Rotary Car Performance General Rotary Car and Engine modification discussions.

How does my exhaust porting job look?

Thread Tools
 
Search this Thread
 
Old 04-11-05, 01:16 AM
  #1  
Haven't we ALL heard this

Thread Starter
 
Wankel7's Avatar
 
Join Date: Mar 2001
Location: Indiana
Posts: 3,948
Likes: 0
Received 1 Like on 1 Post
Question How does my exhaust porting job look?

Followed the RB template for the street port. Replaced the bevel (chamfer) best that I could. How does it look?

I didn't change the sides to much but opened it up on the bottom to match the exhaust sleeve. I also polished the exhaust sleeve.

Thoughts?

Already had one comment that says I need to increase the amount of chamfer ....

This is my first time...so just want to make sure i didn't F up new housings.




James
Old 04-11-05, 06:13 PM
  #2  
BDC
BDC Motorsports

 
BDC's Avatar
 
Join Date: Jun 2002
Location: Grand Prairie, TX
Posts: 3,667
Likes: 0
Received 6 Likes on 6 Posts
Not bad, James. Clean it up with some sanding and polish it.

B
Old 04-17-05, 11:18 AM
  #3  
Full Member

 
yelwoci's Avatar
 
Join Date: Mar 2005
Location: London, UK
Posts: 60
Likes: 0
Received 0 Likes on 0 Posts
Just FYI
The F1 engine teams would now mount the 'head' and the exhaust header/manifold on a machine that passes a high grit plastic paste backwards and forwards through the port and pipework to ensure a perfect/seemless fit.

If you've got a few $10Ks around..................
Old 04-18-05, 05:46 AM
  #4  
Banned. I got OWNED!!!
 
RICE RACING's Avatar
 
Join Date: Mar 2001
Location: lebanon
Posts: 2,306
Likes: 0
Received 1 Like on 1 Post
Mate, it needs to go bigger everywhere, up/down to the sides, when you look at it from out side you should see not rotor housing edges just sleeve.

I'll take some pics of ones I just complete for a customer.
Old 04-18-05, 03:55 PM
  #5  
Senior Member

 
BNA_ELLIS's Avatar
 
Join Date: Oct 2002
Location: ENGLAND, UK
Posts: 524
Likes: 0
Received 0 Likes on 0 Posts
i'm building a large streetported fd, equipped with a hks t51r turbo
plan on running 25 psi. These are my exhuast ports.
The one on the right is a large exhaust port by Rmagic Japanese tuner that I took out of a car I rebuilt last year, which had to4r turbo and mild street port. The one on the left is mine for a comparison.


rgds
Attached Thumbnails How does my exhaust porting job look?-ex2.jpg  

Last edited by BNA_ELLIS; 04-18-05 at 03:59 PM.
Old 04-18-05, 04:14 PM
  #6  
Banned. I got OWNED!!!
 
680RWHP12A's Avatar
 
Join Date: Aug 2002
Location: chatsworth,Ca.
Posts: 4,666
Likes: 0
Received 1 Like on 1 Post
Originally Posted by BNA_ELLIS
i'm building a large streetported fd, equipped with a hks t51r turbo
plan on running 25 psi. These are my exhuast ports.
The one on the right is a large exhaust port by Rmagic Japanese tuner that I took out of a car I rebuilt last year, which had to4r turbo and mild street port. The one on the left is mine for a comparison.


rgds

ahhh now thats what an exhaust port should look like(the one on the left)... nice!
Old 04-20-05, 03:16 AM
  #7  
Senior Member

 
chuck8313BTSDS's Avatar
 
Join Date: Jun 2002
Location: S.A. Texas/Tokyo Japan
Posts: 420
Likes: 0
Received 0 Likes on 0 Posts
How's these? Ports for my new PT74GTS turbo. Have not decided on the intakes yet.
chuck
Attached Thumbnails How does my exhaust porting job look?-5918.jpg   How does my exhaust porting job look?-21563.jpg  
Old 04-22-05, 07:19 PM
  #8  
Rotary Enthusiast

 
ronbros3's Avatar
 
Join Date: Jun 2004
Location: Austin TX.
Posts: 862
Received 0 Likes on 0 Posts
YOU had better weld up and polish the holes in the sleeve, come on guys, do it right.
Old 04-22-05, 07:39 PM
  #9  
323=redheaded step child

