It didn't do to bad 350 pony's @ 5100 RPM and 370 torque @ 4500 RPM.
I'll post up the sheet so everyone can check it out. I just put it in yesterday, but need a couple of things for the custom captains call before its ready.
Those are big block numbers, with 100 less inches. Nice job! Hope to see it run soon. I put my engine in last night, still have a few "glitches" in my "engineering", but it should all work out hopefully in time for a test run this weekend. I still have no idea what prop I`m going to need so I`m going to have to borrow a few and see what works. Good luck with yours, seeya on the river!
Ya I had it in on the 30th, there where no docks in so i had to leave the truck sit on the ramp. I was pleased though I didn't get on it much because this is the last motor I'm putting in for a long time. This is engine # 5 in 3 years. Once it's all broke in I should see between 65-70mph solo. I'm not sure what prop I need yet, I have a 3 blade 19 pitch SS right now might have to move up to a 23. I had some cavitation on acceleration so time will tell.
I would like to try a 21p 4 blade, from what I understand a 4 blade helps lift the stern and that's what i need.
I was running around 70 with my 330 horse 454 with a 23 pitch 3 blade. I wouldnt run a 4 blade unless you want to pull skiers, there is too much drag pulling that extra blade around on a 20' boat. I tried a 24 pitch 4 blade and lost 3 mph, but it did plane faster and both had my rpms at 4600. The 4 blade was an inch smaller diameter. I take it you are running an alpha drive? The best thing is to borrow props from everyone until you find what your setup likes. I`ve also heard that too much stern lift on smaller boats makes them handle "loose". Unless your boat is really heavy a mirage prop and a lot of trim would be the first thing I would try. It worked for me on my 20' Checkmate. If you have an alpha drive I`m pretty sure none of our stuff will fit, we all run big diameter stuff.
alpha and standard bravo1 use the same props. i have a marage 27p if you want to try it. it worked on my 20ft with a 330hp 454. you will need to spin a lot of rmps to get a 23 to go 70mph gps.
Ya I do have an alpha drive, gen 1. I'm already over the hp limit for the drive so I don't know if I should just stay with a smaller prop (less stress on drive) and watch my rpms, rather than prop down the rpms. The boat is far from "loose" now considering it is a 1979 and light and fast wasn't in the original design I'm sure. I'm really not worried about getting every mph out of the boat it can, cause I rarely hold wide open unless I'm racing or heading for the lock after an event downtown
The Last engine I had in the boat ran about 5,300 rpms with a my 19 pitch, but looking for advice here because max hp on this engine is 5,100 and max torque is 4,600. I'm not sure where I should be propping for?
rmfriday
alpha and standard bravo1 use the same props. i have a marage 27p if you want to try it. it worked on my 20ft with a 330hp 454. you will need to spin a lot of rmps to get a 23 to go 70mph gps.
rmfriday, Thanks for the offer, I'll have to take you up on that when the sun comes out for more than a minute Where you from anyways?
that 23 pitch thing has me scratching my head too. The 70 mph was more like at 4800, but still dont work out right... with a 1.50 ratio. I have been wondering if it was bumped up a couple inches because the slip is really low. If you would like to try it you are more than welcome to, I guess it will clear as rmfriday says, and it is a standard shaft prop same as an alpha. I might be interested in trying that 27 myself! The first one I was going to run is a 30 4 blade mirage, but even tho the prop calculator says it will work I`m not sure if these big heads will have enough bottom end to pull it on plane. The cam guy says it will with the big stroke but I guess we have to try and see. As for the alpha living, easy on the holeshots and yank the stick back if you get air and I think it will be fine. Use good oil and change it every month or so too. I have some alpha parts if you tear one up too. I think the lower needs a bearing but the upper "seems" ok. When things get somewhat back to normal I`ll check it out and let you know. A cheap spare is a good thing!
i dock up in mon city, on the mon of corse. i take a few trips downtown on the boat ever summer. the 27p may be to much prop but it is worth a shot. as far as the alpha living goes, i was not very nice to mine and it held up really well. if it does blow a s.e.i. alpha replacement is like $1200 with a 3 year no questions asked warrenty.
moisturemissile, i dont think they make,made a 4 plade mirage. i think your thinking of a 4 bade bravo 1 prop. i dont know what your running but that is a lot of prop!
Your right again RM, I must have been having a "senior moment". I just borrowed a 26" 4 blade Spinelli from my buddy Phil. I have a 598" Dart headed Merlin II Chevy in a 20' Checkmate with a Bravo XZ and a 2" Imco shorty . I`ll let ya know if it works. If there are no bugs or snags I should be in the water Thursday for a test run. Hope to see you guys around this summer!
I tried the 26" prop and was on the rev chip (4900) at less than 1/2 throttle. Switched to a 30" bravo 4 blade and still gets right up on plane at 1/4 throttle and touches the rev chip right before it gets weird. I have a lttle more prop testing and maybe some bottom blueprinting but I`ll get it. Sorry, noone with a gps would ride with me so all we can do right now is guess. I`m guessin` 85ish. goona try a 5 blade hydromotive next. 30 or 31 pitch. whatever I can get my paws on.....
I just blew the bellows out of mine, I'll have it fixed for this weekend.
I didn't gps mine ethier but I smoked a friend of mine 06 Crownline 23' that felt good! I was turning like 5,400 to 5,600 rpm with 6 people on board upstream with the river at 12.4ft I would like to try a 23 4 blade or even a 3.
I`ll have to check with the rest of our group and see about skyblast. I would bet we are going. I have a 23" 3 blade you can try, it worked really good on mine with the old power. I pm`ed you my cell #, call me if you want to try it. I had 5 people on mine at one point and it dont seem to like that over about 60 unless I put the tabs down some. What ruined my weekend is after working on figuring this new power out my buddy let me drive his 32' Fountain. mine kinda sucks now!
Going To The Dyno Tomorrow :)
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