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W116 6.9 (6632) engine rebuild

Started by HPC, 23 January 2023, 04:39 PM

rumb


Yes the smog stuff will not find its way back into the engine bay...
[/quote]

As despicable and worthless as all that smog stuff is, you could completely kill yourself and future owners from ever being able to register or even sell the car.  CA CARB is spreading and many states just plain will never allow these cars on the road if they are missing components.

Even if your state can get by I would think heavily about removing it.  I recently sold 2 vehicles because they were missing smog components and I didnt want to get stuck with the thousands of dollars it would take to put back on them.
'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS

Rolo

I bought +1 pistons and rings from Mahle.  I ordered directly from Germany and they only have blueprints for +1 in Euro spec.  So you'll have to switch to premium gas on US spec motors.  The F1 shop made the pistons for me.

raueda1

Quote from: Rolo on 25 January 2023, 12:47 PMI bought +1 pistons and rings from Mahle.  I ordered directly from Germany and they only have blueprints for +1 in Euro spec.  So you'll have to switch to premium gas on US spec motors.  The F1 shop made the pistons for me.
FWIW, my +1 euro pistons were supposedly 8.6:1 compression not 8.8.  I learned this from some MB rebuild manual, can't recall which.   Regardless, I use premium.  However, I have used lesser gas a couple times and never had knocking problems and my timing is advanced significantly
Quote from: rumb on 24 January 2023, 01:46 PMYes the smog stuff will not find its way back into the engine bay...

As despicable and worthless as all that smog stuff is, you could completely kill yourself and future owners from ever being able to register or even sell the car.  CA CARB is spreading and many states just plain will never allow these cars on the road if they are missing components.

Even if your state can get by I would think heavily about removing it.  I recently sold 2 vehicles because they were missing smog components and I didnt want to get stuck with the thousands of dollars it would take to put back on them.
[/quote]. Interesting point.  Does CA CARB mandate emissions testing regardless of age?  Some states just waive emissions testing altogether after a certain age.  That's the case in both Utah and Connecticut (states of relevance to ME) if 25 years old or over.  Not sure how common this is. 
-Dave
Now:  1976 6.9 Euro, 2015 GL550
Before that:  1966 230S, 1964 220SE coupe, 1977 Carrera 3.0

rumb

I have seen some state that CA CARB requires all cars after 1975 to get smog tested. I think 15 or so states copy CA currently.

But to what standard I dont know. CO has same as CA, but my 6.9 was tested at the 1977 tailpipe test standard. This was 4 years ago, so I hope nothing changed.


Since I have a unmolested euro I got a federal EPA exemption. My belief is that all unmolested euro 6.9's (as well as should all other euro w116) would be able to get this. Note the car must be in original config with no smog on it.

This would be rather good news at least for 6.9 as most are euros.


You can read the prior discussion on another forum where i mention the federal form:

https://www.benzworld.org/threads/grey-market-sec-smog.3112100/page-2


In the US it is rapidly getting to the point where people decide what state to live in based on which politicians are in control.

So the question is, do you want to be the person stuck with a car you cant sell or drive 10-20 years from now? The smog stuff is ugly but it really doesnt rob that much power. Its only going to get worse, not better with our old cars.

BTW smog pumps and EGR can all be rigged to be non funtional. Ive heard of ppl gutting the inside of air pumps so they look ok but do nothing. You could do same with EGR put on blanking plate and gutted EGR on top of it.

'68 250S
'77 6.9 Euro
'91 300SE,
'98 SL500
'14 CLS550,
'16 AMG GTS

Rolo

Quote from: raueda1 on 25 January 2023, 03:22 PM
Quote from: Rolo on 25 January 2023, 12:47 PMI bought +1 pistons and rings from Mahle.  I ordered directly from Germany and they only have blueprints for +1 in Euro spec.  So you'll have to switch to premium gas on US spec motors.  The F1 shop made the pistons for me.
FWIW, my +1 euro pistons were supposedly 8.6:1 compression not 8.8.  I learned this from some MB rebuild manual, can't recall which.   Regardless, I use premium.  However, I have used lesser gas a couple times and never had knocking problems and my timing is advanced significantly
Quote from: rumb on 24 January 2023, 01:46 PMMahle only offered me one choice for +1 pistons.  Not sure what the comp ratio is, but I've tried midgrade, and it knocks.  Engine is running great according to the analyzer.  It's very strong.

HPC

Quote from: rumb on 24 January 2023, 01:46 PMYes the smog stuff will not find its way back into the engine bay...

As despicable and worthless as all that smog stuff is, you could completely kill yourself and future owners from ever being able to register or even sell the car.  CA CARB is spreading and many states just plain will never allow these cars on the road if they are missing components.

Even if your state can get by I would think heavily about removing it.  I recently sold 2 vehicles because they were missing smog components and I didnt want to get stuck with the thousands of dollars it would take to put back on them.
[/quote]

That makes sense!  I did not think of selling in future.

Randys01

When we last left this post I enquired about the rocker pad wear where it rubs on the camshaft.....do you have a couple of examples you can post.? I'd be interested in the rockers from Cyl 1 and 5.