Recent content by 65ShelbyClone

Mechanical injection is also used, AFAIK exclusively, on non-supercharged nitro engines at least in part because the fuel can be shut off if for some reason the engine starts dieseling. They also run magnetos for 1.) the extra ignition power and 2.) the ability to absolutely kill the ignition...

Fair enough, I must have misunderstood.

No you don't. You don't need to do anything for quantities under 44 gallons. Above that and you have to fill out some paperwork for Homeland Security. The other stuff, the main component used in that incident, is more heavily regulated. Nitromethane by itself is not easy to use for those...

It's really not. Atmospheric pressure is 14.7psia at sea level. Put 14.7psi of boost on top of that and power will effectively double minus losses from increased intake air temperature and parasitic loss from driving the supercharger. Figure about a 70% power increase for 15psi of boost...

The ad says compatible with oil and gasoline. Whether or not that's true is up for debate. I would be likewise concerned about its operating temperature. It's possible, but not all that likely IMO. One cycle's unburned charge in the header would have to be ignited by the next or there would...

A lot of old rototillers also had a 1/2 speed reverse rotation output shaft on the cam.

It'll really like the cold air.

I prefer DOT 5.1 beer. If you look at the old front-engine top fuel dragsters, most of them have a blower belt tensioner pushing outward so the belt doesn't bend backward. The ones that had a tensioner on top of the belt usually had very little backward bend. The Surfers milled and decked their...

I use that same Permatex for sealing the valve-to-tank threads on Coleman lanterns. The button is a real thing the tuner car community calls scramble boost. It's just momentary max boost override. Bonus boost™, as I imagine it, would be unexpected or unplanned akin to a turbo wastegate line...

We usually assume the intake stroke pulls in the engine's whole displacement for simplicity equating to 100% volumetric efficiency. In reality the VE of a mower engine is going to be quite a bit lower than that, maybe 70-75%. That may be where some "bonus" boost came from.

Right, so ½ of engine displacement per revolution which is 220cc.

A four-cycle engine has one intake stroke every two revolutions though.

Ignore my comment about blower rotation. I got mixed-up looking at the blower being upside-down and backwards. Original post edited. Carry on. I can't explain how he's getting 15psi with that combination of parts. Somewhere between the blower and the intake port ought to be fine.

Before you finalize brackets for the blower, you'll need to turn it over so the drain plug is facing down. It is currently oriented to blow air backward out of the carb. Ignore this, brain fade on my part. You have probably seen this already, but I hadn't until now. Yeah, that's way too much...

Generally yes that is what happens. All else being equal, a larger carb throat reduces velocity which is what the venturi effect relies on to make the low pressure that pulls fuel through the jets. The Keihin jet sizes you're talking about are absolutely enormous, even for E85.