performance qjet rebuild - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ocbaud · 03-14-2004, 02:15 AM

okay, i'm finally THINKING about using my qjet on my new engine.

it is in a serious need of a rebuild. what all will i need to get to have it perform the way i want it to.

i have NEVER worked on a carb before(other then turning some screws here and there) so you gotta tell me exactly what i need and what i need to do to get my old one off my 305 to run good on my new engine

Russell · 03-14-2004, 02:47 AM

From what I hear it isn't too tough, but I wouldn't know as I haven't attempted it yet...

I'm planning on doing the same with my engine though, running a stock q-jet on the engine.

updatelee · 03-14-2004, 03:46 AM

I just did mine, first one I ever did, it wasnt to bad. I disasembled it on a cookie pan so that when things like springs fell out they didnt roll away. when I took the parts off one by one I put the on a white peice of paper and wrote the part no beside it (when you buy the rebuilt kit they give you an expoloded diagrame with every part #'d) that way I knew what ever part was and where it went back in. I recommend buying the dip cleaner. I bought the gunk brand hydroseal II, I cleaned the carb before hand with wd40 then brake cleaner, and scrapped all old gasket off, it looked pretty damn clean, I put the carb in peices into a pot, dumped 4L of hydroseal ($28cdn) into the pot (clear liquid) and next day the liquid was black, the carb came out looking brand new, it was amazing, it took every bit of everything off, cant recommend it enough, well worth it.

Chris Lee
mrclee@telus.net

Russell · 03-14-2004, 04:00 AM

Chris,

Where did you get the stuff from?

Also, welcome to the forum! I'm a fellow Canuck from near Edmonton, Alberta

chevychic · 03-14-2004, 03:41 PM

Eric,

Get yourself Doug Roe's Rochestor Carb book. He does a good job of explaining each function of the parts in a carb and how to tune it for high performance. He has some great cross-sectioned pics in there so you can see what's going on as you read.

*1FaastC10* · 03-14-2004, 04:16 PM

throw that QJet in the trash, and get one from an older model that is fully adjustable, and free of all that smog crap. or buy a 1904.

beaterC10 · 03-14-2004, 07:53 PM

If you don't to do it yourself I would recommend JET Performance in Cali. They did a rebuild for me a few years back on a early 80s Q-jet. It was the difference between night and day. They will rebuild yours or sell you a rebuilt one.

They tune the carb to your truck's specs, bush the throttle shafts, epoxy the well plugs, and some of the other tricks mentioned in the Doug Roe book.

They weren't cheap, but compared to the cost of a new carb it was reasonable. The best part is they eliminated the stumble most 80's Q-jets seem to have. Nothing like the sound of a Q-jet when the secondaries open up.

ocbaud · 03-14-2004, 08:01 PM

i got mine tuned on my 305 so that it ran great. it just got really crappy gas milage(around 8mpg)

updatelee · 03-14-2004, 08:03 PM

I had cdn tire order a kit in for me, nehoff I think. $25 or something like that. only spring they give you is the accel pump spring, was surprised by that, I figured the kit would have replacement springs for everything. no replacement needles or anything, I think thats normal though that their not included.

Im from chilliwack bc btw, been out to alberta a few times, I got family in calgary and edmonton. nice country out there.

Chris Lee
mrclee@telus.net

03-14-2004, 02:15 AM	#1
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	performance qjet rebuild okay, i'm finally THINKING about using my qjet on my new engine. it is in a serious need of a rebuild. what all will i need to get to have it perform the way i want it to. i have NEVER worked on a carb before(other then turning some screws here and there) so you gotta tell me exactly what i need and what i need to do to get my old one off my 305 to run good on my new engine

03-14-2004, 02:47 AM	#2
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	From what I hear it isn't too tough, but I wouldn't know as I haven't attempted it yet... I'm planning on doing the same with my engine though, running a stock q-jet on the engine. __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

03-14-2004, 04:00 AM	#4
Russell Professional Grade Join Date: May 2003 Location: Fort McMurray, Alberta Posts: 7,915	Chris, Where did you get the stuff from? Also, welcome to the forum! I'm a fellow Canuck from near Edmonton, Alberta __________________ 1995 Chevrolet 2 Door Tahoe (6.6L LBZ Duramax / ZF6 / NP241 with 1 ton solid axle swap)

03-14-2004, 03:41 PM	#5
chevychic Registered User Join Date: Oct 2002 Location: Chanhassen, MN Posts: 1,061	Eric, Get yourself Doug Roe's Rochestor Carb book. He does a good job of explaining each function of the parts in a carb and how to tune it for high performance. He has some great cross-sectioned pics in there so you can see what's going on as you read. __________________ *ChevyChic* 86 Chevy K-10 If I can't be a good example, then I'll just have to be a horrible warning. "You're braver than you believe, and stronger than you seem, and smarter than you think" - Christopher Robin

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03-14-2004, 03:46 AM	#3
updatelee Registered User Join Date: Feb 2004 Location: Lancaster Park, AB Posts: 38	I just did mine, first one I ever did, it wasnt to bad. I disasembled it on a cookie pan so that when things like springs fell out they didnt roll away. when I took the parts off one by one I put the on a white peice of paper and wrote the part no beside it (when you buy the rebuilt kit they give you an expoloded diagrame with every part #'d) that way I knew what ever part was and where it went back in. I recommend buying the dip cleaner. I bought the gunk brand hydroseal II, I cleaned the carb before hand with wd40 then brake cleaner, and scrapped all old gasket off, it looked pretty damn clean, I put the carb in peices into a pot, dumped 4L of hydroseal ($28cdn) into the pot (clear liquid) and next day the liquid was black, the carb came out looking brand new, it was amazing, it took every bit of everything off, cant recommend it enough, well worth it. Chris Lee mrclee@telus.net

03-14-2004, 04:16 PM	#6
1FaastC10 Account Suspended Join Date: Oct 2002 Location: Elkhart, IN Posts: 6,399	throw that QJet in the trash, and get one from an older model that is fully adjustable, and free of all that smog crap. or buy a 1904.

03-14-2004, 07:53 PM	#7
beaterC10 Senior Member Join Date: Jul 2003 Location: Indianapolis, IN Posts: 1,277	If you don't to do it yourself I would recommend JET Performance in Cali. They did a rebuild for me a few years back on a early 80s Q-jet. It was the difference between night and day. They will rebuild yours or sell you a rebuilt one. They tune the carb to your truck's specs, bush the throttle shafts, epoxy the well plugs, and some of the other tricks mentioned in the Doug Roe book. They weren't cheap, but compared to the cost of a new carb it was reasonable. The best part is they eliminated the stumble most 80's Q-jets seem to have. Nothing like the sound of a Q-jet when the secondaries open up.

03-14-2004, 08:01 PM	#8
ocbaud Garage Queen Material Join Date: Oct 2002 Location: USA Posts: 4,129	i got mine tuned on my 305 so that it ran great. it just got really crappy gas milage(around 8mpg)

03-14-2004, 08:03 PM	#9
updatelee Registered User Join Date: Feb 2004 Location: Lancaster Park, AB Posts: 38	I had cdn tire order a kit in for me, nehoff I think. $25 or something like that. only spring they give you is the accel pump spring, was surprised by that, I figured the kit would have replacement springs for everything. no replacement needles or anything, I think thats normal though that their not included. Im from chilliwack bc btw, been out to alberta a few times, I got family in calgary and edmonton. nice country out there. Chris Lee mrclee@telus.net



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