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Unread 03-11-2013, 09:23 PM   #1
RockRollin
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latest mpg

My last trip to the Sylva, NC area (205mi) I had on round trip 13.75mpg. However I am running lean and could not break 65mph without heating past my comfort level. I will be re jetting and in a couple of weeks I will re post my results. This with the Holley 1850 & Edel 2131, timing at 16º.

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"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 03-11-2013, 09:30 PM   #2
super98lsc
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what temp was it running up to? Curious as mine will warm up near 205 when cruising 75+. Under 55 it cools back down. New rad etc. Doesn't matter what I do w timing or fuel.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 03-11-2013, 09:31 PM   #3
duckyde
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Quote:
Originally Posted by RockRollin View Post
My last trip to the Sylva, NC area (205mi) I had on round trip 13.75mpg. However I am running lean and could not break 65mph without heating past my comfort level. I will be re jetting and in a couple of weeks I will re post my results. This with the Holley 1850 & Edel 2131, timing at 16º.
Is this with stock exaust manifolds as well? and also what year is your rig?
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Unread 03-12-2013, 03:56 AM   #4
RockRollin
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It was getting to the 220º mark, confirmed with IR thermometer. It usually stays at 190º . If I came to a stop and floored it, back down to 205º it would go.I'll step up a size in jets and it should come back to comfort zone. Plugs were a bit lighter than I care for.
Yes stock manifolfs, crappy exhaust, can't decide for sure on what to do with exhaust (or maybe lazy). The exhaust will happen in the next couple weeks, I'm thinking custom y-pipe, and 2-1/2" single out the back.
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"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 03-12-2013, 08:59 AM   #5
CSP
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If your timing is base timing (vs total advance) it's way too high for your altitude and probably is contributing to the high water temps. We don't even run that much advance at 6000'.
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Unread 03-12-2013, 09:37 AM   #6
RockRollin
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10-4 on the timing. I have been picking at the amount of advance by reducing the vacume actuator, still nowhere close to preignition. I also have the slight surge at 60mph which also points to fuel starvation. I'm not set in stone on the timing yet, but I do like the throttle response.
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"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 03-12-2013, 09:43 AM   #7
super98lsc
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My timing in Austin is at 12 initial and 31 total, not counting vac. Im on a 93 only diet though. If I back it out it loses power and 2mpg so the 93 costs more, runs better and ends up same $ per mile. I will say im using a catless 2.5 single dynomax.off the stock Y with heat riser blocked open. I want to know if hedmans will fit this rig so I can run dual 2.5" on pass side. Single 2.5" simply isnt close to enough flow once the top end is done. decent cubes large valve heads,Ports these amc need to breathe. I am certainly going to rid it of the heat crossover crap. Carb and oil cooker 9000 option from factory = crap tastic. Same goes for egr.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 03-25-2013, 08:12 PM   #8
RockRollin
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Step up in jet size from 65 to 68. The temp is steady at 185º, at 70 mph, the surge is gone, I have some tan on the plugs. Timing is still at 16, economy is down to 13.25 on one full tank. I'll go another full tank and record before I adjust timing again. The vacume increases about 3in hg from 12º to 16º adv. It seems pretty steady, no pre-ignition, great skinny pedal response. Still seems wrong. Oh well tweak and record.
__________________
"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 03-26-2013, 07:06 PM   #9
super98lsc
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What seems wrong? The more overlap the cam has the more cruise fuel it will like to a point if you target.14.4:1 under very light loads with and increase to 13.8-14.2 when just slightly accelerating it should feel good. Any l leaner it will surge and feel flat. Talk about tons of tuning on my 4.7 Stroker with that monster solid Lunati grind.....and thats with computer controlled timing that can do nearly whatever I want. Took us a while to dial it in.
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06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 03-26-2013, 08:02 PM   #10
RockRollin
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Just the 16º initial adv, I need to simulate the vacuum advance and see where total is, then ill set my mind at ease. It seems like the last few weeks I've have the hood open for ten minutes at a shot, then I'm hailed off to something else. It is running better than ever, even with the vacuum vibration. Just need some focused time to do a final check out, then when I get it just the way I want it, well then I'll probably find something else I wanna change
__________________
"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 03-26-2013, 08:48 PM   #11
1983Chief
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I just put an electric fan on my Chief with a MCX 350 and have an Edelbrock 650 on it and im getting around 14 hwy. Ill get the exact mpg this weekend and post it on here. I have the same problem with the temp in the summer time. At 55 im fine but once i go 65-70 the temp will keep on going until i slow back down. I drove to Oak island last year hauling 2 seadoos and had to go 55 the whole way with the temp between 195 and 200, and that was with the mechanical fan and a heavy duty clutch. Im wondering if the timing could be the problem...right now its at 10 degrees but thats what Mastercraft told me it should be at.
