2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
Sponsored by:

re-do my 100 mile rebuild

Thread Tools
 
Search this Thread
 
Old 12-10-11, 11:55 AM
  #26  
rotors excite me

iTrader: (16)
 
SpeedOfLife's Avatar
 
Join Date: Jun 2006
Location: Central Iowa
Posts: 4,083
Likes: 0
Received 9 Likes on 6 Posts
yeah, good god my ports look better than that and it was my first time

http://imageshack.us/g/804/p4090028f.jpg/

IIRC I was running short on time and I think my sandpaper mandrel was still being shipped so I assembled as is. Motor pulls hard after 20k miles and doesn't smoke.
Old 12-10-11, 02:03 PM
  #27  
Rotary Freak

iTrader: (16)
 
PvillKnight7's Avatar
 
Join Date: May 2002
Location: Maryland
Posts: 2,597
Likes: 0
Received 2 Likes on 2 Posts
It's like something you'd see in a water plumbing job on a WWII house.
Old 12-10-11, 02:18 PM
  #28  
Original Gangster/Rotary!
Veteran: ArmyTenured Member 20 Years
iTrader: (213)
 
GoodfellaFD3S's Avatar
 
Join Date: Mar 2001
Location: FL-->NJ/NYC again!
Posts: 30,571
Received 554 Likes on 335 Posts
That's one of the worst ports I've ever seen.

I would've tossed those irons in the trash, not used them in a build.
Old 12-10-11, 03:50 PM
  #29  
Moderating the Trochoid

iTrader: (56)
 
RW-7's Avatar
 
Join Date: Oct 2005
Location: Willamette Valley, OR
Posts: 1,899
Received 3 Likes on 3 Posts
I pressure test the coolant system on EVERY rebuild I do.
This is done right after I torque down the tension bolts.
This way if there is a problem, as there was in your case. It can be fixed right away. Not after the engine is installed.
Atkins Rotary sells them for $60. A good investment for any rebuild.
Here is a link to Atkins; http://atkinsrotary.com/store/catalo...t-p-16858.html
Good luck,
-Robert.
Old 12-10-11, 04:00 PM
  #30  
destroy, rebuild, repeat
Tenured Member 20 Years
iTrader: (1)
 
gxl90rx7's Avatar
 
Join Date: May 2004
Location: Charleston, SC
Posts: 2,991
Likes: 0
Received 16 Likes on 14 Posts
those ports will eat your side seals in no time, the top edge should never have a curve to it
Old 12-10-11, 06:13 PM
  #31  
rotors excite me

iTrader: (16)
 
SpeedOfLife's Avatar
 
Join Date: Jun 2006
Location: Central Iowa
Posts: 4,083
Likes: 0
Received 9 Likes on 6 Posts
Originally Posted by RW-7
I pressure test the coolant system on EVERY rebuild I do.
This is done right after I torque down the tension bolts.
This way if there is a problem, as there was in your case. It can be fixed right away. Not after the engine is installed.
Atkins Rotary sells them for $60. A good investment for any rebuild.
Here is a link to Atkins; http://atkinsrotary.com/store/catalo...t-p-16858.html
Good luck,
-Robert.
Sweet! I'll keep that linked for whenever I do my next build.
Old 12-10-11, 09:24 PM
  #32  
Just cruising

Thread Starter
 
alritzer's Avatar
 
Join Date: Oct 2004
Location: Weirton, WV
Posts: 602
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Karack
can't really tell in those pics if that is a casting line or like you said, a repaired crack.

that porting though is hideous, some people simply should not be porting parts.
I'm pretty sure its a repaired hole, I can feel the hole from the inside. My little finger just reaches it.
I agree that some people should not be doing their own porting, the primary porting was actually unusable. Whoever worked on this engine was truely an amateur. Many mistakes were made. I have an extra front iron, I'll try to match the other secondary port.
Old 12-10-11, 09:41 PM
  #33  
Just cruising

