|
Originally Posted by getrdunn
(Post 4466864)
Without a doubt a nice reliable package however like SB said there is definitely power left on the table however for now I'd keep the oil changed and have fun. The 139661 cam is going to make most hp near 6,400-6,600. What do you have it propped for at WOT? The dyno sheet contradicts this especially showing peak torque at 4,650. I've personally not seen a dyno sheet like this with the rpm's not being sequential. SB what happened in the scribbled out area? I can see where the split is but why would this not be making more hp at 5,700? Is cam installed 8 deg adv? Lol. To OP I am just trying to figure this out and have it make sense with me. Cam vs hp. I am jealous of your find. Haven't heard one of these in a while. Similar to 68 Shelby found in old lady's barn out in the country on a gravel road. Ha. Congrats. I am happy for you.
Last 572 a buddy built , NA, AFR 335 CNC heads, with a 252* hyd roller, was done making power at 6 grand. Peak torque was right at 4600. This engine, had CNC ported heads, dominator carb, 454 R intake with mods, etc. Looks to me like this cam he has, isn't all that big for the combo. |
Crane Hydraulic Roller Cam #139661 : Advertised Duration 318°/326° , at .050 256°,264° , lift with 1.7 rockers .632", .632" , Lobe Separation Angle 114°
|
with a quick Google search it now even makes more sense. It's kinda like yes I get it but I don't get it. Lol Regardless 20 years ago or not. i haven't had much experience with these tuned port intakes but it would seem they they are definitely lacking cfm. Still making good power at low rpm but in my world it would be like putting restricter plates on well tuned carbed 572's. What I did find unique though was that the zz572 with 850 cfm carb and signed plane intake makes like 620 hp with nearly identacle cam however at 6k. So in a nutshell OP has kind of a unique package. Just lacking about 700 cfm.
|
Prob with a better intake and heads, the engine would keep making power longer/higher, with that cam.
|
Originally Posted by MILD THUNDER
(Post 4466949)
Keep in mind, this is a 575 cubic inch mill, with mediocre merlin heads. It prob isn't gonna rev to 6000 making power with a 240* duration cam, and the rest of the setup.
I'll take a pic of the sheet later. |
Originally Posted by getrdunn
(Post 4466864)
Without a doubt a nice reliable package however like SB said there is definitely power left on the table however for now I'd keep the oil changed and have fun. The 139661 cam is going to make most hp near 6,400-6,600. What do you have it propped for at WOT? The dyno sheet contradicts this especially showing peak torque at 4,650. I've personally not seen a dyno sheet like this with the rpm's not being sequential. SB what happened in the scribbled out area? I can see where the split is but why would this not be making more hp at 5,700? Is cam installed 8 deg adv? Lol. To OP I am just trying to figure this out and have it make sense with me. Cam vs hp. I am jealous of your find. Haven't heard one of these in a while. Similar to 68 Shelby found in old lady's barn out in the country on a gravel road. Ha. Congrats. I am happy for you.
(middle '90's) His company built Hi Po engines for race teams of the 80's & 90's He told me @ 3800 rpm the Mistress would run 60+ and it's attitude as if on rails....... (his words) It's also a Kevlar hull. |
My 572's with 252/260 @ .050 cams and 355CNC heads maxed out at 5750rpm 735hp TQ was 714 at 4500 wasn't trying to rotate the earth, DEPENDABLE!
|
What's it weigh?
Originally Posted by scippy
(Post 4467301)
Getrdunn............I'm pretty confident that the owner of Flagship Marine in Punta Gorda, FL. Built these engines to be dependable (very mild) he used the best technology at the time
(middle '90's) His company built Hi Po engines for race teams of the 80's & 90's He told me @ 3800 rpm the Mistress would run 60+ and it's attitude as if on rails....... (his words) It's also a Kevlar hull. |
Originally Posted by scippy
(Post 4467301)
Getrdunn............I'm pretty confident that the owner of Flagship Marine in Punta Gorda, FL. Built these engines to be dependable (very mild) he used the best technology at the time
(middle '90's) His company built Hi Po engines for race teams of the 80's & 90's He told me @ 3800 rpm the Mistress would run 60+ and it's attitude as if on rails....... (his words) It's also a Kevlar hull. I would have to agree. I wouldn't touch a thing until rebuild time. Impressive HP at low rpm. Gotta like that. |
Originally Posted by Full Force
(Post 4467471)
What's it weigh?
I'm curious if the difference would be negligible or not between Kevlar and regular layup..........There was a picture posted of a Kevlar Mistress and it's stern seemed lighter in the water. |
| All times are GMT -5. The time now is 06:06 AM. |
Copyright © 2026 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.