Thread size and ratio question
#1
Platinum Member
Platinum Member
Thread Starter
Join Date: Oct 2003
Location: Townsville Australia
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
Thread size and ratio question
Anybody know the thread of the Bravo oil vent bung?
Looking to fit an external reservoir or where can I get a right angled barbed fitting to screw into the oil vent.
Also from the gear set "c" 883479 69680BX.
Is this a 1:65 ratio?
Looking to fit an external reservoir or where can I get a right angled barbed fitting to screw into the oil vent.
Also from the gear set "c" 883479 69680BX.
Is this a 1:65 ratio?
#2
VIP Member
VIP Member
Thread size is 3/8x16. That is a 1:65 gear
#5
VIP Member
VIP Member
303 slower to be exact.... you’ll need to go up at least 1 prop size maybe more, if you were in the low side of the top rpm range with the 1.5 1 size will probably be right
Last edited by JaayTeee; 03-06-2020 at 09:09 PM.
#7
Registered
From the best of my knowledge, an oil vent adapter fitting comes with the kit!
#8
VIP Member
VIP Member
no, that’s prop shaft rpm, if you were running 5000 rpm with the 1.5, you would need to run 5500 rpm to produce the same propshaft speed as the 1.5, but if the engine is capable of running the additional rpm it may pull even more rpm due to the additional torque multiplication ( it’s easier for the engine to turn that prop)
#9
Platinum Member
Platinum Member
Thread Starter
Join Date: Oct 2003
Location: Townsville Australia
Posts: 778
Likes: 0
Received 0 Likes
on
0 Posts
I have 2 late model 1:65 ratio top boxes.
I need to find 400 rpm.
Would it be wise to swap the 1:5's I have now,keeping the same props or are you saying that
will give me too much RPM?
I need to find 400 rpm.
Would it be wise to swap the 1:5's I have now,keeping the same props or are you saying that
will give me too much RPM?
#10
VIP Member
VIP Member
If you switch to 1:65’s and keep the same props, you’ll most likely be over the 400
rpms you’re looking for, you’ll probably need to go up 1 prop size
rpms you’re looking for, you’ll probably need to go up 1 prop size