SLP Runner porting techniques?
#1
SLP Runner porting techniques?
I'm in the process of porting my SLP runners and I'm trying to figure out if there's any realistic way to open up the diameter of the runners short of extrude hone or cutting them apart then welding them back together. I've looked at some flexible rotary attachments, but most of them seem to have a head that's almost as long as my rotary tool itself, and will provide little or no benefit. I'm not aware of any curved or angled rotary attachments that would be of any benefit. Has anybody found a decent way to get at the middle of the runners?
#2
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Car: 67 ******mobile
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Re: SLP Runner porting techniques?
Done it a number of times you have 2 options Im aware of
Take that dividing wall down a few inches til you can get your tool in there (honestly its a pain and not super effective) or get creative, cut it open port then reweld..if you really want results.
If you just take the wall down from the front youll need to buy a 6" long carbide, a mandrell for your cartridge rolls. A 1/2" dia egg shaped usually gets it done. Single or double cut doesnt matter (double easier to control). Go easy on the speed.
Take that dividing wall down a few inches til you can get your tool in there (honestly its a pain and not super effective) or get creative, cut it open port then reweld..if you really want results.
If you just take the wall down from the front youll need to buy a 6" long carbide, a mandrell for your cartridge rolls. A 1/2" dia egg shaped usually gets it done. Single or double cut doesnt matter (double easier to control). Go easy on the speed.
Last edited by cuisinartvette; 07-02-2012 at 02:37 PM.
#3
Re: SLP Runner porting techniques?
I've taken the wall down from the top already. What I'm hoping to do is to open up the diameter of the individual tubes from that point on. I may not be able to (I'm not cutting them open and re-welding), but before I cry uncle, I at least want to see if there's an "easy" option that I hadn't thought of.
#4
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Re: SLP Runner porting techniques?
I have no idea how it would work but, I looked on internet some time ago for ball hones, thinking one might work for this king of thing. The company I found makes flexible ball hones in all shapes, sizes and grits. I just dont know if it would be flexible enough to go around the bend in the runner.
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Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: SLP Runner porting techniques?
Best bet is to get a 6" carbide youll need the length. It will take some time and patience to make it worthwhile as theres less leverage and control on it..may not even be purty but it will remove the metal which is what counts. I have some pics of some SLPs I did awhile back but cant find the internal pics only the outside polish. A REAL suicide mission is attempting the same on Accels. Longer and more difficult
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#8
Re: SLP Runner porting techniques?
So far what I've found agrees with what you've seen. The flexible shafts with a 1/4" collet have such a long hand piece that I doubt it'll reach any farther than a 6" carbide. The 1/8" collet extension for a dremmel may provide more flexibility, but I'll be there for a month of sundays trying to take material away with a dremmel tool. Unless I can rig up some sort of narrow belt sander contraption, I'm starting to think that cutting away a little more of that divider wall may be my only real option.
#9
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Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: SLP Runner porting techniques?
Yep pretty much.
You are correct on the dia getting big as you can If I remember right there is more material on the inside of the runner than the outside wall.
Many think siamesing will give them the gains, not so. Thats just the entry way to a job thats hell. lol.
You are correct on the dia getting big as you can If I remember right there is more material on the inside of the runner than the outside wall.
Many think siamesing will give them the gains, not so. Thats just the entry way to a job thats hell. lol.
#10
Re: SLP Runner porting techniques?
I did mine with large cross buffs.
http://www.summitracing.com/parts/SAI-260013/
Start with the blue ones and then use the red.
http://www.summitracing.com/parts/SAI-260013/
Start with the blue ones and then use the red.
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Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: SLP Runner porting techniques?
Youre on the right track Jim knock that wall down then enlarge the entire opening (dia) slowly making your way down. The wall/floor that faces the injector is much thicker so you can go to town there. Then youll find that carbide gets right down in there no problem. Little at a time.
Think most dont really dig down far enough in these castings to get that turn min. working good, thus disappointed with gains.
Think most dont really dig down far enough in these castings to get that turn min. working good, thus disappointed with gains.
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Car: 1989-92 FORMULA350 305 92 Hawkclone
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Re: SLP Runner porting techniques?
Some pix of how I did mine. Still working on them.. I was going to mill the centers out from the backside but I haven't got around to that yet :-/
Last edited by TTOP350; 07-09-2012 at 02:52 PM.
#14
Re: SLP Runner porting techniques?
Im thinking of welding in some sections of the outside runner to grind away the inside to make the airflow more smooth. For some reason, I think SLP had a blind person design these runners. Inside the runner, there are these huge dents that give clearance for the mounting bolts.
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Car: 1989-92 FORMULA350 305 92 Hawkclone
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Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: SLP Runner porting techniques?
Thats what I did but I just ground them until they were smooth then welded them up. Its a very small hole to weld
#18
Re: SLP Runner porting techniques?