 
BIO3M's Avatar
 
Join Date: Mar 2005
Location: Raleigh, NC
Posts: 57
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by ronbros3
YOU had better weld up and polish the holes in the sleeve, come on guys, do it right.
Err yea, i noticed that too. Hope you dont plan to run that bad boy.
Old 04-23-05, 12:06 AM
  #10  
Haven't we ALL heard this

Thread Starter
 
Wankel7's Avatar
 
Join Date: Mar 2001
Location: Indiana
Posts: 3,948
Likes: 0
Received 1 Like on 1 Post
Hum, okie.... weld up the holes?

So, you could remove the sleeve weld them up? The reinsert?

James
Old 04-23-05, 01:12 AM
  #11  
Full Member

 
Shamrock.James's Avatar
 
Join Date: Nov 2003
Location: Sydney, Australia
Posts: 98
Likes: 0
Received 0 Likes on 0 Posts
could you use that metal putty **** on it? , would make it a LOT easier
Old 04-23-05, 08:38 AM
  #12  
Rotary Enthusiast

iTrader: (1)
 
13btnos's Avatar
 
Join Date: Oct 2004
Location: VISTA
Posts: 797
Likes: 0
Received 4 Likes on 4 Posts
Just keep the insert out who needs it anyways.
Old 04-23-05, 11:32 PM
  #13  
Senior Member

 
chuck8313BTSDS's Avatar
 
Join Date: Jun 2002
Location: S.A. Texas/Tokyo Japan
Posts: 420
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by ronbros3
YOU had better weld up and polish the holes in the sleeve, come on guys, do it right.
Thanks for your "opinion/suggestion". The port size and shape was copied from a rotary shop here in Japan. There was no mention of filling the EGR holes to make the port "done right". Going to finish polishing the ports, then use them with my new turbo, PT74GTS.


chuck
Old 04-24-05, 04:08 PM
  #14  
Haven't we ALL heard this

Thread Starter
 
Wankel7's Avatar
 
Join Date: Mar 2001
Location: Indiana
Posts: 3,948
Likes: 0
Received 1 Like on 1 Post
Originally Posted by Shamrock.James
could you use that metal putty **** on it? , would make it a LOT easier

If you can find a putty that will take 1800F

Not sure JB weld can live up to that. And worst case is that it comes out and hurts your turbine wheel

James
Old 04-24-05, 04:15 PM
  #15  
Haven't we ALL heard this

Thread Starter
 
Wankel7's Avatar
 
Join Date: Mar 2001
Location: Indiana
Posts: 3,948
Likes: 0
Received 1 Like on 1 Post
.........

Last edited by Wankel7; 04-24-05 at 04:19 PM.
Old 04-24-05, 04:34 PM
  #16  
Senior Member

 
Join Date: Jun 2003
Location: Minden, NV
Posts: 494
Likes: 0
Received 0 Likes on 0 Posts
Originally Posted by yelwoci
Just FYI
The F1 engine teams would now mount the 'head' and the exhaust header/manifold on a machine that passes a high grit plastic paste backwards and forwards through the port and pipework to ensure a perfect/seemless fit.

If you've got a few $10Ks around..................
Sounds like extrude honing.
Old 04-25-05, 01:08 AM
  #17  
I wish I was driving!

 
Join Date: Dec 2001
Location: BC, Canada
Posts: 5,241
Received 84 Likes on 68 Posts
Originally Posted by Wankel7
Hum, okie.... weld up the holes?

