jjandros

iTrader: (7)

So I was checking over some of the engine parts I have and noticed that 4 of my rotors have no front or rear note on them. I usually mark them on a piece of tape but the tape fell off. Is there any way to figure out which one came from the front or the rear?

diabolical1

iTrader: (3)

i will assume you're speaking of 13B rotors in which case it doesn't matter. they are completely interchangable as long as the weights remain compatible.

jjandros

iTrader: (7)

I figured they were but I like to label everything and put it back together the same way it came out. As for the interchangable weight I've noticed differerent numbers and lettering across all of the rotor housings Is there a list somewhere that explains this?

diabolical1

iTrader: (3)

there is a reference somewhere that gives the weight ranges. i'll be damned if i can remember where i saw it though (sorry, sometimes i fail to write things down and this was one of them).

anyway, suffice it to say, each rotor will have a letter on it - from A to E. the general rule is that you should never place a pair of rotors in an engine that are more than 2 letters apart without rebalancing the assembly.

as for your particular plight, i really don't know what to say to you. hopefully you're not too OCD to get past never knowing which was which. hypnosis, maybe??? (just joking a bit) but seriously, for the future you can use Ziploc bags.

jjandros

iTrader: (7)

I don't know why I didnt use sharpie or something but oh well now. As for the lettering on the rotors I actually read that same thread earlier but thank you. The question that remains though is the numbering that is on the rotor housings themselves. I have some with a 2, some with a 4, and some with no number on them. I also have one housing thatlooks... weird. The spark plug rings all look the same so that leads me to believe that they're all s4 but near the buottom 7 of them have an indent in them where as the eight has a rounded bulge and no numbering ( I'll post a pic tonight)

diabolical1

iTrader: (3)

my only word of caution about the Sharpie is to keep in mind that the ink is vulnerable to oils and solvents. have designated containers if you'll be storing parts for extended periods of time. when i put parts into storage, i usually put a coating of oil on them and i have a set of pistons and rods that are now all mixed up because the ink turned into nothing more than blue smudges.

i'll just wait for your photos because i can't think of the numbers you're referring to on the rotor housings off the top of my head.

jjandros

iTrader: (7)

I actually went ahead and invested in some used plastic containers yesterday to start storing parts inside away from the weather and moisture in the garage. As for the sharpie it didnt't seem to work well so I think large ziplock bags are now a must. Thanks for the idea. I'll be posting pictures around 3 or 4 PM EST today as aheads up. Thanks again

jjandros

iTrader: (7)

I tried to get on earlier but couldn't attach pictures from work. Here are a few shots.\/




Notice the numbers and letter on the bottom.. any way to understand what these mean?
Secondly, there's one housing that is just plane different. The bottom has a rounded edge with the numbers in different places. The spark covers are the same so I figure they're all S4 and can't figure out why it's different. Any ideas?

jjandros

iTrader: (7)

Ideas?

diabolical1

iTrader: (3)

well, i can't say for sure, but in the photo where you have 6 of them in line, it looks like 5 of them may be S4 housings. i'm basing this solely on the fact that most of my 13B housings here are S4 and they look like 5 of the ones you displayed.

unfortunately, i've never had the opportunity to buy or pull an S5 engine apart, so i can't say for sure. i don't know if the N/A S5 cars carried knock sensors, so i don't know if i should be looking for the provision for one. however, that one housing that you have does bear a resemblance to my S6 housing - sans knock sensor provision, of course. so if it may be an S5. my official answer though is i defer to someone that can be sure as i am not.

as for the numbers on them, i have no idea what, if anything, they mean. sorry.

hopefully someone with more knowledge will chime in from here.

wes1023

Lots of good info

jjandros

iTrader: (7)

Dang I was really hoping to get some info on the numbers/ letter. As you said though, I'm almost 100% sure 5 of the six are S4 but I've never seen one like the sixth. I've never seen an s6 or 20B housing for that matter so it could be just that. My biggest question though would be if it's some sort of aftermarket housing or Japanese/ Australian. Will definitely keep an eye on this post for someone who recognizes it to chime in. Thanks for all your help Diabolical