carb conversion has begun

[rfuerst911sc]

As many of you know I struggled for a year trying to get a EFI conversion to run properly on my 83SC. I threw in the towel about a week ago and have sold most of the hardware. This past week my mechanic ordered the complete 46mm PMO kit and it should arrive next week. I shipped this morning my distributor to Barry Hershon in Detroit to have it recurved for the carbs. I ordered from Pelican new Clewett ignition wires and I have new plugs,cap and rotor waiting to be installed. If the distributor makes it back to Florida when I think it will I will be running the beginning of March. My mechanic is installing everything and he just did this install on another 3.0 and he said the owner is very happy. I can't wait to get my car back and be able to drive it!!! The 12 hours of Sebring is coming up and I am looking forward to driving my car to the event. Plus autocross season is around the corner. I'll take pics when I get her back.

[mb911]

very cool.. glad you found something to work for you

[lonewolf]

46s on a 3.0 ?
whats done to the motor?

[rfuerst911sc]

The 46's are being sized for the stock motor. This will allow future upgrades in displacement and camshafts. There are a couple of stock 3.0's in Orlando running 46's with zero issues.

[Eagledriver]

46's aren't scary anymore. PMO seems to have really dialed in the transition ports and with the nice tight shafts there are no problems. 40's actually leave about 10-15 HP on the table. The hard part is keeping the revs below 7000. It would help to go with bigger ports when you have the heads off someday.

-Andy

[911 tweaks]

can you explain just what you have for an engine. I am just about done completley diss-assembeling...cleaning...re-assembling a CIS intake system. AND, if it dosent work or I cant get it to work well, I plan to buy PMO"s (though, I was just about to go MS + ITB + ...and drop $5-8k...I think NOT!!!)

I would rather go w/ pmo's for $3500 + how much to have the dist re-curved?? (ANYTHING ELSE NEEDED??) And why do the dizzy if a stk? engine?? Care to share what the carbs will be set up to so they can be used now w/ stk? engine AND in the future if and when you do engine mods??
Thanks for your info.
Bob

[mede8er]

I'm subscribin'.....

My PMO's will be here any day....

[rfuerst911sc]

The engine is a stock 83SC internally but I have SSI heat exchangers/headers with a M&K 2 in 2 out muffler. Richard Parr ( PMO ) recommends that the stock distributor be recurved to run with carbs. Barry Hershon is referenced on the PMO website as the place to send the dist. for the rework. I called Barry and he is very knowledgeable when it comes to distributors. He beadblasts the distributor clean than does his magic on the inside to recurve the ignition map. He removes all the vacumn mechanisms so it ends up mechanical only. Barry is charging me $300.00 for this service. I really don't know the details of the carb setup because my mechanic is the one that ordered them but I do know that the venturi's and all jets will be for a stock 3.0. I went with the 46's for two reasons. One the 40's are on a 5-6 week backorder and two my mechanic has set up several 3.0 engines with 46's with no running issues. With the 46's in the future if I bump the engine size and add some hotter cams they have the ability to handle the increase. As eagledriver suggests in the future if I have the motor apart I would have the intake ports opened up as part of a rebuild. I think I am going to end up with a nice street driver and she'll have some grunt for Auto-X and the occasional DE. In the future if I rebuild her it will have even more power and the carbs will have the ability to support it.

[911 tweaks]

thanks and great summary of what I asked about. Please keep all of us posted as you proceed through this project.
I for one would love to know what you end up spending, parts used... what the performance +/- you find vs. the CIS? as I think you were never able to get the MS/EFI to work, right?

Thanks again!! How about some pictures as you do this work...I for one am drooling with anticipation of how this will be for me when I (may ;-) do this if the wonderful CIS I am almost done with works.!!!!!!!!!!!!!!!!!!! (I am praying that the cis sucks and dosen't work...don't work...don't work...don't work...don't work...have I ginkxed (sp) it enough?? :-)

Keep at it and "give me pictures or give me your parts!"

Bob

[rfuerst911sc]

Unfortunately the car is at the mechanics shop so the only pics will be the "after". Cost will be in the $3700.00-3800.00 range including install. Should be set for many years.

[JP911]

The sweet spot for a single plug car is about 36 degrees of (total) advance. You're going to love the PMOs.

[Facey]

as i found out it depends on CR and a bunch of other variables.

a high cr car will need less advance.

[shbop]

Are you keeping the stock fuel pump and adding a regulator,(which one?), or are you changing out the stock pump for another?

[rfuerst911sc]

Keeping the stock fuel pump and useing the PMO fuel regulator. We purchased the complete kit so it includes carbs,manifolds,air cleaners,fuel regulator,heat spacers,linkage,longer engine studs etc. it is a complete kit.

[shbop]

got it. Thank you!

[Kevin Stewart]

I have said it before the cis stuff on the sc should be shot, That was the main reason i took the 3.0 out and put the 3.6 in was that cis, Kevin

[NY65912]

More carb converts.....I love it!

[herman maire]

I thought the guy from out of town had your STB set up running awsome!! what happened? PMO's are going to be sweeeet.... just surprised you had that much grief with your STB's.

[rfuerst911sc]

herman we had it running great for a few hours then the next morning it ran like crap. After 1 year of playing with the tuning I was done. A year ago I was making the decision to go with either EFI or carbs, in hindsight I should have gone carbs.

[holtjv]

Keep us up to date on how it goes--interested mightily. Jack