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Where does this go???


Cruzn620

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I don't agree with Shady's advice on that. The timing advance gives you better cold starts and a lot more torque under any partial throttle acceleration or cruising. Especially with a 4-cyl you are going to want that. You should hook it up to the carb. Whatever your carb's port is plugged into right now is not right or there needs to be a T for both things to be plugged into it. I always plug those in on all the L-series engines I ran. It helped a lot.

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I don't agree with Shady's advice on that. The timing advance gives you better cold starts and a lot more torque under any partial throttle acceleration or cruising. Especially with a 4-cyl you are going to want that. You should hook it up to the carb. Whatever your carb's port is plugged into right now is not right or there needs to be a T for both things to be plugged into it. I always plug those in on all the L-series engines I ran. It helped a lot.

 

 

Absolutely right to all above. If you look at your picture you can see a thermal switching valve in the thermostat housing without a hose on it. This is probably for the Feed to the PBPT valve which drives the EGR valve. Somehow some of your hoses may be hooked up wrong.

 

When I get home I'll check my hose diagrams for you but for now the rear valve cover side port on the carb should go to the thermal switch on the thermostat housing and from it to the BPT valve. The front port on the carb should go to the vacuum advance.

 

mike

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oh ok guys, thanks again for the input. there are two black hoses that were bundled in with my fuel line, and were perfect length to hook to the two tubes on the base of my carb, so i put them on there. i agree with the thermo housing ports, never had a clue on what went there. if you can scan that hose diagram and post it that would be VERY MUCH appreciated!!! when i get my manifolds back on, i will take pictures of how i have everything routed. after you guys get done laughing at me, you can tell me where everything is SUPPOSED to go...hahaha. thanks!

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Hey, this ties into my main question... Have an unknown year matchbox distributor, and with the replacement of the carb to a Holley, there's two available vac ports on the carb:

A: manifold vacuum (ie. high vac no throttle)

B: "timed spark" (ie. no vac no throttle, but picks up vac at throttle opening and loses as throttle opens farther)

 

Which one would be best on the dist?

 

Klotz's answer sounds like B.

Thoughts?

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I agree with Klotz. You don't want any advance at an idle. Once you start to apply gas, the vacume comes in and starts to advance the dist. Once up to speed the vacume advance does nothing and the mechanical advance takes over.

 

Jester

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I agree with Klotz. You don't want any advance at an idle. Once you start to apply gas, the vacume comes in and starts to advance the dist. Once up to speed the vacume advance does nothing and the mechanical advance takes over.

 

Jester

 

Wow, I would have written two paragraphs to say that.

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