RB25DET clutch fan thickness reduction what think?

[Tenchuu]

So i know that this will most likely make the clutch mechanism run a bit hotter (ie engage earlier, possibily overheat?), but have any of you tossing in the clutch fan considered this to save on room?

stock placement:


thinner placement (clutch moved to inside the disk):


but why not just notch the radiator more and push it all farther forward? well the answer to that is a PBM HMIC (http://www.gtfactory.jp/cms/e107_plugin ... hp?4008.20) and how damn close they come to hitting the headlights. so i can't just move everything forwards.

Currently i have just under 3.5 in of clearance from where this mounts to my griffin rad, so i figure i will push back the radiator about 1/4 to 1/2 if i can in just to have some play for motor shifting (though the syko mounts don't seem like they have much give in them)

from what i read this should fit (backside clearance) with little to no shaving of fins also i will be switching over to a Freddy IM, HMIC, and this all at once and hopefully it so i should be greatly increasing the airflow to my engine bay with this setup over a lower FMIC, and dual FAL pushers.


so what does everyone say?


*****update 1/5/2012*****
still running great, no shroud on the radiator. I have noticed this winter since switching to a HIMC and doing this that may car not runs too cold, and takes a solid 60-80 min to get the heaters blowing anything more than slightly warm air. (with ambient about 43 or below) which is quite a strange issue for a RB.

[eh?]

How about trying a stock R33 radiator instead of the griffin? The skyline people seem to almost never uprade their radiators.
I used a S14 clutch fan in place of a dual fal and it made a massive improvement even without a shroud. I think the stock r33 rad and the clutch fan will take anything you throw at it.

[240z4u]

Interesting this just popped up...

Is that measurement accurate as far as depth from the fan to the base of the fan clutch? I always ran electric setups, but I moved my radiator forward quite a ways and think this may fit now. I am seriously considering it because of cost, and effectiveness.

I don't see why you couldn't run the fan on the other side of the fan clutch.

[b00stinbmx]

what shroud are you guys going to use? the ka one is way off

[julio]

I haven't needed a shroud. Stock clutch fan + 2" dual core alum. radiator doesn't overheat. Thats with a massive 5" core intercooler blocking all sorts of airflow.

[Tenchuu]

eh? i was under the impression that the R33 radiator was considerably higher than the stock one, and that it would take a bit of work to get it in, but i have heard nothing but good about if from the people who i have heard are running one.

240z4u- yes those are pics i took of a R33 clutch fan sitting on the ground with a tape measure pressed up against the fan and against the ground. they may be give or take 1-2 16, but i wouldn't imagine much more. if it makes that big of a difference i can pull out the calipers sometime next week or so to get an exact mm height, but i figure that is more than most of us need.


as far as a shoud, i am not planning on using one, but i have seen some for sale on zilvia to the tune of $30 that you could then modify to fit.

[l0nestar]

The R33 radiator is roughly an inch or so taller than the KA. I noted that when I was comparing the two from my half-cut, many moons ago.
I couldn't fit the R33 radiator into my S13 without getting 'creative' so I opted for a tig'd 2-pass S13-DE radiator.

[240z4u]

Thanks for the information. When I looked through the forums it appeared as if you weren't the first guy to flip the fan so it was shallower.

[DustinZ]

Ive used r33 radiators several times and they are direct fit in a 240sx. Not taller or anything and they dont require any modification except for top brackets to hold it in place. flip the fan on the opposite side of the clutch and shave the back side of the blades for crank pulley clearance. With R33 shroud it fits and looks factory.

DustinZ

[Yellow4g63]

what shroud are you guys going to use? the ka one is way off

I used the Skyline shroud, just had to cut in a few places to make it fit (the shroud).

[Tenchuu]

oh no, this is not my idea, but i hadn't heard of it on these forums, only ones that are a little sketchier, the RB forum here has some pretty good info and critiques. also i added the pics since i figured someone would want those measurements later, as i did before i said to hell with it and just bought one to it out.

thanks for the confirmation dustin.

[flatrate]

man my car is very very tight compared to some, are you guys cutting out some of the upper core support?

I have AC hooked up and im using Mckinney mounts.. mine is gonna be super tight if i do get it to fit...

[Tenchuu]

I am using syko mounts on a R33 cross member to get my measurements.

[treymeiste]

Ive used r33 radiators several times and they are direct fit in a 240sx. Not taller or anything and they dont require any modification except for top brackets to hold it in place. flip the fan on the opposite side of the clutch and shave the back side of the blades for crank pulley clearance. With R33 shroud it fits and looks factory.

DustinZ

DUSTIN!!! dont give that info out i dont want everyones engine "looking" as stock as mine

[flatrate]

yeah i have 3 1/4 inchs of clearance in my car... motor shifting shouldnt really be an issue, id be more worried about the fan flexing with high rpm

[Tenchuu]

still kind of a mess, but it fit fine with a bit of fin shaving. also the fan clutch was leaking, so i replaced it with one from a 91 pathfinder.

note i didn't notch the core spooprt, but i did bend the lip and slot the radiator mount bottom holes to slide it up flush to the core support. also the piping with the HMIC is a pain in the a** to do.


you can see there that the foam is removed on the tiny lip on the core support and the rad is slid up flush.

[flatrate]

do you happen to know your clearance from the face of the water pump pulley to the radiator core? curious to how close our cars our with all the same stuff

[julio]

+1 on the fan shaving, I had to take off about 3/8" to prevent it from makeing short work of the upper rad hose.

[Tenchuu]

do you happen to know your clearance from the face of the water pump pulley to the radiator core? curious to how close our cars our with all the same stuff

I have a little over 3.5 inches from the front of the pulley to the rad core. I had to shave off around 1/4 an in from the back of the blades to make them clear the crank pulley and power steering belt, they hit the pulley first. Also the face of my fan sits a little over 1/2 in off my radiator. I didn't have any issues with my radiator hose hitting the fans though luckily.

[l0nestar]

still kind of a mess, but it fit fine with a bit of fin shaving. also the fan clutch was leaking, so i replaced it with one from a 91 pathfinder.

Did you use the R33 fan blades, or would an early-mid 90's V6 D21 / Pathfinder blades work? The D21 blades appears to be more 'straight' than the R33 (slight curvature).

[Tenchuu]

I used the blades from a R33, but the clutch fan itself was leaking so i had to replace the clutch component itself. same bolt patterns as the pathfinder, and i hope similar specs. i have a new one coming in in a few days if it doesn't work. Will know for sure this summer.

[flatrate]

Thanks for sharing the info, i might ( if i dont get lazy) install my stock fan and radiator back in the car this weekend, ill be sure to post the results

[nismoplsr]

Looks good. Do you have any more pictures from above or side to show clearances and also some of how you ran the piping on the HMIC with the Greddy IM? That would be much appreciated. thanks.

[Tenchuu]

It is still a nasty mess, i am going to go in and re reoute/clean things up. but that is what happens when you finish up at 10PM on a sunday and have school the next day.



Also i need a bump coupler to help and fix the issues of the IM being so close the the HMIC, but it seems to work fine so far. any which way, you have to want it to do it.

[nismoplsr]

Thanks for the extra pictures. That is tight, for sure. Good to know it is possible though.

[nismosis]

Yes, this is great info guys. And thanks Tenchuu for starting this thread. Ive been wanting to use the stock clutch fan for a while now, but couldnt find any info on the net about it. Hopefully I can fit everything under there with my koyo radiator, if not then I'll just use an R33 radiator. I'm still looking for an R33 clutch fan, as well as an RB25 radiator shroud though, so lets hope I can find those first