Feeling Stupid extension
Posted: Mon Jun 14, 2021 5:51 pm
Well, Mr. Jelf - are you going to let us in on what conclusion you might have come to ??? Over 40 responses surely warrants the question ?
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Re: Feeling Stupid extension
Posted: Mon Jun 14, 2021 5:57 pm
Yes, I just posted a new report on today's activity.
Re: Feeling Stupid extension
Posted: Tue Jun 15, 2021 11:44 am
I believe I would edit your title to "Feeling Frustrated" - you are obviously not stupid !!!
I suspect your compression tester might not be up to the task at hand - did you by chance, after your "valve job", give each valve a little 'love tap" with a small brass hammer to seat it then check the contact area with Prussian Blue or equivalent ? I think you're having a "suck" issue & not bringing gas into the cylinders.
I suspect your compression tester might not be up to the task at hand - did you by chance, after your "valve job", give each valve a little 'love tap" with a small brass hammer to seat it then check the contact area with Prussian Blue or equivalent ? I think you're having a "suck" issue & not bringing gas into the cylinders.
Re: Feeling Stupid extension
Posted: Tue Jun 15, 2021 11:58 am
I'm with you on the tester. I don't trust it.
I didn't install the valves and seats, so I don't know if Mike used a hammer and Prussian blue. But he's rebuilt hundreds of Model T engines, so I think the valves are probably OK.
OK, I confess that I'm not really stupid. But being stumped like this sure makes me feel that way.
I didn't install the valves and seats, so I don't know if Mike used a hammer and Prussian blue. But he's rebuilt hundreds of Model T engines, so I think the valves are probably OK.
OK, I confess that I'm not really stupid. But being stumped like this sure makes me feel that way.
Re: Feeling Stupid extension
Posted: Tue Jun 15, 2021 12:13 pm
I know Mike quite well - he's done a couple short blocks for me over the years. Is this a "rebuild" or just a "freshened up" job ?
Re: Feeling Stupid extension
Posted: Tue Jun 15, 2021 1:12 pm
It was just valves, seats, and rings. The refresh/second rebuild was three years ago after the infamous failed rod and damaged crankshaft.
Re: Feeling Stupid extension
Posted: Tue Jun 15, 2021 1:25 pm
Valves, seats and rings. Done on a previously running engine, by a guy well known for quality work.
Put on new intake manifold gaskets, shoot some 30 or 40 wt oil into the combustion chamber, replace the plugs and immediately pull the car with another auto. You have low compression which is not pulling in fuel.
I refreshed a non-starter car as my last project and it was a pistol to get to start for the first time. Cylinders were slightly oversized and slightly out of round...got over-sized rings custom filed to fit...Compression was in the mid-20's. Oil in the cylinders, followed by a shot of fuel directly into the cylinder via hypodermic needle which did a pretty respectable job of atomizing the fuel and I finally started getting some firing which after about 10 minutes of repeating the procedure got the car running. Compression is now excellent and car is an easy starter. Despite the cylinders being well less than perfect (including a gouged wall from a wrist-pin) it doesn't smoke or cause any plug fouling...it's just a happy car.
I would never expect good compression initially, with new rings in older honed cylinders. A rebuild is a rebuild and a refresh is a refresh; they are not the same and rarely act the same.
Put on new intake manifold gaskets, shoot some 30 or 40 wt oil into the combustion chamber, replace the plugs and immediately pull the car with another auto. You have low compression which is not pulling in fuel.
I refreshed a non-starter car as my last project and it was a pistol to get to start for the first time. Cylinders were slightly oversized and slightly out of round...got over-sized rings custom filed to fit...Compression was in the mid-20's. Oil in the cylinders, followed by a shot of fuel directly into the cylinder via hypodermic needle which did a pretty respectable job of atomizing the fuel and I finally started getting some firing which after about 10 minutes of repeating the procedure got the car running. Compression is now excellent and car is an easy starter. Despite the cylinders being well less than perfect (including a gouged wall from a wrist-pin) it doesn't smoke or cause any plug fouling...it's just a happy car.
I would never expect good compression initially, with new rings in older honed cylinders. A rebuild is a rebuild and a refresh is a refresh; they are not the same and rarely act the same.