310 cc heads
11-19-2015, 03:42 PM
#321
Zone you are wasting your time going back and forth with any of these guy's. straub and foxwell got kick off the site when this site meant something, the owners knew what was going on and the mods did their jobs. Those days are long gone and its threads like these that bring in the traffic that pay the bills. I am tired of fighting with these idiots, how about you start a thread over on BF about the chosen few that get to carry on over here and invite them there with mods to control the BS.
11-19-2015, 05:25 PM
#322
Registered
Thread Starter
Ok Tim i will lol. Heads are bought, Dart 310 Pro One heads, so.............tell me what rotating assembly i should run. What compression should i run and what rpm should i shoot for to end up with 700hp and lots of torque throughout the rpms. Also what would be a good cam to run? The blocks are gen 5s.
Ok...........really, does anyone have any ideas?
11-19-2015, 05:58 PM
#323
Registered
iTrader: (2)
Callie's crank and rods. SRP pistons. 10:1 compression cam in the [email protected] 112 Lsa 6200 rpm should go a tick over 700.
11-19-2015, 07:12 PM
#324
Registered
Okay, somebody school me here, Bob m. used to give similar question information on threads and got railed against as a “designer“ now it's all different, why?
No dog in the fight but very curious as I'm sure many others may be.
Hp1 seems to know his chit, but bm had many happy customers as well and is now a.pariah in somes eyes.
I seriously hope this forum can get back to tech some day,but it's not looking good. At the end of the day we're boaters and want to maximize performance, isn't it easier to help each other than spend so much energy bashing.
No dog in the fight but very curious as I'm sure many others may be.
Hp1 seems to know his chit, but bm had many happy customers as well and is now a.pariah in somes eyes.
I seriously hope this forum can get back to tech some day,but it's not looking good. At the end of the day we're boaters and want to maximize performance, isn't it easier to help each other than spend so much energy bashing.
11-19-2015, 07:13 PM
#325
Registered
iTrader: (3)
I'd look at the Callies Compstar line, as I know you are on a budget dale. More than enough crank for what you're doing. I believe you'll tear up that Gen V production block long before the crank would be an issue.
As far as cam durations go, just for conversation. A couple recent roots blower builds we dynoed.
First one. 540ci, 7.5:1 static compression, Dart 345 Iron eagles, Crane shelf 244/256 114 LSA camshaft 8lbs boost. 10-71 blower. Peak horsepower was at 6400-6500RPM, torque peaked at 4500RPM.
Second one. 522ci (4.00x4.560), 8.25ish static compression, AFR 315 heads. 10-71 blower. Buddy ordered a custom cam from Bob M. Cam was 245/253 114 LSA. We did not see a peak. At 6700RPM, it was still climbing, but just about done. Torque peaked at 4500RPM also.
Another buddy of mine, had some 540ci N/A engines. Dart 320 heads (race series not pro 1s). Static was somewhere in the 9.25 range, flat top piston. He originally had some 250/260ish cams in them, dominator carb...they were not the best around the docks, but ran good. When freshening the engines, he wanted to focus on a more user friendly rpm range, he called bob for cams. new cams were around 240ish 248ish. Its been a while, and dont remember the exact numbers. Engines made 680-690hp at 6000. Now, his boat, didnt gain any top speed with the smaller cams (30ft vee straight bottom coupled to SSM drives running 90ish mph), however, what he did gain, was a better idle, and acceleration thru the rpm range, with less camshaft.
Something to remember, our boats aren't dynos. You want to look at the full picture. Losing 10HP at peak, might not be worth losing 30-40 ft lbs of average torque. I agree with what KVogt said earlier, about things being a compromise. In marine offshore, when it comes to cams and heads, usually erroring to the smaller side of things, is a better bet, than erroring to the large side of things.
Speed wise, a very rough rule of thumb, is it takes around 25HP, to gain 100RPM with your props. The average offshore boat, that might be 1, maybe 2 mph. The difference between a 675hp engine, and a 700HP engine, might not net you the speed gains you might expect. Most of the time, there's more to throwing HP at your boat, to increasing speed.
Dale, bigboat28, I would focus on reliability, after all the BS you've been thru the past year with engines. A mild camshaft setup, may cost you a little power, but it can pay off in the long run. How many hours would you be happy with, before replacing valvetrain components?
As far as cam durations go, just for conversation. A couple recent roots blower builds we dynoed.
First one. 540ci, 7.5:1 static compression, Dart 345 Iron eagles, Crane shelf 244/256 114 LSA camshaft 8lbs boost. 10-71 blower. Peak horsepower was at 6400-6500RPM, torque peaked at 4500RPM.
Second one. 522ci (4.00x4.560), 8.25ish static compression, AFR 315 heads. 10-71 blower. Buddy ordered a custom cam from Bob M. Cam was 245/253 114 LSA. We did not see a peak. At 6700RPM, it was still climbing, but just about done. Torque peaked at 4500RPM also.
Another buddy of mine, had some 540ci N/A engines. Dart 320 heads (race series not pro 1s). Static was somewhere in the 9.25 range, flat top piston. He originally had some 250/260ish cams in them, dominator carb...they were not the best around the docks, but ran good. When freshening the engines, he wanted to focus on a more user friendly rpm range, he called bob for cams. new cams were around 240ish 248ish. Its been a while, and dont remember the exact numbers. Engines made 680-690hp at 6000. Now, his boat, didnt gain any top speed with the smaller cams (30ft vee straight bottom coupled to SSM drives running 90ish mph), however, what he did gain, was a better idle, and acceleration thru the rpm range, with less camshaft.
Something to remember, our boats aren't dynos. You want to look at the full picture. Losing 10HP at peak, might not be worth losing 30-40 ft lbs of average torque. I agree with what KVogt said earlier, about things being a compromise. In marine offshore, when it comes to cams and heads, usually erroring to the smaller side of things, is a better bet, than erroring to the large side of things.
Speed wise, a very rough rule of thumb, is it takes around 25HP, to gain 100RPM with your props. The average offshore boat, that might be 1, maybe 2 mph. The difference between a 675hp engine, and a 700HP engine, might not net you the speed gains you might expect. Most of the time, there's more to throwing HP at your boat, to increasing speed.
Dale, bigboat28, I would focus on reliability, after all the BS you've been thru the past year with engines. A mild camshaft setup, may cost you a little power, but it can pay off in the long run. How many hours would you be happy with, before replacing valvetrain components?
11-19-2015, 07:20 PM
#326
Gold Member
Gold Member
Join Date: Oct 2001
Location: Haslet, TX,USA
Posts: 1,936
Likes: 0
Received 0 Likes
on
0 Posts
You guys have to much time on your hands! Cabin fever already? Someone bring me up to speed on who's the trouble maker here. I don't have time to read 33 pages of BS to moderate it.
