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Old 11-16-2019, 11:17 PM   #1
Ronnies1953@yahoo.com
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Default Engine in my 1929 tudor sounds like it knocks

My engine sounds like it knocks around 40 to 45 when you level off on the throttle is this normal thanks
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Old 11-17-2019, 07:32 AM   #2
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Default Re: Engine in my 1929 tudor sounds like it knocks

Have you experimented with different spark lever settings? I know mine doesn't do that.
"Normal" is an obscure item with these individuals... Chap
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Old 11-17-2019, 03:24 PM   #3
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Default Re: Engine in my 1929 tudor sounds like it knocks

Hi Ronnie,
Mine does that as well. Travelling uphill, I can put my foot down and easily pick up speed to 60, no problem. During straight and level cruise and I lift my foot, ie having the inertia of the car pushing the engine, I also have this horrible knock.
With the oil pan off, I found that my crank can move forward about a 1/4 inch and that the trusts have all been knocked off and laying in the oil pan.
The guy who rebuilt my engine about 2000 miles ago, says that is normal, no need to worry.
I say BS. He did a crappy rebuild.
I might be wrong and would like to hear other comments.
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Old 11-17-2019, 03:39 PM   #4
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Default Re: Engine in my 1929 tudor sounds like it knocks

Quote:
Originally Posted by Floats View Post
Hi Ronnie,
Mine does that as well. Travelling uphill, I can put my foot down and easily pick up speed to 60, no problem. During straight and level cruise and I lift my foot, ie having the inertia of the car pushing the engine, I also have this horrible knock.
With the oil pan off, I found that my crank can move forward about a 1/4 inch and that the trusts have all been knocked off and laying in the oil pan.
The guy who rebuilt my engine about 2000 miles ago, says that is normal, no need to worry.
I say BS. He did a crappy rebuild.
I might be wrong and would like to hear other comments.

Yes, definitely BS
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Old 11-17-2019, 04:00 PM   #5
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Default Re: Engine in my 1929 tudor sounds like it knocks

TKS Ryan
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Old 11-17-2019, 05:14 PM   #6
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Default Re: Engine in my 1929 tudor sounds like it knocks

Not right for sure!

2000 miles on a rebuild.... obviously not done correctly!

While we were on the MFACA Canyonland tour in October we had to pull out of the tour on the third day due to a developing knock while under load. Now this rebuild is 23 years old with 45,000 miles!!! We found pieces of babbit in the oil so out it comes. So you see a properly rebuilt engine can go a long ways in a Model A !!
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Old 11-17-2019, 08:20 PM   #7
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Default Re: Engine in my 1929 tudor sounds like it knocks

Are you satisfied with 45,000 miles as the life of a model A engine? Not being a jerk as I have no idea what one should expect as the road conditions are very different for most A's now than when they were new.

Floats, sorry to hear your engine was built by someone who was either ignorant or a crook.

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Not right for sure!

2000 miles on a rebuild.... obviously not done correctly!

While we were on the MFACA Canyonland tour in October we had to pull out of the tour on the third day due to a developing knock while under load. Now this rebuild is 23 years old with 45,000 miles!!! We found pieces of babbit in the oil so out it comes. So you see a properly rebuilt engine can go a long ways in a Model A !!
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Old 11-17-2019, 09:01 PM   #8
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Default Re: Engine in my 1929 tudor sounds like it knocks

I think there is too many factors in roads, driving, and rebuilding to aay how long an engine will last.
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Old 11-18-2019, 11:25 PM   #9
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Default Re: Engine in my 1929 tudor sounds like it knocks

Floats, Berts sells a bronze "rear main seal" that has a strong thrust surface on it. It is in their new catalog. Engine has to be removed but it should work. Good Luck
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Old 11-19-2019, 01:00 AM   #10
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Default Re: Engine in my 1929 tudor sounds like it knocks

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Hi Ronnie,
. Travelling uphill, I can put my foot down and easily pick up speed to 60, no problem. .
Gee, what do you have in that motor, what Rear gears" 60MPH
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Old 12-20-2019, 01:58 PM   #11
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Default Re: Engine in my 1929 tudor sounds like it knocks

Thanks Dan,
I’ll follow up on the bronze rear main.

