03-25-2010, 07:09 AM #91The differences between the 60 and 75 were very likely present in the 'Scott 60' that set the NOA unlimited record at nearly 52mph ca. 1959
03-25-2010, 07:24 AM #92
I was there, we raced NOA OPC 1958-60. At the 1958 NOA nationals in Nashville clamp brackets (or swivel brackets) broke
on seven Scotts. McCulloch flew in replacements to Leatherwood's team. I could generally outrun all Scott 60s on light boats (123' Norris Craft) Norris Lake with my Mark 58A, I'd be the last to claim that the 40s and 60s that set NOA records were stock. Am pretty sure they weren't, there was never a motor inspection in OPC 1958-60.
Last edited by smokin'joe; 02-13-2011 at 10:15 PM.
03-25-2010, 07:41 AM #93
03-25-2010, 07:50 AM #94
How do I know about the 60/75 stuff? Because I have a technical paper from McCulloch Research asking Champion Spark Plug to help them develop the cylinder head for the 75. The 75 parts just did not exist that early.
You know as well as I do that all time trial record setters are disassembled and checked to be at previously supplied and approved (by the sanctioning body, not the manufacturer) factory spec. If the porting or compression vary from a regular motor ... the record does not go in the books.
03-25-2010, 09:10 AM #95
The motors, especially the unlimited class motors, were never torn down in NOA OPC after records. I'm going to post and send you a McCulloch ad listing their NOA records. At the 1958 NOA Nationals in Nashville they flew in parts, clamp brackets on 6-7 40s and 60s broke during the closed course race. The marathon nationals were next day.
03-25-2010, 09:47 AM #96
Here's where you can see the Scott ad listing NOA records: pg. 131 of Hunn's "The Golden Age of the Racing Outboard". For those of us on the east coast, to a first approximation WOA did not exist. Recall also that McCulloch sent the twin powerhead hydro to Knoxville to try to break the NOA Class X Record.
03-25-2010, 05:18 PM #97
Here's the ad again. Other than Hunn's book, do you know where it was used?
03-25-2010, 05:46 PM #98
04-25-2010, 09:29 PM #99
I started taking one motor apart the other day, have you seen this done to the intake runners before?
04-25-2010, 09:34 PM #100
Yes, its called stuffing. Its done to increase velocity
04-25-2010, 11:29 PM #101
Well, I found an original HRE cylinder head. I've been wondering the whole time I've known about this motor whether it actually ran with the battery ignition or whether it was a work in progress that was never completed. Now I'm pretty sure it was run with the battery ignition ... when I removed the bottom head - the piston ring was imbedded in the head. The piston did not seem to be damaged, nor was the bore.
02-13-2011, 02:44 PM #102
Greetings Guys. Maybe Mark75H or one of you can identify this motor .........It is in an early 60's mid-engine racecar I have. ????
Dave Perry OldSchool Restorations of North Alabama
02-13-2011, 03:56 PM #103
Old School Restorations
the slightly different 70 hp block. Ignition system is not OMC,
powerpack and coils are missing. Has had other carburetors adapted.
Missing the exhaust tuner (that means lost hp). Easy to get parts for the
Last edited by smokin'joe; 02-13-2011 at 08:26 PM.
02-13-2011, 09:55 PM #104
02-13-2011, 10:03 PM #105