Supercharged 212cc Think Tank / Idea Board

[bob58o]

Plumbing might look something like this with the bypass valve...

 

[Nosandwich]

Where's all the HVAC people?
Where's Chancer?

He left when Poboy got banned.

 

[bob58o]

He left when Poboy got banned.

I know what he did. He stole the trophy and ran. Figured since Texas is big and beer crates are small, nobody would find him, or the trophy.

I can envision him plaquing it up right now.

"2017 DIYGK Build Off Winner: Chancer"

 

[Kartorbust]

I know what he did. He stole the trophy and ran. Figured since Texas is big and beer crates are small, nobody would find him, or the trophy.

I can envision him plaquing it up right now.

"2017 DIYGK Build Off Winner: Chancer"

Need FHB back to make us a new one. When does voting start for the build off anyway?

 

[landuse]

Need FHB back to make us a new one. When does voting start for the build off anyway?

Very very soon

 

[bob58o]

Think a 1-2 psi fuel pump will work on a gravity carb without a return line???
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/332419885407
12V DC
1 AMP
1-2 psi
15 gallon per hour.

 

[bob58o]

Think a 1-2 psi fuel pump will work on a gravity carb without a return line???
https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.com/ulk/itm/332419885407
12V DC
1 AMP
1-2 psi
15 gallon per hour.

Anybody know where the third line on the above pump might go?
In,
Out,
and "air vent to fuel tank"?

 

[65ShelbyClone]

Looks like it's just a vent/drain for the electrical end of the pump. The Kawi parts diagrams don't show it connected to anything.

http://www.2wheelpros.com/oem-parts...b1-fuel-pump-assembly.html?partnum=49040-1055

Think a 1-2 psi fuel pump will work on a gravity carb without a return line???

I think it probably would. Many of the Kawasaki Mules are powered by a Kawasaki utility engine. A pulse pump or two would probably do the same job too and not need electrical.

 

[bob58o]

Looks like it's just a vent/drain for the electrical end of the pump. The Kawi parts diagrams don't show it connected to anything.

http://www.2wheelpros.com/oem-parts...b1-fuel-pump-assembly.html?partnum=49040-1055



I think it probably would. Many of the Kawasaki Mules are powered by a Kawasaki utility engine. A pulse pump or two would probably do the same job too and not need electrical.

I was concerned about running a pulse pump with a supercharger. Not sure how the pump might respond to the manifold pressure. I suppose driving a pulse pump from the block or valve cover would be ok, but not sure about a pulse from the intake manifold. Not sure the diaphragm was designed for 10 lbs of boost.

 

[65ShelbyClone]

A pulse pump would have to be driven by the crankcase pressure. With a blower it would only pump when not boosting.

 

[bob58o]

Don't want this tread to lock. It just might be some time before I get around to it.

With all the PAFRisms, why has nobody put a leaf-blower on one of these engines and made a video for me to watch?

 

[Kartorbust]

Don't want this tread to lock. It just might be some time before I get around to it.

With all the PAFRisms, why has nobody put a leaf-blower on one of these engines and made a video for me to watch?

The only leafblower supercharger I've seen, is someone used one or 3 (can't remember) and did it on a car.

 

[bob58o]

The only leafblower supercharger I've seen, is someone used one or 3 (can't remember) and did it on a car.

Roadkill Garage.
Think they did 4 or 5 IIRC.

http://www.roadkill.com/video/leaf-...a-1978-chevrolet-monza-spyder-roadkill-ep-16/

 

[bob58o]

If a Hemi Predator has its pitson sitting 0.025" below the deck and I swap the 55mm Predator crankshaft for a 54mm gx200 crankshaft, my piston would be another 0.020" in the hole. [55mm -54mm = 1mm; 1mm / 2 = 0.5mm; 0.5mm = 0.020"].
Starting at 0.025" in the hole, crank swap puts me at 0.045" in the hole.

