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Message started by plsully3 on 04/16/16 at 13:01:00

Title: Exhaust smoke video
Post by plsully3 on 04/16/16 at 13:01:00

The bike has 27k on it. Might have been run low on oil.
What do you make of this?

https://youtu.be/1fceV7tgKSk

Title: Re: Exhaust smoke video
Post by cheapnewb24 on 04/16/16 at 13:16:52

Looks suspicious to me, but I'm not one to make that kind of judgment. Wait for one of the pros to chime in. It doesn't look really bad, though.

Title: Re: Exhaust smoke video
Post by verslagen1 on 04/16/16 at 14:29:02

I'd say it needs a ring job.

Title: Re: Exhaust smoke video
Post by Kris01 on 04/16/16 at 15:01:54

Can't really tell from the video but that smoke looks blue. You're definitely burning oil. It could be your rings or valve guides. Time for a rebuild.

Title: Re: Exhaust smoke video
Post by cheapnewb24 on 04/16/16 at 17:35:39

Does it hurt to ride it like that?

Title: Re: Exhaust smoke video
Post by DesertRat on 04/16/16 at 17:48:17

a pcv valve that is totally plugged up with sludge can cause this ... check the vent tube at the top left of the head goes into the air filter box ...

or

it needs a rebuild ...

Title: Re: Exhaust smoke video
Post by DesertRat on 04/16/16 at 17:50:14

i love the interwebs -

Quote:

rings are one of the best parts of your engine to break, because your vehicle will generally still run but with blue smoke. Whereas if you had a knocking rod bearing, your engine would likely just explode at some random time on the freeway and leave you stranded. Ring issues will get worse over time, but they are less likely to lead to catastrophic engine failure. That said, the added friction from damaged rings can put stress on other engine components and shorten the engines overall life.

Title: Re: Exhaust smoke video
Post by cheapnewb24 on 04/16/16 at 18:04:47

173620362127013227530 wrote:

a pcv valve that is totally plugged up with sludge can cause this ... check the vent tube at the top left of the head goes into the air filter box ...

or

it needs a rebuild ...

Dad screwed up big time back in the 70's over his Mustang that had PCV valve trouble. Was "blowing oil out the dipstick." He changed the engine, injured his back, and got discouraged and sold it because it didn't perform like the old engine. Went from a 260 to a 289. It was a 1964.5 year model.

By the way, he hurt his back actually carrying that 289 V8 in his arms. :o

Sometimes it helps to know what's going on. :-?

Title: Re: Exhaust smoke video
Post by gizzo on 04/16/16 at 18:07:11

I'm starting to see a pattern here... ::)

Title: Re: Exhaust smoke video
Post by gizzo on 04/16/16 at 18:10:11

4E45484C5D43485A4F1F192D0 wrote:

Does it hurt to ride it like that?

I read that a different way the first time. I imagined the EPA kicking him in the butt every time the bike puffed smoke. In that case, yes, it would hurt to ride it like that. ;)

Title: Re: Exhaust smoke video
Post by DesertRat on 04/16/16 at 18:45:37

4B404D4958464D5F4A1A1C280 wrote:

...
By the way, he hurt his back actually carrying that 289 V8 in his arms. ..

460-650 lbs engine?

bwahahahahahaha ... ;D ;D ;D ;D ;D

Title: Re: Exhaust smoke video
Post by cheapnewb24 on 04/16/16 at 19:18:01

Well..... I just asked again and found that his Dad had one side of the engine.

Oh well... :-/ There went that story... :-/

Title: Re: Exhaust smoke video
Post by justin_o_guy2 on 04/16/16 at 19:24:09

All is not lost.
As Gizzo said
There seems to be a pattern.
I had a buddy who had a 260,, little car would hop.. man that was fun..

Title: Re: Exhaust smoke video
Post by cheapnewb24 on 04/16/16 at 19:42:10

I gather that 289 Hi-Po wouldn't burn rubber like that little 260 would, if at all.

Strange, ain't it?

Title: Re: Exhaust smoke video
Post by Kris01 on 04/17/16 at 20:42:21

A standard 289 is not a HiPo. Either 289 would spank a 260.

BTW, the 64-1/2 cars didn't have a PCV valve. They had a road draft tube. ;)

Title: Re: Exhaust smoke video
Post by smokin_blue on 04/18/16 at 10:05:34

I am with Verslagen My guess would be rings. Do a compression check.

