Views: 136

Reply to This

Replies to This Discussion

Oops I just realized that 5 6 7 and 8 are out of order. But the burn is the same.

I might start with a check of the engines timing.

I would be checking you're carb. I think the one side had plugged main metering jet.

My guess would be an ignition issue

This deserves  more than my initial very short explanation.

The spark plugs have a very interesting pattern that just happens to match the runner pattern on most common intake manifolds. The carburetor barrels do not go  directly to the associated cylinder banks.The pattern on most production automotive V8 engines is the front and rear runner on one side ties into the two middle runners on the opposite side. This is done to equalize runner length and to keep the overall engine height down. No, this does not apply to all engines and especially performance high rise manifolds but for our stock Ford 427s and Chevy small and big blocks, it applies.

Not saying Mark does not have any ignition problem but the spark plugs indicate rich mixture on 4 of them. The other 4 are dry and show little presence of combustion.

Weak or no spark will lead to wet plugs on the cylinders that receive fuel but have no spark. This is not what Mark is showing us.

Timing issues will cause plug readings to be consistent across all of the plugs.

A bad distributor cap will usually create issues on associated cylinders and having this unique pattern is very unlikely.

I suspect that the idle portion of the carburetor is functioning on both sides so the engine might idle okay however the main meter circuit for the one side is likely plugged.

Popping off the flame arrestor and carefully observing inside the of the carb while the engine is running will give you the final answer. Burping the throttle will likely show that the one side is dry and the other is metering gasoline to the engine.

I would also recommend caution in that the one side of the carb is likely running very lean and backfires due to low flame velocity is likely to be experienced. Using a mirror to see down inside would be a very good idea if you value your eyebrows.

I agree with Ronald about the indications on the spark plugs --definitely 4 are showing too rich and the other 4 running hot/too lean. He also has a great idea on the possible cause . I didn't know the engine type in question--but in the original post it seemed as if the spark plug pattern was a gremlin but almost a  incidental finding. I was wondering how well the engine was running?

Captain Ronald, upon further diagnosis you are exactly correct. Compression is 145-150 across all, timing is spot on, valves are all within tolerance. So going on the advise of the supreme Commander Morland, I took the arrester off and when I burped it I found fuel only coming from one side into the primaries. I did not have a vac gauge with me at the time, but will have upon return. I had my idle screws set on 2 1/2, I ran them in until the engine changed and then backed up 1/4. However when I discovered the one sided conversation in there. I removed the carb and retired to the cave. I disassembled, cleaned and blew out again. The only thing I found was I left the top spring and retainer off the acc pump. I have replaced it and reassembled. The truly sad part is I can not get back to the boat until Sunday! I am learning to be a carb man, so this may take a while. I am confident in my work, well other than the one little mistake. However I am not confident in my super tuning abilities.....yet. I want to thank you all for the help. The one thing I have been able to count on during this project is some outstanding help from this group!

Reply to Discussion


Club News

Spring 2019 Styled In Fiberglass is now available!!

The Chris-Craft Commander Club publishes it's newsletter, Styled In Fiberglass, twice a year and the 2019 Spring issue is now available for download.  Click here for more details and to download this issue.


Help Wanted!!!

New Faces, New Perspectives - Executive Committee Openings to start in January 2020

Would you like to be more active in the Commander Club? Would you like to help chart our course? Are you willing to commit the time, energy and creativity needed to assist us in promoting and supporting our mission?

We are searching for new faces and new perspectives. Positions start in January 2020 for a two year term.

There are four positions available. Chief Commander, Treasurer, Public Relations Chair and Membership Chair.

Duties for each position are located in the bylaws

More details about each position here.

The Executive Committee (EC) convenes monthly via conference call. Meetings typically last 90 minutes or less. Most work done via e-mail. Each job has its own time commitment depending on club activities. Current EC members will mentor you.

Interested in any of these positions?

Please drop Char Pike an e-mail at


SuperDisc 14.0 and Resource Collection 4.0 Available Now!

SuperDisc 14.0 is an electronic encyclopedia of every aspect of Commander maintenance and repairs. The information on the disk is retrieved from the discussion forum and e-mail list, but organized in a way that makes information easy to find and use. SuperDisc is available on USB flash drive

Click here for more details

The SuperDisc 14.0 Complete Edition is for first time buyers of SuperDiscs.

The SuperDisc 14.0 Upgrade Edition is intended for those who wish to upgrade their SuperDisc 1.0 through 13.0. Each year we add over 1,000 posts. Don’t miss out.

Resource Collection 4.0 is great to own too!!!

The Resource Collection 4.0 contents include CC Catalogs and Brochures. CC Service Bulletins, CC Price Lists. Engine & Transmission Manuals. Dick Avery sketches and drawings, a folder for every Commander model, and all kinds of technical and interesting stuff. Over 187 folders and 2,563 Files. A true “Treasure Trove” for the Commander owner!

We thank you for supporting the club with your purchase of SuperDisc14.0 and/or Resource Collection 4.0. We hope you find it to be the value we feel it is, and trust you will enjoy the other benefits your payment will help provide. It’s your payment that helps to support the activities of this dues free organization that has grown from 12 members in 1999 to well over 4000 members in 2019.

To order now click here!


© 2019   Created by CCCC Webmaster.   Powered by

Badges  |  Report an Issue  |  Terms of Service