I'm having a nice time rebuilding and reworking my intake. There seems to be lots of room for improvement in air flow and I am now wondering how I can smooth and "bore out" my intake runners. The idea I have is to use a flexible extension on an electric drill with one of those round grinding bits at the end of the extension. Has anyone ever worked their intake runners using a different technique? I know someone here has a great answer to this post.
ain't gonna pay for "extrude honing"
- Thread starter discotech
- Start date
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twr
whoohoo
I reworked mine with a carbide bit on a pneumatic die grinder, followed up by different grit sanding drums to polish it out.
I was not able to completly polish the long runners the way I wanted to. I did manage to get in about 4" to 6" at depending on the runner shape.
I also open up them up a bit. I used the old gaskets as a guide. I took as much as an 1/8" of material out in places. If I remember, I'll take pictures and post later.
Also see http://www.shoforum.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=2;t=001891 here. These guys might have a few tips for you.
I was not able to completly polish the long runners the way I wanted to. I did manage to get in about 4" to 6" at depending on the runner shape.
I also open up them up a bit. I used the old gaskets as a guide. I took as much as an 1/8" of material out in places. If I remember, I'll take pictures and post later.
Also see http://www.shoforum.com/cgi-bin/ultimatebb.cgi?ubb=get_topic;f=2;t=001891 here. These guys might have a few tips for you.
MGidish
SHO Member
IMO, if you want EH you should get it done right. What good is opening up the first few inches? Unless it is done all the way through i dont think it is gonna help at all. The air will still bottle neck and the points you couldnt get to with the grinder. in turn interrupting the smoother flow of the air before you did any grinding.
First I think the yellow intake on a blue SHO works great, good detail on the other engine parts. Put a bigger image up if you can. There are some guys on another thread doing some intake work with pictures. I have to be able to get ALL the way through my runners. So far nothing has been suggested besides the flexible extension on an electric drill.
RStalveyARFF
too many shos
Terry, wait till you place that gasket on the heads! You'll **** yourself!!!!! I took out at least 1/8" of material all around on the heads I just did for my car.
MGidish
SHO Member
Hey thanks Disco! I have a few pics up on photoisland.com.
User: MGidish
Paswd:92SHO
User: MGidish
Paswd:92SHO
twr
whoohoo
If you saw what I saw - anything would be an improvement. Seriously - it had a very rough sand casted appearance.
I smoothed out the long runners and opened the secondary runners (where it counts) I have set the project off to the side and need to finish them up.
DeaconBlue
SHO Member
I gasket matched the intake ports and runners after I had them extrude hone. There was quite a bit of core shift in the castings and I used 1/4" & 1/2" sanding drums and an air tool to do the work.
billyshoe
New Member
The intake runners are not a very restrictive component. The extrude honing will remove the material equally threw the tubes. theres not much point in grinding inside there or hand working it if you can't achive consistant material removal threw out the runner it may cause more harm than good. a bottleneck of a lesser degree. besides, restriction does'nt really get serious until flow reaches the valve, pocket or chamber side. This head flows very good, without modifing. If you stand back 5 feet and take a good look at the intake, that thing has to flow excellent as is. Just look at it! Am I wrong?
shojuan
New Member
It's all about the warm fuzzy feeling one gets from knowing their intake is all nice and clean.
Rich man's hi flow intake: Extrude Honing
Poor man's hi flow intake: $20 of Berryman's B-12
Rick
Rich man's hi flow intake: Extrude Honing
Poor man's hi flow intake: $20 of Berryman's B-12
Rick
The main issue is the gasket matching.The SHO intake runners are severely smaller than the gaskets,and do not match hte plenums well either.Even if the entire runners is not open,matching the ports makes a much better air flow inlet.
RStalveyARFF
too many shos
and if I remember my physics correctly, air flowing into a slightly smaller area will speed it up.
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