Another weber adjustment or ?

[red67]

with dougs excellent knowledge and the new info from him could you do a revised new point-by-point list again?? the point by point thing you did was so brilliant - its really really cool and simple to understand when one is adjusting carbs to have a point by point thing rather than a paragraph of text. i'm seriously gonna do a big print-out for my garage wall so i dont have scraps of paper flying about while adjusting.

peter zimmerman did a great carb adjust thing on here and rennlist a while back also with some good info.

[snbush67]

Originally Posted by red67

with dougs excellent knowledge and the new info from him could you do a revised new point-by-point list again?? the point by point thing you did was so brilliant - its really really cool and simple to understand when one is adjusting carbs to have a point by point thing rather than a paragraph of text. I'm seriously gonna do a big print-out for my garage wall so i dont have scraps of paper flying about while adjusting.

peter zimmerman did a great carb adjust thing on here and pelican a while back also with some good info.

I know, when I first tried this I had about 6 different sets of multi paged instructions that I had printed out, some made sense some didn't. I just wanted the no crap easy to read step by step instructions. So this is what I endeavor to complete.

When I go back now and read them they make sense but they aren't easy to read and an inexperienced person can get lost quite easily or get ahead of oneself. Determining when to adjust, unhook, run engine etc. were the hard parts for me to determine and a lot of the instructions seemed to take a lot for granted.

I think I can work on a simple list with a diagram and see where it goes.

[snbush67]

Edited, 6 post above. Should I start a new thread?

[2.70Racer]

Nice work Shane.
I'm comfortable tuning and synchronizing Weber's.
After a couple years reading, trying different things, and most of all listening to the folks on this site who've been there, done that.
Folks like Steve Weiner and Grady Clay sure know the details like emulsion tubes, which remain a mystery to me.
Not much clear info about emulsion tubes in the carb books I've read either.

I like your list, it's clearer than most I've read.
Thanks for your work,

[red67]

cool shane
gonna give it a go tonight with your revised list
nice work man.

[RoninLB]

E-tubes either richen the mix or lean it.

With 140 mains and F-11 tubes at 4k, 4.5k, 5k, and 5.5k rpm my EGT's are cooler than at lower than 4k when not fully dominated by the mains. EGT's don't increase at all at increasing rpms over 4k. The runs are in 5th gear for 10-30 miles flat throttle in Nevada. Idles are 60 @2.5 turns.

Have not same run tested 135 mains and 55 @ 2.5 turns yet but I presently can only assume same results with just the expected and wanted 25F EGT increase.

disclaimer: this is for a street engine




if interested in my EGT CHT JPI-700 aircraft engine monitor vid

http://www.avweb.com/marketplace/products/jpi-edm700.html

[SCrescue]

Mike,
I have F26 e-tubes that I'm looking to replace with F3s, so if you want to consider a trade, please let me know. Also looking to swap 30mm vents for 34s

Mike...

[snbush67]

Originally Posted by red67

cool shane
gonna give it a go tonight with your revised list
nice work man.

Thanks everyone for the comments.

Please let me know how it works out for you. I am in the process of research still and have discovered that most likely an initial side to side air sync is needed first and that the mix should be adjusted, and then the individual air screws, then side to side again, and then hook linkage, followed by 3000 synch. I do not have enough experience to say which is better and basically I think the end state is to say that it is a dance between the air and the mix and may take a series of checks. It is really down to experience and keeping all the carbs in synch while you are doing any adjustments. My list should get you in the ball park, but as my CAS (continuous adjustment system) isn't totally dialed in, I cant give it a 100% certification.

[red67]

hey shane we did the balancing tonight.
worked out great really fantastic and creamy smooth now.
i think for me the list worked out really great as a fantastic reminder before getting ones hands dirty. a really brilliant pre-flight checklist and quick ref guide while doing it if you like.

we deviated from the list in only a few areas:
point 1 started with air screws totally in.
point 1 didnt have a vial or adjust fuel pressure.
point 3 used an analogue RPM meter together with ears helping determine when the mixture screws lower or higher the idle as sometimes without the RPM meter its really difficult to feel the drop/raise. (maybe digital meter is better than analogue)
point 10 used the hand throttle to do the synch. (this is not really a deviation but thought it could be nice to put "handthrottle" on that point 10.)
have yet to attack point 13 - am considering getting color tune plugs for a true test.

yipppeee. my car is silky smooth again! so happy!

keep the list going and finetune it like webers. it's great man. so straight forward and clear.

but now driving i realise my brakes are really really spongey after winter hibernation... hmmm... new project..

[snbush67]

Great points, I will incorporate these. I am glad to hear the list worked for you. I will edit later.

[cfries]

I know this is an old thread, but lots of great information here. I do have one question. How important is the fuel regulation part. I have PMO's that I am trying to adjust and do not have a fuel regulator at this point. At 4.5lbs of pressure, would that cause issues? I do have the PMO regulator but have not installed it as I am having trouble locating the return fuel line. 1975 Carrera's did have it, right?

[RoninLB]

all CIS fuel injection had a return line

don't know about MFI

PMO instruction sheet had fuel psi at 5# even though everyone around here runs 3.5 psi. Info fed to us by a local pope.