baycityrides

my F1A still spins for a second after i cut the ignition... it seems new to me but i just caped the cutouts so its a whole new sound... i confirmed it was the blower spinning today, i had a buddy start the car and shut it off and sure as **** it was the supercharger still rotating... i thought i broke something so i pulled the belt off of it and grabbed the pulley and grabbed the impeller and they are still connected... what could be causing it?

haulass350

iTrader: (2)

thats odd, i wouldnt think it would spin since its belt driven, as soon as the engine stops turning so should the blower.

stevieturbo

Are you using one of those clutched pulleys ?

If it's a normal pulley, it should be impossible for it to spin with the engine off as there is a direct mechanical linkage stopping it.

11SECSS

iTrader: (199)

Unless the pulley was put on without the key way.

baycityrides

key is there in the pulley, it has me baffled!

Blackbirdws6

iTrader: (7)

Maybe a large lack of belt tension? Engine turns off and the momentum of the blower overcomes the available grip of the belt just for a second. Just spitballing here.

silver_82

theres a large set up ratio gearset in the procharger. you sure your eyes aren't playing tricks on you as the motor is winding down

baycityrides

that may be it... they are new belts... but ill just have to try it later... every time i fix something, another thing breaks!!

The Alchemist

iTrader: (19)

Is the belt still turning?

Definitely post a video so we can see what you're seeing.

baycityrides

heres a video of it... its still moving air, the sound is normal, just it keeps spinning...

Tally TransAm

iTrader: (17)

wait its an lt1?

has to be an issue with the opti. . .

sorry man, i had too. weird though

11SECSS

iTrader: (199)

I would pull the pulley off to see if the keyway broke would be my geuss.Unless something has broken internally.

baycityrides

key is still in it, but if one of the gears or shaft broke wouldnt it not move air anymore? and wouldnt it be all bound up? thing feels like it did brand new... it just keeps spinning LOL its making me nervous!
should add there is maybe 500 miles on this unit... i had it rebuilt after the cone fell off and sucked its self into the impeller... procharger fixed it for free... as you can hear in the vid it sounds perfectly normal, even the "spin down" sounds like it would if you just spun it with your finger real fast.

haulass350

iTrader: (2)

you can always take and crack the case apart and see if there is anything visually wrong with it. i dont know if i would be running it with it like that haha.

baycityrides

i now have the belts off of it. i had them on just to take this video.

stevieturbo

it's a poor video. Can you show us the actual impeller wheel throughout this test ?

And again, what upper pulley are you using ? Is it one of their clutched/sprag pulleys ?

The Alchemist

iTrader: (19)

I wasn't able to tell in the video, but is the belt to the blower still turning once the motor shuts off?

baycityrides

the belt is stopped., i honestly dont know if the impeller is. there isnt much clearance between the header and the inlet. ill put a belt on and try and squeeze a camera in there... but i thought the sound of it was the important part

11SECSS

iTrader: (199)

Have a buddy start the car while you hold camera but to me sounds like impellere is still spinning or poss a bearing inside is turning ?

baycityrides

thats what i was thinking is one of the "double bearings" they use i guess is still spinning... but its a crap shoot lol