Alternator Cut in Revs

[petermac 5]

By changing the pulley for a smaller one will indeed increase the speed of the alternator, but

it may be too fast at full revs, so it may, worst case senario explode at high rpm.

Just a thought :headscratch:

 

Peter.

[Pete-H 66]

By changing the pulley for a smaller one will indeed increase the speed of the alternator, but

it may be too fast at full revs, so it may, worst case senario explode at high rpm.

Just a thought :headscratch:

 

Peter.

 

Ok thanks I'm going to ask the Auto Electrician I bought the alternator from for a dafinative answer tomorrow.

[sheffieldcortinacentre 635]

That could be your problem,try it with a normal bulb back in.

[bortaf 85]

I have already changed the bulb for an Led.

 

There's your problem, you cant use leds in there without causing issues, i allways change the entire dash to led except the charge light :)

i'm not going to try and waffle it but LEDs dont give enough resistance or sumink to excite the field coils (or sumink) all i know is you need a resistor in there with the LED in parralell for a single wire non self exciting alternator to work, just put the 3W fillament back in, it's easyer in the long run IMHO

[Pete-H 66]

Well I have spoken with the Auto Electrician I had the alternator from this afternoon and he said the bulb has to be a max wattage of 2.2w and if it still doesn't change the cut in speed then fit a smaller pulley, he also said there is no possible way to blow an alternator up boy over reving it by fitting a smaller pulley.

 

So I'm going to see which bulb I have that is the closest wattage and try that first.

 

Thank you all for your help.

[bortaf 85]

You may not blow it up electricly but over rev it and it can let go, seen it happen, had to underdrive 1 for a high revving race engine (grasstrack 2.0 pinto) cos he'd had 3 go on him, twice the front bearing, last time the rear.

As a foot note the bearing i removed had the same part number as a hotpoint washing machine and a vacume cleaner, both were cheaper than ordering one through an auto electrician

[sheffieldcortinacentre 635]

Perhaps you could fit the Hoover motor in place of an alternator & clean up in the race.

 

Clean up geďdit 😂😂

[petermac 5]

You may not blow it up electricly but over rev it and it can let go, seen it happen, had to underdrive 1 for a high revving race engine (grasstrack 2.0 pinto) cos he'd had 3 go on him, twice the front bearing, last time the rear.

As a foot note the bearing i removed had the same part number as a hotpoint washing machine and a vacume cleaner, both were cheaper than ordering one through an auto electrician

:thumbup:this is what i meant,not electrically.

[Pete-H 66]

Well I will try the bulb first then look at a smaller pulley if I have to, the smallest I can find for the alternator I have is only 7mm smaller than the one I have we will see.

[bortaf 85]

Perhaps you could fit the Hoover motor in place of an alternator & clean up in the race.

 

Clean up geďdit 😂😂

 

I'd ban you for a joke that bad

[wolfrace 116]

Lol.

Mk2's already come with a hoover attached from new. It's one reason why they suck so much. Lol.

[sheffieldcortinacentre 635]

Meow saucer of milk for Mr wolfrace🐱

[Pete-H 66]

Ok I have re fitted a Bulb after fining a 2w bulb and the charge light goes out almost immediately as the engine fires into life so thank you all for you help and advice. :thumbup: :winner:

[Mark.C 0]

That is how my charge light is on my MK5. Rev it up to 1700rpm before it goes out, every time I start it.

It's putting out 14.13 volts.

The bearings are a bit noisy though.

It will be a good alternator when I fit the new bearings. I got them today. 😎

Edited May 2, 2017 by Mark.C

[Mark.C 0]

http://www.smartgaug...uk/alt_mod.html

 

 

Never tried this yet.

😁😀