What do you think of these ports?
01-22-06, 09:27 PM
#1
What do you think of these ports?
So, I just got my engine out (I'm excited if you cant tell). So anyway, what do you think of these port jobs? They were done at Alamo Rotary by Tito.
Also, does anyone have a picture of the stock 6 ports? I can't find one for some reason.
Also, does anyone have a picture of the stock 6 ports? I can't find one for some reason.
01-22-06, 10:02 PM
#4
Thanks. I don't know why I didn't think about kevin's site.
So It looks like there was a pretty substantial increase in the port size. I could tell from how it drove, as it made good power almost to 7500 (this is an s4, btw)
Unfortunately, I dont have any money at the moment, so I wont start rebuilding it for at least a month or two.
Edit: I think thats classified as an extended port (or a large street port)
So It looks like there was a pretty substantial increase in the port size. I could tell from how it drove, as it made good power almost to 7500 (this is an s4, btw)
Unfortunately, I dont have any money at the moment, so I wont start rebuilding it for at least a month or two.
Edit: I think thats classified as an extended port (or a large street port)
01-23-06, 12:49 AM
#6
I wish I was driving!
I'll bite.
As far as I can tell, they open very early.... so early that the leading edge of the side seal will not be supported.
There is also no chamfer on the closing edge of the ports.
It looks like that engine will munch side seals pretty readily.
There's quite a bit of induced overlap from those ports. Drivability will be decreased, and the powerband will be shifted upwards.
What do the exhaust ports look like?
I would put quite a bit more work into the ports.
Grab some pictures of the runners, too.
What did you pay for this?
As far as I can tell, they open very early.... so early that the leading edge of the side seal will not be supported.
There is also no chamfer on the closing edge of the ports.
It looks like that engine will munch side seals pretty readily.
There's quite a bit of induced overlap from those ports. Drivability will be decreased, and the powerband will be shifted upwards.
What do the exhaust ports look like?
I would put quite a bit more work into the ports.
Grab some pictures of the runners, too.
What did you pay for this?
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01-23-06, 09:13 AM
#10
Well, this engine actually has about 25k on it with these ports with no problems (related to the ports, at least.) I pulled it because I thought I popped a seal, but they were actually carbon locked in place. The thread about it is here: https://www.rx7club.com/2nd-generation-specific-1986-1992-17/finally-got-engine-apart-now-i-have-some-questions-about-engine-condition-502068/ Feel free to reply to it as no one has yet. 
01-23-06, 10:21 AM
#12
Yeah, it definately had overlap on it. There was a slight lope to it, in addition to a huge lope, but that was from a vac leak that I didn't find until I was pulling off the rats nest. As I said, it made good power to over 7k, close to 7500. To my knowledge, there is nothing done to the exhaust ports. I might get new housings and get the exhaust ported a little on them, since most places wont port used housings. Now that I see the condition of the housings, I might keep them, though. I'll have to look them over more closely to see. This isn't my daily driver anymore, so I might go crazy.
Last edited by Sideways7; 01-23-06 at 10:24 AM.
01-23-06, 12:54 PM
#14
Originally Posted by SureShot
On my housings, I opened the exhaust a little sooner, but left the closing unchanged.
Works good - lasts a long time..
Works good - lasts a long time..
01-23-06, 01:20 PM
#16
Originally Posted by carzy driver
overlap happens when you take too much out going upwards towards the intake. rounding the edges won't hurt too bad, may not even notice
Also, I just realized that I have Turbo housings. In fact, I think I might have gotten new housings with my rebuild. The recipt for the rebuild doesn't have a detailed list (it just says Parts and Lubricants) but the price looks like it includes new housings. Maybe I will just use them after all.
01-25-06, 08:00 PM
#20
Ok, I wasn't sure. It looked like some had been taken off the bottom of the port, but I couldn't tell for sure. Hopefully I can re-use the housings. That'll save me at least a grand after porting is figured in. Is there anything you can do with the housings like take some super-fine grit sandpaper and smooth it down. Seems like I read that somewhere, but I'm not sure.
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