So, you could remove the sleeve weld them up? The reinsert?

James
You remove the sleeves, and weld the holes in the sleeves closed w/ stainless, then reinsert. You can go even farther and press aluminum plugs into the rotor housing in the exhaust port and then grind them off flush before you reinsert the sleeve.
Old 04-28-05, 09:18 PM
  #18  
Rotary Enthusiast

 
Dom_C's Avatar
 
Join Date: Feb 2004
Location: Freeport, Maine
Posts: 1,225
Likes: 0
Received 0 Likes on 0 Posts
why do you fill the holes?
Old 04-29-05, 01:36 AM
  #19  
I wish I was driving!

 
Join Date: Dec 2001
Location: BC, Canada
Posts: 5,241
Received 84 Likes on 68 Posts
Originally Posted by Dom_C
why do you fill the holes?
Better flow, prevents turbulence, and is one of the methods of filling the air feed from the air pump.
Makes it tough to pass emissions testing if you weld them shut.
Old 04-29-05, 09:55 AM
  #20  
Rotary Enthusiast

iTrader: (1)
 
13btnos's Avatar
 
Join Date: Oct 2004
Location: VISTA
Posts: 797
Likes: 0
Received 4 Likes on 4 Posts
Originally Posted by RICE RACING
Mate, it needs to go bigger everywhere, up/down to the sides, when you look at it from out side you should see not rotor housing edges just sleeve.

I'll take some pics of ones I just complete for a customer.
RICERACING Where are the pictures?
Old 06-19-05, 06:13 PM
  #21  
Moderator

iTrader: (3)
 
diabolical1's Avatar
 
Join Date: Feb 2002
Location: FL
Posts: 10,818
Received 306 Likes on 267 Posts
how many of you guys use a Dremel to cut your exhausts? i'm in the process of doing mine and my the bits that i have don't seem to be going through the sleeve as easily as i figured it should.

any suggestions?
Old 07-20-05, 11:55 PM
  #22  
20BFD

 
black93RX7's Avatar
 
Join Date: Sep 2002
Location: Winnipeg
Posts: 506
Likes: 0
Received 1 Like on 1 Post
I might be porting mine tommorow, the shop that did it last year barely touched the exhaust ports. It looks like they just glazed over them with a dremal. Not impressed at all.

Is a dremal good enough to do the job right?
Old 07-21-05, 12:35 AM
  #23  
Old [Sch|F]ool

 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 12,506
Received 416 Likes on 296 Posts
RB templates suck IMO - open way too early (for a street engine anyway), close way too early.
Old 07-21-05, 12:38 AM
  #24  
Old [Sch|F]ool

 
peejay's Avatar
 
Join Date: May 2001
Location: Cleveland, Ohio, USA
Posts: 12,506
Received 416 Likes on 296 Posts
Originally Posted by yelwoci
Just FYI
The F1 engine teams would now mount the 'head' and the exhaust header/manifold on a machine that passes a high grit plastic paste backwards and forwards through the port and pipework to ensure a perfect/seemless fit.

If you've got a few $10Ks around..................
People who want to build engines that run well in more than a 50rpm powerband leave a "step out" in the airflow, so for instance the header is just a bit larger than the port's exit. Helps prevent reversion.

You want the air to flow in only *one* direction, there is no gain to allowing air flow backwards! The "step" does not hamper forward flow to any significant degree while it puts the hurt on reverse flow.
Old 07-21-05, 02:47 AM
  #25  
Haven't we ALL heard this

Thread Starter
 
Wankel7's Avatar
 
Join Date: Mar 2001
Location: Indiana
Posts: 3,948
Likes: 0
Received 1 Like on 1 Post
To late for me...I used the RB templates...

About 30 miles into my breakin period...

I will keep my thread updated on the power it makes...

James


Quick Reply: How does my exhaust porting job look?



All times are GMT -5. The time now is 09:43 AM.