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#4901 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
Good morning you'all thank you all for following along, the plan for this rainy morning is to weld in some O2 (Oxygen) sensor bungs into the LMC Truck dual exhaust and see what the Air Fuel Ratios look like (AFR)
this will serve as a baseline for tuning the carb before we put our dreaded Hooker competition long tube headers back on and I got another exhaust surprise for you all so here we go |
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#4902 |
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
so rather than taking the perfectly good non leaking exhaust manifolds off I decided to weld in some O2 sensors and weld up these LMC Truck exhaust pipes cause it don't even sound half bad, so lets see how it breathes
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#4903 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
X marks the spot
the passenger side first... this Harbor Freight step drill bit aint half bad it ain't pretty but it will hold |
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#4904 |
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Location: Sacramento, CA
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Re: Restoring Rusty
and passenger side all weldered up and ready to go on
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#4905 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
and on to the driver side, rinse, lather, repeat
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#4906 |
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Location: Sacramento, CA
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Re: Restoring Rusty
and driver side all weldered up and ready to go on
keep in mind this is the LMC Truck 2 1/4 exhaust system that normally would go over the axle and out the back, but not on this bad boy, we just turn it down out right quick after the mufflers |
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#4907 |
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Location: Sacramento, CA
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Re: Restoring Rusty
So after allowing the truck to warm up and taking it down my test circuit here are the AFR numbers
Idle: 11/12 (that is too rich but easily adjusted with the two idle mixture screws) WOT: 13/11 (this is what drives me crazy why are these not even? I thought we fixed the bad rings on the cylinders) Cruise: 16/15 (So a bit lean) and it backfires and chokes on acceleration in 2nd gear, so some carb tuning is in order however when I blimp the throttle it revs up nice and even, no hesitation or spit and spatter there, so the accelerator pump seems dialed in still running the 63/67 jet combos, may try 64/69 Last edited by Gregski; 10-15-2016 at 08:38 PM. |
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#4908 |
Registered User
Join Date: May 2016
Location: Ohio
Posts: 274
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Re: Restoring Rusty
How does it sound? Any droning?
Posted via Mobile Device |
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#4909 |
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
Great question, sounds good, like a baby 60's muscle car, ha ha
Comparison: not as loud as the Flowmaster Series 40 mufflers but louder than the Magnaflows Yes there is a little bit of drone at idle for me thats at 750 RPM but even above 1000 RPM its very smooth Silent at speed on a highway For the money this LMC Truck dual exhaust is a very good choice for a do it yourselfer, easy install, Mike did a great job building it 40 plus years ago |
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#4910 |
Registered User
Join Date: May 2016
Location: Sun City, CA
Posts: 34
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Re: Restoring Rusty
good to hear rusty is still going
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#4911 | |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
Quote:
Note To Self: some day do a study of timing advance and the correlation to truck gitty up Last edited by Gregski; 10-20-2016 at 09:52 PM. |
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#4912 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
So more of Truck Doing Truck Things, picked up ALL this hot rolled steel at S&K Steel today for only $10 bucks (unlike the home improvement stores those prices I can live with - I'm looking at you Home Depot)
Last edited by Gregski; 10-20-2016 at 09:49 PM. |
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#4913 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
so believe it or not we got enuff raw material here (ha ha) for not one but two projects
first we will build ourselves a Pipe Weldermatic Jig, so instead of clamping pipes to our patio table with C clamps and welding crooked exhaust we will jig them up in the angle iron on top of the two sliding plates to allow for weld beed rotation as such and we should end up with less crooked exhaust |
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#4914 |
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Location: Sacramento, CA
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Re: Restoring Rusty
Alright, time for a mathematical word problem, (remember those from sixth grade math)
Here we go, Greg drove his green truck to S&K Steel to buy 5 pieces of steel. He used 3 pieces for his welding jig project. He still has another project to do. What color is Greg's truck? ha ha |
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#4915 |
Registered User
Join Date: May 2016
Location: Ohio
Posts: 274
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Re: Restoring Rusty
Sunset orange. Aka rusty 😉
I get what the angle iron is for but what are the two pieces of flat stock used for with the welding jig? Posted via Mobile Device |
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#4916 |
Registered User
Join Date: May 2015
Location: Parma, Ohio
Posts: 35
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Re: Restoring Rusty
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#4917 |
Registered User
Join Date: May 2016
Location: Ohio
Posts: 274
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Re: Restoring Rusty
Ahh, I see. Makes perfect sense now. Thanks.
__________________
1972 K10 1986 K30 crew cab dually 2002 Z06 2007 Escalade |
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#4918 | |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
Quote:
I may have not made it obvious with just the two long pieces until today I realized the vertical wall will need spacer too, so I divided them by 2 |
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#4919 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
yep, the spacers allow for full 360° rotation of the pipe whilst welding, so the bead doesn't touch the wall and make things crooked
note the offset spacers to the right, in other words they ain't in the middle of the angle iron, that's to allow for the pipe to be welded to the muffler |
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#4920 |
Post Whore
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Location: Sacramento, CA
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Re: Restoring Rusty
so I am having to add 1.5 quarts of water to the radiator after a week of driving, roughly 200 miles, I aint too happy and I don't know where the water be going
one more observation, last time I topped off the radiator on Saturday and on Thursday I noticed it was just over 1/2 a quart low (20 oz) this is peculiar since I did not even drive the truck for those 5 days this week things that make you wanna go "Hmmmm" |
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#4921 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
time to go to our Thinking Chair
(some of you with no kids may not get this) |
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#4922 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty - Cylinder Head Pressure Test
so went and visited Nichols and Sons Machine Shop in Sacramento and the only person nicer than the guy I talked to was his dan Glenn and the only nicer person than him was his dad, Mr. Nichols I presume, these guys are wonderful
so got some quotes $20 bucks to magnaflux cylinder heads (brought in assembled minus the rockers) $80 bucks to pressure test them (this does not include the magnaflux and if they decide to pressure test them they do not magnaflux them) I assume that's per set, and not per head but that got me to a thinking, what will the Greg a learn if he just drops off the heads and the Nichols tell him they is cracked or leaking... nothing but if he do it himself, he will be that much smarter so far our materials are: $10 bucks for the steel plate $10 bucks for three pieces of 1/4 inch thick 3 inches wide by 20 inches long black rubber in the pic on the far left (safety first) ha ha |
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#4923 |
Post Whore
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Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
alright so first we gotta make some metal shavings
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#4924 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
man that plate looks nice, I would totally tap that
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#4925 |
Post Whore
![]() Join Date: Aug 2014
Location: Sacramento, CA
Posts: 10,833
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Re: Restoring Rusty
so let's try it on for size
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