Enjoy 5% OFF at VEVOR Canada! and Support Canadian Poncho at the Same Time!
Members Login
Username 
 
Password 
    Remember Me  
Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> QJet Gurus: How do I speed up the "off choke"?
Post Info TOPIC: QJet Gurus: How do I speed up the "off choke"?
cdnpont


Canadian Poncho Superstar!

Status: Offline
Posts: 10623
Date:
QJet Gurus: How do I speed up the "off choke"?
Permalink  

Gurus; How do I get my Qjet to come off the choke a little quicker in the cold?

On my 327 when I rebuilt it, I did the partial restriction of the heat riser passage at the intake gasket, and I used a gutted heat riser as well. Even when I see 180 on the gauge, she still stays on high idle when out on the road, until I imagine that the spring heats up enough to keep the choke valve fully open. It will come off with a throttle blip, but then comes back on again at moderate throttle and stays a little bit too long.

Just would like it to come off fully just a little quicker.

Any ideas of what to adjust?



__________________
 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
ARCADIAN


Poncho Master!

Status: Online
Posts: 2672
Date:
Permalink  

Hi Mark I talked to my friend Jim who is a retired old style GM performance mechanic and very knowledgeable, he says your problem lies with the heat riser. If it is gutted it isn't allowing enough heat to kick the choke off completely. Recommend replacing the heat riser with a new one available with Four Seasons brand My 50 cents worth (inflation).
ARCADIAN
Chris



-- Edited by ARCADIAN on Monday 11th of January 2021 12:31:44 PM

__________________
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
Nov 18 to Dec 2 Black Friday UP TO 50% OFF Plus Huge Coupons
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7788
Date:
QJet Gurus: How do I speed up the
Permalink  

I'd adjust the length of the rod from the choke thermostat on the intake to the carb. If it's like my Q-jets, lengthen the rod so it takes less heat to pull the choke off.

__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
poncho62


Poncho Master!

Status: Offline
Posts: 1067
Date:
Permalink  

It could also be the linkage. There is a little weight in there that helps drop it down that may be binding a bit.

__________________


Hanover, Ont

Ontario Rodders Forum
cdnpont


Canadian Poncho Superstar!

Status: Offline
Posts: 10623
Date:
RE: QJet Gurus: How do I speed up the "off choke"?
Permalink  

Thanks Guys, I'll have a look today. Probably start with the rod height and make sure the weight is free. I don't think I'll install a actual working heat riser, as the car will be mostly warmer weather driven. I suspect it's simply that the spring takes too long to heat as the issue.

Here's a neat 67 vintage Rochester division film on the basic function of a Qjet choke, highlighting the correct starting sequence. Doesn't describe adjustment, but is still pretty interesting. Shows a BB as well.



__________________
 67 Grande Parisienne 4 door HT. 69 Parisienne Convertible.
 
seventy2plus2


Canadian Poncho Superstar!

Status: Offline
Posts: 7788
Date:
QJet Gurus: How do I speed up the
Permalink  

On my 1970 quadrajets, the choke thermostat pushes the rod up as it heats up. I know the 70 2 bbl the choke thermostat pulled the rod down as it heated up.

__________________
70 2+2 convertible
70 2+2 hardtop
70 Parisienne hardtop

 

 
Page 1 of 1  sorted by
 
Quick Reply

Please log in to post quick replies.
Canadian Poncho Homepage -> Canadian Poncho -> 65-70 Full Size Power Train Tech Forum -> QJet Gurus: How do I speed up the "off choke"?
Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.