Thread Starter
 
alritzer's Avatar
 
Join Date: Oct 2004
Location: Weirton, WV
Posts: 602
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by RW-7
I pressure test the coolant system on EVERY rebuild I do.
This is done right after I torque down the tension bolts.
This way if there is a problem, as there was in your case. It can be fixed right away. Not after the engine is installed.
Atkins Rotary sells them for $60. A good investment for any rebuild.
Here is a link to Atkins; http://atkinsrotary.com/store/catalo...t-p-16858.html
Good luck,
-Robert.
Thanks for the input but I already do pressure test before final assembly. I started pressure testing on my second rebuild. I have the Atkins rebuild video and the mechanic shows how to do it.
The problem on this rebuild started after about two hours and one hundred miles.
Old 12-10-11, 09:55 PM
  #34  
Sharp Claws

iTrader: (30)
 
RotaryEvolution's Avatar
 
Join Date: Oct 2003
Location: Central Florida
Posts: 5,107
Likes: 0
Received 47 Likes on 46 Posts
keep in mind, epoxy won't keep coolant out of there forever. the expansion and contraction rates of the cast iron versus the epoxy will eventually allow it to lose it's seal. in this case allowing coolant to enter the engine from that intake port.
Old 12-11-11, 12:47 PM
  #35  
Just cruising

Thread Starter
 
alritzer's Avatar
 
Join Date: Oct 2004
Location: Weirton, WV
Posts: 602
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by Karack
keep in mind, epoxy won't keep coolant out of there forever. the expansion and contraction rates of the cast iron versus the epoxy will eventually allow it to lose it's seal. in this case allowing coolant to enter the engine from that intake port.
I won't be using a patched iron. I didn't see the patch the first time. Was told that the engine had been ported by a rotary shop in FL. Just another lie.
Old 12-11-11, 12:53 PM
  #36  
Just cruising

Thread Starter
 
alritzer's Avatar
 
Join Date: Oct 2004
Location: Weirton, WV
Posts: 602
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by gxl90rx7
those ports will eat your side seals in no time, the top edge should never have a curve to it
Doesn't the top edge of the port say equi-distance from the coolant seal?
Old 12-11-11, 09:59 PM
  #37  
Rotary Freak

iTrader: (16)
 
PvillKnight7's Avatar
 
Join Date: May 2002
Location: Maryland
Posts: 2,597
Likes: 0
Received 2 Likes on 2 Posts
Originally Posted by alritzer
Doesn't the top edge of the port say equi-distance from the coolant seal?
No.

Look at where the side seals touch the iron and think about how the side seals move over the port. You need to understand how this damage is occurring.

Attached Thumbnails re-do my 100 mile rebuild-port.jpg  
Old 12-12-11, 09:40 AM
  #38  
Just cruising

Thread Starter
 
alritzer's Avatar
 
Join Date: Oct 2004
Location: Weirton, WV
Posts: 602
Likes: 0
Received 0 Likes on 0 Posts
I traced the port on the rear iron and copied it to the front iron. This is what it turned out like. This is my first attempt at porting so I'm sure that it is not perfect.

Is the general shape OK? What does it need done to it?

re-do my 100 mile rebuild-img_5499-resized-3.jpg
Old 12-12-11, 02:06 PM
  #39  
Rotary Freak

iTrader: (16)
 
PvillKnight7's Avatar
 
Join Date: May 2002
Location: Maryland
Posts: 2,597
Likes: 0
Received 2 Likes on 2 Posts
The side seal paths restrict how early the port can open. Does the opening edge of this port violate the side seal path? Does the port closing edge violate the oil control ring path? Does the apex seal move across the top of the port in a scissor path? Did you change the inside of the runner to match the new port face? Did you back-cut the port opening?
Old 12-12-11, 04:34 PM
  #40  
Just cruising

