Another X question
#21
if you have the drive and everything out gimbal and all sell it you could buy a complete used bravo 1set up cheap gimbal set up 1200 or 200 new, drives from 1000 to 2500 or new b1x for 3400 theres a guy selling them once in a while, I bought one. the bravo gear case is much better than kc plus you want a low water pick up drive. so you should get 1500 to 2500 for yours and be close to the merc stuff used. 5'' height will be fine. put I wouldn't waste your time with the omc its to fat and weak. I have done both a shortie pick up 8gps and now a konrad ace drive set up set at 3''. cost me 2 grand to have exhaust holes and gimbal cut out filled. art
#22
Registered User
Joined: Dec 2009
Posts: 148
Likes: 0
I have a formula 311 sr. I raised 3 inches. with my favorite props, hydromotive q4 the boat would not plane.however any bravo offering on, the boat would plane. Just for sh%ts and giggles, what I am about to tell you next should have been on the jackass movie. I had another boat help pull me to plane out with the hydromtives. the result here was 4 mph top speed gain.3 mph cruise speed down to 3200rpm, after that ,it was slower with a bunch of slip. I put in 1 inch spacers and diffuser rings on my hydromotives and have to work the tabs and wheel to get the boat to plane, wit the spacers I lost 1 mph as opposed to not having them. The boat handeling was the same, the boat seemed to have a bit more slow speed porpise, cured with some down trim.I was in about 600.00 in materials for this project, in pluggung the holes and rerigging the boat.If you are hyd. steering you also will need to move your rams up also, and possbly indicator cable outlets. I would purshase the mercury transom jig for recutting the holes for the drives. This will greatly aid in the accuracy of the engine alignment when insytalling the drives. Another thing to think about is the front engine mounts will need to raise and move back proportionaly to the transom angle. Next I notched the transom of the boat, opened up a can of worms I still am trying to sort out, both good and bad results.Can explain another time. Last boat not least on X raising, do you have the room under the hatch, I had to remake my hatch to clear the goods underneath. If you take on this project and have questions my # is 702 604 5401 Aaron
#23
Yes, I do have the King Cobra drive & converting everything then buying a shorty is out of the budget. Its very surprising with the various results. Some guys put a 2” shorty on with no improvement & others report +10mph. I talked to a guy earlier who said he saw a boat pick up 7mph by only going up 1”. Another picked up 12 by going up 4”. Jeff saw 3-4 by going up 3”. Seems like a crap shoot on what the results may bring. Guess I’ll expect the least & hope for the best.
Anyway I already have the drive, motor & transom assembly out. Met a recommended local @ lunch & he quoted 800.00 to patch & move up the cut out. Still want to get a second bid from another recommended local later this week.
Haven’t ruled out doing this myself yet to save some cash if there is a decent savings. Any guess on an approximate materials cost … 200.00-300.00?
One last thought. Does drive heat go up with less drive in the water?
Will I need to think about a drive shower?
Anyway I already have the drive, motor & transom assembly out. Met a recommended local @ lunch & he quoted 800.00 to patch & move up the cut out. Still want to get a second bid from another recommended local later this week.
Haven’t ruled out doing this myself yet to save some cash if there is a decent savings. Any guess on an approximate materials cost … 200.00-300.00?
One last thought. Does drive heat go up with less drive in the water?
Will I need to think about a drive shower?
#24
Frank, nice chat'n w/ya today. How is yours getting on plane with the x up 2"? Per our conversation I'm thinking the shorty might be the direction I need to go (either that or trailer my boat to NJ to your place and let you do the work LOL).
I definately don't want one of those boats that won't get on plane if it is full of fuel and I have a head wind.
I definately don't want one of those boats that won't get on plane if it is full of fuel and I have a head wind.
My old propshaft depth was 7 1/2 inches and now it's 5 1/2".If you want to know that you can go up 2" give me a call and I'll have to get some measurements from you on the back of the boat. The early model 36's were built for Mirage Plus props and had a lower X Dimension, the later 36's were built for Bravo I props and had a higher X Dimension.
Frank
[youtube]http://www.youtube.com/watch?v=ExbZfhvYlsA[/youtube]
#25
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Joined: Oct 2005
Posts: 1,899
Likes: 20
From: Millstadt, IL
Doing the work myself, raising my X 2" on both engines cost me something like $1500.... The man-hours were a LOT though...paying someone would have cost a ton more...
It was either pay $7K for shorties or $1500 in supplies and do it myself... I chose the latter and gained 4-5 mph on the top end and 3-4 mph in mid-range.
http://s706.photobucket.com/albums/ww64/Fungarten1/


It was either pay $7K for shorties or $1500 in supplies and do it myself... I chose the latter and gained 4-5 mph on the top end and 3-4 mph in mid-range.
http://s706.photobucket.com/albums/ww64/Fungarten1/


#26
#27
I got 8mph raising the engines.drives 2". It cost about 3k to have the transom replaced and we cut the holes. It does take longer to get on plane but a boat tuned for speed will have that problem. I'd do the project again in a heartbeat. The boat is much more fun now.
#28
Thread Starter
Registered
Joined: Jul 2006
Posts: 524
Likes: 2
From: Colorado
Jeff, frank, I’ve been reading your posts & they have been very helpful. I met the other guy today & he was fairly close to the other bid. The misc. expenses that add up have me leaning towards subbing this out. Both guys are booked out till later in December so this project will be stalled for awhile.
Amazing what some guys have collecting dust in the garage? This guy had a B-class 25’ cat, surface drive, w/ a blown up blown 588” that’s been sitting there for 5yrs!
Amazing what some guys have collecting dust in the garage? This guy had a B-class 25’ cat, surface drive, w/ a blown up blown 588” that’s been sitting there for 5yrs!
#30
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Joined: Oct 2005
Posts: 1,899
Likes: 20
From: Millstadt, IL
Very unusual to gain that much speed. Trust me, I've spent whole days out on the lake with dozens of props and wrenches to raise and lower mine on several boats. Hydrodynamic drag is what you're aiming to reduce with this type of thing and at lower speeds, it just isn't the most significant issue - or the cheapest to cure.
And remember, he has the dreaded King Cobra drive so he's stuck with "the expensive option" to raise his propshaft up.
And remember, he has the dreaded King Cobra drive so he's stuck with "the expensive option" to raise his propshaft up.




