Feeling Stupid extension

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RajoRacer
Posts: 4305
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First Name: Steve
Last Name: Tomaso
* REQUIRED* Type and Year of Model Ts owned: 1914 Touring, 1919 Centerdoor, 1924 TT C-Cab Express, 1925 Racer
Location: Longbranch, WA
MTFCA Number: 14972
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Feeling Stupid extension

Post by RajoRacer » 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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Steve Jelf
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Re: Feeling Stupid extension

Post by Steve Jelf » Mon Jun 14, 2021 5:57 pm

Yes, I just posted a new report on today's activity.
The inevitable often happens.
1915 Runabout
1923 Touring

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Topic author
RajoRacer
Posts: 4305
Joined: Sun Jan 06, 2019 12:18 pm
First Name: Steve
Last Name: Tomaso
* REQUIRED* Type and Year of Model Ts owned: 1914 Touring, 1919 Centerdoor, 1924 TT C-Cab Express, 1925 Racer
Location: Longbranch, WA
MTFCA Number: 14972
MTFCI Number: 15411
Board Member Since: 2001

Re: Feeling Stupid extension

Post by RajoRacer » 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.

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Steve Jelf
Posts: 6463
Joined: Fri Jan 04, 2019 9:37 pm
First Name: Steve
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Re: Feeling Stupid extension

Post by Steve Jelf » 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.
:)
The inevitable often happens.
1915 Runabout
1923 Touring

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Topic author
RajoRacer
Posts: 4305
Joined: Sun Jan 06, 2019 12:18 pm
First Name: Steve
Last Name: Tomaso
* REQUIRED* Type and Year of Model Ts owned: 1914 Touring, 1919 Centerdoor, 1924 TT C-Cab Express, 1925 Racer
Location: Longbranch, WA
MTFCA Number: 14972
MTFCI Number: 15411
Board Member Since: 2001

Re: Feeling Stupid extension

Post by RajoRacer » 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 ?

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Steve Jelf
Posts: 6463
Joined: Fri Jan 04, 2019 9:37 pm
First Name: Steve
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* REQUIRED* Type and Year of Model Ts owned: 1923 touring and a few projects
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MTFCA Number: 16175
MTFCI Number: 14758
Board Member Since: 2007
Contact:

Re: Feeling Stupid extension

Post by Steve Jelf » 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.
The inevitable often happens.
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1923 Touring


Scott_Conger
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Re: Feeling Stupid extension

Post by Scott_Conger » 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.
Scott Conger

Tyranny under the guise of law is still Tyranny

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