renown26b

i was wondering if any one knew what you have to do to replace the 2mm apex seals with 3mm. im going to do a rebuild but i want to know if its complecated to do 3mms.

First gen man

iTrader: (24)

have to bore at your apex seal slots on the rotors.

Turbo II-FB

3mm seals are usually over kill unless you plan on making higher boost numbers. If you plane on running really high boost I would go with solid corner seals

elegance

Always best to look at your manual. If you plan on adding a turbine, then it would be best to change out the Apex seals and apex springs. When you look at your rotors from top view with the ring gear facing upwards, measure the bore of the rotors with a micrometer. If it's not as specified in the manual, then you know you need to change out the apex seals and springs because the clearance between the bore and springs are no good. The bore would be slowly wearing out. When changing to 3mm seals and springs, allign them from top to top and make sure they are even. This ensures even combustion. When placing the seals and springs back, there are 3 things to know. 1) If the apex seals are specified evenly, you can use the seal. 2) If one of the seals are specified differently from reccomended than the other seals, change the seals. 3) If both seals are not reccomendedly specified, replace the rotor. Remember to check clearances also with the bores and the original spring and seals. This is how you can save time in already having knowledge that your rotor bores are still in good shape. If not, replacing 3mm seals and springs would just be a waste and it would be a dying rotor that will give out soon. The manual also has specified clearances with ring gears, ring seals and sleeves. All these are important to check using a micrometer now that you have taken apart the engine so you don't waste time and the job.

Aaron Cake

iTrader: (1)

There's no advantage to 3MM seals. They are only marginally stronger in the real world, and don't seal as well as their 2MM counterparts.

Most people go to 3MM seals to reuse rotors too worn for 2MM.

NOPR

3MM seals are over-rated. If you know how to tune, you dont need them unless you're running some crazy boost (20+), and even then it cant be proven that they're much better.