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Unread 03-26-2013, 09:07 PM   #12
RockRollin
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I had an overheat issue last summer also, changed water pump, flushed system X2, still was heating up, anything above 55 for mor than ten minutes. On the advice of an old timer I installed a front air dam under the bumper, stock part. Heat up issue went away immediately. A lot of opinion swirl about electric fans. I personally like the idea but, the stock cooling system works quite well if in good repair. Few other things to check: is it running lean, is the exhaust dampner stuck closed, is the water pump flowing good, the water pump can move coolant and still not be flowing good, partially eroded impeller fins, inoperable thermostat.
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"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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Unread 03-26-2013, 10:46 PM   #13
super98lsc
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air dam is a good call. I had similar issues and behavior with the 442 once I built it up. I tried everything because I had a new OEM 4 core radiator for a 455 and was only running a hot cammed,punched,ported, small block olds with 10.5:1 compression. After 3 years of running her up to 220 and slowing down then speed up etc, my now deceased machinists said its the radiator period. I said its new etc, he replied its the radiator it flat out not big enough. Keep in mind I had already spoken with Joe Mondello he was a nice guy, and bought a special clearance aluminum pump from him and stat, monster derale dual electric fans that pull 3200 cfm each!. So I called up Be Cool and placed the order. The aluminum radiator they built fits like stock and has more tubes per inch and solved the entire problem instantly! I was really surprised it made that much difference. I now trigger 1 fan at 195 and the other with the ac or when its over 200. Or if I need to blow out the garages ;-)
__________________
www.mangierisrc.com
06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 03-28-2013, 07:45 AM   #14
super98lsc
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Rock, speaking of air dam did you find a stock one or????? Seems from pics ive seen of the 90 model it should have had a plastic one.. Mine has nothing. I do know if some form of air dam fit and looke good it would improve mileage by directing air around vs under the truck.maybe we need to smooth skid plate the entire bottoms of our rigs rofl. Like a lambo
__________________
www.mangierisrc.com
06-Corvette z51-6spd,b&b,K&N low miles.
77-Corvette Stingray 496 BBC/TH400 built 667hp+
===================================
00 WJ 4x4, 4.7 stroker, turbocharged,..lots more..
01 WJ 4x2 4.7v8 Limited (needs valve job)
90 Grand Wagoneer 401 Edelbrock Heads, Lunati .510/.527 FT Cam, Edelbrock RPM Air Gap, Holley HP 750, Thorley Headers, HEI, Electric Fan w Digital controller,4" lift 31x10.50 Goodyear Duratrac's on Pro-Comp Wheels,new interior, seats,seals,Alpine and JL full system, Remote HEI, Clifford 2 way with remote start,windows,tailgate.
96 Cherokee Country 4dr/2x2 White/Tan 3" Lift Sahara 18" Wheels 32.5"'s 99up head and intake- for sale soon!
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Unread 03-28-2013, 06:17 PM   #15
RockRollin
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Quote:
Originally Posted by super98lsc View Post
Rock, speaking of air dam did you find a stock one or????? Seems from pics ive seen of the 90 model it should have had a plastic one.. Mine has nothing. I do know if some form of air dam fit and looke good it would improve mileage by directing air around vs under the truck.maybe we need to smooth skid plate the entire bottoms of our rigs rofl. Like a lambo
For the life of me I can't see why this works. My only notion is that it keeps the air from "leeching" under the motor. I've sat and looked at it from many angles LOL.
the one I have is stock, it covers about 4" under the bumper. I'm not running a fan shroud either. I was running a half-0-shroud, but alas it has fallen.
Lambo skid plate eh........seems like I'm under this thing as much as in it that should get me in shape.
__________________
"I like fun" Edd
Clawed: 90GW, TFI, Streetfire, 3"lift all spring, 31"BFG ATs, working RKE, Edel2131, Holly 1850, mild cam,
05 Renegade OME 927, 947, top plate, JBA 4.5s
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