OK THIS IS HOW YOU TELL IF YOU HAVE A BIG OR SMALL NOSE/BOLT PULLEY
You may notice that your BIG NOSE/BOLT pulley has a plate on the front. That is fine and does not mean you have a small nose.(this is where I screwed up I thought if you have this plate its a small nose, dont go by the plate go by the size of the bolt)
In the above pic u can see the big nose pulley with front plate install (its just super rusty) is very similar to the plate I am holding from the small noise pulley. Dont let this confuse you. Always go by the size of the bolt used to identify the pulley.
Left is a miata UDP pully
Center is a SMALL NOSE pulley
Right is a LARGE NOSE pulley with front plate that looks just like the plate on the small nose
EVERY LARGE NOSE PULLEY I HAVE COME ACROSS HAS A DIFFERENT BACKING PLATE PIECE (the part that is held by the 4 x 10mm screws). Just use whatever backing plate your engine came with.
Just to reiterate this again, my GTR, the miata 1.8 large nose and 2 x Escort GT LARGE NOSE all had slightly different backing plates that get held by the 4x10mm bolts and have the groove for the key.
Is there any advantage to using one plate over the other?
My guess is probly not. They look 99% identical, just slightly different thicknesses/design. If I weighed them all maybe there is a slight difference but it isnt much.
I believe you can use any of the big nose plates with any of the big nose pullies. Im just sticking with the one that came on my motor and keeping the others as spares.
You may notice that your BIG NOSE/BOLT pulley has a plate on the front. That is fine and does not mean you have a small nose.(this is where I screwed up I thought if you have this plate its a small nose, dont go by the plate go by the size of the bolt)
In the above pic u can see the big nose pulley with front plate install (its just super rusty) is very similar to the plate I am holding from the small noise pulley. Dont let this confuse you. Always go by the size of the bolt used to identify the pulley.
Left is a miata UDP pully
Center is a SMALL NOSE pulley
Right is a LARGE NOSE pulley with front plate that looks just like the plate on the small nose
EVERY LARGE NOSE PULLEY I HAVE COME ACROSS HAS A DIFFERENT BACKING PLATE PIECE (the part that is held by the 4 x 10mm screws). Just use whatever backing plate your engine came with.
Just to reiterate this again, my GTR, the miata 1.8 large nose and 2 x Escort GT LARGE NOSE all had slightly different backing plates that get held by the 4x10mm bolts and have the groove for the key.
Is there any advantage to using one plate over the other?
My guess is probly not. They look 99% identical, just slightly different thicknesses/design. If I weighed them all maybe there is a slight difference but it isnt much.
I believe you can use any of the big nose plates with any of the big nose pullies. Im just sticking with the one that came on my motor and keeping the others as spares.
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