The new motor. Update 12th March 04'

[Cubes]

lol.. funny you should say that as when I was 16.5yrs old i was driving around mum and dads L300 4WD Mitsi express van. It was a yellow lunch box looking one.

After 2wd burnouts we planned to tie to a tree and drop burn outs but never got around to it as a balance shaft ceased up when the oldies were driving it Lucky me.

[Cubes]

bump..

[Nightcrawler]

My 2c

bad news Joel/Matt - as you would probably know I blew my clutch last week before/at the drags .... I thought I had an Exedy/Extreme Single Plate Organic clutch, but when they pulled it out it turns out it was a 6 puck cushion button (sounds similar to what you are getting/have got) .... and I blew it in under 20,000km with most of those kms only being 160rwkw. Yes I do drive the car for work so it gets a lot of shit all day with thousands of stops and go's (and 2 trips out to the drags - around 20 runs all up but no slipping until last week), but nevertheless it still went within 20,000km. I now am the proud owner of an Exedy Twin Plate clutch from Morpowa and it's bitey, but excellent - I can even get 4th gear chirps now .... just a word of warning to the wise anyhow.

I can't wait to see all these new beasts prowling the street!

[Cubes]

What was it that blew on the clutch? The pressure plate?

Mine has 9 puks on one side then 9 on the other side.

So I guess that would be a 9 puk clutch?

What did the twin set you back? $2400?

Thanx Nightcrawler.

I did look at the twin but couldn't afford it as the motor has nudged over $4000 with all the other little parts etc I've had to buy. Especially still being at Uni.. Lol..

[Maxx]

My 2c

bad news Joel/Matt - as you would probably know I blew my clutch last week before/at the drags .... I thought I had an Exedy/Extreme Single Plate Organic clutch, but when they pulled it out it turns out it was a 6 puck cushion button (sounds similar to what you are getting/have got) .... and I blew it in under 20,000km with most of those kms only being 160rwkw. Yes I do drive the car for work so it gets a lot of shit all day with thousands of stops and go's (and 2 trips out to the drags - around 20 runs all up but no slipping until last week), but nevertheless it still went within 20,000km. I now am the proud owner of an Exedy Twin Plate clutch from Morpowa and it's bitey, but excellent - I can even get 4th gear chirps now .... just a word of warning to the wise anyhow.

I can't wait to see all these new beasts prowling the street!

nice to hear about yr new clutch, but the S15 6 speed gearbox are not that strong, be careful :Bang:

[Cubes]

Are u bac in Adelaide Maxx?

[Nightcrawler]

Joel the twin was $2,750 fitted ....

Chapman - yeah I know I might break a gearbox sooner or later - will just have to see how she goes.

[meggala]

HMmmmmm sounding very good joel glad to see your coming very close to the final product.

my cefiro goes in on monday to have the sr 20 fitted with the t518z 10 cm I will be very curious to see how it performs in comarison to you rb 25/30 mine wont make full boost til 4k rpm I prefer it that way for day to day driving.

my aim is some where down in the 12's with the setup time will tell.

are you going to run a rb 25 box joel or jsut the 20 one ?

I;m also consdering the clutch issue i ahve been offered a twin plate and I'm wodering wheter to take it I would prefer a more gentil take up.

meggala

here is the dyno graph of the turbo not 300 rwkw of course but on a built motor I belive 280 is doable @ high boost.

http://www.meggala.com/t518ztrustdyno.jpg

[whatsisname]

Thanks for the info Andy. I'm pretty kind on clutches so I 'may' get away with a few more k's than you did mate. 20k for me is 2-3yrs driving too Do you know what the pressure plate was rated at on your old 6 puck? My 9 puck is clamped by an 1100kg p/plate.

[Nightcrawler]

I think it was only about 690kg from memory Matt - I wanted very light and streetable, and it was the same as the oem clutch. I guess it kinda makes it clamp softer, so it let go easier - but in the end they all go sooner or later.

Fyi I am getting quite used to the twin plate already - only stalled it twice on the cruise today, but sometimes my foot just happens to slip off too quick and you well know the result of that!

