Nova Side Port Spark Ignition and Nova Twin Spark

Home Model Engine Machinist Forum

Help Support Home Model Engine Machinist Forum:

This site may earn a commission from merchant affiliate links, including eBay, Amazon, and others.

Redbrown

Member
Joined
Jul 4, 2009
Messages
9
Reaction score
11
The Nova was a long stroke side-port diesel (compression ignition) engine. This one is different as the design has been changed to spark ignition.
The original plans came from http://www.modelenginenews.org/ thanks to the late Ron Chernich. The plans for the original diesel are still available in the form of the Motor Boys Plan Book, and gold they are to.
The original swept-volume of 4.5cc was retained but the head was made thicker to accommodate the spark plug thread. The crankcase pattern was modified slightly to make casting easier, and a set of points which use a flat on the rear of the prop driver added. The tapered crankshaft section of the original was retained, making it easy the set the timer arm to whatever position proves most convenient for operation. All the other parts are close to the original plans.
The Nova Twin Spark is an extension of the single, different crank case and extra cylinder. Enjoy the pictures. A most enjoyable project.
YouTube video available at

https://www.youtube.com/watch?v=9cjBRNIG24U&feature=endscreen

1 (11).jpg


1 (12).jpg


1 (13).jpg


1 (14).jpg


1 (15).jpg


1 (16).jpg


1 (18).jpg


1 (19).jpg


1 (21).jpg


1 (22).jpg
 
Hi Redhrown/Chris
A couple of great looking engines. There’s something about that classic look I find appealing. I love the blasted finish. Your raw castings look great are you using green sand or petrobond?

Very well done. Thank you for sharing this.
 
Points on the twin are automotive Bosch GL19, with the extra metal cut off. Single is also automotive but they are what I had lying around, sorry I cant remember the part number.
 
Alloy and plastic I use for these small patterns, it's less mess in the shed (wood Dust)
 
Back
Top