Rail rider
Inmate # 3192016
Damm the smoke system is awesome... Next lay out a few hundred caltrops the police would never catch you...
New Motor on the Invader
- Thread starter Mammoth
- Start date
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Mammoth
Member
The crankshaft is static balanced.
I put the proper weight in a bag with a piece of wire holding it, and then put a equal counter weight on the flywheel. There is less friction from a piece of wire than a connecting rod.
Now that the engine's balanced I noticed how out of balance the tires are. Will have to fix that.
One other thing I will have to fix is the ignition timing.
I was incorrect when I timed the engine at 30* it should be more like 26*.
I went the wrong way with it. Oh well live and learn on small engines and work your way up.
When ignition timing is too advanced the power really falls off. As soon as I adjust it back It should gain a few more horsepower.
I put the proper weight in a bag with a piece of wire holding it, and then put a equal counter weight on the flywheel. There is less friction from a piece of wire than a connecting rod.
Now that the engine's balanced I noticed how out of balance the tires are. Will have to fix that.
One other thing I will have to fix is the ignition timing.
I was incorrect when I timed the engine at 30* it should be more like 26*.
I went the wrong way with it. Oh well live and learn on small engines and work your way up.
When ignition timing is too advanced the power really falls off. As soon as I adjust it back It should gain a few more horsepower.
Last edited:
Mammoth
Member
Changed the timing back to 26*.
Noticed the crankshaft had some side to side play so I made a shim for it.
The kart is up and running now.
Did a test lap around the block with two cameras. One facing forward an one facing rearward, but only one captured any video. Camera angle needs to be adjusted.
The run ended when the keyway fell out of the axle sprocket.
Noticed the crankshaft had some side to side play so I made a shim for it.
The kart is up and running now.
Did a test lap around the block with two cameras. One facing forward an one facing rearward, but only one captured any video. Camera angle needs to be adjusted.
The run ended when the keyway fell out of the axle sprocket.
tinamcjittles
ello m8
That smoke system is flipp'n awesome!! What exactly is it though??
Also, kind of cool to be able to figure out exhaust dimensions. I've been having issues with #420 chain so it's crazy that yours isn't stretching on you with that torque monster strapped to it lolz
Also, kind of cool to be able to figure out exhaust dimensions. I've been having issues with #420 chain so it's crazy that yours isn't stretching on you with that torque monster strapped to it lolz
Mammoth
Member
Im watching the #35 chain and clutch closely. Don't really know if they can take it.
I keep getting mineral oil from old transformers at work. I would think its similar to Johnsons baby oil.
It works as good as I hoped and better than I expected. There is no way someone could ride behind you when in operation.
It doesn't really use much. After the last run only 1/3 was gone out of the bottle.
I keep getting mineral oil from old transformers at work. I would think its similar to Johnsons baby oil.
It works as good as I hoped and better than I expected. There is no way someone could ride behind you when in operation.
It doesn't really use much. After the last run only 1/3 was gone out of the bottle.
ezcome-ezgo
G'me sumthin to write on
Baby oil is mineral oil with fragrance. Because baby pu
tinamcjittles
ello m8
I have an entire bottle of mineral oil, so just pour it through the exhaust? hehehehe, the police have no chance now...
perhaps a small pump powered by the lighting coil could do the job..
perhaps a small pump powered by the lighting coil could do the job..
Mammoth
Member
Holy monumental task batman. How about now, are they fixed?
bob58o
SuckSqueezeBangBlow
That .356 cam is pretty serious.
SPECS
Engine: 390cc OHV Clone 13HP
Recommended Class: Modified / Open
Target (MAX) RPM: 7600-7800
Spring Pressure (In / Ex): 65 lbs Dual Spring
Valve Lash (In/Ex): .003"
Ignition Timining: Pump Gas Not Recommended
110 Octane 34 Deg BTDC
Methanol 38 Deg BTDC
Compression Ratio: 12.5 to 1 or Higher
PROFILE
Lift: .3555" .3555"
C/L: 108.0 ATDC 108.0 BTDC
DUR @ 50: 254.3 Deg 254.5 Deg
SPECS
Engine: 390cc OHV Clone 13HP
Recommended Class: Modified / Open
Target (MAX) RPM: 7600-7800
Spring Pressure (In / Ex): 65 lbs Dual Spring
Valve Lash (In/Ex): .003"
Ignition Timining: Pump Gas Not Recommended
110 Octane 34 Deg BTDC
Methanol 38 Deg BTDC
Compression Ratio: 12.5 to 1 or Higher
PROFILE
Lift: .3555" .3555"
C/L: 108.0 ATDC 108.0 BTDC
DUR @ 50: 254.3 Deg 254.5 Deg
Mammoth
Member
It says 34* on the timing for a 390cc. Looks like I will have to get this engine on a dyno to figure out what it likes.
