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Old 11-25-2005, 09:22 PM   #1
Jordan
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All about my heavily modified m20 head.

Everyone seems to be interested as I'm constantly asked about what I'm doing with it and for pictures etc.

I haven't really showed much of it till now.

What I've done:

Intake ports enlarged slightly to gasket size.
Intake ports heavily ported.
Intake valve guides reduced/smoothed.
Intake bowls heavily worked and smoothed.
Intake valve guide transition knifed.

Exhaust ports greatly enlarged to match gasket size.
Exhaust ports heavily ported.
Exhaust valve guides reduced/smoothed.
Exhaust bowls heavily worked and smoothed.

Combustion chambers recontoured/detextured.
Combustion chamber flycut smooth transitioned.
Combustion chamber removed valve shrouding.

Whats still left to be done:

Combustion chambers polished to a mirror finish.
Exhaust ports minor touchups.
3 angle valve grind.
Resurface sealing surface of head.
Assemble and install!

Head, intake ports:
http://jordan.lodac.com/Images/112505-001.jpg

Head, exhaust ports:
http://jordan.lodac.com/Images/112505-002.jpg

Intake port, closeup:
http://jordan.lodac.com/Images/112505-003.jpg

Exhaust port, closeup:
http://jordan.lodac.com/Images/112505-004.jpg

Chamber close up:
http://jordan.lodac.com/Images/CC.jpg

Also, here is a stock 885 chamber to compare:
http://jordan.lodac.com/Images/CCREF.jpg

Headers/catless midpipes:
http://jordan.lodac.com/Images/Headers.jpg

I will be installing this with my ceramic coated headers, catless midpipes, and with a oil seperation system to keep oily crankcase vapors from entering the intake. I will be installing my rocker arms, rocker shafts, and cam from my current head into this one. Valves, springs, retainers, keepers, etc will be OEM.
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Old 11-26-2005, 03:20 PM   #2
paul christians
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That looks good too me. Jordan do you use as a mirror??hehe..I know that is what is needed the setup..JJ..
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Old 11-26-2005, 09:04 PM   #3
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Three questions for ya Jordan.

First, you say you're using stock valves. Ok. But how much are you really gaining if you port it, yet retain stock valves? Is there bigger intake valves available? Is that the reason you stuck to OEM? just curious....

Second... you also say stock valve springs. And you rev to 7100rpm I believe? How much can stock springs go to before the valves start floating?

Lastly, what rocker arms are you using?

Thanks dude
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Old 11-26-2005, 09:28 PM   #4
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You obviously don't know anything about valves and airflow. I'm NOT going into it here as its far over everyones head. All you need to know is running a +4mm intake valve would give me a 1%HP gain, and cost thousands of dollars in headwork that I cannot do.

Stock springs will float valves at 7100rpm. My current redline is set to 6900rpm. Perfectly fine there.

Brand new stock rocker arms.
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Old 11-26-2005, 09:48 PM   #5
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Quote:
Originally Posted by Jordan
You obviously don't know anything about valves and airflow.
No, obviously I don't. I am 17 Jordan. I am here to learn hence why I am asking questions....
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Old 11-26-2005, 10:09 PM   #6
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that head should flow very nice.
wat tools did u use for enlarging the port? Dremel?
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Old 11-26-2005, 10:35 PM   #7
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Quote:
Originally Posted by craz azn
No, obviously I don't. I am 17 Jordan. I am here to learn hence why I am asking questions....
I'm sorry. I didn't mean for it to come off in that manner.

Quote:
Originally Posted by ZiMMie
that head should flow very nice.
wat tools did u use for enlarging the port? Dremel?
Standard Abrasives Deluxe porting kit. Absolute must for this job. (same exact kit pros use)

Requires a good strait die grinder and an adjustable pressure regulator.

Dremel's are NOT suitable for this task. You will destroy the bearings and overheat them.
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Old 11-26-2005, 10:38 PM   #8
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those looks lke bits. wat drives these things.


*edt* never mind. now i need to find my self an electric grider with a 1/4" collet
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Last edited by ZiMMie; 11-26-2005 at 10:53 PM.
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Old 11-26-2005, 11:33 PM   #9
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Electric grinders will also overheat quickly. Die grinders rock because they are cooled by the constant cool air driving them.
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Old 11-27-2005, 12:45 AM   #10
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will a RotoZip work?
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Old 11-27-2005, 12:55 AM   #11
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No.
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Old 11-27-2005, 01:58 AM   #12
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where can i get a kit like that
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Old 11-27-2005, 02:57 AM   #13
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But, you need to know what you are doing for this, if not you are soo ****ed.....And bye..bye head..I did the head civic back in the day..
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Old 11-27-2005, 10:36 AM   #14
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I bought mine from www.summitracing.com

As Paul said though, you need to know what you are doing and where you can and cannot remove material. While the overall process is easy enough, if done without care it can turn the head into a large paperweight.
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Old 11-27-2005, 11:29 AM   #15
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All in all how much did it end up costing? With all new parts, equipment, etc... not counting labour of course.

BTW, are you going to put a different cam in there? schrick?

T.
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