Russ,
I have a lower ratio in my Pickup and I have a Kilometre speedo, but you are correct 60 is a bit of a fib. Please accept my humble apologies.
However, the point remains that I have a bad knock when the energy and inertia of the car is driving the engine.
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Old 12-20-2019, 02:12 PM   #12
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Default Re: Engine in my 1929 tudor sounds like it knocks

Thinking back, my old engine did roughly the same thing. No idea how many miles were on it, old old rebuild. But it would knock when coasting, hard on the throttle it sounded and pulled great. Thrust bearing was very worn out, center main was missing large chunks and the rod bearings were all flaking apart. Hard to say what was actually making noise, probably everything


I hope the bronze thrust replacement works out for you. Have you contacted the rebuilder again?
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Old 12-20-2019, 08:54 PM   #13
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Default Re: Engine in my 1929 tudor sounds like it knocks

Sounds crazy but it could be the distributor. I had a similar problem; the knock/annoying noise eased when I let off the gas. Read in one of the books or forums that the distributor could be the problem; replaced the distributor and the knock/noise disappeared and has not reappeared in the 3000 miles since. Worth a look. Good luck
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Old 12-21-2019, 02:47 PM   #14
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Default Re: Engine in my 1929 tudor sounds like it knocks

Thanks Gents,
I am in the UK for a few months. I will certainly look into all the suggestions and report back once I return to South Africa.
Happy Christmas to all
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Old 12-21-2019, 05:31 PM   #15
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Default Re: Engine in my 1929 tudor sounds like it knocks

Quote:
Originally Posted by Floats View Post
Hi Ronnie,
Mine does that as well. Travelling uphill, I can put my foot down and easily pick up speed to 60, no problem. During straight and level cruise and I lift my foot, ie having the inertia of the car pushing the engine, I also have this horrible knock.
With the oil pan off, I found that my crank can move forward about a 1/4 inch and that the trusts have all been knocked off and laying in the oil pan.
The guy who rebuilt my engine about 2000 miles ago, says that is normal, no need to worry.
I say BS. He did a crappy rebuild.
I might be wrong and would like to hear other comments.
Get your money back for the babbitt job, and labor for taking it out, gaskets, all the parts to clean the block out. The only thing normal is he doesn't know how to babbitt, like a lot of other shops!!!!!!!!!!

Herm.

Last edited by Kohnke Rebabbitting; 12-21-2019 at 05:45 PM.
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Old 12-21-2019, 05:41 PM   #16
Kohnke Rebabbitting
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Default Re: Engine in my 1929 tudor sounds like it knocks

Quote:
Originally Posted by History View Post
Are you satisfied with 45,000 miles as the life of a model A engine? Not being a jerk as I have no idea what one should expect as the road conditions are very different for most A's now than when they were new.

Floats, sorry to hear your engine was built by someone who was either ignorant or a crook.
It should have been longer then that!

Herm.
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Old 12-21-2019, 06:33 PM   #17
Kohnke Rebabbitting
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Default Re: Engine in my 1929 tudor sounds like it knocks

One thing most Guys don't think about.

If a Model A runs mostly at 45 miles an hour, the crank will expand at least, .002.

If run mostly at 60 M.P. H., the crank will expand at least another .001 to .001-50.

A Model T with a 1 1/4, on mains and rods, as a norm will be running with .003 to .003-25 thousandths clearance.

It would be much less, as we know, with an oil pump.

So, the bottom line is, the engine running at 45, will have a greater oil clearance, then when running 60, in the same engine.

So a Babbitt job that hasn't been peened, or peened incorrectly, don't stand much of a chance, as the crank will peen it for you, and they do an awfully poor job of it.

Herm.
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