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General Car Related Discussion.To discuss anything that is related to cars and automotive technology that doesnt naturally fit into another forum catagory.
This is the current set set up,
Hi all, so I am getting to the end of my supercharger conversion and hoping to have it started in the next month or so. I can't decide whether I need another fixed idler pulley to keep tension on the belt and at idle and when increasing rmp.
If the dual pulley is the water pump, there isn't enough wrap of belt around it.
You need at least 90 degree wrap.
You'd be better coming off the top of the water pump, back of belt under the idler, then up to the S/C pulley.
Hopefully the return from the S/c will pass the idler with belt on.
If the dual pulley is the water pump, there isn't enough wrap of belt around it.
You need at least 90 degree wrap.
You'd be better coming off the top of the water pump, back of belt under the idler, then up to the S/C pulley.
Hopefully the return from the S/c will pass the idler with belt on.
their is the standard belt that goes around the water pump but it's not shown in the picture.
The pulley shown in the photo is actually a tensioner and not a idler. I was thinking I might need a fixed idler to sit on top of the belt as well ?
A good strong spring tensioner idler would be good here. The belts can stretch a lot in use and a strong spring tensioner will ensure no belt slip, and at this sort of location will also ensure good belt wrap.
A good strong spring tensioner idler would be good here. The belts can stretch a lot in use and a strong spring tensioner will ensure no belt slip, and at this sort of location will also ensure good belt wrap.
But again...I would say a good strong spring tensioner, fixed idlers only have limited use and they cannot accommodate belt stretch under load.
Although ultimately it also depends on how much ability the belt drive has vs load against it.
I would imagine it isnt getting pushed terribly hard here.
But again...I would say a good strong spring tensioner, fixed idlers only have limited use and they cannot accommodate belt stretch under load.
Although ultimately it also depends on how much ability the belt drive has vs load against it.
I would imagine it isnt getting pushed terribly hard here.
this belt only runs the supercharger.There is a separate belt for everything else so it should be getting too much stick.
Might try and run it how it is and see what happens
It's just the load from the supercharger really...most other accessories dont take a huge amount.
Some blowers take more than others, more boost will require more power to drive, etc etc.
So lots of variables, but the current setup doesnt look bad and there is fairly decent wrap although an additional idler as mentioned would help all round, although it's a case of fabricating a sturdy bracket for it.
could the belt go anti clockwise arround the water pump have another tensioner or idler in the middle of the heads someone els has said there doesnt look like enough belt arround the pump
could the belt go anti clockwise arround the water pump have another tensioner or idler in the middle of the heads someone els has said there doesnt look like enough belt arround the pump
hmm, never tried to be honest. What's the concern over the water pump?
hmm, never tried to be honest. What's the concern over the water pump?
if theres not enough belt arround the wp it might slip when its driveing hard thats what it looks like to me you dont want to cook it it might be ok i wouldnt take the chance it also looks like theres alot of unsuported run between the wp and sc but without feeling the tension its easy for me to find fault
if there's not enough belt around the w/p it might slip when its driving hard that's what it looks like to me you don't want to cook it it might be o.k i wouldn't take the chance it also looks like there's a lot of unsupported run between the w/p and s/c but without feeling the tension its easy for me to find fault
From post #3 it seems the water pump is being driven by a (missing) belt on the rear , larger part of the pulley from the rear smaller part of the crank pulley.
And presumably around the alternator as well to the left.
if theres not enough belt arround the wp it might slip when its driveing hard thats what it looks like to me you dont want to cook it it might be ok i wouldnt take the chance it also looks like theres alot of unsuported run between the wp and sc but without feeling the tension its easy for me to find fault
hi ,there is another belt that runs the water pump and sits on the inner part of the double pulley,it's just not shown in the picture. The belt shown solely drives the supercharger,so all should be ok.
From post #3 it seems the water pump is being driven by a (missing) belt on the rear , larger part of the pulley from the rear smaller part of the crank pulley.
And presumably around the alternator as well to the left.
beat me too it.
Last edited by ptgladstone; Jan 3, 2017 at 08:01 PM.
Looking at the engine pipework etc....and how close it is to the inner guards, I would either bolt the engine in solid, or ensure they're pretty tight.
It wont do anything any good if they start bashing off the inner guard when the engine moves. And engines do move a lot !
Looking at the engine pipework etc....and how close it is to the inner guards, I would either bolt the engine in solid, or ensure they're pretty tight.
It wont do anything any good if they start bashing off the inner guard when the engine moves. And engines do move a lot !
hopefully it will be OK,I'll find out soon when I start it
Last edited by ptgladstone; Jan 3, 2017 at 09:19 PM.
By the time you've a silicone coupler and clamp on this, it looks like it could be fouling the body. There will also be a lot of leverage here when it impacts from where it is mounted to the engine.
As said, you'd be surprised how much engine etc can move ! And also surprised how smooth they can be when bolted solid.
Last edited by stevieturbo; Jan 3, 2017 at 09:35 PM.
Supercharger idler pully question
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