Hey guys, I've got a 94 f150 4.9l I've had for a while and wanted to get more performance. I was recommended to port and polish the intake and exhaust. We found out they used abrasive material to do it like gritty sand. So I got with my friend that tunes Hondas and we decided to try it ourselves. We got a bag of sandblasting sand and hooked up into the intake and started the truck. We had to hold the gas so it would run. He wanted to let the engine suck in the sand through the intake so it would port it out and then push it out the ehxaust so it would port the exhaust manifold.
I was worried that it might cause problems but he figured it'd be OK as long as we kept the Rpms up. After running the truck
and letting it suck in sand we got about half way through a 25 lb bag. The check engine light was on and the engine was bucking and kicking and sounding really weird. We stopped and hooked the truck back up normal and took off the sand supply. We tried to start it again and it was really hard. Once started it couldn't idle and kept making weird noises. We took it out and drove it and it started to make scraping and knocking noises.
Help! Can anyone tell me what to do! My buddy only does Hondas so he doesn't know much about Fords.

 

Laughing my a** off right now

 

I hope this is a joke. If not, prepare for an engine rebuild.

 

This was a terrible idea. You have ruined the engine.

This reminds me of a story where a guy siliconed his computer tower and dropped it in water, believing it to be the same as water cooling.

You may as well cut your losses and scrap the engine and scrap the truck too. There's no reason to even drive it again.

You may want to ask the mods to remove your posting to prevent further replies and/or embarrassment.

 

Bahahaha. When in doubt, "throttle out"

 

Wait, which sand blasting media did you use??

Damn man, I hope you didn't use the plastic media or the silicon carbide media! You have to use the crushed glass grit or glass beads media!!

Oh man, oh man, oh man, I pray you used the glass because if you didn't, you're in for a long rebuild.

Dooooood.......even the walnut shells are too much!!

Stewart

 

Walnut shells only work if it was originally a flex fuel vehicle. I don't think ford ever made a flex fuel 300, so technically you're correct about not using walnut shells.

 

Lots of people don't realize that, but I didn't wanna muddy the waters by bringing that into the discussion. I just know some people have suggested it would be ok (not here at FTE. We're MUCH smarter than that! ) and I wanna make sure the OP knew it isn't ok.

Stewart

 

O wow....and I got made fun of for making a glasspack expecting it not to work.....

 

 

I know what went wrong...

you envisioned "4.9L" and "performance" in the same thought process. Not gonna happen even with TWO 25 lb bags of sand. Just do a motor swap instead... I did this exact same procedure on my 351 and now it'll outpull any 460 on this forum! And that was using cheap Harbor Freight blasting sand.

 

I might do this to my 460, it would out pull a new 6.7PSD then!

 

SUPER Fake. I have seen this floating around the internet for almost ten years now.

 

Don't know what could possibly be wrong. This process worked purfeckedly for me. Bet mine is putting out close to 300 hp now. You shoulda used the fine-grained play sand from Home Depot. Try it with that on your buddy's honda, and feed the sand in more slowly while keeping the RPMs up to like 6000.

 

well, i know exactly what you did wrong.
the process you used works for the smaller honda engines, but not for the large engines found in fords. to use regular sandblasting sand to port and polish the intake and exhaust in a ford, you first need to mix the sand with a lubricant, preferably 50 weight high detergent motor oil.
the oil supplies the needed lubrication, and the high detergent content helps keep the area clean.