Cam Suggestions for a 540
11-29-2015, 09:48 PM
#161
Platinum Member
Platinum Member
iTrader: (1)
540 CI AFR325's cam is 241/246 681/663 112, 9.6:1 compression single plane with 1050 carbs (4150) style, did not dyno but results in boat were no gains, so I really and trying to see whats wrong with the combo, I was assured easily 680++ hp and TQ, my old ones were 598 hp and 663TQ so I am baffled.. I am just getting specs from different combos from guys that seemed like success...
Last edited by articfriends; 11-29-2015 at 11:46 PM.
11-29-2015, 11:50 PM
#162
Platinum Member
Platinum Member
iTrader: (1)
I am dynoing this same 540 on dyno in my own shop in next few weeks in normally aspirated configuration, the 315 afr heads are slightly different (been ported even more) and cam is even bigger, even less than ideal for a normally aspirated motor but I want to see what current hp is, I will post numbers. Will be testing a even bigger throttle body too, Smitty
11-29-2015, 11:59 PM
#163
Registered
iTrader: (3)
I am dynoing this same 540 on dyno in my own shop in next few weeks in normally aspirated configuration, the 315 afr heads are slightly different (been ported even more) and cam is even bigger, even less than ideal for a normally aspirated motor but I want to see what current hp is, I will post numbers. Will be testing a even bigger throttle body too, Smitty
11-30-2015, 12:07 AM
#164
Platinum Member
Platinum Member
iTrader: (1)
Soon as the 540 is dynoed N/A the heads and modified MPI intake are coming off, intake is going on my econo/mild build 502 (I just finished building long block on) that I'm dynoing next then putting in my 272 Baja to sell in spring. The heads and a second pair being built identical to them are going on my hp 500 efis out of my 33 scarabt along with cams, intake work etc. Got alot of projects going on with my own motors this winter!
11-30-2015, 05:10 AM
#165
Registered
1987 sonic 36 ss. Trs drives 25 mirage plus , davis distributor, stainles marine exhaust wet, 76 at 5300. Crossover, blocked bypass, no thermostat on water, 15 / 18 psi, water temp 100 / 120 max, been 83 with 4 blade hyd q4 s 27p , but rpm 4700, broke prop shaft and housing.
Uses 60 gallons on 78 mile non stop 3/4 full the whole way. Best thing motors were cheap and dont run hot or so much as tick. 7/8 fuel pressure. Holley pump nmechanical. The carbs were 1200 each but well worth it
Uses 60 gallons on 78 mile non stop 3/4 full the whole way. Best thing motors were cheap and dont run hot or so much as tick. 7/8 fuel pressure. Holley pump nmechanical. The carbs were 1200 each but well worth it
11-30-2015, 05:13 AM
#166
Registered
I am dynoing this same 540 on dyno in my own shop in next few weeks in normally aspirated configuration, the 315 afr heads are slightly different (been ported even more) and cam is even bigger, even less than ideal for a normally aspirated motor but I want to see what current hp is, I will post numbers. Will be testing a even bigger throttle body too, Smitty
my friend is actually giving me his old set up,i'm getting excited to get it.Of course the latest software is gonna be fun to buy.
11-30-2015, 05:33 AM
#167
Gold Member
Gold Member
iTrader: (5)
Join Date: Oct 2005
Location: Olmsted Falls,Ohio Marblehead,Oh
Posts: 11,634
Likes: 0
Received 204 Likes
on
132 Posts
Ray said head chambers were right on, was all calculated by bob to be 9.6, when compression test was done averaged 165, all were within a few PSI.
11-30-2015, 05:37 AM
#168
Gold Member
Gold Member
iTrader: (5)
Join Date: Oct 2005
Location: Olmsted Falls,Ohio Marblehead,Oh
Posts: 11,634
Likes: 0
Received 204 Likes
on
132 Posts
Seem similar boat I am mistress 25 mirage plus spinning 5500 was best at 73.7 with old engines this year best was. 73.2 with new engines that I expected to be more, I know it takes power to push my boat. I was told identical builds to mine made 716 hp and 693tq at 6000 with 4500 doninators. I can't fit them under hatch so I went 1050 (4150) carbs but they are not robbing 100+ ho per emgine that's for sure
1987 sonic 36 ss. Trs drives 25 mirage plus , davis distributor, stainles marine exhaust wet, 76 at 5300. Crossover, blocked bypass, no thermostat on water, 15 / 18 psi, water temp 100 / 120 max, been 83 with 4 blade hyd q4 s 27p , but rpm 4700, broke prop shaft and housing.
Uses 60 gallons on 78 mile non stop 3/4 full the whole way. Best thing motors were cheap and dont run hot or so much as tick. 7/8 fuel pressure. Holley pump nmechanical. The carbs were 1200 each but well worth it
Uses 60 gallons on 78 mile non stop 3/4 full the whole way. Best thing motors were cheap and dont run hot or so much as tick. 7/8 fuel pressure. Holley pump nmechanical. The carbs were 1200 each but well worth it
11-30-2015, 06:14 AM
#169
Platinum Member
Platinum Member
iTrader: (1)
Norm schenk of competition fuel systems relocated from Tuscon arizona to my town, he owns a gopower 750 dyno thats been upgraded to hold about 950 hp, he installed his dyno in my shop and i get his carburetor expertise and use of the dyno in exchange for shop space im giving him. He has done developmental work for stromberg and various people thru the years such as david Vizard on this dyno, only drwaback is it wont hold enough tq to dyno 1000 ft lb tq blower motors. Uses depac software, since setting it up he has dynoed his mule motor SBC on it within 3 hp of what it made 2 years ago in arizona and on several pulls over several days its repeated same results so looks like will be a good deal all around.
