Project: Briggs 3.5 (Don't eat while reading)

[Jerryburger]

Neat, oscaryu1! That's funny that you said the 3.5 is more rare than the 5.... All of my motors came from yard-sales and GoodWill... and they were almost ALWAYS the 60000 series B/S (6 cu in/ 2hp), with an occasional beat up 80000 (8cu in/3hp) sometimes. When I found my 1st 5hp (the one that's now serving as photo props!) I thought I had found The Holy Grail.... They're neat, but they're physically larger, and now that the HF Blue Terrors are out for so cheap, they kinda lost their luster. Leave 'em to the racers, I guess. Are you gonna put a slide carb on it? If so, I've got an idea for a manifold, but I'll have to take a picture or two- it's impossible to describe.
Okay- I'll shut up.

 

[oscaryu1]

Slide caburetor? Not sure yet. I'd love to see your idea.

I'm planning on a 5HP carburetor. I modified it with a... tool (AKA hammer) to make it fit.

 

[Jerryburger]

Dang it- now I have to get out the camera and *groan* take a picture and *sigh* post it..... JUST KIDDING! I'll try to get a picture and explanation posted tonight. Remember... this will be Assburger Technology.... nothing pretty.

 

[oscaryu1]

I can imagine your logo

 

[Jerryburger]

Kinda frightening what visions "Assburger Technology" conjures up- I'm thinking a hairy butt crack held together by duct-tape... but I'm sure that is the WRONG Image to insight! *shudder*
Around here, "Assburgered" means getting something done the cheap-wrong-ugly way.... It's what I do.
Either way,oscaryu, an apology is in order, because I wasted the last hours of daylight buzzing around the block on the TreeFrog, and NOT taking pictures of my stupid idea. Tomorrow- Yes! Tomorrow!

 

[oscaryu1]

Good thing I ah... went somewhere yesterday then haha!

That was my first image... then I saw "burger"...

 

[oscaryu1]

You can't imagine how much I had to hone to make that piston fit...


EDIT - Header = $9 from eBay, shipped.

 

[jr dragster T]

Uhh you shouldnt have had to hone that much to make the piston fit There's somthing wrong.

 

[oscaryu1]

Doesn't fit in the Briggs 5HP either. It was supposed to have some machine work done to it to make it fit, but I was cheap and did a 30 minute hone. Fits great.

Decided to use a Raptor III rod instead. Can hit 7,000 fine. Around how much a stock flywheel'll go.

 

[Russ2251]

Mr. jr dragster Tyler is correct. Should have had it bored (or machined piston?). Is pretty difficult to hold tolerances with a hone. Check ring end gap in several places in bore and check against specs. May end up having to get it bored out to next oversize unless it's beyond it already. Hones are used for little more than breaking glazed cylinder walls. Must have good cross-hatching for oil control.

 

[gocartkid]

I was wondering about that but decided to bite my tongue. I agree, do you have any buddies at automotive shops or something? If not you should start being really nice to the guys at the shop, they might just come in handy!

 

[oscaryu1]

I'm a kid remember?

We do our own oil changes, maintenance... (Well actually I do it...)

It might've been the little bits of crud on the wall or so, I'm not sure. The crosshatch pattern looks like mine, so no worries there...

 

[gocartkid]

C'mon, being a kid is no excuse. Everything is a learning process, and age doesn't mean a thing. I've been building custom v8 Chevy s10's with my dad since I was 8 in his shop. I'm 14 now. I now basicaly run a small engine shop out of my garage; I have people bring stuff that needs to be fixed in exchange for some cash or whatever. You seem like a bright kid to me. An old small engine mechanic and I were talking about this, and here is what he said: "NEVER stop learning. There is ALWAYS something new to grasp. We ALL make mistakes and screw things up, and that's because we'e human." Good advice to live on.

Back to your problem: Drop the piston/rod assembly in and bolt it to the crank. Wiggle the rod from side to side and do the same with the piston. How much does it move? I'm almost willing to bet that the cylinder (since it wasn't bored with the right equipment) isn't a perfect circle which will cause major issues. Go to your local automotive shops and ask if they do machine work, maybe you could work it off by sweeping and tidying up the shop (I do this for a friend, and trust me just about every shop owner is looking for a kid to do some cheap labor)

 

[oscaryu1]

Well it slips right through (no rings). It seems like a good circle to me... I can spin it around at different heights and there's the same amount of resistance everywhere. Honestly, it fits just like the stock piston did, with the same amount of clearance.

And that's also the issue... you see, we're the only family that lives in the US (no joke)... The rest of our family tree lives on the other side of the world...

Thus, I grew up in a small city, and now into a big city... where I still get no help... I worked on cars prior to this... for fun. I went quite far, but then turned to small engines. This hobby was learned through taking apart engines and putting them back together. No books, no face-to-face help... (Although that would've been useful )

I wish I could work it off I have a shyness problem...

 

[Jerryburger]

Hey, oscaryu1! Sorry this took a while, but here it is..... hardly worth the wait, I might add.
This comes from my frustration of not being able to adapt my favorite carb to my favorite engine, for whatever reasons.... so I was at HomeDepot and saw these parts and thought, if a person were to smooth the ends of these flanges enough to seal, you could drill one to fit the motor, the other to fit the carb, and join them by a length of pipe, also allowing you to tune runner length. This is for people that have weird carb configurations and don't have their own mill. It's cheap-dirty and I think it could work. I'm going to attempt it on my 6hp Tecumseh flathead and/or the 5hp B/S flathead. Here's a picture of the parts I bought....

See? I told you it wasn't going to be pretty!

 

[oscaryu1]

Beautiful...

 

[oscaryu1]

Project update: FAILURE

This is why:

F' "Mike Clements" and his major respect. If I ever find that , it won't be a tea party...

Moral: Don't EVER take advice from Mike Clements, and screw him and his engines... "I've built open 3HP's"... sure...

 

[gocartkid]

So it just looks to me that you will need a shorter rod or piston. What sizes do you have in there now?

 

[Kenny_McCormic]

Looks like he put 5hp parts in a 3h block on some (wrong) advice. thats some MAD pop up you have there.

 

[gocartkid]

Looks like he put 5hp parts in a 3h block on some (wrong) advice. thats some MAD pop up you have there.

Yea, I re-read the whole thread and edited my original statement.