Thread Starter
 
alritzer's Avatar
 
Join Date: Oct 2004
Location: Weirton, WV
Posts: 602
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by PvillKnight7
The side seal paths restrict how early the port can open. Does the opening edge of this port violate the side seal path? Does the port closing edge violate the oil control ring path? Does the apex seal move across the top of the port in a scissor path? Did you change the inside of the runner to match the new port face? Did you back-cut the port opening?
I tried to copy the porting on the rear iron. I'm not sure if the rear iron was done correctly. I did not do the porting on the rear iron. Would you like to port the end irons for me? The mid primary port is OEM.
Old 12-12-11, 09:33 PM
  #41  
Turbo vert

iTrader: (33)
 
just startn's Avatar
 
Join Date: Aug 2005
Location: Elyria, OH
Posts: 2,698
Likes: 0
Received 2 Likes on 2 Posts
http://www.nopistons.com/forums/foru...g-faq-section/

Heres a start. Read read read read read read....and.....read read read read read....apply.
Old 12-12-11, 10:28 PM
  #42  
Senior Member

iTrader: (24)
 
ArmAnirx7's Avatar
 
Join Date: Oct 2011
Location: Torrance
Posts: 506
Received 2 Likes on 2 Posts
Originally Posted by rx7_FREAKKK
On a new engine always check hoses make sure they are tight. and do a shake down test in the driveway Intill warm. and make sure all systems are running right. Because i forgot to tighten a few things down myself. so i always make sure things are good to go. Because you never know. Maybe a heater hose came loose. and the water came out? The water came out fast where ever it came out at. So something gave way.

I dont know what parts can or cant be used after it overheats like that. because now they could be warped. and not be usable. You would have to have them all checked with a micrometer or something to that effect. But On a new Engine i would not let anyone drive it Untill I did a shake down test.

I overly look at my gauges. I mean My eyes are on my gauges when not on the road. because these cars get old. and they just need more attention. Depending how much use it has got. Just hope all those parts are old parts and not brand new housings and irons, That could get spendy. If they were used housings and irons. Then at least the cost should not be to high. I rebuilt my engine for around 550. Oil in water means Bad **** has gone on in that engine, They are not like piston engines. When a rotary overheats its all over. They just cant overheat
I am thinking about rebuilding an engine but I see that the rebuild kits are over a $1000. I am assuming you reused some of the old parts. Which parts are usually reusable? My plan is to get a engine fromt he junkyard and start rebuilding it, maybe even port it, while I drive my rx. After I finish I can swap it.
Old 12-13-11, 01:04 AM
  #43  
Rotary Freak

iTrader: (16)
 
PvillKnight7's Avatar
 
Join Date: May 2002
Location: Maryland
Posts: 2,597
Likes: 0
Received 2 Likes on 2 Posts
http://foxed.ca/index.php?page=rx7manual
Old 12-13-11, 12:06 PM
  #44  
Just cruising

Thread Starter
 
alritzer's Avatar
 
Join Date: Oct 2004
Location: Weirton, WV
Posts: 602
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by ArmAnirx7
I am thinking about rebuilding an engine but I see that the rebuild kits are over a $1000. I am assuming you reused some of the old parts. Which parts are usually reusable? My plan is to get a engine fromt he junkyard and start rebuilding it, maybe even port it, while I drive my rx. After I finish I can swap it.
The first time we rebuilt it we used all new seals and gaskets. We re-used the rotors, housings, irons, oil pump and chain. If I had it to over again...... I would have re-used the apex seals, apex seal springs and side seals and springs because
after I had already purchased all of these parts new, just out of curiosity, I checked the seals and they were hardly worn.
The corner seals were not reusable and the springs were the OEM wire type.
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
rxmiles
3rd Generation Specific (1993-2002)
9
08-24-15 02:07 PM



Quick Reply: re-do my 100 mile rebuild



All times are GMT -5. The time now is 08:34 PM.