93 head port & polish progress pics (56k a little slow) - Page 5 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


Performance, Brainstorming & Tuning Talk about modifications, or anything else associated with performance enhancements. Have a new idea for performance/reliability? Post it here. No idea is stupid! (please use Detailing and Appearance for cosmetic ideas)

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Old 09-22-2005, 06:53 PM   #41
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Quote:
Originally Posted by big_news_1
Are you unwilling to provide a similar template for Series 2 folks? Myself and MyLittleBlackBird have been working on a homemade P&P for my S2 heads, and I have a feeling we did it "wrong." It would be greatly appreciated if you could create a resource for the S2 crowd that doesn't have $1500+ to spend on aftermarket head porting. What do you say?
I don't know where you are getting that wrong crap from. I don't feel I did anything wrong. The only RIGHT way to see what works and what doesn't is by putting the heads on the car. So as soon as you are ready to buy the headgaskets, bolts, etc... you bring your car home and I'll swap em out on the weekend.
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Old 09-22-2005, 09:48 PM   #42
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Quote:
Originally Posted by ssei1995
Nothing like a man that knows his chemicals (Toluene) and beverages (Beer).
Got it covered.


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And a six-pack of NGK TR6 plugs in the back seat.
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Old 09-23-2005, 12:52 AM   #43
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Quote:
Originally Posted by MyLittleBlackBird
I don't know where you are getting that wrong crap from. I don't feel I did anything wrong. The only RIGHT way to see what works and what doesn't is by putting the heads on the car. So as soon as you are ready to buy the headgaskets, bolts, etc... you bring your car home and I'll swap em out on the weekend.
I didn't mean any personal insult, man. I don't want to turn away from the topic of the thread, but I meant "wrong" as a relative statement, meaning that we did it "wrong" according to the new information that has come to light. I certainly don't think you did anything dumb, and I don't think I encouraged you to take too much material out of the port mouths.

You're right though; the true test will come when we get the heads on there. I plan on doing pre-install and post-install dyno runs, so we'll link pictures of our P&P as well as dyno sheets. It should give a good indication of where the powerband changes most, and if our porting was too aggressive or not.
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Old 09-23-2005, 12:53 AM   #44
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Nice choice in beer! One of my favs. . . .
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Old 09-23-2005, 01:21 AM   #45
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Spent an hour removing the receiver hitch from the Zilla, and I'm putting in TR6 plugs now. Gapping at .050". Front three are done, and I'm putting in the rear three shortly. I'll leave the octane alone and see how the plugs do by themselves.

As expected, after a mere 100 miles on the TR55'* (one heatrange colder) they showed clear signs of lean. The lean condition, however, was mostly cleared up late last night and this morning. The Jet Stage 2 PCM clearly learned the airflow of the ported TB.

Tonight'* test drive should tell volumes. Oh, I also retorqued my exhaust manifolds, and I'll re-torque the crossover and downpipe this weekend. They're due at 100 miles, and can cause problems like this.

I also found that the trans shop had loosened my oil dipstic and not retightened it. It'* been rattling on the EM stud. That could have been a source of some false knock, considering the Series 1 only has one knock sensor, and it'* located on the front bank.

I also oopsed and broke the damn dipstic handle breaking the #3 plug loose. Gotta order another tomorrow.
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Old 09-23-2005, 01:28 AM   #46
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Quote:
Originally Posted by willwren
considering the Series 1 only has one knock sensor, and it'* located on the front bank.
OK, I am confused, if a S1 knock sensor is on the front bank, then what the heck did I replace with a knock sensor on the rear bank just under the #2 plug? It looked like a knock sensor. Maybe there is a rift in the space time continuum and I have slipped into an alternate reality.

Sorry, back on topic.
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Old 09-23-2005, 01:29 AM   #47
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Is this knock your still getting with '92-'93 rotors and a 2.2" pulley or is this your "hybrid" with a 2.2" pulley?
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Old 09-23-2005, 03:09 AM   #48
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MyLittleBlackBird and big_news_1,

My comments were never intended to demean anyone; just stating and sharing facts from years of experience. Many people do a lot of hit & miss when doing modifications on their cars. I have learned a lot from the behavior of ports in the flow bench based on the shape, length and entry point of the port. Also, I eventually attach the intake and also an exhaust pipe to see the flow pattern and determine the effect of these items on the flow.

For those that do not have access to a flow bench; you have another powerful option: the internet. Just look at different websites, including Intense and ZZP and take a peak at what they have done to our engines. Also take a peak to some of the top cylinder head builders around the country such as Chapman, Slawsko, CFE, Gessler and many others.

Some good information is available at these sites; they are as follows:

http://www.raceflowdevelopment.com/

http://www.avengercylinderheads.com/volume_velocity.php

http://www.cylinderheadservices.com/tech.html

http://www.hrdracingheads.com/air_flow.html
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Old 09-23-2005, 10:41 AM   #49
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Ok, I may have to re-check my knock sensor location.

I'm still not sure what'* causing my KR, but it'* down to 5 degrees now. Took it out for a drive last night, and it'* pulling harder.

I'd still say hold off on the LIM porting until I get this figured out. I have some other ideas jr's3800 and I worked out last night, but I'll save that for another topic. We should dedicate this one to the Head porting.

I'm not running the hybrid SC yet. I'm running with ported TB, LIM, SC, and Exhuast manifolds. The car is officially 'stronger than before the porting and trans'.
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Old 09-23-2005, 10:57 AM   #50
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If it helps, my 92 L67 has one knock sensor on the rear. The 93 parts L27 has one in the front.
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