Cooling System Mods

[Barry Bordes]

Originally Posted by phoenix7

"Improvements in the cooling system brought the maximum temperatures of the rotor housing trochodial wall to below 410*F. But the final improvement was the redesign of the housing itself. The bosses for the tension bolts which held the engine together were relieved from the inner wall of the housing, thereby relieving part of the mechanical restrictions on the part that gets the hottest. Repeated testing after this improvement produced no more cracks in the housing."

Phoenix7, do you have pictures of how "The bosses for the tension bolts which held the engine together were relieved from the inner wall of the housing". Were they severed completely? The housing wall just floated? For how far?

Very Interesting, Barry

[Phoenix7]

Originally Posted by Barry Bordes

Phoenix7, do you have pictures of how "The bosses for the tension bolts which held the engine together were relieved from the inner wall of the housing". Were they severed completely? The housing wall just floated? For how far?

Very Interesting, Barry

No pics at this moment. I'll look and see if I can find the info when I get home. That excerpt came from the most recent book on the rotary egine (released 2007 or 2008) and this section's source was an SAE paper from 30 years ago. I'll let you know which one (in case you can access the SAE papers) in a bit.

Originally Posted by Barry Bordes

I actually did two housing mods. The first was to enlarge the passages in the hottest areas next to the sparkplugs as shown in Yamamoto's housing temp diagram.
But use caution! I cut through on the lower side of the Trailing plug. A bad combination of new carbide burs and being too large. 1/4" long shaft would probably be best.

I see! thanks, good stuff.