Speaking of H pistons.....

Absent Minded Farmer · Sep 20, 2019

Can you run kerosene on Firecraters or is my option flat top only? I have a set of Firecraters already & have a kerosene H that apparently needs one
of the two as there isn't a whole lot of compression. Can't quite spin the hand crank with a finger, but I don't feel the cylinders loading up either.

Thanks,
Mike

Janicholson · Sep 20, 2019

No. Kerosene (a very expensive fuel) needs about 6:1 compression to avoid destructive knock. A flat top piston in a kerosene head will make that target. If it is a show tractor and you intend to demonstrate the engine on Kerosene, flat top is about the only solution. Jim

Absent Minded Farmer · Sep 20, 2019

6:1 compression??! Might that be why I don't feel a whole lot of resistance when cranking? What should the cylinders read on a compression test? Might have to do that... & a leak down.

Mike

randy hall · Sep 20, 2019

compression ratio on a high compression gas head with flat pistons is only 5.9 to 1. with a distillate head is 4.7 to 1 and a kerosene head is less yet. Kerosine needs around 4 to 1 to work which gives you very low power and diluted engine oil.

Janicholson · Sep 21, 2019

If you are spinning it with the starter, open throttle, and charged battery, for at least 5 compression strokes, it should be about 75 to 85 psi. Jim

Speaking of H pistons.....

Absent Minded Farmer

Well-known Member

Janicholson

Well-known Member

Absent Minded Farmer

Well-known Member

randy hall

Member

Janicholson

Well-known Member

Similar threads