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Ebay Crank Collar, Anybody Tried Them?

Guishnu

By Guishnu,
in Engines & Forced Induction

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Guishnu Enthusiast

Guishnu

Posted
Posted

Hi All,

http://www.ebay.co.uk/itm/Nissan-Skyline-crank-collar-RB20det-RB25det-RB26dett-/280849305653?pt=Motors_Car_Truck_Parts_Accessories&hash=item4163ec5035

Anybody know of or has tried these crank collars? They are half the price of the spool ones, but anything that's super cheap usually means that it's cheap for a reason. In reality, the manufacturing cost of these are pretty low i'd guess. So they could be just making less money.

I dunno, anybody?

Dobz Experienced

Dobz

Posted
Posted

Doesnt say what its made of nor does it state the clearance. For 25 bucks more get a known one from a local supplier. It may be quality but who will risk it and try one?

It says its made of 4140 high tensile steel, judging by all the positive ebay feedback you'd think it was a well made product.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

I am sure the one in the link will be fine..... or you could buy mine which I know to be fine! They are made to the same dimensions as the Jun collar (43.7mm on the round 40.7mm on the flats) as are most crank collars sold. There is no body of solid evidence as yet that bigger (smaller clearance) is better - or everyone would be making them bigger. I offer free postage as well

JustinP Mentor

JustinP

Posted
Posted

Yes I bought one of these from this guy. The collar is very good and delivery was quick. My machining guy asked where I got it from because it was better than the ones he had been using.

Also when I bought it I did some research on these items. I found an Australian engine parts / engine building company selling the same items for $150. I can't remember which company it was but it seemed reputable.

I also bought a couple of oil restrictors from this same eBay guy, one had a bit of a burr on it which I needed to clean up but other than that they were OK.

Hi All,

http://www.ebay.co.uk/itm/Nissan-Skyline-crank-collar-RB20det-RB25det-RB26dett-/280849305653?pt=Motors_Car_Truck_Parts_Accessories&hash=item4163ec5035

Anybody know of or has tried these crank collars? They are half the price of the spool ones, but anything that's super cheap usually means that it's cheap for a reason. In reality, the manufacturing cost of these are pretty low i'd guess. So they could be just making less money.

I dunno, anybody?

JustinP Mentor

JustinP

Posted
Posted

Actually buy one of these and support a fellow SAU member :P

Good price too.

I am sure the one in the link will be fine..... or you could buy mine which I know to be fine! They are made to the same dimensions as the Jun collar (43.7mm on the round 40.7mm on the flats) as are most crank collars sold. There is no body of solid evidence as yet that bigger (smaller clearance) is better - or everyone would be making them bigger. I offer free postage as well

kitto Mentor

kitto

Posted
Posted

There is no body of solid evidence as yet that bigger (smaller clearance) is better - or everyone would be making them bigger.

I disagree. Running too much clearance between the collar and the pump gear is BAD! Very BAD!

It means your still only driving the gear on one side of the flats, it may infact be more of the gear, but its still only on one side. Too much play also causes the inner gear to chatter away inside the pump housing causing the pump to fail.

The guys in the US and Canada are all over this issue.

The Dan Grand Master

The Dan

Posted
Posted

We've never needed to go anywhere else but Chilton Engineering

Tighe make the collar and Chilton shrink them to the crank with precision. Supplied and fitted for under $250

Don't know why anybody would buy a collar that has grub screws. Seems like a dodgey way to secure it. Like the shift knobs always coming loose

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

We've never needed to go anywhere else but Chilton Engineering

Tighe make the collar and Chilton shrink them to the crank with precision. Supplied and fitted for under $250

Don't know why anybody would buy a collar that has grub screws. Seems like a dodgey way to secure it. Like the shift knobs always coming loose

But i like pulling my knob off ....

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

We've never needed to go anywhere else but Chilton Engineering

Tighe make the collar and Chilton shrink them to the crank with precision. Supplied and fitted for under $250

Don't know why anybody would buy a collar that has grub screws. Seems like a dodgey way to secure it. Like the shift knobs always coming loose

The grub screws are a belt and braces approach. Collar requires the crank to be machined to provide a shrink fit for the collar - grub screws are an extra insurance.
The Dan Grand Master

The Dan

Posted
Posted

The grub screws are a belt and braces approach. Collar requires the crank to be machined to provide a shrink fit for the collar - grub screws are an extra insurance.

Yeah I know how they work, I'm just saying that it's a rather poor idea IMO. If it is correctly machined and shrunk fit then it will never need grub screws. They have just copied the JUN collar I imagine

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Yeah I know how they work, I'm just saying that it's a rather poor idea IMO. If it is correctly machined and shrunk fit then it will never need grub screws. They have just copied the JUN collar I imagine

If you think its a poor idea simply throw away the grub screws. The security of the shrink fit depends on the quality of the machinist not the collar.

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