bob58o
SuckSqueezeBangBlow
This just came up on my thread. Jody from ARC talks about timing. I think we decided that those timing suggestions are for racing engines that stay above 5k pretty much the entire race. So if you want to make power higher up in the RPM range, then maybe 34* is great on 110 Octane with 12.5:1 CR
Not sure if these cams are made for strictly racing, so not sure how they perform with less timing or with more stop and go.
How did it feel when you when back to 26* compared to where you had it?
BTW what is your compression ratio and what fuel are you using?
Not sure if these cams are made for strictly racing, so not sure how they perform with less timing or with more stop and go.
How did it feel when you when back to 26* compared to where you had it?
BTW what is your compression ratio and what fuel are you using?
Mammoth
Member
Should be around 13:1 compression, and its running on 100LL aviation fuel.
It's wicked powerful at 30 and at 26.
Really only drove it once at both settings, and I was still keeping it easy on the new parts so its hard to say.
Seems to run pretty well now. No sputters and very responsive.
It's wicked powerful at 30 and at 26.
Really only drove it once at both settings, and I was still keeping it easy on the new parts so its hard to say.
Seems to run pretty well now. No sputters and very responsive.
Hellion
Disc brakes are for cowards
A mischievous friend of mine rigged up a smoke screen generator for his old pos Ford Escort. He used a reservoir and a windshield washer pump to squirt oil into the exhaust manifold or somewhere further downstream and with a convenient button on the dash.
tinamcjittles
ello m8
A mischievous friend of mine rigged up a smoke screen generator for his old pos Ford Escort. He used a reservoir and a windshield washer pump to squirt oil into the exhaust manifold or somewhere further downstream and with a convenient button on the dash.
Now there's a good use for windshield washers.. I'll be home in a few hours and have to get that rigged up!
Mammoth, what speeds have you gotten it up to so far? Sounds wicked in the videos
Mammoth
Member
The compression release is manual, and there is a specific order to follow when using it.
With the CR closed slowly pull the pull start until it gets compression.
Next push the CR button in then continue puling until its most of the way through the compression stroke.
After that reset the pull start and give it a hard pull.
As soon as it fires the CR closes itself.
So far this method has been working great with no snap backs. I even run the stock plastic pull handle, and it doesn't break ropes anymore.
It was a nightmare to start before the installation of the CR.
Two hands on the handle, one foot on the kart to hold it down, pull with all you got and pray for no snap backs.
I still bare the scar on my hand from one of the times it ripped the aluminum handle through my fingers.
Its geared to 55 mph at 6500 rpm which is good for quick accelerations.
If it was geared higher Id be afraid the clutch would burn up.
With the CR closed slowly pull the pull start until it gets compression.
Next push the CR button in then continue puling until its most of the way through the compression stroke.
After that reset the pull start and give it a hard pull.
As soon as it fires the CR closes itself.
So far this method has been working great with no snap backs. I even run the stock plastic pull handle, and it doesn't break ropes anymore.
It was a nightmare to start before the installation of the CR.
Two hands on the handle, one foot on the kart to hold it down, pull with all you got and pray for no snap backs.
I still bare the scar on my hand from one of the times it ripped the aluminum handle through my fingers.
Its geared to 55 mph at 6500 rpm which is good for quick accelerations.
If it was geared higher Id be afraid the clutch would burn up.
Mammoth
Member
I was just talking to my friend Craig about the timing numbers. He mentioned that since we shaped the squish band it increases turbulence in the chamber which helps the burn rate and improves its resistance to detonation which means you can increase compression.
When this is done its beneficial to retard the timing to somewhere about where its set now.
One other thing it does is help it run cooler.
When this is done its beneficial to retard the timing to somewhere about where its set now.
One other thing it does is help it run cooler.
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