mad_boater
Well-Known Member
Is it true that engines with super chargers are not supposed to be for cruising in the rev ranges when they are engaged. I have had problems with the belts shredding.Thanks
Supercharger belts
- Thread starter mad_boater
- Start date
nyx2k
Well-Known Member
i thought the idea of a supercharger is that its always running unlike a turbo than runs from a set rev point
CX54WEK
Well-Known Member
What engine are we talking about.
On our KAD32 the superhcarger runs from 1500rpm to 2500rpm. It cuts out above and below these revs, the turbo charger taking over above 2550rpm (ish).
We have never found a problem with our belts shredding even if we have run with the supercharger engaged for extended periods. Is there something catching on your belt?
We changed our belts a couple of weekends ago after 500 hours use and they looked in as good a condition as the new ones we took off other that the writing on them was dirty!!
On our KAD32 the superhcarger runs from 1500rpm to 2500rpm. It cuts out above and below these revs, the turbo charger taking over above 2550rpm (ish).
We have never found a problem with our belts shredding even if we have run with the supercharger engaged for extended periods. Is there something catching on your belt?
We changed our belts a couple of weekends ago after 500 hours use and they looked in as good a condition as the new ones we took off other that the writing on them was dirty!!
Imperial One
Well-Known Member
KAD32 belts are very prone to shredding if there is the slightest piece of rust on the bottom pulley.
My advice is to have a close look at all the pulleys to see if you have any rust or snag points on them. Clean them up and hopefully the problem will disappear.
I had this belt shredding thing happen to me once in a big swell off lands end - imagine a very light weight American GRP flybridge boat on one engine, running at displacement speeds in a big swell. Boy, were we glad to get to Falmouth!
My advice is to have a close look at all the pulleys to see if you have any rust or snag points on them. Clean them up and hopefully the problem will disappear.
I had this belt shredding thing happen to me once in a big swell off lands end - imagine a very light weight American GRP flybridge boat on one engine, running at displacement speeds in a big swell. Boy, were we glad to get to Falmouth!
MapisM
Well-Known Member
Are you sure you didn't cruise extensively at a borderline rpm, where the SC were constantly engaging/disengaging?
I'd expect that to be much worse for the belts, than constantly running with the SC engaged.
Then again, such "borderline" rev is normally a transition point, not something you'd want to keep while cruising...
Peanuts
Well-Known Member
I had to read this post several times just to make sure I had the facts correct. I believe you are saying that you had problems with a belt shredding, not necessarily the s/c belt as I think people are reading it, I would imagine you are refering to the circulation belt that gave you the problem.
As already mentioned by Imerial One inspect carefully the lower pulley for any corrosion or damage and then the other pulley above it. This belt has the most work to do out of all the other belts. Also always check the correct torque setting when you replace it.
The s/c belt rarely gives any problem, it does not go onto the lower pulley but always check the pulley grooves and torque setting when tensioning.
Hope this is of some help.
Also it might help if you gave a few more details such as what boat etc.
Are you saying your s/c is normally working when you are at your cruising rpm? I would have thought 1700-2600 would be a bit low for a cruising rpm in a KAD32.
As already mentioned by Imerial One inspect carefully the lower pulley for any corrosion or damage and then the other pulley above it. This belt has the most work to do out of all the other belts. Also always check the correct torque setting when you replace it.
The s/c belt rarely gives any problem, it does not go onto the lower pulley but always check the pulley grooves and torque setting when tensioning.
Hope this is of some help.
Also it might help if you gave a few more details such as what boat etc.
Are you saying your s/c is normally working when you are at your cruising rpm? I would have thought 1700-2600 would be a bit low for a cruising rpm in a KAD32.
aquatom
Well-Known Member
It's a shame they couldn't have fitted a toothed belt. They would last for hundreds of hours, never slip or squeek and would not need to be as tight relieving the stress on the water pump bearings.
Greg2
Well-Known Member
Surely the belt is running all the time, whether the supercharger is in operation or not, so not likely to be linked to to how long it runs for.
[2068]
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Yes, but if the clutch isn't engaged, it isn't under (much) load.
On KAD series engines, it's the smaller (auxiliary) belt that is critical, cos it drives the supercharger belt and the circulation pump.
On KAD series engines, it's the smaller (auxiliary) belt that is critical, cos it drives the supercharger belt and the circulation pump.