Incorrect CIS components - Options?

[gssereik]

I am assembling my 83 SC 3.0 USA spec engine after top end rebuild, keeping it entirely stock. I just noticed that a couple of the CIS parts that have been running for at least the past 25 years on this engine are not the correct part numbers. The Warm Up Regulator is an “089” but should be “090”. And the Aux Air Regulator is a “209” but should be “218”.

Questions:

1) should I keep running either (or both) of these items as-is?

2) can either of these items be adjusted to function like the correct part?

3) should I track down the correct parts?

Help me consider my options, please.

Thanks,
George Sereikas (gssereik)

[boyt911sc]

Originally Posted by gssereik

I am assembling my 83 SC 3.0 USA spec engine after top end rebuild, keeping it entirely stock. I just noticed that a couple of the CIS parts that have been running for at least the past 25 years on this engine are not the correct part numbers. The Warm Up Regulator is an “089” but should be “090”. And the Aux Air Regulator is a “209” but should be “218”.

Questions:

1) should I keep running either (or both) of these items as-is?

2) can either of these items be adjusted to function like the correct part?

3) should I track down the correct parts?

Help me consider my options, please.

Thanks,
George Sereikas (gssereik)

George,

Could you post a picture of your WUR-089? If the WUR is indeed a -089, you got the wrong part. Your motor needs a non-vacuum assisted WUR. WUR-089 is vacuum assisted. Your fuel enrichment would be deficient by using the wrong WUR.

The AAR is not that critical. The difference between AAR-209 and AAR-218 is the resistance of the heating element.

Tony

[3rd_gear_Ted]

Consider replacing the N.L.A. fuel pressure regulator.

The internal rubber diaphragm is the concern.

Failure mode is an exploding plenum upon start up.

[gssereik]

Here are pics. It was on the car when I got it. It has a small vacuum line at the base that was not connected anywhere. And there is what looks like a vacuum connection on top too. Wasn’t sure if one of these were vent line. But then after further research I discovered it was the wrong part number. My car should have an “090” I think. Thanks, George

[gssereik]

3rd gear Ted - Thank you for the advice about the fuel pressure regulator. I had not thought of that…. Will look into it. I’ll admit I have been focused to date on all the internal components of this 3.0 engine but now that the long block is done and I am reassembling I am finally looking over the CIS system and other external parts with greater scrutiny.

[boyt911sc]

Your ‘83 SC CIS US spec. should have a fuel distributor -077 and WUR -090. I could lend you a WUR-090 that you could try and test on your car without any obligation to purchase. Return it back to me if you don’t want to keep it. Think about it and decide.

I will be away from home for the whole month of November 2021. Or wait in December after my return from vacation.

Tony

[gssereik]

Thanks Tony!! My fuel Distributor is an -077. I am sending you a PM with a few questions about the WUR-090. I probably will take you up on your offer for loaner. But don’t send it now as the engine is not back in the car yet and I won’t need it until December anyway.

[3rd_gear_Ted]

Originally Posted by gssereik

3rd gear Ted - Thank you for the advice about the fuel pressure regulator. I had not thought of that…. Will look into it. I’ll admit I have been focused to date on all the internal components of this 3.0 engine but now that the long block is done and I am reassembling I am finally looking over the CIS system and other external parts with greater scrutiny.

Twist each fuel line connected to the engine & regulator to see if the swage fittings are good.

[boyt911sc]

Originally Posted by 3rd_gear_Ted

Consider replacing the N.L.A. fuel pressure regulator.

The internal rubber diaphragm is the concern.

Failure mode is an exploding plenum upon start up.

Ted,

Could you elaborate about your above post? You might know something we don’t know. There is no rubber diaphragm in all the WUR’s used in 911 CIS as far I know and the exploding plenum upon start up is not known until today. If you could share your experiences with these subjects is highly appreciated. Thanks.

Tony

[3rd_gear_Ted]

My scenario was with a 964 type regulator on a 3.6.
Sorry for confusion if functionality is different.
Suck on center fitting of fuel regulator and taste gas, diaphragm No good I was told by my wrench. I tasted gas. Purchased aftermarket adjustable fuel regulator. Problem resolved

[boyt911sc]

Originally Posted by 3rd_gear_Ted

My scenario was with a 964 type regulator on a 3.6.
Sorry for confusion if functionality is different.
Suck on center fitting of fuel regulator and taste gas, diaphragm No good I was told by my wrench. I tasted gas. Purchased aftermarket adjustable fuel regulator. Problem resolved

Ted,

Your information is irrelevant to the topic. We are discussing CIS component particularly a WUR (warm-up regulator). You are not helping by plugging impertinent information if you are even aware of it.

Tony