Crank Collar

[carl h]

i know jun makes a crank collar to fix the slippy oil pump problem for the short snout cranks but where can i get one?

also iirc there was some one on SDU which sold a 'copy' collar for a reasonable price, and since im almost postive that my rb20 was affected by this drive issue i would like to correct it while it is out of the car.....

thanks.

[Abo Bob]

There is an australian one being made and as I type is being fitted to my crank.

[carl h]

There is an australian one being made and as I type is being fitted to my crank.

<{POST_SNAPBACK}>

while thats nice and all where can one source one, im in the usa not au so any help in the right direction is appreciated.

[Abo Bob]

Pro Engines in Queanbeyan now sell these.

I am told that they are made from 4340 Chrome Moly which is as hard as what the crank is made out of.

$150 supplied or $350 fitted. These are not the sort of thing you can fit yourself at home.

http://www.proengines.com.au/

[Skyrine-Dave]

you sure you cant fit these at home?

How do they work and how are they fitted? Do they just slide on the crank snout to enlarge the surface area for the oil pump drive?

[proengines]

To fit the drive collar you need to machine the area of the oil pump drive and seal area down to 35mm and the collar is pressed on and then grub screwed through the oil pump drive flats. I think some people weld up the front of the crank and machine it back but I havent seen one that's done. I prefer the collar idea. We have them CNC machined from 4340 chrome moly so they wear well, it's a very tough steel. I've attached some photos of what's involved.

[Duncan]

That collar looks great, very professional. Its good to see a local option instead of the overpriced jap options.

I'll take a shot of the dodgy/cheap way when my motor is out.

[Amaru]

Looks great Greg... will probably need one when I blow my engine sky high and need another rebuild (Ask Ed whats im doing with the car).

For anyone that might be concerned about local made "copy"products, Greg does excellent work and has built many a tough GTR's, and always stands by his products. His sump baffles are awesome and a great price too (end of shameless free plug)

[Skyrine-Dave]

thats some very tidy looking work!

is there anyone in QLD who you would reccommend to do this sort of job? and can actuallt do the job!

how difficult is it to do whilst the engine is still in the car?

once again thats an awesome looking setup you have developed!

[proengines]

Thanks guys, I thought it was worthwhile making the collars after seeing the price of the Japanese ones, I fitted one a while back and couldn't believe the price for what they are. We have 3 engines here at the moment that need one which pretty much offset the setup costs to make them. They are being made in batches of 10 so we should always have a few spares around.

Nick, I was talking to Ed about your engine, it should be a good test of what sort of power you can make using the GTR rods. It will be very interesting to see. I should have the 3 litre setup done by the time you eventually break yours!

Dave, you couldn't fit this particular collar while the crank is still in the engine, theres a bit of machining to be done first which needs to be pretty accurate. Most engine shops could fit it once the crank is out, the machining is probably better done in a crank grinder/cylindrical grinder to get it spot on concentric to the centreline of the crank so that both drive flats contact perfectly with the inner gear of the pump I give the collar .002" interference with the snout of the crank which provides the drive, the grub screws are only there as a bit of added insurance. I dont know a lot of engine shops in QLD, I know Bryant Engineering do some very good work, that's not saying that other shops dont though.

I was thinking of making up a spline drive setup similar to what Toyota use on their engines but it would have meant also making a new inner pump gear and as there are so many different pumps available it wouldn't have been worth it. one day in the future maybe.

[Amaru]

Should make up a kit for people doing rebuilds, N1 oil pump with spline drive and sump baffles... get all the oil system sorted in one easy go, and the spline drive will never have any of the problems the RB normal drive has

Yeah the rods will be interesting... talked to a couple of people about it (who are in the know, will fill you in later) and they have all said if I keep a sane rev limit the rods should hold it, its the rod bolts that are the weakest link... (from memory you put the ARP 2000's in mine?). Either way, I know the gearbox isnt going to last a week

Edited December 3, 2005 by Amaru

[T04GTR]

only 200bucks for fitting that. thats very good somhow the basted fil would not cut it i think

great to see how its done i always thought it was pushed up against the small factory on(sortof a add-on thing)

cheeres

oh i dont think a spline drive would work due to how the nose of the crank vibrating.

http://www.atiperformanceproducts.com/prod...mpers/index.htm

Edited December 3, 2005 by T04GTR

[my_gtr32]

Does this problem only effect series 1 R32 gtr not series 2?

I know the issue was sorted by the time the r33 gtr (series 1) was released, 93 also???

i know jun makes a crank collar to fix the slippy oil pump problem for the short snout cranks but where can i get one?

also iirc there was some one on SDU which sold a 'copy' collar for a reasonable price, and since im almost postive that my rb20 was affected by this drive issue i would like to correct it while it is out of the car.....

thanks.

<{POST_SNAPBACK}>

[Abo Bob]

I have seen a crank from a 93 R32 GTR and it had the short drive so while there are some R32's with the longer drive they must have been fairly late in the piece.

[Amaru]

Very late 1994 models had the longer crank drive (as they had basically an R33 engine in them).

[my_gtr32]

R33 gtr's were released 1993. I thought ALL R33 gtr's had the longer crank???

Can anyone confirm...

Very late 1994 models had the longer crank drive (as they had basically an R33 engine in them).

<{POST_SNAPBACK}>

[Beer Baron]

yes all R33 GTRs have it. i'm not sure when they started making and selling 33 GTRs but i do know they were still making 32 GTRs in 1994.

[degeko]

im installing a rb26dett oil pimp off a r33 onto my r32 rb20det, do i need this collar? or can i just put the pump straight on?

[Amaru]

R33 gtr's were released 1993. I thought ALL R33 gtr's had the longer crank???

Can anyone confirm...

<{POST_SNAPBACK}>

R33 GTR wasnt released till 1995 (the GTST was in 1993)... the R32 GTR was still in production through 1994. The last 94 models had the longer crank drive, all R33 and R34's have it as well (GTR's that is).

[Skyrine-Dave]

I had this weekend:

r33 Rb25det oil pump

r33 GTR oil pump

r32 GTR oil pump

all of them look exactly the same. The only difference being the bolt for the pressure relief