Porting & polishing diesel heads - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 98 (permalink) Old 07-23-2009, 04:20 AM Thread Starter
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Porting & polishing diesel heads

Being that I am a rook in the world of porting/head modification, I would like some input on working diesel heads if that is no trouble. Please chime in wether you have a large amount or small amount of experience, everything helps!

One thing diesels do not have traveling through the intake tract with the air is fuel like carbureted gasoline/alky engines do. So there is no worry about puddling & wet flow what-so-ever in the diesel world (YES!!). Which, in my eyes makes me want to polish the intake runners (like the exhausts) and take down (and shape) any potential "turbulence producers" if you will. But havent chatted about it with others yet.

How many have ported diesel heads in here with postive results??? Little or big, improvements are always needed/desired. I came across one thread the other day (can't remember the title - I was skimming through) where one mentioned that a certain head you couldn't reach most of the intake port for doing this. Which brings up more questions.

All "classes" involved here -> Light - medium - heavy duty

Which heads are the pain-in-the-rear to even try to improve??
AND
Which would be easier to improve??

Thanks,
Jim

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post #2 of 98 (permalink) Old 07-24-2009, 02:23 AM Thread Starter
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Hmmm maybe I should mention some heads to get the ball rolling. I remember the DD EGR-15L (2003???) from school having a pretty decent intake runner in comparison to the N14s and Cat 3406Es were not that bad. Although I didnt remember what the ports looked like right under the valves when we had the heads off & valves out.

Could we start off with the 5.9L Cummins or Ford light duty 7.3Ls?? I havent seen any pictures of these heads either. It doesn't necessarily have to be about porting and polishing, can be just something I should look for when I plan to do a port & polish job. For example...... where cracks happen or something that the factory messed up on during casting that needs modification etc. etc.

Any cylinder head conversation is welcome guys & gals!!

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post #3 of 98 (permalink) Old 07-25-2009, 03:44 PM
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https://www.thedieselgarage.com/forum...ad.php?t=74620
in this thread is a pic of a head whith the intake to the head cut of or the make them like it. do you know if this guy has a special head or did he mechien his
also thats what i want to do is porte and polish it makes sence to me to do it
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post #4 of 98 (permalink) Old 07-25-2009, 08:57 PM Thread Starter
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Well after searching a little bit, that might be a factory casting. Unless its aftermarket (don't know what to look for to ID them right off the top of my head though) My guesstimation for right now is, it has been machined to accept that kustom plenum. If it is in fact a aftermarket casting, then, someone changed a mold up to not have the intake box included. I wonder how much ram-affect (if any more) that intake has compared to the other more boxy design cast with the head.

What have you come across when porting these diesel heads???

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post #5 of 98 (permalink) Old 07-26-2009, 07:21 PM
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no man sorry i have not ported them just sme polish on the exaust side along with som gasket mached manafold. and i just did a littel not in the boul or ANY THING but it seems like the ps 66 lights fast
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post #6 of 98 (permalink) Old 07-27-2009, 03:40 PM Thread Starter
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Do you have any pictures of your work Boostenhard, or, just a picture of the port in general maybe? I tried google, but no luck there. Bummer I don't have any diesel heads laying around to investigate!!

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post #7 of 98 (permalink) Old 07-27-2009, 07:30 PM
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No dude, sorry, the truck is together (typing for Cody, (boostenhard))... When I gasket matched the manifold, I took probably about 1/8 inch all around... Because the port on the head is bigger than the manifold, all the exhaust gas smacks the manifold where the 1/8 I took was. It's now free flowing since it's matches the gasket. Also, gasket matched the turbo flange on the manifold... I took up a 1/4 in some areas on that.. It seems to spool faster...

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post #8 of 98 (permalink) Old 07-27-2009, 07:30 PM
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I used a rubber wheel to polish... $50 I bought a nice dremmel kit...

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post #9 of 98 (permalink) Old 07-28-2009, 01:20 PM Thread Starter
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Man, that is a lot of material taken out. Port matching is probably the simplest way of improving flow. I haven't come across that much needed for removal though until now. Interesting why it couldn't have been like that from the factory.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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post #10 of 98 (permalink) Old 07-28-2009, 01:34 PM Thread Starter
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Quote:
Originally Posted by glowplugsr4grls View Post
I used a rubber wheel to polish... $50 I bought a nice dremmel kit...
Yeah, I am still saving up to buy the porting kit to add to the carbide bits I have already and the power tool for doing the job. Unless I just use my pneumatic straight grinder. Haven't looked at polishing pads yet though.

Jim "Iron Giant" Fahlin ~ A high performance car is like a guitar, you have to tune it to achieve your best operation and pull ahead of the competition.

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