93 head port & polish progress pics (56k a little slow) - Page 6 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 09-23-2005, 11:01 AM   #51
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Maybe that'* what threw me. I've had Jseabert'* out of his L27 a couple times.
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Old 09-23-2005, 12:52 PM   #52
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Willwren, I agree, hold off the LIM porting d=since I am doing some R&D. The distirbution is terrible and some of the runners run extremely lean. I am going to be playing with some dams to see how it would affect the flow and distribution. When satisfied, I will be doing the mods with the TIG welder since I do not like to leave any epoxy in the intake manifold for a street application. Seen too many engines suck the epoxy due to poor surface preparation, poor epoxy quality, or just the epoxy eroding and getting loose.
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Old 09-23-2005, 12:57 PM   #53
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I don't believe my LIM porting caused my lean condition, it was the ported TB. I no longer have a lean condition, as my PCM has adapted now. I have just over 100 miles on it, and it'* pulling VERY strong.
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Old 09-23-2005, 05:51 PM   #54
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Quote:
Originally Posted by willwren
I don't believe my LIM porting caused my lean condition, it was the ported TB. I no longer have a lean condition, as my PCM has adapted now. I have just over 100 miles on it, and it'* pulling VERY strong.
What are your long term fuel trims (block learn)?
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Old 09-23-2005, 06:10 PM   #55
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Let me backstep a bit. I MIGHT still have a SLIGHT lean issue. Remains to be seen. I need some time to fully scan it. Unfortunately, my scantool data must be manually recorded. I've got alot of work to do. I still plan on putting the stock TB back on for more data, but things are much more promising now.
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Old 09-23-2005, 06:49 PM   #56
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Can we split this thread now...it'* getting difficult to follow.

Cheers,
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Old 09-23-2005, 08:24 PM   #57
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Quote:
Originally Posted by ssei1995
No release waiver will be required. After giving thoughts on the subject and reading some of the PM'* I got; I will share the templates with the forum since the market for the Series 1 cylinder heads is not as big big as the Series 2 engines. Just have a bit bit of patience since I have a regular job like most of you do.

Also, I am doing some R&D on the intake too, trying to equalize the flow path on the plenum. Been playing in the plenum area of the LIM with clay and will be testing some ideas on how to improve the distribution without killing the torque. There are some interesting flow patterns that I can see with the food coloring.
Well now seeing how I have a S1 sitting here waiting to get torn apart to see what let go, and I was thinking of rebuilding it, I think it would be a great time to P&P what I can, take my time and see what I can't come up with. I mean pulling and re-installing the engine was the biggest job I have had to do on a car ( newer car, not my old 69 pickup). So now with an engine to pull apart, maybe over the winter I can get things organized and possibly re-build it, with a bit more power. Why not experiment on an engine that I don't really need.
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Old 10-01-2005, 12:58 AM   #58
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Has there been any update on this?? Have you had time to work on it ssei1995?


Just curious since I have now decided to use the bottom end of the new engine and build the heads from the blown engine, wich will include P&P the heads and intake. I just don't want to screw anything up.
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Old 10-01-2005, 07:43 AM   #59
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I have not proceeded to the other head yet and do not plan on it until more information can be gathered. I'm interested in the definition of "floor" and "short side radius", what they are supposed to do and why. I looked at the stage 3 intense heads pictures. they'd have a tough time getting $2k from me because of the small amount of material removed. It'* not making a lot of sence in Randyland.

I feel as if I've taken one for the team. The only good I've done so far is shown what not to do to a cylinder head. It'* a good thing they are spare heads.
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Old 10-01-2005, 11:46 AM   #60
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Quote:
Has there been any update on this?? Have you had time to work on it ssei1995?
I have been a bit busy at my normal daily job and also building a 331CID Ford small block for a friends Factory Five Cobra replica car. Before I get blasted for doing work on a Ford...it'* just extra income.

I will be on the flow bench doing some more work next weekend on the ports. I have seen vast improvement on the velocity by straightening the exhaust runner. If you take a look at the exhaust runner, one of the walls is not straight. Also the floor is too high on the exhaust side and the short radius needs to be blended considerably. The addition of the larger valve helped open up the intersection to the short radius. The mods include modifications to the combustion chamber to unshroud the larger valves. I will keep you tuned as I proceed with the mods. I will be posting some pics soon.

Quote:
I'm interested in the definition of "floor" and "short side radius", what they are supposed to do and why. I looked at the stage 3 intense heads pictures. they'd have a tough time getting $2k from me because of the small amount of material removed. It'* not making a lot of sence in Randyland.
Randy, read some of the articles I posted the links in an earlier message. Like I said before, when you are talking about cylinder head ports, bigger is not better because you can kill the port velocity. Port velocity makes power, not big flow numbers. That is the reason why the Intense cylinder heads have smaller ports.

Years ago I built an engine with cylinder heads that flowed 22% less than an identical competitors engine; my engine made about 42 more horsepower than the other engine on the same dyno. The other engine woould fall on its face at 8,200 while my engine had a flat torque across the RPM range and made power all the way up to 8,600 RPM.

Our cylinder heads can make the power, however, the intake leaves a lot to be desired. I am also playing with the intake by adding clay to the floor to equalize the flow to all the runners. Add the end, I feel I will end welding dams to distribute the flow in a more efficient way. This will prevent some runners to run lean under boost.
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