R33 Gtst Clutch Fan

[PETSR33]

hi guys maybe you could shed some light for me, i recently had to change my clutch fan on my r33 s1, i never had a problem with the fan hitting my custom cooler piping, but as soon as i changed the fan i cant rev over 5000 otherwise it hits! were there different fans for the skyline - or do you think there was a different fan used from the beggining? im stumped.

[jake33]

just a thought..

when you got your custom cooler installed did they/you have to cut your fan down a little?? had to be done to mine, and

most people cut it.

compare the new one to the old one, and if the new ones bigger, then just give it a lil trim.

Edited June 21, 2007 by jake33

[mad082]

also, did you take the cooler piping off to change the fan? if you did then you have put it back in a slightly different position and they is why it hits. just trim the tips off the fan.

[PETSR33]

i think i threw out the old fan, ill try trimming it down, will it affect anything if its trimmed down? and whats should i use?

[jake33]

wont effect heatwise and air too much, i mean obviously your cutting the fan down so yeah its not gonna inmprove, but it wont affect much at all. no change in factory gauge temp for me.

took some pics to give you an idea of what a workshop did for me. i just got a cooler kit. not really custom piping. just draw mark up some even cutting lines for each fan blade and use any type of tool that would cut through the plastic, i.e hacksaw

hope it helps

Edited June 22, 2007 by jake33

[sh@un]

does the fan still free-spin?

if the viscous coupling is locking up, you'll need to change it.

[mad082]

wont effect heatwise and air too much, i mean obviously your cutting the fan down so yeah its not gonna inmprove, but it wont affect much at all. no change in factory gauge temp for me.

took some pics to give you an idea of what a workshop did for me. i just got a cooler kit. not really custom piping. just draw mark up some even cutting lines for each fan blade and use any type of tool that would cut through the plastic, i.e hacksaw

hope it helps

+1. i just made a template up and marked each blade the same then just nipped them off with a saw. as the picture shows, you only have to take off the back corner.

[msnismo]

Doesn't shaving the fan blades end up affecting your water pump? Unless you get it done professionally and its rebalanced.

My dad reckoned that it wears the water pump out quicker as the bearing isn't balanced and cavitates or something - could of been a scare tactic to stop me putting the FMIC in though... although he had the last laugh when I indeed replaced the water pump 30,000km later..... I still claim its a coincidence but saw an excuse to promptly mod further and put a forward facing plenum and a new clutch fan on !

Knowing dad though he was prolly right! But if he is wrong puhlease tell me!

[sh@un]

Doesn't shaving the fan blades end up affecting your water pump? Unless you get it done professionally and its rebalanced.

My dad reckoned that it wears the water pump out quicker as the bearing isn't balanced and cavitates or something - could of been a scare tactic to stop me

it'd definately wear the bearing out quicker, but cavitation is caused by spinning the pump impeller too fast.

[msnismo]

it'd definately wear the bearing out quicker, but cavitation is caused by spinning the pump impeller too fast.

.

Damn ok.... yeah I wasn't sure if he said cavitate or something else... meh... he is always right, I hate having a mechanic for a dad sometimes!

[mad082]

you could always just loosen off the clamps of the piping and sit there for ages moving it round till it doesn't hit the fan.

[PETSR33]

the fan doesnt spin freely at all. (ie not freely like a bmx bike wheel), is there any other type of clutch fan i could use like a gtr fan or 200sx, 180 etc etc?

[RANDY]

By "freely", it probably won't spin when you let go, but it shouldn't take much effort to rotate it.

It'll be making a very loud wind/whooshing noise if it's completely locked up. (like the first 5 minutes after turning your car on in the morning)

[PETSR33]

yeah when the original fan died - my skyline sounded like an XD falcon....i think im going to chop the baldes a little - also is it right that the blades sort of expand when the blade spins - i must sound like a real loser but im just confused by the whole thing.

[RANDY]

Highly unlikely dude.

More likely if it only hits under load, that your engine mount on the torque side is stuffed, and the motor lifts up and hits the piping. The piping probably doesn't move from the turbo because of some silicone joiner taking the flex.

That's a loooong shot, but I don't see why it's not possible?

[PETSR33]

ok - im going to take it to a turbo workshop and see what they say, because like i said after 5000 revs the fan hits, ive changed the fan 3 times and hopefully they can sort it out, thanks for all your input.