
#22
Registered
Joined: Oct 2012
Posts: 1,332
Likes: 2
From: dfw texas
Last year I detuned a 540 with a 8-71 that was set to peak at 7900 rpm ,street car to marine duty ,had dart heads ,Merlin block ,quite a bit of run time and was wearing well .most people on the water will try to keep it well under 6k rpm though
11-10-2014 | 03:58 AM
#23
Registered
Joined: Aug 2011
Posts: 2,733
Likes: 8
From: bel air, md
I just don't see it happening at 6000 with those heads. Gonna need some Rpm to improve the VE with a set of heads like that.
11-10-2014 | 05:59 AM
#24
Thread Starter
Gold Member
Joined: Oct 2005
Posts: 11,692
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
Maybe I need to fully work the heads I got, of I can I'm gonna... I was informed the pro comp heads worked can flow some good air.... All depends the $$ I got to spend
11-10-2014 | 08:52 AM
#25
Registered
Joined: Jun 2012
Posts: 1,455
Likes: 1
From: OK CIty, OK
On a 4.25" stroke-
66ft/s is ~5600rpm
82.5ft/s (roughly what a nascar mill spins) is ~7000rpm
Here's a kick ass chart showing the numbers for two high performance engines. Yours will spin slower, but proportionally so.
66ft/s is ~5600rpm
82.5ft/s (roughly what a nascar mill spins) is ~7000rpm
Here's a kick ass chart showing the numbers for two high performance engines. Yours will spin slower, but proportionally so.
Last edited by Cole2534; 11-10-2014 at 09:02 AM.
11-10-2014 | 10:30 AM
#26
Registered
Joined: Feb 2004
Posts: 4,909
Likes: 9
From: Northeast,Fla
These are some of Bob Madara's words to me when I was considering building a 540ci . Coming from Bob you can take these words as gospel . " Your 700 hp target , from a 540ci displacement platform is absolutely doable . The majority of our 540 engine platforms are all dynoing between 685 and 725 hp , under 6000 rpm . The key components in making your target are going to be the induction system , cylinder heads and valve train . " I hope this helps to answer your question with information straight from the horses mouth .
11-10-2014 | 04:26 PM
#30
Thread Starter
Gold Member
Joined: Oct 2005
Posts: 11,692
Likes: 217
From: Olmsted Falls,Ohio Marblehead,Oh
Hard to read Rob, any clearer pic?
Looks like you hit 700hp well before 6000? so anything in the 5500-6000 range is doable if parts are right... unless the fuzz is that fuzzy lol
Looks like you hit 700hp well before 6000? so anything in the 5500-6000 range is doable if parts are right... unless the fuzz is that fuzzy lol
