 A/F readings, What do the experts think? |
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| Black22 |
 Aug 19 2012, 04:47 PM
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#1
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Senior Member  Group: Members Posts: 886 Joined: 1-November 07 From: Creswell, OR Member No.: 8,290 Region Association: Pacific Northwest  |
Hey all,
I've got a 1911cc motor with about 250 miles on it. KB pistons, stock cam and L-jet, with 1.8l heads modified to 2L valve sizes. Compression is 8.5:1. Running Brad Penn 20/50. Car was recently running way rich and got VERY poor gas mileage. I hooked up with Joe Sharp, (thanks again Joe!) and he let me use his LM-1. I tried to dial my L-jet in and got pretty close. I've since purchased and installed an Innovate MTX-L AFR kit. Gauge works great! Here is my readings as of now and after MUCH tweaking this is my dilemma. AFR stats: Idle= 12.7 WOT= 9.7-10.2 (it will hit these readings regardless of RPM) Decel= 14.8-15.9 Timing is set @ 7.5* @ ~900rpm with vacuum ports disconnected and plugged. WOT seem rich still, but now my motor runs hotter. I know I'm leaning the motor out and should expect higher oil temps but I was running about 190-200 and now I'm running 210-220. I'm also running an external 72 plate oil cooler w/fan! I've adjusted the timing to experiment, and had it at 9.5* adv. and it ran cooler at idle but the temp went back up while driving. It seems I have some more adjustments to get it even leaner, but that's just going to raise the temps right? (IMG:style_emoticons/default/confused24.gif) What do you guys think and what should I do (if anything) next? |
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| aircooledtechguy |
Aug 19 2012, 09:55 PM
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The Aircooledtech Guy Group: Members Posts: 1,966 Joined: 8-November 08 From: Anacortes, WA Member No.: 9,730 Region Association: Pacific Northwest |
X3 on the CHT gauge. Oil temp is VERY slow reacting compared to CHT. Your heads will be long cooked before the oil temp begins to register a problem. A $100 CHT gauge = 5 cans of formula or 4 packs of pampers, or. . . Better get it NOW before you have no $$$ at all. (IMG:style_emoticons/default/poke.gif)
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| Black22 |
Aug 20 2012, 04:25 PM
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#3
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Senior Member Group: Members Posts: 886 Joined: 1-November 07 From: Creswell, OR Member No.: 8,290 Region Association: Pacific Northwest |
QUOTE(aircooledtechguy @ Aug 19 2012, 08:55 PM)  X3 on the CHT gauge. Oil temp is VERY slow reacting compared to CHT. Your heads will be long cooked before the oil temp begins to register a problem. A $100 CHT gauge = 5 cans of formula or 4 packs of pampers, or. . . Better get it NOW before you have no $$$ at all. (IMG:style_emoticons/default/poke.gif) Alright, alright, I gave in and ordered the same one McMark posted about in another thread. They say these things show temp changes immediately. Will I be able to adjust timing and see this thing react? I'm not going to run the car until I install this gauge. Thanks for the help guys! |
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| rwilner |
Aug 21 2012, 11:17 AM
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No Ghosts in the Machine Group: Members Posts: 953 Joined: 30-March 10 From: Boston, MA Member No.: 11,530 Region Association: North East States |
QUOTE(Black22 @ Aug 20 2012, 06:25 PM) Alright, alright, I gave in and ordered the same one McMark posted about in another thread. IF this is the micro 1000 gauge, it's the same one I have and it works great. QUOTE They say these things show temp changes immediately. Will I be able to adjust timing and see this thing react? Yes -- it reacts pretty much instantly. |
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Posts in this topic
Black22 A/F readings Aug 19 2012, 04:47 PM
Racer Chris You need to adjust the wiper inside the AFM to lea... Aug 19 2012, 05:21 PM
Black22
You need to adjust the wiper inside the AFM to le... Aug 19 2012, 05:28 PM Racer Chris You should get a CHT gauge.
Leaning out the mixtur... Aug 19 2012, 05:41 PM rwilner ::Disclaimer -- I am not a member of the expert co... Aug 19 2012, 06:00 PM Black22
::Disclaimer -- I am not a member of the expert c... Aug 19 2012, 06:35 PM brant too rich...
with only 250miles on the rebuild you... Aug 19 2012, 08:18 PM Black22
Alright, alright, I gave in and ordered the same... Aug 21 2012, 11:21 AM 76-914 Congratulations to you and your beautiful wife. Sa... Aug 20 2012, 06:38 PM Racer Chris
Have any of you guy's ever tried to set your ... Aug 20 2012, 07:03 PM Black22
Congratulations to you and your beautiful wife. S... Aug 20 2012, 08:45 PM |
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