The ported engine *Paging JEFF20B*....
09-04-07, 02:06 AM
#1
Adolf Hitler Verfechter
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The ported engine *Paging JEFF20B*....
Morning ,
A Few days ago in one of Jeff`s threads ,he mentioned my “ legendary” hahaha over ported housings.
Last night I took so time to go dig out the housing, and some others to compare it to.
Pic :Outside: Look at the size of the port! The branch/header used had to be 2.25” to match up to the OD of the port. The sleeve was also removed. Trigger happy with the porting tool by any chance?
Pic : Inside 1 :The “stock” looking housing is in fact a street ported exhaust, with quite a bit of duration there!Perfect for a nice large 50Deg+ closing Street port.The F#%#% port has wayyyyy to much duration.
Pic: Inside close : I tried to take the pic at a 90deg angle,to give the actual size of the port. Huge isn’t it?
Pic :3 Generations of 12A.Here is a nice comparison shot. Housing on the left is from a +-82. Housing in the middle is from +-1978.Housing on the right is from +-1973,Twin Dizzy.
Pic : Stock VS Ported. The older members here will remember the Smiley port. Does it just take you back???Was how it was done back in the 70`s!The housing on the left is from a later year than the one on the right. They differ by 2 years If I recall properly.
The first few shots is evidence that there was a learning curve in my life as Rotary engine builder/porter.
The engine`s port duration was simply to much to be started with a starter. It could be started by run starting the car. That would result in 1 rotor coming online : Rrrrrrrrrr.put.put.put.rrrrrrr.put.rrrrr and then a few secs later the other one. Haha,what fun that was. Idle was never a long,pulsing BRAP-BRAP like a normal bridge.Rather a very-very fast brapbrapbrap-cough-splutter- shake-shake-brapbrapbrap.
As I remember it came on song at about 7000rpm.It would buck and splutter, cough and carry on at anything below 5000 when driving. I think it idled at min off about 2100+ rpm. Anything below and it would die.
So there you have it! Some info on my STUPID engine.
Karis
A Few days ago in one of Jeff`s threads ,he mentioned my “ legendary” hahaha over ported housings.
Last night I took so time to go dig out the housing, and some others to compare it to.
Pic :Outside: Look at the size of the port! The branch/header used had to be 2.25” to match up to the OD of the port. The sleeve was also removed. Trigger happy with the porting tool by any chance?
Pic : Inside 1 :The “stock” looking housing is in fact a street ported exhaust, with quite a bit of duration there!Perfect for a nice large 50Deg+ closing Street port.The F#%#% port has wayyyyy to much duration.
Pic: Inside close : I tried to take the pic at a 90deg angle,to give the actual size of the port. Huge isn’t it?
Pic :3 Generations of 12A.Here is a nice comparison shot. Housing on the left is from a +-82. Housing in the middle is from +-1978.Housing on the right is from +-1973,Twin Dizzy.
Pic : Stock VS Ported. The older members here will remember the Smiley port. Does it just take you back???Was how it was done back in the 70`s!The housing on the left is from a later year than the one on the right. They differ by 2 years If I recall properly.
The first few shots is evidence that there was a learning curve in my life as Rotary engine builder/porter.
The engine`s port duration was simply to much to be started with a starter. It could be started by run starting the car. That would result in 1 rotor coming online : Rrrrrrrrrr.put.put.put.rrrrrrr.put.rrrrr and then a few secs later the other one. Haha,what fun that was. Idle was never a long,pulsing BRAP-BRAP like a normal bridge.Rather a very-very fast brapbrapbrap-cough-splutter- shake-shake-brapbrapbrap.
As I remember it came on song at about 7000rpm.It would buck and splutter, cough and carry on at anything below 5000 when driving. I think it idled at min off about 2100+ rpm. Anything below and it would die.
So there you have it! Some info on my STUPID engine.
Karis
09-04-07, 10:11 AM
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Too old to act my age
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Considering it was like 5:30 AM his time when you posted that, I'd say it was likely that he was still sleeping.......
Those dern time differences can sure cause confusion.
Nice pics. I bet ya won't port one quite that far again.
Those dern time differences can sure cause confusion.
Nice pics. I bet ya won't port one quite that far again.
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09-05-07, 01:50 AM
#8
Adolf Hitler Verfechter
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I didnt think yoiu slept at all Jeff?With your amount of projects going, LOL
They were in good condition,as per mazda specs.Smiley port does make the older engine builders on the Rx club smile!
Nope,i will definately not go this far again!Must have been a brain glitch in the first place.
Karis
They were in good condition,as per mazda specs.Smiley port does make the older engine builders on the Rx club smile!
Nope,i will definately not go this far again!Must have been a brain glitch in the first place.
Karis
09-05-07, 02:50 AM
#10
I'm glad US spec rotor housings didn't have the three holes. I wouldn't call joining them a smiley port, unless your upper lip kinda hangs a little too low. It looks more like a valentines day kind of thing.
I smile when a port I made performs well. That's the closest I get to a smiley port.
I smile when a port I made performs well. That's the closest I get to a smiley port.
09-05-07, 01:15 PM
#13
Adolf Hitler Verfechter
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Ok,maybe a drunk smiley?haha
Remember guys this was waaaaayyyyy back in the 70`s.Our fist Rx2`s and R100`s had 3 small holes for the exhaust port to keep the noise down.It soon turned into the "smiley" or heart port it you like.The modified port flowed fine,even for a PP back then!
Karis
Remember guys this was waaaaayyyyy back in the 70`s.Our fist Rx2`s and R100`s had 3 small holes for the exhaust port to keep the noise down.It soon turned into the "smiley" or heart port it you like.The modified port flowed fine,even for a PP back then!
Karis
09-05-07, 05:28 PM
#16
jeff
upload it to putfile.com or youtube.com
you may have to create an account
i see lol i didnt really peice the two together but i can see the 3 points"edge's" of the old circle ports.
seems to be lower port timming than the pre82 housings wonder how that sounded
upload it to putfile.com or youtube.com
you may have to create an account
i see lol i didnt really peice the two together but i can see the 3 points"edge's" of the old circle ports.
seems to be lower port timming than the pre82 housings wonder how that sounded
09-07-07, 03:20 AM
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I need a new user title
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I've actually heard this sound clip before. The link I found it at is here:
http://mrec.rotary.net.nz/media/sounds/10app_idle.mp3
If that one goes away, I've also uploaded it myself for redundancy's sake:
http://media.putfile.com/10A-Peripheral-Port-Idling
http://mrec.rotary.net.nz/media/sounds/10app_idle.mp3
If that one goes away, I've also uploaded it myself for redundancy's sake:
http://media.putfile.com/10A-Peripheral-Port-Idling