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 -> General 58-64 Full Size Forum -> Adjustment of Rockhester 1 barral with heat controlled choke
Post Info TOPIC: Adjustment of Rockhester 1 barral with heat controlled choke
TDS


Veteran Member

Status: Offline
Posts: 58
Date:
Adjustment of Rockhester 1 barral with heat controlled choke
Permalink  

I have rebuild my Rochester 1 barral carburator and in general its acting well.

But Im looking for some more power when acellerating from idle.

I need to rev it a few times to let it breath and get it running smootly and then I can roll of.

Idle is set to around 500 rpm

Mixture screw is set to higest idle after the timming was done. Sparkplugs are checked and the are burnt clean.

Timming is right on the ball at 500 rpm

Have replaced spark plugs, spark plug wires, dist. cap and rotor.

Idles perfect - has a minor poping in the exhaust at idle when engine is hot.

When enigine breakning downhill its has som backfiring trough the exhaust

This weekend I had a breakdown on the highway that was caused by a blocked fuelfilter.

Fuel was red from rust - Its been of the road for some years.

I will keep replacing filters until the fuel is clean.

Anyone know what I can do to get a smoother acceleration from idle?.



-- Edited by TDS on Thursday 6th of June 2013 05:43:38 AM

__________________
TDS


Veteran Member

Status: Offline
Posts: 58
Date:
Permalink  

Okay - I didnt remove the pipe from the vacuum advance on the dist before setting the timming.

I will try it out - thanks!

 

Should I plug both the vacuum advance can and the pipe to the manifold?. 

 



-- Edited by TDS on Thursday 6th of June 2013 12:54:52 PM

Attachments
__________________
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
pontiax


Poncho Master!

Status: Offline
Posts: 1465
Date:
Permalink  

Just the pipe to the manifold , it is the vacuum source for the distributor.

if you have a piece of  vacuum hose, connect it to the vacuum advance. With a vacuum pump check under the cap to see if the advance mechanism moves.



-- Edited by pontiax on Thursday 6th of June 2013 02:24:26 PM

__________________

pontiax- (canadian pontiac X frame)1964 Parisienne 2dr. Hardtop ,lagoon aqua metallic (Q) ,421 cid Dart Industries block and heads. 550 hp. 575 ft lb  of torque.

 
pontiax


Poncho Master!

Status: Offline
Posts: 1465
Date:
Permalink  

Check the vacuum advance on the distributor, it may be stuck. And remember to adjust timing with the vacuum hose removed from the distributor. Plug the hose with a golf tee or bolt. And reconnect after timing is set.



__________________

pontiax- (canadian pontiac X frame)1964 Parisienne 2dr. Hardtop ,lagoon aqua metallic (Q) ,421 cid Dart Industries block and heads. 550 hp. 575 ft lb  of torque.

 
TDS


Veteran Member

Status: Offline
Posts: 58
Date:
Permalink  

Okay - thanks

Before I set the timing the previous time I checked with the workshop manual.
It only describes this procedure for the 8 cylinder engine.

Do you know at which rpm the vacuum advance should kick in on the 6 cylinder?.

__________________
pontiax


Poncho Master!

Status: Offline
Posts: 1465
Date:
Permalink  

Adjust timing for 500 rpm idle, vacuum advance starts at 8" vacuum ,full advance at 15".



__________________

pontiax- (canadian pontiac X frame)1964 Parisienne 2dr. Hardtop ,lagoon aqua metallic (Q) ,421 cid Dart Industries block and heads. 550 hp. 575 ft lb  of torque.

 
TDS


Veteran Member

Status: Offline
Posts: 58
Date:
Permalink  

I checked the timing with and without vacuum - there wasnt any difference.
Vacuum advance is working - I can see the dist is turning when reving.

Its still accelerating rough from idle and without much power.
It has minor popping at idle (500 rpm)

I was wondering if it was the dist but the timing is very steady.

Any ideas?

Thanks..

__________________
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
carbuff2007


Addicted!

Status: Offline
Posts: 362
Date:
Permalink  

If your gas is as bad as you say, take the tank of and clean it and go from there


__________________
pontiax


Poncho Master!

Status: Offline
Posts: 1465
Date:
Permalink  

Distributors have mechanical and vacuum advance, if you saw no difference then maybe the vacuum advance is not working or it is connected to the wrong port or port is plugged on carburetor/manifold.



__________________

pontiax- (canadian pontiac X frame)1964 Parisienne 2dr. Hardtop ,lagoon aqua metallic (Q) ,421 cid Dart Industries block and heads. 550 hp. 575 ft lb  of torque.

 
TDS


Veteran Member

Status: Offline
Posts: 58
Date:
Permalink  

Okay.
I will take another look at the distributor/vacuum advance.
Is it both the mechanical advance and the vacuum advance that makes it turn?
I guess i will have to get me a vacuum tester...


__________________
pontiax


Poncho Master!

Status: Offline
Posts: 1465
Date:
Permalink  

Yes , most distributors use mechanical and vacuum advance together, mechanical advance is determined by rpm. Vacuum advance is determined by throttle position.



__________________

pontiax- (canadian pontiac X frame)1964 Parisienne 2dr. Hardtop ,lagoon aqua metallic (Q) ,421 cid Dart Industries block and heads. 550 hp. 575 ft lb  of torque.

 
TDS


Veteran Member

Status: Offline
Posts: 58
Date:
Permalink  

I believe I found the problem - a trip tomorrow will prove it.
There were 2 issues.

A small hair - properly from a brush - gave an uneven advance and next, pretty stupid, I had set the points gap way to small.
Gap was down on 0.007" = 0.25 mm.
I used the option to replace the condenser and points and start from scratch.
Timing is right on the ball at 500 rpm without vacuum advance.
Gap is set a little above 0.016" = 0.40 mm.
Max rpm on the mixture screw.

Thanks for your help


__________________
Page 1 of 1  sorted by
Quick Reply

Please log in to post quick replies.
Canadian Poncho Homepage -> Canadian Poncho -> General 58-64 Full Size Forum -> Adjustment of Rockhester 1 barral with heat controlled choke
Tweet this page Post to Digg Post to Del.icio.us
.
Support Canadian Poncho!
Select Amount:
<
.
.
.