[Cubes]

Meggala

I'm going to use the RB20t box until it goes. I'm interested to see how it holds the power with a set of 225's on the rear. From what I've seen from others the rb20t box's only seem to go when slapping a set of sticky tyres behind them and making over 200rwkw. Unless of the box was on its way out anyhow which mine is. (loud input shaft bearing noise + whining through the gears)

Might even give the RB20t box a rebuild my self and see how it holds up. Providing I don't strip gears & only do a bearing.

[whatsisname]

690kg certainly is light... but yeah like you said Andy, they all die eventually.

Don't you hate it when your foot slips off too quickly

[Chris32]

Joel - clutch will be fine

Both myself and Freebaggin have had the same clutch for over 12 months with no probs. I have the cushioned ceramic multi button clutch with the heavy pressure plate (1090kg from memory)

Mine has done 30,000+km at 200rwkw, seen off 4 sets of tyres (one set was a set of RE55S semislicks), 15 1/4 mile passes, a Mallala track day, 30+ dyno runs and driven to and from work - 45km per day in traffic, and its still feels really good. RB20 gearbox is starting to get a little crunchy now though!

Freebaggins has endured similar punishment, but he has had his a little longet than me

I guess its like anything though, people have good runs and bad runs with certain products, just down to the individual and there driving style

Mine as well as Freebaggins is being used in conjunction with a lightweight cromoly flywheel, not sure if this helps or not, but if anything the cromoly would be harder on the clutch material than the original cast iron flywheel

Chris

[Cubes]

Well the motor is assembled.

Pick it up towards the end of next week as I've got uni this week.

[EnricoPalazzo]

Yay!!!

[ADM]

Guys, did you do any research into the oil feedback issues from the head. I know the RB26 suffers from this and most rebuilds address it. Is it an issue with the 25 head??

ADM

[Cubes]

Not sure. Andrew checked out the head with regards to oil feed (block feed restrictor) and oil return from the head, and he seems to think the head I have won't have a problem.

Could it be that the hi-po RB26's spin over at a much higher RPM causing the problem?!?! Higher crank rpm should equal higher oil flow?!?! or doesn't it work like that?

So what exactly is this problem you are talking about?

The motor dumps all the oil in the head causing oil surge and bugger all oil in the sump?

[Cubes]

I've done a search.

http://www.skylinesaustralia.com/forums/sh...+oil+restrictor

Merli,

A standard RB26 pumps too much oil up around the camshafts at high rpm, which doesn't leave enough oil down in the sump and can lead to oil starvation during high cornering loads at high rpm, even with sump baffle plates. (i.e. track situations) An oil gallery restrictor restricts how much oil is pumped around the head and leaves more in the sump.

The RB30 had 2 oil gallery restrictors that were 1.4mm dia internal. The RB20DET of Darrens was approx 2.5mm dia internal. Due to our heads being Non-VCT we had the restrictors drilled out to 2.5mm. From memory the VCT head's block has oil restrictors of 2.8mm dia internal. I can't remember if both restrictors were 1.4mm dia on the RB30 block or if andrew drilled out both to 2.5mm. I'll have to ask.

I'm using a RB25DET pump Darren is using a RB20DET pump.

Also

B-Man,

Has anyone tried restrictors on an HiPo RB25DET ?? I understand that not neccessary due to the differences in soild vs hydrolic lifters ??? Not sure on this though.

I find that interesting..

[ADM]

I believe the problem occurs during constant high revs, where the quantity of oil pumped to the head can’t escape back to the sump quickly enough to keep the sump at a level sufficient for high cornering loads. I believe the GTR has one oil feed blocked all together and the second feed is restricted (not sure what the restricted size is). I hear that drilling the oil return out to a larger diameter and/or creating an extra return to the sump can help solve this as well. I wish we had a definitive answer for this.

Also, can I PM one of you guys about City Dismantlers. I am considering rebuilding my GTR engine there and would like to ask some question and compare notes.

Cheers

ADM

[Cubes]

mawahahaha

Picked the motor up today.

Was packaged nicely on a pallet in bubble wrap.

Still have a few bits to finish off.

Clean up the manifold ports a little more bolt everything on, get my self a damn bolt for the cam gears that must have been sucked up by the hoover.

Mod the cam belt covers etc.

Here's some pics.