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Ceramic Coated Extractors OR Under-Drives 

 

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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Mon May 10, 2010 8:39 pm 
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Post some be4 and afters man, it'll be good

 

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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Mon May 10, 2010 8:41 pm 
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will do in my build thread, as soon as it happens

cheers bear

 

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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Mon May 10, 2010 10:04 pm 
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Those Cons for the underdrives aren't actually true.
The only time I've seen a charge problem was when the owner didn't fit the overdriven alternator pulley and even then that was one guy...others who didn't(including me) never had any problems.
The waterpump actually turns too fast normally and underdrives actually reduce the chances of cavitation.
And no-one that I know that's fitted them has ever noticed any difference with steering effort.
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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Mon May 10, 2010 10:27 pm 
Getting Side Ways
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XR9UTE wrote:
Those Cons for the underdrives aren't actually true.
The only time I've seen a charge problem was when the owner didn't fit the overdriven alternator pulley and even then that was one guy...others who didn't(including me) never had any problems.
The waterpump actually turns too fast normally and underdrives actually reduce the chances of cavitation.
And no-one that I know that's fitted them has ever noticed any difference with steering effort.

How can a smaller pulley reduce pump speed

 

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Now, I've got a message for all the other drivers out there. If you smell a delicious, crispy smell after the race, it's not your tailpipe. It's just a little of Shake...and Bake!
SHAKE AND BAKE

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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Mon May 10, 2010 11:37 pm 
Getting Side Ways
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The main crank pulley is smaller by a fair bit, A smaller pulley will reduce the belt speed as the circumference is smaller.

Example, you have a pulley that is 10 inches in diameter which has a circumference of 31.4 inches

Your motor is idling at 500 rpm, so so in one minute the belt will move 15700 inches.

If you swicth to a pulley that is say 5 inches it will give you a circumference of 15.7 inches
At 500pm, one minutes worth of idling, the belt will move only 7850 inches.

Now that pretty much slows the belt speed down to 1/2 speed .

 

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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Tue May 11, 2010 12:26 am 
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ford-racer46 wrote:
XR9UTE wrote:
Those Cons for the underdrives aren't actually true.
The only time I've seen a charge problem was when the owner didn't fit the overdriven alternator pulley and even then that was one guy...others who didn't(including me) never had any problems.
The waterpump actually turns too fast normally and underdrives actually reduce the chances of cavitation.
And no-one that I know that's fitted them has ever noticed any difference with steering effort.

How can a smaller pulley reduce pump speed


The same way a small cog does on your bicycle.
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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Tue May 11, 2010 4:13 am 
Getting Side Ways
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VIC, Australia

underdrives, good easy upgrade
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 Post subject: Re: Ceramic Coated Extractors OR Under-Drives
Posted: Tue May 11, 2010 9:55 pm 
Getting Side Ways
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sweet as thanks for the replys ppl's. im gonna go with the ceramic coating for now and then when more money has been saved ill do the underdrives. stuff having to pull the extractors off again to have them coated later.

cheers again ppl

 

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