This is as far as I got down with my SLP's. I had Darin Port mine, but I decided to take out my Dremel and sand down deeper. This is as far as I got with my dremel. But notice the indentions from the mounting bolts. I think its a significant obstruction. Im gonna fill in the indentions from the outside but only the lower and rear sections. I dont want to make the front of the runners look like doodoo and mess up the clean look.
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#19
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Car: 1989-92 FORMULA350 305 92 Hawkclone
Engine: 4++,350 & 305 CIs
Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: SLP Runner porting techniques?
All those are gone on mine. I don't have the coolant lines coming off of my T-body sooo the big indentation got filled in and opened up.
#21
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Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: SLP Runner porting techniques?
If youre careful you can make welds virtually disappear
Some SLPs. Someones "plenum.com" got ahold of these and cracked them ina vise so I got them welded up and blended it all in prior to porting (which I WISH I had pics of)
Unless you port these all the way through youre throwing your money down the toilet
Getting the flash off is not going to do anything. Dig into them, get yourself some volume
that scuffing is what someone called "ported". poor guy
Repairs undetectable even polished up perfect
Some SLPs. Someones "plenum.com" got ahold of these and cracked them ina vise so I got them welded up and blended it all in prior to porting (which I WISH I had pics of)
Unless you port these all the way through youre throwing your money down the toilet
Getting the flash off is not going to do anything. Dig into them, get yourself some volume
that scuffing is what someone called "ported". poor guy
Repairs undetectable even polished up perfect
Last edited by cuisinartvette; 07-09-2012 at 08:44 PM.
#23
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Car: 67 ******mobile
Engine: 385 Solid roller
Transmission: T-56
Axle/Gears: 4.11
Re: SLP Runner porting techniques?
What you could do is just sand them down smooth fill any teeny voids with alum. rod/JB then paint. Still a pain though lol.
Youre right polishing these...nightmare
Had that happen to a members Accels noone could tell there was anything done once painted.
Youre right polishing these...nightmare
Had that happen to a members Accels noone could tell there was anything done once painted.
#24
Re: SLP Runner porting techniques?
Or I could just cut out the inside of the runners, and grind out the runner divider so that instead of having 2 little tubes, there will be 1 large oval runner. Then I can just Siamese my intake base. I'm very close to making that a possibility. What do you think?
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Car: 67 ******mobile
Engine: 385 Solid roller
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Axle/Gears: 4.11
Re: SLP Runner porting techniques?
That would put you at the point of a superram...or miniram
On a 350 I wouldntcut it all out and siamese base etc maybe somoene who has tested something like that may know better for your application. If it were me Id just take the dividing wall down a few in so you can get access to that turn and spend a whole lot of time on the rest of it dont siamese the base just port the living dog snot out of it.
Thats just me though doesnt mean its right. Those AFR heads will still starve the TPI but it will sure wake up if you put the time into them.
Last superram I did filled a 1 lb coffee can full of shavings not including the walls that were milled down or all the stuff that fell on the floor. Compacted it good to get it all in there too. It takes time but if youre patient youll be rewarded with a true increase you can feel and see on your time slip.
If you just scuff and smooth like the pic I posted of those SLPs youll be pissed it will feel the same
On a 350 I wouldntcut it all out and siamese base etc maybe somoene who has tested something like that may know better for your application. If it were me Id just take the dividing wall down a few in so you can get access to that turn and spend a whole lot of time on the rest of it dont siamese the base just port the living dog snot out of it.
Thats just me though doesnt mean its right. Those AFR heads will still starve the TPI but it will sure wake up if you put the time into them.
Last superram I did filled a 1 lb coffee can full of shavings not including the walls that were milled down or all the stuff that fell on the floor. Compacted it good to get it all in there too. It takes time but if youre patient youll be rewarded with a true increase you can feel and see on your time slip.
If you just scuff and smooth like the pic I posted of those SLPs youll be pissed it will feel the same
#28
Re: SLP Runner porting techniques?
Incase anybody was wondering, you can go slightly less than this far without going through. You can't really tell in the pics, but those bumps are pretty much completely gone. Out of 10 bumps, I only went through on 2, so I guess that's not too bad. Hopefully I don't go through any more when I clean them up with the sand paper rolls.
JB Weld to the rescue:
#29
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Car: 1989-92 FORMULA350 305 92 Hawkclone
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Transmission: 700R4 4800 vig 18th700R4 t56 ZF6 T5
Axle/Gears: 3.70 9"ford alum chunk,dana44,9bolt
Re: SLP Runner porting techniques?
I loaned them out at one time and they sandblasted and clearcoated em. I removed the clearcoat with carb cleaner because it yellowed in 100miles.
They don't look the greatest but they really picked up several tenths over the stockers and unported SLPs.
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