Anti-backfire valve & backfiring

[MariaAZ]

I am debating on whether or not to leave the anti-backfire valve on the manifold of my 260Z. The throttle linkage has accomodation for the valve. What do I do with this part of the linkage if I decide to remove the valve?

Also, does this valve really do what it is supposed to do? I am stripping off all the smog stuff, but if this valve actually reduces or eliminates backfire on decelleration, I don't mind keeping it.

Thanks in advance

[moyest]

Wish I had one of those, MariaAZ!

My car used to backfire very occasionally with its standard SU carbs and a 2.5" exhaust.

Now I'm running triple webers, it pops and burbles all over the place! Sounds good though. Until one of the carbs started to run too rich, then it was even backfiring (very loudly) immediately after flooring the accelerator! Yikes! Scares the natives.

If you have an anti-backfiring valve I'd keep it on, if it doesn't harm your performance. You want your engine to sound like it's running sweetly, not backfiring on 3 cylindes!

That's just my 2c

[beandip]

MariaAZ , dident you post in the past that you were to have to pass all the smogg tests ? If this is so you will most likely need to keep all the emissions equipment on the car and in working order .:classic:

[Bambikiller240]

Originally posted by beandip

MariaAZ , dident you post in the past that you were to have to pass all the smogg tests ? ...........

That was what I thought I remembered seeing posted. If the car has to pass emissions testing, I wouldn't be removing anything.

JMO (as usual)

Carl

[MariaAZ]

Actually I did indeed post that the Z will have to pass emissions. I've spoken to a few local Z sources who have said they were able to pass with the emissions stuff removed. I'll see what happens, as I'm getting a pair of rebuilt SUs on an early 240 intake manifold that has the smog stuff blocked off. If it can't be persuaded to pass, I'll still have the original intake manifold that still has all the smog "stuff" attached.

It amazed me that the inspectors at the emissions testing facility didn't even pop the hood open. They just made sure I had a gas cap.

[beandip]

Sure is different here in Oregon. The car is put on a dyno and run up to speed and over a program of up and down to measure the enissions from the exhaust as the rpm go up and down. Of cource if the car fails there is no cost and no license , untill all is taken care of. I ran by truck throu 4 times before I got it to pass.

[MariaAZ]

In AZ the car's age dictates the testing it goes through. Newer cars are subject to more rigorous testing. My Z only has to pass HC & CO at idle and load. She does great when on the dyno & tested, but just keeps failing the HC at idle.

[beandip]

Dont get the wrong idea as to what years are tested here in Oregon . After 25 years of age no further tests are done. What I was saying before was that if you were required to test , this is how it was done here in Or.

[MariaAZ]

I just got the good news from the mechanic who I took my 260Z to in order for him to get her to pass emissions. I have a pass test result and can now get tags for her! I'm so excited, I can hardly wait to pick her up tomorrow (the shop is a good 30 miles away, and hubby & I have to share a car so there's no way to get her today.) It will be interesting to see how different the ride is when someone who really knows what they're doing has a turn at balancing the SUs.

[dogma420]

yeah, beandip, i hear ya.

Luckily, i just send for my tags every 2 years with my 72....it wouldn't pass with the slightly blown head gasket! .