BJ 29 v3 running hot help

[boatsrnew2me]

my bj29 v3 runs kinda hot . stock setup here with a cnc x440/3 blade prop .timing 7.5
first run was with 5500 mah lipos mid tray , top speed 49.1 . motor temp 170 esc 130ish.
second run 5000 mah all the way back in trays (lighter lipos too) motor temp 150 esc 100-110ish .top speed 51.4

strut is level with sponsons with boat sitting on table .

should i raise the strut? can you tell by my running video if its running too wet?

[Erroneous]

Raise strut to 1/8" above the table ( I run mine at a slight negative angle ). One prop blade should be in the water when at speed.

[ray schrauwen]

4S or 6S?

[boatsrnew2me]

running 6s

[Fluid]

Gotta be 6S with that prop and stock motor to get those speeds. What ESC? The motor is likely now damaged with those temps if done often...



.

[ray schrauwen]

I was going to say motor life going south quick too at that temp.

......

[boatsrnew2me]

everything stock cept the prop . i dont run it like this all the time ,at this temp . i should be able to get the temp down . second run was only a 2 minute run ,i was being more cautious because of the first run temps

[Erroneous]

I never did like the stock setup. Was it fast, yes. Did everything run hot (even the ec5 connectors), YES. Changed out all the guts pretty quick to Seaking180/leopard 4074. Ran faster, smoother and alot cooler (even the ec5 connectors). Try a 2 blade prop in the 43mm range with the strut raised and the packs to the back. Motor still smoking, I would have no trust in it. Like Fluid said the motor could be scorched.

[boatsrnew2me]

i raised the strut 2mm hope to get a run in thursday if the weather is better . yes i have read things run hot with this boat .but its still new ,i have no desire to change anything yet .i will update my findings

[boatsrnew2me]

raised my strut about 2mm ,went for a run . lost about 2 mph and temps werent any better ,after 4-5 passes and maybe 2 minutes max motor was again 170 coming in . esc wasnt too bad 130 max.
anyway ,i am going to put the strut back where i started and start looking for other ways to get the temps down .

what if i go the other way with the strut?
check my pics ,the first line is where i started and you can see its raised up about 2mm. i scribed the strut with a razor knife so i can see where i started and where i been .

anyone ever use a transom pickup for water cooling on these boats? for now i will start drilling the water openings open in the rudder, the top of rudder nipple ,ect,ect....

20170420_144350.jpg20170420_144401.jpg20170420_144418.jpg

[fweasel]

I've said it a number of times before, your cooling lines are plumbed wrong.

[boatsrnew2me]

I've said it a number of times before, your cooling lines are plumbed wrong.

line goes to motor first ,thats where i need the most cooling . if i were to turn the cooler to get water to enter at bottom the top nipple would be straight up and not allow me to close the hatch .

what are you suggesting?
what were your temps when you ran the x440/3?

[ray schrauwen]

Do you always run the drive dog that close to the strut? You need at least 4mm gap there. That can heat things up.

[boatsrnew2me]

Do you always run the drive dog that close to the strut? You need at least 4mm gap there. That can heat things up.

no i usually dont ,looks like i did today eh?

i will open up the gap .someone else noticed my rudder was not 90 degrees and i have corrected that now as well . are these washers between the drive dog and strut even needed ? i could take those out and have a nice gap there . it came with them out the box .

i worry if i open the gap too much there wont be enough flex shaft in the collet .removing the washers would take care of that .

i also put my strut back where it was during my best run . Rafael noticed something with my prop too which i have corrected now .

[boatsrnew2me]

update ....
i straightened out the rudder ,it was pitched inward a little before .
i removed the plastic washers at the drive dog'
i drilled out the rudder water inlets and the nipple on top the rudder
left bigger gap between strut and drive dog .
i smoothed out the leading edges of the prop ,Rafael noticed it was kind of blunt .(good eye ,thanks)

last run i did was near 50 mph and temps were down to 135 motor and 110 esc .

i have since then also drilled out the water outlet to a larger size . will be taking a test run today .