zyounker

It is just the block. Usually they have new rotor housings and the max of 1 lapped side housing..

They should last about as long as a new engine if they have new housings.

Of course the come with all new seals and i believe a 1 year 12K mile warrenty.


-Zach

Gir

Hey COBALT what color os your RX7, I may have seen it rolling around AF?

Gir

About the side housings, what does lapping them do, and why do they only lap one of the side housings?

zyounker

lapping cleans them off & removes groves.. the reason you only want to do one is the engine will get shorter when doing this.. if you do 2 it might not fit anymore...



-Zach

Gir

Is that lapping the outside of the housing (cant see why it would be) or the inside that connects with the rotor housing?
And if I understand correctly its just to make a cleaner connection and tigher seal with the rotor housing?

zyounker

The side of the rotar rubs against the side housing causing groves in it. that is why they lap it.. to remove these groves.


-Zach

Gir

makes sense.
If my questions are bugging you just lemme know, if not I got lots more

How do they decide which side gets lapped, is there one side of the engine that gets more grooves in it than the other?

zyounker

No, you lap the ones that need to be.. if they both need lapped you will need at least 1 new one.. You only want to use 1 lapped housing otherwise the engine will be to short..

-Zach

Gir

Ok the little lightbulb clicked in my head, that makes a lot of sense now.

How smart (reliability and long lastiveness wise) is it to rebuild your own rotary motor? I feel confident that I can mechanically do it, but I dont know what issues might be involved, like getting new housing or lapping the housings or whatnot.

zyounker

If you are interested i suggest you buy a video on how to do it.. check out http://www.atkinsrotary.com They have a howto video.. I have never rebuilt one before. But a freind and i are pulled his engine out this week & are gonna pull it apart.. For the most part if you screw it up it is a big loss.. it is safer to just buy one.. A seal kit cost ~$1000 so if you mess it up You could be wasting alot of money...


-Zach

Gir

ok when you rebuild a motor (say it has 75K on it) do you only do seals like in a piston motor or do you need to do any housings or the actual rotors or anything??

zyounker

You need to check everything and make sure it is within tolarences... Usually you have to replace at least 1 rotor housing and 1 rotor.. Sometimes they are both bad..

So if your rotor housings, front, intermediate, side housing, & rotors are good the you need to just replace all the seals in the engine including the apex seals & springs...

Gir

Its nice to know that there are videos available to show what the different tolerances are then, doesnt sound too bad, unless the cost of the housings and rotars are alot.

you guys think its worth looking for an r1 or r2 (mainly for the brake cooling vents and the dual oil coolers) or just take any model I can find in good shape and go from there?

zyounker

It depends on what you want to do.. But any model is good.. Rotor housing are expensive.. that is why it might be better to buy a reman..

You can always upgrade the oil coolers & suspension.. If you want a sun roof though, buy a touring....


-Zach