oil consumption on new motor?

vw donvieira · Posted: Fri Aug 22, 2014 8:43 pm Post subject: oil consumption on new motor?

My 2017 has about 2500 miles on it and I am either:

1- still consuming oil on break in (Chrome rings)
OR
2-Something bad is happening?

-I haven't had a chance to check the plugs but I have no smoke from exhaust or wet exhaust at pipe.

-No external leaks

-Engine runs quite well and I run it hard (4000 rpm) on freeway.

-I commute once a week to Bay area (100miles) otherwise not much in-town driving

-Oil is Swepco 15-40 with 2 qt WIX ext filter. Oil temps up to 200-240 on long freeway runs in hot Central CA.
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Danwvw · Posted: Fri Aug 22, 2014 8:46 pm Post subject:

Just measure how much it is using over time. It should get better. It can take rings 100000 miles to be totally happy. How much oil is it using?
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Howard 111 · Posted: Fri Aug 22, 2014 9:56 pm Post subject:

Yes, the chrome rings do take a long time to seat. Plus normal oil consumption on an ACVW is right high in stock form. If it runs okay, and doesn't smoke, check your oil daily, and drive it.
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vw donvieira · Posted: Fri Aug 22, 2014 10:18 pm Post subject:

-i used 1 qt in 100 miles of HARD fwy driving (3700-4000 rpms).
-Previous 100 miles no problem.
-It may very well be the chrome rings if the plugs are good.
-Wow I didn't realize up to 10k miles on chrome rings.
-I feel more optimistic now.
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Danwvw · Posted: Sat Aug 23, 2014 11:03 am Post subject:

A quart of oil in 100 miles is too much and it would smoke. Check your oil using the same method each time. Either hot or cold. And when they're cold. If they have been started and shut back down they read about a 1/4 quart low. (But at least your filter will be full!)

Also if the full flow filter is located above the level of the oil in the engine and it is on it's side or up side down it will sometimes drain back and sometimes not drain back especially when the engine is hot.

Do you have long oil lines and perhaps external cooling?
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SBD · Posted: Sat Aug 23, 2014 11:23 am Post subject:

[email protected] · Posted: Sat Aug 23, 2014 11:27 am Post subject:

Engines with thermostats break in MUCH faster than those that do not have them. Chrome rings can be a bear to break in.
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Danwvw · Posted: Sat Aug 23, 2014 12:34 pm Post subject:

Max Welton · Posted: Sat Aug 23, 2014 12:56 pm Post subject:

Do a leak-down test. That will tell you when the rings have seated.

Max
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SBD · Posted: Sat Aug 23, 2014 1:41 pm Post subject:

vw donvieira · Posted: Sun Aug 24, 2014 5:58 am Post subject:

-The chrome rings are just stubborn aren't they Shocked

-I don't have a thermostat because I run a DTM on the motor.

-Oil filter sits upright on the left hand side of the engine compartment.

-thks for all the input/help
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Dr OnHolliday · Posted: Sun Aug 24, 2014 9:25 am Post subject:

Installation instructions for chrome rings used to require massively coarser hone grits than used for conventional cast iron rings. I never felt comfortable with what appeared to be the destruction of the cylinder walls and probable oversizing of the cylinder diameter after the coarse surface finish wore off....or the wear of the pistons on the rough walls and the amount of detritus that would be floating around in the oil...
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HRVW · Posted: Sun Aug 24, 2014 10:52 am Post subject:

During my early ys of building VW engines the mkt had chrome rings of which I chose to use.

My late dad was a mechanic and taught me on the best procedure he used to break in the chrome rings on 6/8 cyls that I followed on the VW engines and I had good luck.

Will not specify how it was done as I hate disagreements or hassles from some that are not 100% experienced engine builders.

VWCOOL · Posted: Sun Aug 24, 2014 4:43 pm Post subject:

How much gas is being expelled from the crankcase breather? That is another 'easy' way of assessing if your rings are broken in: lots of gas/fumes means blow-by means rings not seated yet (or worn out!). A good engine will have not much more than a wisp of wind from the breather

BTW, 4000rpm on a freeway is actually not 'hard' driving from a mechanical perspective; at a constant speed there will be significant manifold/intake vacuum present that will tend to pull oil past the rings.
Full-throttle, up-hill, loaded is hard driving... and may in fact be what your engine needs Wink

vw donvieira · Posted: Mon Aug 25, 2014 1:31 am Post subject:

at a constant speed there will be significant manifold/intake vacuum present that will tend to pull oil past the rings.
Full-throttle, up-hill, loaded is hard driving... and may in fact be what your engine needs Wink

-I have the altamont pass I can use to put some heat on the bus along with the Sunol grade.

-I have the bus at VW Jim's (Lodi) and he is going to put it through the paces for a week and hopefully go to Bug-o-rama too with the green beast.

Thks, vwdon
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vw donvieira · Posted: Sun Aug 31, 2014 6:37 pm Post subject:

Checked plugs 1,2 & 4. Didn't want to deal with #3. What a PITA with dual carbs/etc.

-All plugs looked beautiful, burning exactly as they should (#3 unkown).

-So I must still be trying to break in the rings?
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Max Welton · Posted: Sun Aug 31, 2014 7:18 pm Post subject:

Again, do a leak-down test. That will tell you when the rings have seated.

Max
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vw donvieira · Posted: Sun Aug 31, 2014 9:32 pm Post subject:

Thks I will do a leak down next week when I get back from work.

I appreciate all the input.

vwdon
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mark tucker · Posted: Mon Sep 01, 2014 8:32 am Post subject:

oiling rings uppon instlation can cause this. as can valve guides, as can not enough crankase breathing, as can somebody chamfering the skirts of the pistons. I dont beleave in the chrome ring hype, if the cylinder is round and the ring fits and is round it should seal. I do fine hone on everything. no reason for the ring to eat at the cylinder any at all or the other way around.


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