Weber tuning with Lambda sensor - Page 11 - Alfa Romeo Bulletin Board & Forums
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post #151 of 156 (permalink) Old 12-24-2018, 11:31 AM
Richard Jemison
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Choosing LCs

Read the latest post on my Technical Questions or the Dynoed my 86 Spider thread today.

What others with cam designs totally different from any other doesn`t have any application to your engine.

What is your engine, induction lengths, use, cams installed, VVT or not, these are the factors that determine where to set cams.
As I posted Stock Alfa cams have excessive overlap at 102/102 if that`s what you have.

It`s X-mas -1 and I`m bored so here`s some info

Here`s the Best of Alfa`s production cams the 10548-01 and
Ed`s current cams in red Intake/exh

10548 03200 01" (Cam Data .401 Max Lift 10.2 mm lobe lift
Cam Lift Dur. at 0 lash. Factory LCs 99.5/99.5)
Ed`s cams
.018 286 (off the seat/lash, Paired overlap at 99.5 LCs is 76
.020 278 degrees, & way too much! at 104/104 = 56 degrees
.040 240
.050 230
.100 211
.200 173
.300 118
.350 83
.400 10

Eds intake & Exhaust cams currently RjR575 int 785 exh and next exhaust cam he`s going to install. (The new exh is an extreme power builder.)
Lobe lift Int,.503(12.8mm) Exh,.461"(11.7mm) New exh.495"
Intake RjR 575-----------------Exh RjR785-----------Exh RjRprivate
,010-304-OTS duration/lash-------------------------------276
.012--------------------------------287(lash/OTC---------------
.020-289---------------------------273---------------------264
.040-273---------------------------252---------------------252
.050-267---------------------------247---------------------246
.100-242---------------------------223---------------------228
.200-202---------------------------186---------------------194
.300-156---------------------------145---------------------156
.350-137---------------------------------------------------------
.400-120----------------------------89----------------------110
.450--81---------------------------125-----------------------65
.500---8---------------------------------------------------------
Overlap with cams set at 104LC each (add intake Overlap to Exhaust overlap for total overlap 105/105 LCs will reduce this overlap about 4 degrees total
27 degs.------------------------18.5 degs.-----------------26 degs.
Paired overlap-------------------45.5 degs.---------------- 53 degs.

Richard Jemison
RJR Racing

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Last edited by Alfar7; 12-24-2018 at 11:46 AM.
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post #152 of 156 (permalink) Old 08-13-2019, 06:41 PM
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I did my redneck data logging AFRs on my new motor with the higher compression Alfaholics pistons. My first runs were with 135 mains and 220 ACs. That was to lean.
Then with 135 mains and 210 ACs which gave me [email protected]
and then 130 mains and 200 ACs which was [email protected] I decided on the 135 and 210. The pull in 4th from 2000rpm was smoother with this as well.
The complete jetting is:
135 Mains
210 AC
f11 tubes
34 chokes
55f8 idle
Ed and anyone else, what do you think. Also posting on my new motor thread.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #153 of 156 (permalink) Old 08-14-2019, 07:51 AM
Richard Jemison
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AFRs

I did see 10s & 11s in your video, corresponding to "Tip in". AFRs under full power should be in the high 12s or low-mid 13s, other than the 2-3 seconds where the accelerator jets are spraying. Constant speed on level road about 14-14.5, and on "tip in" (accelerator jets spraying) drop to low 12s then leaner again as above.
Idle no load 14-5 -15 AFRs

Per Jim Steck there is measurabe power loss richer than in the mid 12s

Richard Jemison
RJR Racing

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Last edited by Alfar7; 08-14-2019 at 08:05 AM.
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post #154 of 156 (permalink) Old 08-14-2019, 05:48 PM
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Thanks Ed, Richard. There are two different runs with different jets and thus different numbers in the video. I can get 14-15 at idle but it spits back. Best smoothest idle is at mid 12s. 1st gear WOTs are a few points leaner than 3rd wots which are in the mid 13s with the 135 210 vs the 130 200 which is [email protected] in 1st.
It looks like my biggest deviation from the numbers are the cruise numbers @4000 which are high 12s to mid 13s. The ambient temp was 99 degrees and road was not perfectly level. I think I'm pretty close and will do some runs when it cools off. Also had the aircon on too, just to darn hot! It really is my best motor yet, imho.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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post #155 of 156 (permalink) Old 08-14-2019, 06:49 PM
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Idling is not influenced by anything in the emulsion tube stack. I have always ended up using the smallest MJ/AC combo that makes correct AFR at high power and does not go grossly lean anywhere else, but I have not used F11 tubes.
I did almost all of my testing in 3rd gear uphill. When I had found the best setup I did a final run in 4th. Sometimes it went a bit lean at the top and I had to drop a size or two in AC's.
You should do a test run in January to make sure that you are not tending lean.

Ed Prytherch
79 Spider
76 Suzuki GT500
2011 Jaguar XKR

A little government and a little luck are necessary in life, but only a fool trusts either of them. - P.J. O'Rourke

Last edited by alfaparticle; 08-14-2019 at 06:52 PM.
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post #156 of 156 (permalink) Old 08-14-2019, 08:07 PM
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Roger that! I have to confess, I would have bet money I had as I stated 55f8 idle jets in there but come to find out they were 45f8s. That was a surprise. Anyway I tried 40f8s and could get a good idle, still not 14 though, but the no load cruising was a lot "choppier". I take it easy on the black top road to my house and driveability is a big deal so I went back to the 45f8s. I'm looking forward to the thicker air and no ac load here in 3 or 4 months.

The passenger seat is 15 miles an hour faster than the drivers seat.

currently
2017 Giulia Q4
74 GTV restored daily driver
71 Berlina in 2L restored driver
the ones that got away:
1959 750 series Giulietta Spider Veloce
1962 Giulietta Spider normale
1965 Giulia Sprint normale
1972 GTV
1974 GTV
1974 GTV
1977 Spider
1974 Spider
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