Engine mounting dims
I just got my Suk this week and was measuring the dimensions from the cowl lip to firewall. ....6.75" is the farthest I would go on the cowl mounting, with efforts to keep it from flopping around under vibration. So... 7" to spinner back plate looks like the sweet spot without changing the firewall. I might stretch the standoffs further with my light 80cc single for a spinner backplate of 1" to 1.25" past the cowl lip as it looks acceptable these days to add some clearance for better prop pull forward of the radial cowl. Nobody seems to notice a performance difference but hey....with that wing tube placement at slightly less than 1/4 of the wing chord, it's got to help reduce the nose lead somewhat since that CG's in that "general" vicinity. You folks with the Zenoah twin got it soooo nice...just bolt it on to the firewall with "already installed" blind nuts.