RX3SP

iTrader: (62)

Exactly my point trochoid! That's a dead on assessment.

Rx-7Doctor

iTrader: (13)

This is a shot in the dark. Wonder if the apex springs are upside down on 2 faces of that rear rotor? I know, I'm reaching but the suspense is driving me nuts,lol.

trochoid

iTrader: (6)

Sorry for the correction Doc, but it would only need to be one seal with the springs upside down. If 2 seals were that way compression would be 0 on all 3 faces. You better get out and chase that little piece of brain fade that just ran out the door and catch it.

My vote is for a weak spring under 1 seal, that or it's binding a tiny bit from carbon.

aussiesmg

iTrader: (1)

Or a piece has broken off the apex seal...long shot but...

680RWHP12A

that was in the back of my mind too, besides the stuck seal..... well we will know this week when i tear her down

Rx-7Doctor

iTrader: (13)

What do you mean? My rotors have 4 sides to them

I can't believe I stated that. That "What's left of the little piece of brain fade", has been much faster then me lately.
Thanks for the correction Trochoid.

perfect_circle

im going to go with trochoid on this one, honestly..he knows everything else.

Hit Redline

iTrader: (2)

Ok, we took apart the motor and found 1 apex seal that had broken on both sides, but just the very tips. Not more than a couple of mm. Housing and rotors look great so I am good there.

So now I am going to have the motor rebuilt. I plan on doing a street port and porting the secondary intakes. Polishing the rotor housings. I am also considering dowel pinning the motor as well.

Before I make any final decisions I wanted some advice from the experts here. Consider that my goal is to keep the car on the edge of streetable, but know its not my daily driver.

1. Is dowel pinning worth it? and what is the cost of this.

2. If using all the best parts available want can I expect a rebuild to cost. (rotors and housing are all reusable)

3. Anything I am missing or should consider at this point when rebuilding the motor.

Thanks in advance for your help.

Hit Redline

iTrader: (2)

So now I am going to have the motor rebuilt. I plan on doing a street port and porting the secondary intakes. Polishing the rotor housings. I am also considering dowel pinning the motor as well.

Before I make any final decisions I wanted some advice from the experts here. Consider that my goal is to keep the car on the edge of streetable, but know its not my daily driver.

1. Is dowel pinning worth it? and what is the cost of this.

2. If using all the best parts available want can I expect a rebuild to cost. (rotors and housing are all reusable)

3. Anything I am missing or should consider at this point when rebuilding the motor.

Thanks in advance for your help

85 FB

When I wanted my engine to be rebuilt with a nice port job, slightly higher horsepower for NA FI, and still maintain driveability, I was quoted around $5000.

nick812

1 Not worth it unless you are going to be running High HP

2 you doing all the work or sending them out to have everything sone? You doing 2000 should cover it 5000 if you send them out.

3 List everything you are going to do.

If you really wanitn a good rebuild and 8000 RPM up grades. Lap the plates new everything expect to spend big $.

Hit Redline

iTrader: (2)

Thanks for the response. I was quoted $6000 but that was with the dowel pinning and some other goodies. I am just getting a feeling what other people are paying for a rebuild.

Hit Redline

iTrader: (2)

What is considerd high horsepower? My goal is around 500hp.

I am having the work done.

I don't know the details of all the parts, but I do know the apex seals are to be 1 piece, corner seals are beefer than stock. I am also porting the exhaust ports to a street port, porting the secondary intakes and polishing the rotor housings. God this is getting really expensive.

Hyper4mance2k

iTrader: (40)

I could almost garentee it's chipped apex seals. you can chip a cornet and it'll still run except with a loss in power and a weird intake noise.

perfect_circle

he already told us what the problem was...