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Old 11-28-2007, 11:22 PM   #1
Poik
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Default Poik's ported 530

So in preparation for the 1993 B230F that is going into my 744 to replace the tired K-block with a frozen turbo, I spent about 8-9 hours porting the 530 head that came with the engine. I gasket matched the intake, smoothed everything and worked the bowls pretty good. On the exhaust I did a decent amount of bowl work and took a bit of material off the roof. I also polished the exhaust ports. In the combustion chambers I smoothed out the pad next to the exhaust valve, slightly unshrouded the valves, and sanded and polished the whole thing.













More pictures here: www.eric-o.com/gallery2/main.php?g2_itemId=4571

Tell me what you think!
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Old 11-28-2007, 11:27 PM   #2
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es ok
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Old 11-28-2007, 11:32 PM   #3
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Bigger exhaust valves??? Either way, awesome porting job, seems people go a bit crazy and take way too much out. How much are you porting the 90+??
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Old 11-28-2007, 11:32 PM   #4
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geeze, I could use your services to port a head or 2 for me...Whatever you'd charge would be cheaper then paying a machine shop to do that...
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Old 11-28-2007, 11:33 PM   #5
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I like it nice job. Is this your first time porting a head?
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Old 11-28-2007, 11:41 PM   #6
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Tell me what you think!
I'm gonna take a dump in one of your exhaust ports when you aren't looking.
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Old 11-28-2007, 11:46 PM   #7
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Stock valves. I haven't ported the 90+ yet, hopefully tomorrow, but as much as I can get away with, it's going to take a lot longer than aluminum! Yes this was the first time porting a head for me, I wanted to get some good practice in before I do up my 16v. Thanks for the compliments!

OH! And a BIG thanks to John (The Aspirator) for the air compressor! Works a **** ton better than my other one!
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Old 11-29-2007, 12:28 AM   #8
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So have you had the head on a flow bench yet?
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Old 11-29-2007, 01:16 AM   #9
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Nope, not enough time, installing the engine this weekend. This was mainly for practice, though I do expect the head flows a significant amount more than stock. When I do my 16v I will have before/after numbers.
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Old 11-29-2007, 01:30 AM   #10
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it looks dam better than stock
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Old 11-29-2007, 01:32 AM   #11
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Default head work

Nice job. It will help a lot. Between the head work and the manifold improvements. It helps the engine make a lot more power.
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Old 11-29-2007, 02:26 AM   #12
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Nope, not enough time, installing the engine this weekend. This was mainly for practice, though I do expect the head flows a significant amount more than stock. When I do my 16v I will have before/after numbers.
I was always told it was a no no to port heads with out having them put on a flow bench because if all the ports do not flow evenly then it can cause problems. Thats just what I heard.
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Old 11-29-2007, 02:29 AM   #13
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That's a good rule of thumb but if you are careful, know what you are doing, and keep the porting mild it's not a big issue.
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Old 11-29-2007, 02:30 AM   #14
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I was always told it was a no no to port heads with out having them put on a flow bench because if all the ports do not flow evenly then it can cause problems. Thats just what I heard.
Well then 95% of the fast cars on this board must be ticking timebombs then.

I would check CC volume myself, though.
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Old 11-29-2007, 02:30 AM   #15
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Well it's a good thing I repeated the same things on each port then. But seriously, when you get your head flowed, they usually just flow cylinder 1 and give you those numbers, not every cylinder. Also, many professional head porters do not use a flow bench.
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Old 11-29-2007, 03:55 AM   #16
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The stock head has plenty if icky differences in the ports, let alone the manifolds. If you do decent work and pay attention to do the same thing on every hole, I very much doubt that it would be in any way worse than stock.
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Old 11-29-2007, 05:18 AM   #17
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If you get a fresh 1/4" shank carbide burr and have the air compressor to power a die grinder that 90+ wont take more than an hour or so at most. The carbide chews through that cast iron like butter.
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Old 11-29-2007, 05:59 AM   #18
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just ported my 480 head. Ehh, more or less just took away some bad castings and smoothed out a little. Took about 30 min to do.
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But nice work on your head
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Old 11-29-2007, 10:14 AM   #19
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I just came back from a local pro where I took my partially 531 head for some opinions on what to do about the exhaust side. I was told to round off the short side radius as much as possible even to the point of rounding off some the bottom part of the seat. Sounds scary but this is a well respected shop. They build two cycle bikes and racing snowmobiles. They also have a dyno and a flow bench.
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Old 11-29-2007, 10:23 AM   #20
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Originally Posted by Poik View Post
Well it's a good thing I repeated the same things on each port then. But seriously, when you get your head flowed, they usually just flow cylinder 1 and give you those numbers, not every cylinder. Also, many professional head porters do not use a flow bench.
Yeah, that's why I go in small steps in every cylinder and always feel with my fingers the shape of each port after every small step. It is very difficult to make them very different this way. Common sense prevails...

Head looks nice, though I might have done a little more de-shrouding on the exhaust valve. I think you know enough to have your reasons though
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Old 11-29-2007, 10:30 AM   #21
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Originally Posted by Boris740 View Post
I just came back from a local pro where I took my partially 531 head for some opinions on what to do about the exhaust side. I was told to round off the short side radius as much as possible even to the point of rounding off some the bottom part of the seat. Sounds scary but this is a well respected shop. They build two cycle bikes and racing snowmobiles. They also have a dyno and a flow bench.
That doesn't sound right. You need that short side radius to get even flow through the bowl don't you?
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Old 11-29-2007, 06:42 PM   #22
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Yeah like James said, the stock casting already has discrepancies between the ports, especially in the bowls. The pictures don't do it justice, to really know how the ports turned out you would just have to use your finger, that's where the huge difference over stock can be easily determined. On the short side radius i just lightly sanded the sharp edges so that now it's a smooth sharp angle instead of a sharp sharp angle
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Old 11-30-2007, 08:39 PM   #23
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Just finishing up porting the 90+, didn't take too long. God, this engine is going to rape.
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Old 12-01-2007, 06:47 PM   #24
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Any metal left between the coolant passages and the top of the exhaust runners?

Just because something looks pretty doesn't it mean it actually will act pretty. But I'm not saying that it won't act pretty either...
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Old 12-03-2007, 12:29 AM   #25
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Yeah there is some left. There are a few small holes here and there, but I don't think I will have to worry about them, as when I'm in boost the pressure shouldn't let any water in, and I plan to be in boost most of the time.
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