Compression results in ...
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From: Halifax NS Canada
Rotary Evolution
Joined: Oct 2011
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From: Central FL
5 is fine with a supersonic cranking speed of 300rpms? no, but maybe you misunderstood him.
maybe that is their standard but i would be a little bit concerned that you have a full point difference on the one rotor between faces. that seems borderline low even for average cranking speeds to me(most crank around or slightly below 250rpms).
maybe that is their standard but i would be a little bit concerned that you have a full point difference on the one rotor between faces. that seems borderline low even for average cranking speeds to me(most crank around or slightly below 250rpms).
Last edited by Karack; Apr 18, 2013 at 05:40 PM.
Thread Starter
TROLL
Joined: Jun 2010
Posts: 399
Likes: 1
5 is fine with a supersonic cranking speed of 300rpms? no, but maybe you misunderstood him.
maybe that is their standard but i would be a little bit concerned that you have a full point difference on the one rotor between faces. that seems borderline low even for average cranking speeds to me(most crank around or slightly below 250rpms).
maybe that is their standard but i would be a little bit concerned that you have a full point difference on the one rotor between faces. that seems borderline low even for average cranking speeds to me(most crank around or slightly below 250rpms).
6.2 on the front rotor is way below spec even at 250 RPM
6.9 is minimum @250 RPM.
@292 minimum is 7.6, standard is 9.2
you are at 6.2...
That front housing is all but blown.
The rear is borderline.
6.9 is minimum @250 RPM.
@292 minimum is 7.6, standard is 9.2
you are at 6.2...
That front housing is all but blown.
The rear is borderline.
Thread Starter
TROLL
Joined: Jun 2010
Posts: 399
Likes: 1
is it even worth tunning with cobb? how long till i have problems where a rebuild would be necessary?
At that 292RPM your front is completely gone, and your rear is not strong at 272RPM (passing but low), see the numbers below and attached diagram.
Factory Specs:
Standard @ 250RPM: 8.5kgf/cm2
Minimum @ 250RPM: 6.9kgf/cm2
Standard difference in chambers: within 1.5kgf/cm2
Standard difference in rotors: within 1.0kgf/cm2
Front Specs you should have:
Standard @ 292RPM: 9.2kgf/cm2
Minimum @ 292RPM: 7.5kgf/cm2
Rear Specs you should have:
Standard @ 271RPM: 8.7kgf/cm2
Minimum @ 271RPM: 7.2kgf/cm2
Factory Specs:
Standard @ 250RPM: 8.5kgf/cm2
Minimum @ 250RPM: 6.9kgf/cm2
Standard difference in chambers: within 1.5kgf/cm2
Standard difference in rotors: within 1.0kgf/cm2
Front Specs you should have:
Standard @ 292RPM: 9.2kgf/cm2
Minimum @ 292RPM: 7.5kgf/cm2
Rear Specs you should have:
Standard @ 271RPM: 8.7kgf/cm2
Minimum @ 271RPM: 7.2kgf/cm2
Last edited by Mr.Mango; Apr 22, 2013 at 10:12 PM.
At that 292RPM your front is completely gone, and your rear is not strong at 272RPM (passing but low), see the numbers below and attached diagram.
Factory Specs:
Standard @ 250RPM: 8.5kgf/cm2
Minimum @ 250RPM: 6.9kgf/cm2
Standard difference in chambers: within 1.5kgf/cm2
Standard difference in rotors: within 1.0kgf/cm2
Front Specs you should have:
Standard @ 292RPM: 9.2kgf/cm2
Minimum @ 292RPM: 7.5kgf/cm2
Rear Specs you should have:
Standard @ 271RPM: 8.7kgf/cm2
Minimum @ 271RPM: 7.2kgf/cm2
Factory Specs:
Standard @ 250RPM: 8.5kgf/cm2
Minimum @ 250RPM: 6.9kgf/cm2
Standard difference in chambers: within 1.5kgf/cm2
Standard difference in rotors: within 1.0kgf/cm2
Front Specs you should have:
Standard @ 292RPM: 9.2kgf/cm2
Minimum @ 292RPM: 7.5kgf/cm2
Rear Specs you should have:
Standard @ 271RPM: 8.7kgf/cm2
Minimum @ 271RPM: 7.2kgf/cm2
Thread Starter
TROLL
Joined: Jun 2010
Posts: 399
Likes: 1
that sucks... im not noticing any issues so i guess when i start having them ill get a rebuild.. Possible a bad pump or coils can give bad readings? it has a gutted cat, new spark plugs n wires w premix
Last edited by Lvis; Apr 22, 2013 at 10:41 PM.
Get it rebuilt now before you pop an apex seal which could end up setting you back an extra $2000.
Thread Starter
TROLL
Joined: Jun 2010
Posts: 399
Likes: 1
rebuild questions
There are 3 different shops that mainly deal with rx7's by me and im looking for a rebuild on my 04'. My question is i really dont know the experience these shops have rebuilding out motors..... Is rebuilding a 7 motor similar to ours? If there good at the rx7 rebuilds would that make them qualified to rebuild out motors? I wouldnt mind sending my motor to be built but then i have to pay for the labor of someone removing it and installing it so financially it might not be worth it (im not that mechanically inclined to remove the motor and install a new one)
This thread was inevitable *sigh*
Also why start a new thread? why not just add a post to your existing thread here
https://www.rx8club.com/tech-garage-...1/#post4461502
Im sure they can rebuild the engine for you, remember a cheap rebuild is like a bottle of stop leak its a waste of money and wont last long.
With that in mind there are only a slight handful of reputable shops I would ever let touch my engine and for that your pay for it. It all depends on how deep your pockets go. For that matter everything about our cars require deep pockets and patience.
My recomendations
Pettit
Pineapple
RR
MM
If you can't afford to do it right, then just don't do it.
Also why start a new thread? why not just add a post to your existing thread here
https://www.rx8club.com/tech-garage-...1/#post4461502
Im sure they can rebuild the engine for you, remember a cheap rebuild is like a bottle of stop leak its a waste of money and wont last long.
With that in mind there are only a slight handful of reputable shops I would ever let touch my engine and for that your pay for it. It all depends on how deep your pockets go. For that matter everything about our cars require deep pockets and patience.
My recomendations
Pettit
Pineapple
RR
MM
If you can't afford to do it right, then just don't do it.
Last edited by Carbon8; Apr 22, 2013 at 11:32 PM.
Anyone can pull a motor with basic hand tools, and instructions. Try attempting it, only way to become more mechanically inclined is applying yourself. And it will save you a lot of cash in the process
For builders find a highly regarded one. personally use Pineapple Racing but have heard great things about Pettit, And others
For builders find a highly regarded one. personally use Pineapple Racing but have heard great things about Pettit, And others
