Well, i took my intake plenum up to the car wash today, high pressure washed out just the plenum, and now porting part of it, and i notice rust in the inside only, and on the gasket surface, HOW do i get rid of this? what is causing it? i thought aluminum didn't rust. I used tap water also once i got home to flush out the shavings, and prayed some sort of Green Cleaner, and Carb cleaner in side of it, what is causing the rust.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series

http://www.geocities.com/david_angel_16

 

Aluminum cannot rust, however it can corrode, my guess is that the cleaner you are using is too caustic, (maybe it has some kind of acid in it)and is reacting with the aluminum, my beust guess for removing whatever it is, would be maybe soaking it in some kind of aluminum wheel cleaner like eagle one etc..

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87 IROC-z 305 TPI
Borg Warner T-5 fresh rebuild
10-bolt 3.73 Richmond gears rebuilt GM posi,
formerly BW 9-bolt w/3.45 gears(broke it)
Ported Plenum and Runners Homemade AFPR
ACCEL 8.8 wires, High output coil,and cap & rotor
Bosch platinum + 4 plugs
Ram Air w/ K&N filters,
MAF sensor screens removed, TB coolant bypass
Polyurethane tranny and torque arm mounts
Dynomax catback w/custom tips
K&N oil filter,Mobil 1 synth, Futura GLS Super Sport tires 265/50/15 rear and 235/60/15 front mounted on 86 monte carlo SS rims ,

400 sbc and a 6 spd in the works

 

The brown stuff is not rust. It is the result of EGR and PVC gasses coating the inside of the plenum as they pass through to be burned. Since TPI is a "dry" intake, there is no gasoline running through the plenum and runners that would normally clean out these deposits.

The coating really doesnt hurt much, and carb/fi cleaner works fine to get it off.

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Mike Metzler (Desert86Roc)[*] Check Out:SpeedWorldMotorplex.com[*] Check Out:Chevrolet F-Body Online Part & Illustration Manual[*] www.MetzlerRacing.com

Best ET @ 1250 ft[*] 15.352 @ 91.215 mph (uncorrected)

 

If the Green Cleaner is Simple Green, DO NOT USE!! It permanetly tarnishes the finish! Therek was a post a while back on the appearance board (I think) about someone using it on their wheels & it ruined them. I ruined my nice Aluminum Wiesco Valve Covers too using that crap!

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'91 Z28 1LE; 355, Sportsman II heads, Edelbrock TPI w/ 58mm TB, Tremec TKO 5-speed, 3.73's & much, much more

 

what should i use to clean my TPI system i bought?

 

I use brake cleaner and an old toothbrush to clean parts when disassembled.

 

i was suprised on well carb cleaner did to clean it out, i tried engine degreaser, soaking it in dish soap, high pressure washing. that did nothing, took a simple can of carb cleaner and magic, all the carbon went away.

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- David
88' GTA 5.7L TPI MODS---> air foil, K&N, Shift Kit, 180* therm, TB bypass, Gutted CAT, Flowmaster 80 Series Muffler added to Unkown CatBack, Ported Intake

http://www.geocities.com/david_angel_16