Also have someone follow you down the road. See if it puts out more smoke when you accelerate or when you slam the throttle shut at higher revs. If you get a big puff of smoke out when you chop the throttle then look at the valve seals and guides.

Title: Re: Exhaust smoke video
Post by justin_o_guy2 on 04/18/16 at 10:08:52

Might not be a busted ring.
Might just be stuck.
Sure haven't seen much of either, or bad guides, but,
Stuffs gonna happen..

Title: Re: Exhaust smoke video
Post by Dave on 04/18/16 at 10:41:02

The piston/cylinder on these bikes is pretty durable.....unless you run the bike low on oil. There have been several members who have been on the interstate for an extended ride....and run the bike low on oil and scored the piston/cylinder in the process. It seems a bit odd - the cam bearings get damaged by too low of engine idle speed (but the piston/cylinder and cam/rockers survive), The cam/rocker gets damaged by oil with low ZDDP - but the cam bearings and piston/cylinder survive. The piston/cylinder gets damaged when the engine is run low on oil...especiallyky at speed (but the cam bearings and cam/rockers seem to hold up). I don't know of anyone that has documented a worn out valve seal issue.

What is your goal with this bike? If you want the smoke to stop.....it really is time to freshen up the top and and piston/cylinder, and put a new cam chain in while you have the bike torn down.

If the bike runs fine and you just need to add oil periodically.......is it worth $ 400 in parts to get the bike freshened up? (My guess is that you will need a used cylinder, Lancers new 94mm Wiseco when they are available, a cam chain, valve seals, and a gasket. If the cam/rockers are bad....you need to add another $ 400 to the estimate).

You may be able to find a good running used engine for less.

Title: Re: Exhaust smoke video
Post by justin_o_guy2 on 04/18/16 at 11:11:38

If you want to go to lengths, wring out some power, then you can go oversized on the piston, put a cam in, clean up the exhaust, get the bore treated, and spend some MUNeee...

There are several here who have massaged theirs. I don't know what differences between them there are and how much different they perform on the Dyno. Naturally, the most cost effective performance gains are from ditching pounds.

Like Dave said, never seen a guide give up like that. And, it Is strange how a
Low oil event
gets the piston and not the cam.
Just going on the odds, what's been seen, Dave is right. The stuck ring is a real long shot.
Not knowing the history of your bike, it's possible that it sat up long enough for the oil on the rings, cylinder , piston to drip down and leave it insufficiently protected, then starting it up hurt it.
Wouldn't it be cool to have a scope and be able to go through the plug hole and look at the bore wall?

Title: Re: Exhaust smoke video
Post by Dave on 04/18/16 at 11:34:48

A lower cost rebuild is possible, if you can find some good used parts. Obviously the piston rings and a cylinder hone would be the minimum.....I have a stock piston with 17,000 miles you can have (I used the cylinder for an overbore).

Title: Re: Exhaust smoke video
Post by justin_o_guy2 on 04/18/16 at 16:48:28

http://corvaircenter.com/phorum/read.php?1,348050,348191

Might be worth a try, before tearing it down.
I would not do this without asking the genuine mechanics here first. I'm still leaning toward Dave being right, but Boy wouldn't it stink to get in and find a stuck ring?

Title: Re: Exhaust smoke video
Post by cheapnewb24 on 04/18/16 at 20:18:53

Would thicker oil help? :-?

Title: Re: Exhaust smoke video
Post by Kris01 on 04/18/16 at 20:24:26

In my experience, only if it's 90W oil.

Title: Re: Exhaust smoke video
Post by plsully3 on 04/19/16 at 06:23:50

Thanks for the input! I'll check the vent tube and my neighbor used to rebuild auto engines so this is looking like a good learning experience. Should I go ahead and put in a new cam chain in addition to the valve seals and rings.

Title: Re: Exhaust smoke video
Post by plsully3 on 04/19/16 at 06:27:56

got the answer on the cam chain ... just missed it somehow when I was reading over the posts. I may try to ride it through the season carrying oil in my saddlebag. I know you can't get an accurate idea of the oil level when it's hot but I have a level which I put on my luggage rack just to make sure I've got the bike exactly vertical when checking the oil level.

Title: Re: Exhaust smoke video
Post by Dave on 04/19/16 at 07:02:24

You don't absolutely have to have it perfectly level, and hot is OK.....just pull it upright and make sure the oil is in the window.

Some folks also check the oil with the bike on the sidestand....by just having the top of the oil barely visible when on the stand. (I can't do that as I have a Cafe' bike with longer shocks and the bike leans at a pretty steep angle).