New Carburetor

Eric:

If the engine runs well -- except for hole-shot -- I would look at accelerator pump and engine timing. What is your current degrees of advance at idle?

With the accelerator pump, the instant that the throttle linkage moves, the accelerator pump must start to engage. No delay. Also, there are different cam profiles that will modify how the accelerator pump engages: duration, volume, timing, etc:. You may want to watch the video below for some good tips.

VIDEO LINK

JQ

shierh wrote: Need to use approved stuff for the ins company. if anything happens and you have a part that isn't approved then an exclusion in the policy will likely bounce your claim.   If its USCG approved then it is insurance company approved. I am not aware of a body of water in the US and territorial waters that are not under USCG authority.   They are the feds, trump all local and state.

Probably a smart idea to follow their regs anyway, then you are covered.

Little off topic:    Our Funny Car inlet fuel line from the tank to the pump is Aluminum 3" diameter!!   15 gallons in 5 seconds

shierh wrote: Double flair only has one more step outside of a single, whats hard about that especially on copper.   The sierra part doesn't appear to be a double flair. Isnt the double for higher pressure?   got to look it up I guess.

Good point on not being hard to do. Just need the correct tool. Yes on the dbl flare for high pressure. Another type uses a single flare but has a "flared sleeve" that mates up with the flared tube. We use that type on the race car a lot because you can tighten and loosen multiple times with out affecting the integrity of the tube flare.   NHRA and other sanctioning bodies allow the use of aluminum fuel lines but prohibits copper.   Don't know bout USCG. Seems to me that I read somewhere that the USCG rules only apply to waters that they govern. Different can of worms.

Double flair only has one more step outside of a single, whats hard about that especially on copper.   The sierra part doesn't appear to be a double flair. Isnt the double for higher pressure?   got to look it up I guess.

scootdogydog wrote: fuel line I updated this so Pete can add this along with tubes to his cart.

Scott, I like this one, looks well made and will take care of the bending issues plus no need for barb fittings.    

shierh wrote: The off the shelf tube isn't going to be made for the wedge, original tube is designed to hook up to a carb that is angled back, move it level and its off by 12degrees.

Steve,
You missed it:

8122pbrainard wrote: I did have to replace my hard line to the carb on the 302. I bought the PCM and did have to do some slight re bending at the carb since the PO put a wedge spacer under it.

Again, how's your double flaring skills?

I have brass on my boat. I think it came directly from PCM a few years back.

You could go to a link earlier in this thread that takes you to a thread with the link or you could click right about here

And where might we find the aforementioned guide?

shierh wrote: I may try to bend the hard tube, it is new and don't want to throw it out.    Second choice would be hvac copper tube, Got to dig out my flair tool and get a new tube bender.   Last will be rubber hose.

Steve,
Here's a link to the pre made hard line. Scott's took me to Overtons search page and all they sell are tubes!!    I 'd stick with the pre made since it's steel. I don't know if the copper would meet the regs. I'm sure Ken would know!

BTW, how are you at making double flares? The line is inverted double flared.

I may try to bend the hard tube, it is new and don't want to throw it out.    Second choice would be hvac copper tube, Got to dig out my flair tool and get a new tube bender.   Last will be rubber hose.

FWIW.     I run a length of "fire sleeve" over my gas line from the pump to the carb.   Not only gives some fire protection but also insulates the line and helps guard against vapor lock.   ALL of my fuel lines on my Experimental aircraft have fire sleeves on them.
Cheap insurance.

Guessing the biggest issue with changing carburetor angle and spacer size is going to be the hard fuel line.   What did others do regarding this issue?

WinterTurtle wrote: . Is there a consensus on how important / beneficial angled spacers are for the PCM application?

The issue you will run into is PCM uses their standard spacer as the PCV vacuum source, as far as I know there are no aftermarket angled spacers that have that port. I was able to make my own using a phenolic wedge,drilling a hole in the back to glue in a tube to connect the hose,then routing grooves in the base to the primary side to supply the vacuum copying the Holman Moody aluminum 2 bbl style.

8122pbrainard wrote: Sounds like it didn't have a angled spacer originally. How has it performed without one? KENO wrote: It's run for 40 something years without a wedge but some people like to run it more level with a wedge. Personal choice whether you do this or not

I haven't had it running yet but hopefully in the next ~10 days I'll be ready to give her a try.

If that's how CC built them then I'll not second guess. I'm just trusting the 'all original' vibe I got at first now that I'm seeing bad splices and duct tape and goofy workarounds for soft wood.

Sorry if I am being somewhat redundant. I am gradually seeing how much nautical specific knowledge I'm lacking as I tinker around with mine. Maybe I'll ask what kind of oil is best next