LUPE

1990 Stock vert. New motor has 80 miles on it. No low end power, cruises just fine and the compression is good. Check engine light is on, code 17 o2 sensor and 12 tps. I know this would cause my horrible gas mileage but would this cause the low power?



Is this sluggish power normal for a NA 2nd gen rebuild?

rx7b13

the o2 sensor can if it is detecting warm air. it wont nessecarely make you go slowere but it can hurt you hp and have some side effect on your speed. thats what i think but some one with a better assumption will chime in

91mazdarx7

it's still a brand new rebuild take it easy on it until around 1,500 -2,000 miles it will gain more power and build compression

slip_N_slide83

dont beat on that thing yet, i dont know what RPM range you are doing, but you have to wait about 2000 miles before you start to beat it, change the oil a few times...wait for it

LUPE

I'm thinking a might have installed my fricking ports backwards. Anyone have a picture of how they are inserted?

88t2romad

you mean you 6-port sleeves? if thats the case you shouldnt really be revving it that high wih only 80 miles on it.

LUPE

Wouldn't that affect my low end power?

slip_N_slide83

im not gunna have any of my 6 port stuff in, or the M.O.P. (aka o.m.p.) lol....when they close they holes point down.... so take it all apart and see if they point down, let me know, carefull with the gaskets, .......2000miles!!!....under 4k , they dont have power downlow just wait for it, it will come

BklynRX7

WHat he means is, the 6 ports open at 3800, you shouldnt rev past 4k on a rebuild till after you have 2000 miles on it so the 5/6 ports shoudlnt matter unless theyre stuck open.

LUPE

Okay, so if they are stuck open........ big loss in power at low rpms?

slip_N_slide83

holey **** just wait... look at the pumps, to see if they are stuck open or not, if u need an inch of rod they are open, if u dont they are stuck, try to push them open by hand, vice grips? whatever works, they should not be sticking if it is a rebuild, aka *(all clean)*

88t2romad

i dont have an n/a but im pretty sure that at lower rpm's its better to have the ports closed, they are actuated at 3800 rpms or so. Which would help with high end power. But like said earlier, dont rev it past 4k untilyou have anywhere from 1250-1750miles on it. Many people suggest different mileage, so that is just a general window to go by.

Wankel7

Dude, what part of ... let it break in do you not understand?

Also, code 17 on a s5 is instant limp mode. That kills power.

James

Mx6-Rx7 Addict

Is this your first rebuild?? Did someone else build your 3rd gen??

For starters, goto http://www.rotaryresurrection.com/

Goto tech section, then goto rebuild break in procedures.


Don't take the motor for 4K RPM's until you reach around 1000k miles (or personal preference).

I took my first rebuild to 1600 miles before i even thought about getting on it.

The way you break in that motor will affect how long your motor will last and how strong it will be.


Don't take offense if you already know this info. From what it sounds, it seems you don't know.

-Justin

LUPE

Right right right.......It can rev fine, it just revs slow as ****. Doesn't the limp mode on these second gens limit the rpm/load?

LUPE

I've built plenty of power adder rotaries, rebuilds go straight into the car and to the race track. They get about a 10 minute break in.

I've just been putting around in my vert, though. I have to literally rev it up to 2800-3000 and slowly slip the clutch to get it going. It's gotten better since I've put miles on it but I just didn't think these na motors were so doggy after a rebuild.