Naive question about blow-by

[Guest tagree01]

I just have a quick, probably naive question about engine blow-by: why doesn't the oil in the crankcase catch fire and consume the engine? Thanks, Tom

[Plymouthy Adams]

low temp and lack of ignition source

[Normspeed]

Tom, blow-by is a technical term for what my P24 will be doing to Don Coatney and Pete "Blueskies" the day of the BIG RACE.

Just kidding, they are way out of my league.

I think the crankcase fumes are not flammable enough or hot enough to ignite.

[Plymouthy Adams]

right you are..blow by refers to the amount of compressed air escapes to the low end of the block during compresson..the more worn the rings/cylinders or pistion condition the higher the blow amount will be...some folks like to take the oil fill cap off and critisize these old engines because of a bit of positive pressure in the crankcase..bare in mind at all times unless you have upgraded to a PCV sysltem..this positive pressure is there because the car is static..must be moving in forward direction to DRAFT the crankcase and aleviate these fumes that is normal in the operation of your engine.

[Guest tagree01]

Tom, blow-by is a technical term for what my P24 will be doing to Don Coatney and Pete "Blueskies" the day of the BIG RACE.

Just kidding, they are way out of my league.

I think the crankcase fumes are not flammable enough or hot enough to ignite.

Thanks guys. I thought the actual combustion mixture (fire and all) was escaping into the crankcase.

What is this race I keep hearing about? Can a D14 (is that what my car is?) race? I have a feeling my engine is in need of some work, and I might as well rebuild it to run.

[Plymouthy Adams]

believe your D14 may be a typo..what year and body style car do you have? Plymouth or Dodge..? checked your profile..nothing listed...

[Guest tagree01]

believe your D14 may be a typo..what year and body style car do you have? Plymouth or Dodge..? checked your profile..nothing listed...

The D14 is a guess. The car is a 1940 Dodge business coupe. The engine serial begins with D14 and I looked on the parent site and it said D14, D17 and D19 are 1940-1941 Dodge. However, I'm not sure if the engine is original or if the engine serial D14 matches with the body style. I'll try to work on the profile. Thanks, Tom

[Guest rockabillybassman]

Further to the comments about the crankcase breather, should the outlet/inlet pipe be facing forward, straight down, or rearwards?

[Guest tagree01]

Further to the comments about the crankcase breather, should the outlet/inlet pipe be facing forward, straight down, or rearwards?

I read rearwards is correct?

[Plymouthy Adams]

So you have a pre war Dodge..I have a D19 Business Coupe and an D19 Town Sedan..the coupe is being worked at the moment, the sedan is in the barn in storage. Is this the grill you have in your car?

[Guest tagree01]

So you have a pre war Dodge..I have a D19 Business Coupe and an D19 Town Sedan..the coupe is being worked at the moment, the sedan is in the barn in storage. Is this the grill you have in your car?

Love the cars just pre-war (1939-42). I have no Idea why. The grill looks just like that.

[Plymouthy Adams]

Now I remember you posting that picture full size...was amazed that it was 5 window not a three window like the D19 Bz Cp...what kind of package tray you have behind that seat...and does the spare mount in the passe4nger compartment or the trunk?

[Guest tagree01]

Now I remember you posting that picture full size...was amazed that it was 5 window not a three window like the D19 Bz Cp...what kind of package tray you have behind that seat...and does the spare mount in the passe4nger compartment or the trunk?

Is the package tray the top behind the seat? you could fit a small person up there, maybe 2 if they don't mind spooning. The picture doesn't do it justice. The rest of the car is all trunk. It comes right up to the back of the top of the seats. The spare is accessed through the passenger compartment.

[Plymouthy Adams]

Yes..that is the package tray..We share that much in common in our cars..the later D24 got the spare in the trunk..lost the storage compartment behind the passenger side. My trunk is 5' 61/2 inces from lip to rear of the compartment. Room for maybe 4-5 mother-in-laws (dependent on size and stackability) or Jimmy Hoffa and maybe a couple other henchmen...no wonder this car was so popular...lol The quarter glass makes it appear to be just a coupe in looks...this is mine the day I got it..Charlie of this forum was there to help load it up...

[Don Coatney]

I remember that picture differently....

[Plymouthy Adams]

and I remember that one..that's funny as hell...gotta love it...I call that pic of myself OLD WORLD TIM looks like I just arrived at Ellis Island or something...

[Guest tagree01]

Yes..that is the package tray..We share that much in common in our cars..the later D24 got the spare in the trunk..lost the storage compartment behind the passenger side. My trunk is 5' 61/2 inces from lip to rear of the compartment. Room for maybe 4-5 mother-in-laws (dependent on size and stackability) or Jimmy Hoffa and maybe a couple other henchmen...no wonder this car was so popular...lol The quarter glass makes it appear to be just a coupe in looks...this is mine the day I got it..Charlie of this forum was there to help load it up...

