You may recall a story we did a couple months ago regarding Rocket Mans “Performance Issue” If not we will have a link at the bottom of the story as a reminder. It takes courage to be so open about “Performance Issues” So it’s important that we all support Rocket Man and thank him for the update on his condition.
Sequel to Rocket Man pinging and performance issue
Okay so previously story went something like this – Rocket Man is having a performance issue. Pinging at high RPMs and won’t make it to 3,000 RPMs.
Lots of great opinions from the readers – listed here:
2. Fuel Mix Too lean
3. Plug wires switched at
4. Go back to points
5. Distributor springs too weak
6. Carbon buildup in engine
7. Dirt in carburetor
9. Higher Octane fuel
10. Worn cam
11. Valve clearances
12. Octane boost
13. Carb jets
14. Wrong valve springs
The most popular response was number 4 – Go back to points. Five responded with that advice.
I also had three well respected people that have helped me along the way, weigh in and there responses were distributor issue, wrong prop and wrong high speed jet in carburetor (fixed in there now versus adjustable).
Now to give a little more background I had gone through everything on this engine and it was either replaced or rebuilt EXCEPT the distributor. Hey, it started, idled smooth and ran good up to 2,000 RPMs. Why worry ?
Well being an engineer and knowing I am supposed to get 3,000 RPMs is a bad combination for settling.
Here is the rest of the story. First action – new larger style distributor and Pertronix from Jim Staib. Jim’s advice was based on the fact that if Chris Craft switched to the larger distributor at some point it was for a good reason.
Well what a difference ! No pinging at all, cleaner exhaust, and 2,700 RPMs all day !
Not quite there yet but a whole lot better. Next was getting 12 x 12 prop from Jim. That was installed and the next run I got my 3,000 RPMs ! Great feeling.
Blow is ….. a…dash photo proving 3,000 RPMs
Okay so I now have a new appreciation of anyone taking photos at high speed while driving the boat. Right at the instance of taking the photo I got waked by a speed boat and now you can see me generator was charging nicely and my bilge pump was not running. Oh well.
Not to slight any of the opinions given – they were all great suggestions and appreciated.
Now the last dilemma that I need help with. It was Jim Grant on the high speed jet advice and I trust him very much but with what I have going for me now is it worth changing that jet out ?
Mark Bigda – Rocket Man