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Author Topic: 17.5 flathead  (Read 7625 times)

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Offline mowpoweranything

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17.5 flathead
« on: December 05, 2012, 12:14:38 pm »
Can anyone tell me if this engine is worth building or how good it is i found one for next to nothing should i get it or leave it also how good of a motor is it and for what. Give me the rundown on it.
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Offline The Tank

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Re: 17.5 flathead
« Reply #1 on: December 05, 2012, 12:18:23 pm »
With that horsepower rating it must be an opposed twin.
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Offline Honey Badger

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Re: 17.5 flathead
« Reply #2 on: December 05, 2012, 01:57:04 pm »
What is the model number stamped on the blower housing.  If the second to last number is a "7" in the model number (first set of numbers on the blower housing, reading left to right) then you have a pressure lube motor which is something to hang on to...
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Alex Stella
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It\'s not considered hoarding lawn tractors until more than one neighbor complains!

Offline mowpoweranything

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Re: 17.5 flathead
« Reply #3 on: December 05, 2012, 01:59:26 pm »
Single cylinder
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Offline BIG AL 202

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Re: 17.5 flathead
« Reply #4 on: December 05, 2012, 02:01:27 pm »
Are you sure thats not an OHV?
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Offline The Tank

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Re: 17.5 flathead
« Reply #5 on: December 05, 2012, 02:02:09 pm »
Are you sure the engine shroud hasn't been changed? I've never heard of a single cylinder fathead being rated that high.
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Frank "The Tank" Woods

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Offline mowpoweranything

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Re: 17.5 flathead
« Reply #6 on: December 05, 2012, 02:05:13 pm »
Positive
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Offline Honey Badger

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Re: 17.5 flathead
« Reply #7 on: December 05, 2012, 02:06:25 pm »
Bet is a 31 0HV blower housing on a flathead...  :lol:
What is the first 2 numbers in the "code" (last of the 3 sets of numbers reading left to right)
That will be the year of manufacture
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Alex Stella
CP Indian powered #53
98 MTD Box Chassis live axle 700
2011 rookie of the year MILMRA   2012 most improved driver MILMRA   2nd in points national CP
It\'s not considered hoarding lawn tractors until more than one neighbor complains!

Offline The Tank

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Re: 17.5 flathead
« Reply #8 on: December 05, 2012, 02:07:02 pm »
Quote from: Honey Badger on December 05, 2012, 02:06:25 pm
Bet is a 31 0HV blower housing on a flathead...  :lol:
That's what I'm thinking
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Frank "The Tank" Woods

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Offline Honey Badger

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Re: 17.5 flathead
« Reply #9 on: December 05, 2012, 02:09:16 pm »
Tank, when do you think the last year for 28 flatheads was for manufacturing?
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Alex Stella
CP Indian powered #53
98 MTD Box Chassis live axle 700
2011 rookie of the year MILMRA   2012 most improved driver MILMRA   2nd in points national CP
It\'s not considered hoarding lawn tractors until more than one neighbor complains!

Offline mowpoweranything

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Re: 17.5 flathead
« Reply #10 on: December 05, 2012, 02:10:22 pm »
Ive seen a few i used to work at a lawnmower  small engine shop just repairing motors but ive never hotroded the engines thats how come i keep asking motor?s what to look for that makes a good engine to do so with u know something special.
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Offline Honey Badger

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Re: 17.5 flathead
« Reply #11 on: December 05, 2012, 02:12:07 pm »
Quote from: mowpoweranything on December 05, 2012, 02:10:22 pm
Ive seen a few i used to work at a lawnmower  small engine shop just repairing motors but ive never hotroded the engines thats how come i keep asking motor?s what to look for that makes a good engine to do so with u know something special.
I guess it depends on what class you want to run in...  do you have one in mind specifically?   Some off hand engines I can think of are tecumseh ohv 15-17.5 enduro single cylinder.  They are pressure lube and stout engines.  Also the NON-AVS briggs 31 OHV, which is what sounds like your blower housing came off of.  Some of them have oil filters on them.  Start hoarding walbro LMT 56 carburetors....  They are found on flathead 28's and OHV 28 and 31 engines.  They are a two piece design, where the carb will unbolt from the intake manifold.  (unlike the flow jet, where the intake and carb body are cast as one).   Kohler singles, the 17 horse vertical shaft (or a similar horsepower rating)
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Alex Stella
CP Indian powered #53
98 MTD Box Chassis live axle 700
2011 rookie of the year MILMRA   2012 most improved driver MILMRA   2nd in points national CP
It\'s not considered hoarding lawn tractors until more than one neighbor complains!

Offline mowpoweranything

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Re: 17.5 flathead
« Reply #12 on: December 05, 2012, 02:12:49 pm »
When i get off work i will get that for you guys k
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I can weld anything but the crack of dawn but im working on it.

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Offline The Tank

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Re: 17.5 flathead
« Reply #13 on: December 05, 2012, 02:14:36 pm »
Quote from: Honey Badger on December 05, 2012, 02:09:16 pm
Tank, when do you think the last year for 28 flatheads was for manufacturing?

I think mid to late 90s, not 100% sure on that.

I've never seen a 31 cube flathead either. With that high of a rating I would assume it's a 31. The model type and code will tell what it is for sure.
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Frank "The Tank" Woods

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Offline royalblu68f100

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Re: 17.5 flathead
« Reply #14 on: December 05, 2012, 02:45:44 pm »
The highest hp rating for a single flathead I believe was 13 or 13.5hp.
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You never win a race by focusing on one aspect of the race!  Motor isn't everything, but you better have a good one!  Chassis too!  But remember, a driver can take a slow machine and make it faster!  I may not have/be the best of any of these but I'm trying!
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