Dashpot for V6

Anyone know where to find a dashpot for a V6 with Rochester 2G carb? Finding anything Jeep specific is always challenging, but seems like with the commonality of the 2G someone somewhere should have something that would work - something from a similar Buick V6 prior to selling to Kaiser?

thanks

 

When I first saw the dashpot at quadrajet I did not think it looked right - or at least it doesn't look like the broken one I have now. But with closer inspection and pics from various manuals - I think it might be right, and the on I have is not correct. Since the throttle return spring hooks to a bracket held in place by the dashpot stud - I am thinking that someone found one that fit the threads and broke off the plunger end just to hold the spring bracket.

I hope to call them on Monday and see if they can give a little more info, but it looks promising.

 

My carb dashpot has not functioned since I got the Jeep almost 2 years ago - its certainly not a necessity or even close to it. But...I am trying to help reduce some exhaust backfire and a kind of loud popping when letting off throttle quickly due to the temporary rich condition as Tim mentioned. I can usually manage it with just aware driving so I don't let off the gas too quickly, but since I do drive it the city a bunch, sometimes lights turn to red quickly or have to make jump from gas to brake. Additionally, I do hope it will also limit some of the fuel emissions out of the exhaust, although that is not as critical since I've tuned the ignition and mixture. (I have not had much problem with the engine stalling when letting off gas quickly unless its really cold and hasn't warmed up any - happened maybe 3 times this winter)

The jeep currently has headers to glass packs, which I don't like at all - too loud and noisy even in the best of times - but if this can help remove the backfire, then it will be a step in the right direction. Replacing with turbo mufflers will be next - just don't want to damage new mufflers with backfire issues.

FWIW - as I understand... for those who use their jeeps off-road a bunch, they remove or reduce the affect of the dashpot to help give more immediate and controlled throttle response when letting off gas. Right now, this is a trade-off I am willing to make although it can be frustrating off road - my tacoma seems to hold rpm high for too long when letting off gas and that can make it difficult to ease through a tough spot sometimes. But, the jeep dashpot is easily adjustable in a few seconds, so can always back it off if necessary off road - just add to the list of locking in, airing down and adjust dashpot

Finally, in addition to the Quadrajet site, CarPartsShed shows the dashpot as well, but cannot order online - must call. Will do that when I get a chance from work today and will post if and where the dashpot can be found.

 

thanks - leak around the header gasket or somewhere in the exhaust is very plausible. Don't know how to check that...all I have done is check and re-torque all the header mounting bolts and the connection form the header tubes to the glass packs. Anything else?

Next step will be to replace at least the glass packs with mufflers. At that point I can put in new header gaskets (if not new headers) as well (or maybe go back to original manifolds - would like to have rear exhaust instead of side-dumps).

With regard to the dashpot - Car Parts Shed ran out of stock and does not think it will have any more in the future. Quadrajet does have some, but they were not sure what vehicles/carbs it fit other than the vague description given on the webpage. The pic looks right compared to the drawing in the FSM and I believe the thread is right, so I ordered one and we'll see.

 

Just to make sure - I would be listening for a 'hissing' sound assuming I can hear anything over the engine noise? I assume this an obvious type sound that is easily heard? Just run the listening device along the header gasket and at the header to glass pack junction. Guess there could also be a pin hole in the header tubes.

 

thanks - I like this idea. hard to use soapy water on hot exhaust, but work well on cold. Could do it hot and just listen.

Tim- Ticking sound? would this only occur when running? I do have a valve tick on the right bank (cylinder 6 I believe) that may get confusing. Is there a explanation for why the leak would make a ticking sound - relate to only when each cylinder exhausts? In theory that would mean the exhaust tick would occur 3 times for each valve tick on the right bank (assuming its only cylinder 6 valve tick).

Thanks guys - getting pretty excited to get the exhaust done even though the muffler expense will be painful. Looking forward to a great summer of a well running (and quieter) jeep here in the mountains of Colo - assuming nothing unexpected breaks down. (save the body rust repair for next winter along with the spare fuel tank )

 

I get what you are saying, I wish it were that easy - most of the part stores couldn't get me any dashpot. The Rochester 2G carb was super common, but apparently most to the shops around here just chuckle when asking for any type carb parts. The few dashpots that could be found (for order) had very little info and they all mounted differently. Probably could get any of them to work with some tinkering for mounting, but trying to get the simple, straight replacement. Plus, the current mount is also necessary for attaching the throttle return spring. Its never just one little thing...

Anyway, the one I did order should arrive today and I will post how it works - mostly hoping to see if if fits the existing threads on the mount. The shape and mounting looks correct - at least should provide the least amount of tinkering to get the mount to work. Might have to cut the thread stud off the old one and attach to the new one.

thanks all

 

Update: the dashpot from Quadrajet seems to work fine. The threaded stud fits into the manifold threads fine (5/16 I believe), but had a little clearance issues with the bolt/nut that clamps some of the throttle linkage stuff together. Flipped that around and it clears. Still fine tuning how 'active' or engaged I want it to be - the FSM description is count 'one thousand one, one thousand two' or something like that. But so far, with just a little engagement, it seems to helping 'cushion' the throttle release and minimize some of the rich condition.

that being said - I pretty sure the exhaust is leaking somewhere on the right bank. Some of the valve 'tick' may actually be exhaust/header leak.

cheers all

 

PO ran both stock heater and a second heater under the passenger dash. Instead of running the hoses 'in-series' from radiator to stock heater to 2nd heater to engine, he ran the two heaters 'in parallel' and then into the engine. Think of it like an electric circuit with keeping the voltage same but splitting current - so lots of hose junctions. I have no idea why - not sure if its good or bad but doesn't seem to cause any problems. I'll probably simplify when I get that far - but for now its low on the priority list.