Okay, so I believe I have a timing issue because of a mismatched pulley set to my hub on my engine. I was thinking about getting the racingbeat underdrive pulley to solve this issue because it already has the timing marks and the hub built into the unit. I have the front cover hub in my attic from my other engine, can't I just take the hub off of the front cover of my engine (s5 t2) and put the one from my s4 na and fix this mismatch problem?? Or is there some type of difference? Would this fix my timing issue?

 

Series four and five have the same timing. Five and twenty.

All series four and five use an eccentric shaft that has it's keyway at 90 degrees from TDC.

The only thing I don't know for sure is if the indexing pin on the front covers are or are not in the same location. I'd say, yes they are.

My gut says series four and series five should have the marks in the same place. I'm talkiing the five and tewnty degree marks

BUT on the other forum there are folk who say "tisn't so. That the pulleys are matched to individual engines.

I say this is the age of mass production and I find that hard to believe.

I've even taken a series four, first generation, carb front pulley with series four hub on my S4 engine and it matches up just fine, EXCEPT the first gen first mark is at TDC, NOT five degrees ATDC. I'm saying it's TDC matches TDC on my series four engine. Only problem is one of the attach bolts on the first gen won't align with one of the holes in the series four hub.

I've given you two views or sides to your question. You decide.

TDC can be found by putting a fluid in one of the chabers when it is in the TDC position, then slightly moving the rotor back and forth while watching the fluid rise/fall. At the point that the fluid is at its highest point is TDC. How you manage to put fluid in the chamber is not so easy but not so difficult either.

 

well with a n/a the timing isn't much of an issue, i have accidentally advanced my timing and had no harsh effects, if you happen to do that with a modded T2 and the timing is off even a few degrees, well that can be quite a costly mistake... there is a few procedures for checking the timing marks on the forum, i would perform those procedures and verify the marks are accurate.