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Search: Posts Made By: krswen
Forum: Model A (1928-31) 06-25-2012, 11:55 AM
Replies: 38
Views: 19,365
Posted By krswen
Re: Why the insert fabric roof and not steel

I read somewhere that until the mid-thirties U.S. steel rolling mills could not roll sheet wide enough to span the top. Can't lay my hands on the source now though ....

krswen
Forum: Model A (1928-31) 08-22-2010, 08:47 AM
Replies: 40
Views: 14,226
Posted By krswen
Re: High Compression Head

Also, don't forget that compression doesn't start until the intake valve is closed, which is around 50 ABDC for the stock A. So the true compression ratio, as opposed to the "geometric" CR, is even...
Forum: Model A (1928-31) 08-22-2010, 08:29 AM
Replies: 40
Views: 14,226
Posted By krswen
Re: High Compression Head

Hi Terry .....

It turns out that when you compress a gas "adiabatically" (no heat loss), which is close to what happens during cranking, the pressure ratio is greater than the volume ratio. But...
Forum: Model A (1928-31) 08-21-2010, 02:28 PM
Replies: 40
Views: 14,226
Posted By krswen
Re: High Compression Head

OK .... some quantitative answers to your question about increasing compression ratio. I just finished tuning my Model A engine computer model. I was able to find valve lift tables in a back issue...
Forum: Model A (1928-31) 08-08-2010, 05:59 PM
Replies: 15
Views: 12,301
Posted By krswen
Re: Need For Manual Spark Advance ?

Hi Marc ....

This may sound strange coming from an engineer, but as slowly as things happen with a Model A (most of the time), and given the fact that you can adjust the spark lever without taking...
Forum: Model A (1928-31) 08-08-2010, 11:56 AM
Replies: 15
Views: 12,301
Posted By krswen
Re: Need For Manual Spark Advance ?

The use of automatic spark advance was a step forward, but still did not meet all the requirements for optimum combustion. A short review:

Combustion starts with a spark at the plug electrodes,...
Forum: Model A (1928-31) 08-07-2010, 06:49 PM
Replies: 3
Views: 1,408
Posted By krswen
some engine questions ...

Does anyone know the rod length (center-to-center), piston pin offset (if any) and whether the cylinders are offset from the crank?

Ken
Forum: Model A (1928-31) 08-06-2010, 05:21 PM
Replies: 35
Views: 6,396
Posted By krswen
Re: Thermostat data, not opinions

Hi PDXCougfan ...

I'm thinking of modeling it with GT Cool (part of GT ISE suite of programs), but first I want to get my GT Power engine model up & running. I'm sure I'll be pestering the folks...
Forum: Model A (1928-31) 08-05-2010, 09:19 AM
Replies: 35
Views: 6,396
Posted By krswen
Re: Thermostat data, not opinions

you're absolutley right ..... I fell into the same trap of loose technical language that I criticize my students for! There is no such force as suction. The flow is driven by atmospheric pressure...
Forum: Model A (1928-31) 08-04-2010, 12:07 PM
Replies: 10
Views: 2,292
Posted By krswen
This will be anathema to the purists ....

but has anyone ever made a fan shroud? Done right they can improve fan performance significantly.

Another interesting fact I ran across the other day in one of my aerodynamics textbooks (this...
Forum: Model A (1928-31) 08-04-2010, 11:25 AM
Replies: 5
Views: 1,925
Posted By krswen
Re: Carb Cough and fart

somewhere I read recently that the latest WD40 isn't flammable, so won't work for this test .....

Ken
Forum: Model A (1928-31) 08-04-2010, 07:38 AM
Replies: 35
Views: 6,396
Posted By krswen
Re: Thermostat data, not opinions

here's a link with a good description of how cooling systems work:http://www.arrowheadradiator.com/14_rules_for_improving_engine_cooling_system_capability_in_high-performance_automobiles.htm
Forum: Model A (1928-31) 08-03-2010, 06:02 PM
Replies: 35
Views: 6,396
Posted By krswen
Re: Thermostat data, not opinions

Hi Frank ....

Yes, the pump does suck somewhat on the circuit, but the radiator is on the far side of the engine. The pump has to suck water from the lower radiator tank through the restrictions...
Forum: Model A (1928-31) 08-03-2010, 03:29 PM
Replies: 35
Views: 6,396
Posted By krswen
Re: Thermostat data, not opinions

Hi Marc ...

Alas, I don't have my A yet. Awaiting retirement (soon I hope). Then I certainly will do some experiments!

Ken
Forum: Model A (1928-31) 08-03-2010, 03:15 PM
Replies: 35
Views: 6,396
Posted By krswen
Thermostat data, not opinions

I’ve been pondering the advisability of using a thermostat. Here’s why.

The Model A cooling system is very primitive compared to more modern cars. Today, when we design an engine, the water...
Forum: Model A (1928-31) 08-01-2010, 03:23 PM
Replies: 8
Views: 2,186
Posted By krswen
Question about parts books

In the early 60's I had a summer job as a partsman at the local Ford dealership. I learned a lot about how engines and cars are design by studying the exploded views in the parts books, which came...
Forum: Model A (1928-31) 07-30-2010, 11:27 AM
Replies: 7
Views: 2,343
Posted By krswen
Re: Any A Model kits made?

type "model a ford kit" into search window at ebay. Looks like ERTL, Lindberg, Revell and others have made kits over the years.
Forum: Model A (1928-31) 07-26-2010, 06:28 AM
Replies: 17
Views: 3,028
Posted By krswen
Re: Brumfield Swirl

You want the microturbulence in the mixture in the cylinder, not the port, although it is largely achieved through port geometry. The intake valve has already closed. The reason is as follows: once...
Forum: Model A (1928-31) 07-25-2010, 06:32 PM
Replies: 3
Views: 1,453
Posted By krswen
Re: Relative Humidity and Mixture Control.

At sea level and 15 degrees C (60 degrees F) fully saturated air only contains about 1.3% water vapor. At 85% humidity it would be 1.1%. The average Model A carb probably doesn't have the jets that...
Forum: Model A (1928-31) 07-25-2010, 05:45 PM
Replies: 17
Views: 3,028
Posted By krswen
Re: Brumfield Swirl

We started developing large-scale air motion in the cylinder called swirl and tumble in the late 80's. The way it works is that you shape the inlet port so that the incoming charge during intake...
Forum: Model A (1928-31) 07-25-2010, 07:22 AM
Replies: 3
Views: 1,453
Posted By krswen
Re: Relative Humidity and Mixture Control.

Actually, 85% relative humidity doesn't mean that the incoming air to the engine is 85% water vapor. It means that the air is holding 85% of what it is capable of holding at that temperature and...
Forum: Model A (1928-31) 07-24-2010, 10:23 AM
Replies: 5
Views: 1,860
Posted By krswen
Question about rumble seat coupes

Did all the rumble seat coupes have a roll-down back window, or was it special order?

Ken
Forum: Model A (1928-31) 07-09-2010, 05:53 PM
Replies: 18
Views: 4,082
Posted By krswen
Re: Introducing myself

Thanks for the quick response and kind words! What books would you recommend to increase my knowledge (the more technical the better)?
Ken
Forum: Model A (1928-31) 07-09-2010, 05:26 PM
Replies: 18
Views: 4,082
Posted By krswen
Introducing myself

Hi .. my name is Ken and I'm about to retire up in northern California. I'd like to get a Model A to piddle with. I'm a mechanical engineer with decades of experience restoring cars and...
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