Think of how much moonshine you could haul back in the days just after prohibition. We still have dry counties here in Texas. I'm thinking of painting the car black, loading it with beer and and be a modern day runner. Could probably fit 6 kegs in the back (the Aggie 6-pack).

[Don Coatney]

Here in Tennessee us shiners have a secret handshake and everything:D

[Guest tagree01]

Here in Tennessee us shiners have a secret handshake and everything:D

Now thatz what I'm talkin about! The government should promote this kind of entrepreneurial spirit (or spirits). Small business is alive and well.

[Normspeed]

(Ahem) Like the unearthing of the entombed 57 Plymouth in Tulsa this year, the BIG RACE is the stuff of legends. At a time and date yet to be determined, Pete and Don will go head-to-head and wheel-to-wheel in a classic shootout to see which is faster and quicker, high tech 230 cubic inch overdrive equipped flathead or the massive torque monster that is the built Chrysler long block big inch flattie. The Blueskies machine is the epitome of precision building, with modern Holley dual carbs and other secret refinements and is rumored to have recently left a trail of bewildered highway patrolmen from Idaho to Bonneville. The Coatney Special is an exquisite merger of the new (T-5 tranny) and the vintage (the owner/driver). The Coatney machine and its driver are said to run on a highly refined form of corn alcohol fuel specially brewed at a secret location in the Tennessee hills. The entire Mopar world waits in hushed and eager silence for the opportunity to witness this epic contest.

Did I capture it guys?

Thanks guys. I thought the actual combustion mixture (fire and all) was escaping into the crankcase.

What is this race I keep hearing about? Can a D14 (is that what my car is?) race? I have a feeling my engine is in need of some work, and I might as well rebuild it to run.

[Plymouthy Adams]

lets just say we found the source of the corn...lol

[Guest tagree01]

Oh, that race. Yeah. . . I just want to be a spectator for that one.

BTW, what kind of performance is possible (reasonably) from a 230, assuming no crazy stuff like fuel injection or nitrous (only bolt on and simple machine shop stuff)?

(Ahem) Like the unearthing of the entombed 57 Plymouth in Tulsa this year, the BIG RACE is the stuff of legends. At a time and date yet to be determined, Pete and Don will go head-to-head and wheel-to-wheel in a classic shootout to see which is faster and quicker, high tech 230 cubic inch overdrive equipped flathead or the massive torque monster that is the built Chrysler long block big inch flattie. The Blueskies machine is the epitome of precision building, with modern Holley dual carbs and other secret refinements and is rumored to have recently left a trail of bewildered highway patrolmen from Idaho to Bonneville. The Coatney Special is an exquisite merger of the new (T-5 tranny) and the vintage (the owner/driver). The Coatney machine and its driver are said to run on a highly refined form of corn alcohol fuel specially brewed at a secret location in the Tennessee hills. The entire Mopar world waits in hushed and eager silence for the opportunity to witness this epic contest.

Did I capture it guys?

[Guest rockabillybassman]

Performance on a 230? Hmmm.

Stock = 117hp

Cam = 15hp

Headers = 8hp

Dual carbs = 10hp

High compression = 10hp

Total = 160hp

These figures are extremely approximate because there are too many variables. How much compression? What cam profile? Which carbs? Any port smoothing? Shape of combustion chamber? What sort of valve job? Equal length header tubes or split stocker? Etc, etc.

[Guest tagree01]

Perfect. I just wanted to get a general ballpark estimate. Thanks. Tom

Total = 160hp

These figures are extremely approximate because there are too many variables. How much compression? What cam profile? Which carbs? Any port smoothing? Shape of combustion chamber? What sort of valve job? Equal length header tubes or split stocker? Etc, etc.

[Reg Evans]

That was Beautiful Normspeed !!! My heart is still racing.[quote=Normspeed;17601](Ahem) Like the unearthing of the entombed 57 Plymouth in Tulsa this year, the BIG RACE is the stuff of legends. At a time and date yet to be determined, Pete and Don will go head-to-head and wheel-to-wheel in a classic shootout to see which is faster and quicker, high tech 230 cubic inch overdrive equipped flathead or the massive torque monster that is the built Chrysler long block big inch flattie. The Blueskies machine is the epitome of precision building, with modern Holley dual carbs and other secret refinements and is rumored to have recently left a trail of bewildered highway patrolmen from Idaho to Bonneville. The Coatney Special is an exquisite merger of the new (T-5 tranny) and the vintage (the owner/driver). The Coatney machine and its driver are said to run on a highly refined form of corn alcohol fuel specially brewed at a secret location in the Tennessee hills. The entire Mopar world waits in hushed and eager silence for the opportunity to witness this epic contest.

Did I capture it guys?