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  #1  
Old 06-17-2008, 09:08 AM
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Default tec 6hp mods

we got a briggs 5hp mod thread. how about a tec 6hp?
i took some pics this morning

heres the headcover or w/e you call it. i took some 1000grit to it. im hoping the piston at TDC doesnt hit it


the head. most likely going to dremel the ridge between the valves and cylinder


my lightened version of the piston


my ghetto air filter



what other mods do you guys recommend?
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Old 06-17-2008, 11:38 AM
Kenny_McCormic Kenny_McCormic is offline
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Port clean up. Shave them eyebrows, the head gasket even left you some guidelines.
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Old 06-17-2008, 11:59 AM
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That's the same engine I'll be building soon. Someone's gotta have some ideas? Nice air fliter btw, and it actually could be function as a velocity stack.
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Old 06-17-2008, 12:15 PM
oscaryu1 oscaryu1 is offline
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3 angle valve job, heavier springs, billet aluminum flywheel, ARC rod...

Which none of this is compatible with that motor. Everything will have to be custom.
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Old 06-17-2008, 12:46 PM
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yeah. about the rod. where do i find one? i cant find a place that has performance parts for hh60.
ima gonna keep the old springs to help govern the engine a bit
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Old 06-17-2008, 01:06 PM
oscaryu1 oscaryu1 is offline
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Nowhere. Tecumseh's were not popular then, and still not popular now. You'd have to go to a machine shop and have them custom CNC a billet rod.
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Old 06-17-2008, 01:19 PM
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o joy. how about for a 8.5hp vertical shaft briggs?

about the eyebrows. along which line do you cut it?

Last edited by ed1380; 06-17-2008 at 03:37 PM.
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Old 06-17-2008, 03:35 PM
Kenny_McCormic Kenny_McCormic is offline
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Red I think, you dont want the rings to be exposed at TDC.
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Old 06-17-2008, 04:21 PM
oscaryu1 oscaryu1 is offline
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I'd just barely shave it down. Enough that the rings aren't exposed, but enough to increase flow.

Things you CAN do:

1. 3 angle valve seat job
2. Heavier springs
3. Custom CNC Billet Rod
4. Custom CNC Billet Flywheel
5. Mill head + Fireslot
6. Gapless Spark Plug
7. New Rings, hone cylinder?
  #10  
Old 06-17-2008, 04:35 PM
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i was looking to spend under $50 on it, but $30 just went on the rod.

the head looks like it already has been milled. im going to install a thinner head gasket, remove eyebrows and leave it at that.

then either make the 8hp briggs a horizontal shaft or get a lawn tractor tranny. maybe get a rod for it
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Old 06-17-2008, 08:20 PM
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8HP rod? I haven't seen one. Brigs 8HP L head billet flywheel? $200 on eBay.
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Old 06-17-2008, 09:11 PM
Kenny_McCormic Kenny_McCormic is offline
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I think you can push a vert shaft rod a little harder, it has no dipper to break off.
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Old 06-17-2008, 10:32 PM
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is that why stock rods cant rev high? i always though that it was cause they werent strong enough to handle the rapid motion of the piston
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Old 06-17-2008, 10:50 PM
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First off what are eyebrows, and second how the **** do you have a gapless spark plug...? Like a pulse plug?
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Old 06-18-2008, 09:32 AM
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It's both. Those Briggs dippers that are bolted onto the rods easily break off. The integrated dipper rods like the Raptor III rod don't break off as easily.

Eyebrows:



By "shaving the eyebrows", you gain flow. The downside is that compression is lowered a tiny bit, but this can be fixed with a bit of milling of the head.

Gapless spark plug:





Without a gap, you won't have to adjust the gap, and there's less of a chance of fouling the plugs.

You can find these plugs at WalMart. They are usually labeled "Marine Plugs" in the autmotive spark plug section. They're around $2 each.

However, the plug threads are a bit longer than standard small engine plugs, thus you'll need indexing washers:



Do NOT push a vertical shaft engine too high. Most of them use the blade as the counterweight, and have an aluminum flywheel. These flywheels were not crafted to go over 3,600, and split helluva easily. Much easier than cast iron, although cast iron isn't safe either. Removing the blade will result in the engine running erratically, shaking, or it will not start at all.
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Old 06-18-2008, 12:30 PM
Kenny_McCormic Kenny_McCormic is offline
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Quote:
Originally Posted by oscaryu1 View Post
Do NOT push a vertical shaft engine too high. Most of them use the blade as the counterweight, and have an aluminum flywheel. These flywheels were not crafted to go over 3,600, and split helluva easily. Much easier than cast iron, although cast iron isn't safe either. Removing the blade will result in the engine running erratically, shaking, or it will not start at all.
Only on a push mower engine, bigger 8+ horse engine are made to run without a load and use cast iron flywheels.
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Old 06-18-2008, 01:12 PM
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Quote:
Originally Posted by Kenny_McCormic View Post
Only on a push mower engine, bigger 8+ horse engine are made to run without a load and use cast iron flywheels.
^He's got it. I've never heard of a gapless plug before, and now I have questions. How or these any better than gapped plugs? Do they boost hp? How? Are there any adverse effects to the ignition system?
  #18  
Old 06-18-2008, 02:34 PM
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they're better at high rpm but ive heard they arent good for idling

i went to the local small engine repair place today and the guy said you cant mod a 8hp vert to horizontal. that sucks. even if i could mod it, good luck using a 1" pto

he wanted $50 for a tractor tranny. guess its time to reinstall solidworks and continue designing the kart.. still got to do the back suspension and the "interior" of the kart
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Old 06-18-2008, 08:31 PM
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o wow aint this awesome
i was doing some cleanup cause the folder was a mess and this popped up
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Old 06-18-2008, 09:10 PM
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heres what i have for the suspension
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