Side seal springs & Oil Control ring springs questions

Pete_89T2 · 08-24-2015, 07:21 PM

After doing a little research to plan my 1st build, I found that Mazda has different part #'s for the FC and FD side seal springs.

FC part # is N326-11-C17
FD part # is NF01-11-C17

I've read on the other forum that these springs are interchangeable with no ill effects. First, is that a true statement or BS? Second question is, besides the part # and probably cost, what are the salient differences between these part #'s? Is one part # stiffer than the other, and if so, would that be beneficial? Application will be a modified S5 T2. Big street port on new block, so I should be a bit north of 300 RWHP, which is what the current un-ported block is doing, after tuning with all other setup bits remaining the same.

On a similar note, WRT the outer oil control ring springs, Mazda makes a stock and a "competition" version of this part. In this case, Mazda says the competition versions are a little stiffer, which I would guess would reduce blow-by. Is there a downside, perhaps higher wear rate? Would there be any benefit to using these in a street build? They cost about the same, so that factor is a wash.

Thanks!

08-24-2015, 07:21 PM	#1
Pete_89T2 Lifetime Rotorhead Join Date: Apr 2010 Location: Elkton, MD Posts: 874 Rep Power: 16	Side seal springs & Oil Control ring springs questions After doing a little research to plan my 1st build, I found that Mazda has different part #'s for the FC and FD side seal springs. FC part # is N326-11-C17 FD part # is NF01-11-C17 I've read on the other forum that these springs are interchangeable with no ill effects. First, is that a true statement or BS? Second question is, besides the part # and probably cost, what are the salient differences between these part #'s? Is one part # stiffer than the other, and if so, would that be beneficial? Application will be a modified S5 T2. Big street port on new block, so I should be a bit north of 300 RWHP, which is what the current un-ported block is doing, after tuning with all other setup bits remaining the same. On a similar note, WRT the outer oil control ring springs, Mazda makes a stock and a "competition" version of this part. In this case, Mazda says the competition versions are a little stiffer, which I would guess would reduce blow-by. Is there a downside, perhaps higher wear rate? Would there be any benefit to using these in a street build? They cost about the same, so that factor is a wash. Thanks!