5hp

[jjfranky]

whats the differences in size as in there physical size of engines: 5hp,6hp,8hp,9hp,...etc.

 

[Jerryburger]

Are you talking about the B/S flatties or the clones?

With the B/S flatties, the 2,3, 3.5hp are very close, if not the same. Thw next jump is the 5hp. after that, the 8hp, which is pretty big.

On the tecumseh flatties, it's 2.5 and 3hp, then the 4hp is very slightly larger. I think after that, it's the 6hp, which is noticeably larger. IDK after that with tecumsehs.

I think on the Honda OHV (Clones) they're very close up to 6.5hp, but after that, they're noticeably larger. Haven't seen the 9hp, but the 11 and 13 are pretty good size. This was at Harbor Freight.

Personally, my size classification is by PTO. The 3/4" and down are my favorites, the 7/8" and above cause you to rethink your clutch/drive options (usually more expensive!).

..are you thinking on jamming a large motor onto/into a new project?

 

[jjfranky]

its for that atv,http://www.diygokarts.com/vb/showthread.php?t=1931
it suggests 5hp i was thinking bigger but i dont want to mod very mutch

 

[Kenny_McCormic]

I would use at least a 8hp flathead for the ATV, or one of the larger clones.

 

[Jerryburger]

Probably the easiest way to go would be a B/S flatty with Torqaverter. The motor you might score for a decent price; the Torqaverter is usually $170.
Or you could go for a 6.5 clone and clutch, but your off-the-line power would suffer a bit. A clone and Torqaverter is kinda tough, because you have to grind away bits of your brand-new Torqaverter to get it to fit the clone in the "proper" direction.
That frame sure looks neat!

 

[Kenny_McCormic]

Probably the easiest way to go would be a B/S flatty with Torqaverter. The motor you might score for a decent price; the Torqaverter is usually $170.
Or you could go for a 6.5 clone and clutch, but your off-the-line power would suffer a bit. A clone and Torqaverter is kinda tough, because you have to grind away bits of your brand-new Torqaverter to get it to fit the clone in the "proper" direction.
That frame sure looks neat!

I was thinking more like 11 or 13 hp clone with a 40 series. probably outrun a lot of factory quads.

 

[oscaryu1]

Are you talking about the B/S flatties or the clones?

With the B/S flatties, the 2,3, 3.5hp are very close, if not the same. Thw next jump is the 5hp. after that, the 8hp, which is pretty big.

On the tecumseh flatties, it's 2.5 and 3hp, then the 4hp is very slightly larger. I think after that, it's the 6hp, which is noticeably larger. IDK after that with tecumsehs.

I think on the Honda OHV (Clones) they're very close up to 6.5hp, but after that, they're noticeably larger. Haven't seen the 9hp, but the 11 and 13 are pretty good size. This was at Harbor Freight.

Personally, my size classification is by PTO. The 3/4" and down are my favorites, the 7/8" and above cause you to rethink your clutch/drive options (usually more expensive!).

..are you thinking on jamming a large motor onto/into a new project?

Briggs 2HP and 3HP are quite different. Larger carburetor, 33% more displacement, ect. 3.5HP is NOTHING like them. Bore larger than a 5HP (tried 3.5 piston it 5HP).

4HP has a slightly longer rod than the 5HP... different head design (4HP head on 5HP will improve lower end torque, but kill high end, not worth it).

GX160's and GX200s... 163cc vs 196cc. 5.5HP crankshaft will fit in a 6.5HP, but not vice versa. Same piston, same rod, different crank stroke, carburetors are different, head, cam... And GX160 flywheel advances timing by 4 degrees if put on a GX200.

GX110/GX120, GX120 has larger bore, but same length rod. That's all I know haha...

GX340/GX390, parts are interchangeable... GX240/GX270, use GX390 cam and carburetor for more power...

The "16HP" Clones you see (Carrol Stream) are stroker GX390's.

 

[sayre315]

if you have the money then go for it
but first i would check out your craigslist and see if you can find a good sized honda, clone or flatty

 

[modelengineer]

I would be checking local auctions to find a damaged bike, since most ATV's (if not all) have bike engines.
If not into bike engines then what everyone else said. Something with a 3/4" shaft so as not to cause headaches with the drive system later on.

 

[Jerryburger]

Briggs 2HP and 3HP are quite different. Larger carburetor, 33% more displacement, ect. 3.5HP is NOTHING like them. Bore larger than a 5HP (tried 3.5 piston it 5HP).

4HP has a slightly longer rod than the 5HP... different head design (4HP head on 5HP will improve lower end torque, but kill high end, not worth it).

GX160's and GX200s... 163cc vs 196cc. 5.5HP crankshaft will fit in a 6.5HP, but not vice versa. Same piston, same rod, different crank stroke, carburetors are different, head, cam... And GX160 flywheel advances timing by 4 degrees if put on a GX200.

He might have been talking about physical package size. I was answering him as if the question was, "I have this space to put this engine into, what can fit?"

whats the differences in size as in there physical size of engines: 5hp,6hp,8hp,9hp,...etc.

I could be wrong, but that looks like what the question read as....

 

[sayre315]

yea every once in awhile i'll see a 250cc bike engine for around $100 with a tranny

 

[oscaryu1]

He might have been talking about physical package size. I was answering him as if the question was, "I have this space to put this engine into, what can fit?"

I could be wrong, but that looks like what the question read as....

I see 2-3-3.5HP blocks are basically the same size, just the 3HP and 3.5 has larger gas tanks. 4-5HP are generally the same. Then they step up more.

Thanks for clearin that up Jerry!

 

[Jerryburger]

Thanks for clearin that up Jerry!
__________________

No problem, sometimes someone will ask me "What's your favorite color?" and I'll answer "Trout" or something worse... It's not just my wife that has to keep me in check!....