But a gx200 crankshaft needs a gx200 connecting rod.
Predator standard length is 3.308. GX200 standard length is 3.303. ARC offers a gx200/clone connecting rod that is -0.020" (3.283"), which would be 0.025" shorter than the Predator Rod.
https://www.arcracing.com/6267-honda-gx200-3-283-x-1-183-x-709-billet-rod/
RC -.020" short length billet rod for the GX200 & GX160 or the BSP196cc(Clone). Machined from domestic 7075-T651 air craft grade aluminum.
3.283" center-to-center for a 1.180 rod journal and .709" wrist pin. Uses ARC's custom manufactured bearing inserts and ARP rod bolts manufactured specifically for ARC. ARC has the only forced oiling scoop dipper rods available for these engines providing superior lubrication at the bearing journal.
54mm crank with -0.025" Rod puts me around 0.070" in the hole.

The gx/clone uses the same 0.709" wrist pin that the predator does, so you can put a Honda crank in the Predator block if you use a Honda rod and a Predator piston.

So I would have a 70mm bore, 54mm stroke - Hello 208cc Engine.
With the piston sitting ~0.070" Below the Deck Surface.
With a 22cc Hemi Head...
And a 70mm Head Gasket (0.045" thick)...

7.25 :1 SCR.....

https://www.youtube.com/watch?v=bAomKp9hfs4

Clone Crank
http://www.nrracing.com/product-p/bsp-1275.htm

Honda Crank
http://www.nrracing.com/product-p/13310-zl0-602.htm

I would probably want a forged piston which would probably mean I would need a 0.490" wrist pin connecting rod. Haven't looked into the compression height of the forged pistons and connecting rod lengths available for them. I imagine I would need the piston cut, as opposed to the above drop in option with the stock hemi piston.

Smaller SCR means I can run more boost!
How do we feel about running 20% Nitromethane RC fuel through a roots blower with an effective compression ratio 15:1?

 

[65ShelbyClone]

How do we feel about running 20% Nitromethane RC fuel through a roots blower with an effective compression ratio 15:1?

I feel like the 10% oil content will be pretty gross. Better off to get 4gal of methanol and one gallon of nitro. Price per gallon will come out about the same and the exhaust won't be drooling black slime.

E85 is another easier, but less exciting and vastly cheaper option.

 

[bob58o]

I feel like the 10% oil content will be pretty gross. Better off to get 4gal of methanol and one gallon of nitro. Price per gallon will come out about the same and the exhaust won't be drooling black slime.

E85 is another easier, but less exciting and vastly cheaper option.

Since it is a draw through blower and I won't have an intercooler I like the idea of using the methanol to cool the intake charge and blower. Just not sure how the blower will hold up to gasoline or methanol being pumped through it. I think these vanes have a special coating or something. I don't think chemicals are good for those coatings.

 

[65ShelbyClone]

If the Chinese blower is actually a complete copy of the Japanese blower it imitates, then the rotors probably have some kind of Teflon coating that won't even notice the fuel. My genuine 500cc unit's rotors have some kind of gray coating. Doesn't mean it will stay on the rotors, but the coatings usually fail eventually even in totally dry EFI applications. My biggest concern would be fuel getting into the bearings and lube oil(which is something like $5 per ounce). That leads to shaft seals...

The VW bug crowd seems to like using them for draw-through setups that don't seem to have problems. After looking online, it appears that most blowers just have regular shaft seals on the rotor ends, even the ones designed for draw-through.

 

[bob58o]

It says to fill with 75W-90 GL-5

The gear oil was released for air shipping,so before installing, you must fill the gear oil about 100ml. The type is 75w-90,GL-5.
Which is about $1 per oz online. 100 ml is about 3.4 oz.

1 qt should fill it up 9 times.

https://www.ebay.com/itm/1-Quart-Ge...976413211?epid=1122192026&hash=item5d5c0e821b

My favorite part about using a honda crankshaft means I can use a PVL flywheel and ignition system. The honda/clone PVL flywheels are much cheaper than the Hemi ones. Like 100 bucks cheaper.

http://www.nrracing.com/product-p/6600-ph.htm

EDIT
Well I'm an idiot. That cheap PLV flywheel uses the standard ignition coil, not the Briggs Digital Ignition system.

 

[65ShelbyClone]

The liquid gold I was talking about is GM/Delco blower oil.

I thought the gear oil thing on the supplier's listing was just a "lost in translation" thing, but it seems that there are a LOT of opinions on which blower oil to use and some of them include hypoid gear oil.

Some blown alcohol drag racers say to use two-cycle oil because it will burn and not hydrolock the engine if a seal blows. At the same time, max-effort drag blowers don't have to last many hours between rebuilds.

Others say they use what goes in the engine.