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Old 01-04-14, 00:28   #1
whiteyz
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Vlt oil pump/crank collar help

So this may have been coverd somewhere else but ill be buggerd if i can find anything useful.

Ive just got my block/short motor back from the shop!
I had a crank collar fitted as recomended by my engine builder.

I went to fit my VLT oil pump today only to find that the ******* dosnt fit any more ???

I have a crank sitting in the shed out of another motor (without a collar fitted) ive measured the snouts/oil pump flats and the outside diameter of both carnks with and with out collars fitted and they are basically the same size in all aspects aside from the length of the flats/drives.

It looks to me that the length of the flats & outside diameter the crank collar now foul on the oil pump casing just to the front of the flats/gear in the oil pump its self.

Any one had this drama before?
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Old 18-04-14, 22:41   #2
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U don't run a collar for vlt pump only skyline pumps and aftermarket pumps like nitto or jun Ect don't know y ya machinist fitted a collar if u r running the stock pump
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Old 19-04-14, 07:38   #3
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I've got on fitted to mine with a vlt pump. Sounds as though the collar isn't in the correct position on the crank.
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Old 19-04-14, 12:11   #4
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Quote:
Originally Posted by 86SLVLT View Post
I've got on fitted to mine with a vlt pump. Sounds as though the collar isn't in the correct position on the crank.
There is no benifets for you to run a collar on yours and you won't be able to upgrade to a high volume pump if you actually have what you are saying. The vlt pump has about 5mm of surface connecting to the crank from the pump gear and the high volume pumps have around 15mm roughly. If you have a collar you won't be able to run the standard pump cause the collar sticks out to far to make up the extra 10mm needed for the higher volume pumps gear. This collar is needed as there is more load on the pump and crank due to the higher pressure and flow it delivers. To sum it up you can run high volume pumps on the standard crank but will eventually fail as the crank will round off where the drive is due to the extra force from the high volume pump and will split the oil gear in half and destroy your engine, I know this as it has happened twice now. If you have a collar fitted you cannot run a standard na or turbo pump again as it won't fit. Think that pretty much sums up everything.
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Old 29-05-14, 22:55   #5
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Thanks for the replies i have not been on for a while!

I was under the impresion that you could fit a collar and still use the VLT pump but it turns out thats not the case!

All good, collar is fitted corectly!

I ended up buying a nitto pump job done lol.

Would anyone happen to know the torque setting for 1/2 inch ARP head studs?
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Old 30-05-14, 19:55   #6
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90 pound normally but i ran 120 when i was 37psi
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Old 30-05-14, 22:41   #7
whiteyz
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Thanks grunter

It was hard to find a clear answer any where.

It will be seeing 25~30psi at the least..
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Old 30-05-14, 23:01   #8
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just be careful not to pull the stud out of the thread
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