cox boxer engine please help

Jason_WI wrote:You could make it a rear drum valve engine like on the Cox Olympic or RR1 that I have. OS also has made rear drum valve engines. I have an old OS 80 Twin Plug, rear drum valve engine. You just need a small pin on the back of the crank to drive the rear valve.

microflitedude wrote:Reggie at VGE made some RR2's that used a rear rotary valve. He made an aluminum horseshoe back plate like you mentioned.

mitchg95 wrote:

Jason_WI wrote:You could make it a rear drum valve engine like on the Cox Olympic or RR1 that I have. OS also has made rear drum valve engines. I have an old OS 80 Twin Plug, rear drum valve engine. You just need a small pin on the back of the crank to drive the rear valve.

what about timing on it?

Jason_WI wrote:

mitchg95 wrote:

Jason_WI wrote:You could make it a rear drum valve engine like on the Cox Olympic or RR1 that I have. OS also has made rear drum valve engines. I have an old OS 80 Twin Plug, rear drum valve engine. You just need a small pin on the back of the crank to drive the rear valve.

what about timing on it?

If your wanting to keep it simple then you will have to have all cylinders fire at the same time otherwise you will need a roots blower to pressurize the crankcase to induce the charge to each cylinder.

JPvelo wrote:In order to have all cylinders fire at the same time you will not only need to make a crankshaft but rods with removable end caps to go on said crankshaft. What type of machining ability/equipment do you have at your disposal?
If I were making a rear drum engine I would try putting the pin on the drum and have it interface with the hollow on the crank pin of a killer bee crankshaft.

mitchg95 wrote:

JPvelo wrote:In order to have all cylinders fire at the same time you will not only need to make a crankshaft but rods with removable end caps to go on said crankshaft. What type of machining ability/equipment do you have at your disposal?
If I were making a rear drum engine I would try putting the pin on the drum and have it interface with the hollow on the crank pin of a killer bee crankshaft.

i am starting a cnc machining class at a community college this week, and they have lathes, drill presses, cnc machines and many more

JPvelo wrote:

mitchg95 wrote:

JPvelo wrote:In order to have all cylinders fire at the same time you will not only need to make a crankshaft but rods with removable end caps to go on said crankshaft. What type of machining ability/equipment do you have at your disposal?
If I were making a rear drum engine I would try putting the pin on the drum and have it interface with the hollow on the crank pin of a killer bee crankshaft.

i am starting a cnc machining class at a community college this week, and they have lathes, drill presses, cnc machines and many more

Sounds like fun, where do I sighn up?

JPvelo wrote:In order to have all cylinders fire at the same time you will not only need to make a crankshaft but rods with removable end caps to go on said crankshaft.

ahrma_581 wrote:

JPvelo wrote:In order to have all cylinders fire at the same time you will not only need to make a crankshaft but rods with removable end caps to go on said crankshaft.

Or one piece rods and an assembled crank, which is normal roller crank practice (motorcycle, way old VW hop up, boats, etc.). Altho then you are stuck with truing the thing, which is usually done with a BA lead hammer...