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340-6 Tuning?s Autolite 66 + 195 T-Stat too much?
#3071712
08/26/22 09:24 PM
08/26/22 09:24 PM
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Joined: Apr 2012
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f2502011
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Wanting to install a 195 Stewart Components Thermostat in a 1970 340-6 Pack but can't seem to figure out which part # I need to buy. Anyone know or is there a better option? Thanks
1970 EK2 T/A 727
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: Moparite]
#3071776
08/27/22 09:41 AM
08/27/22 09:41 AM
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Joined: Aug 2003
Posts: 2,466
Answering the call of the wild
ThermoQuad
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Joined: Aug 2003
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Answering the call of the wild
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be quiet and pay attention #2 poster
COOLING system:
The engine must have a 195 degree thermostat
195 degree high flow thermostat- Stewart Components has the best quality thermostats part # 306
These are manufactured by Robert Shaw and modified by Stewart. They feature a balanced sleeve design and are designed for high flow, high RPM applications. They work! Road course tested.
A very normal operating temp is 195-215.
220 is warm
230 is HOT
240 is very hot
Use a mixture of 40% coolant/60%distilled water and a bottle of coolant conditioner
Beware of high under-hood temperatures. Measure it! Lowering the minimum operating temperature of the coolant to 180 or 160 degrees does not correct this problem. Measure the temp at the base of the carb on intake manifold. It should be the very close to the water temperature. Lean engines and or improperly timed engines create lots of under the hood heat. Power steering pumps create heat so a cooler should be installed.
Last edited by ThermoQuad; 08/27/22 09:43 AM.
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: ThermoQuad]
#3071938
08/27/22 09:18 PM
08/27/22 09:18 PM
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Joined: Jan 2003
Posts: 15,348
Omaha Ne
TJP
I Live Here
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I Live Here
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be quiet and pay attention #2 poster
COOLING system:
The engine must have a 195 degree thermostat
195 degree high flow thermostat- Stewart Components has the best quality thermostats part # 306
These are manufactured by Robert Shaw and modified by Stewart. They feature a balanced sleeve design and are designed for high flow, high RPM applications. They work! Road course tested.
A very normal operating temp is 195-215.
220 is warm
230 is HOT
240 is very hot
Use a mixture of 40% coolant/60%distilled water and a bottle of coolant conditioner
Beware of high under-hood temperatures. Measure it! Lowering the minimum operating temperature of the coolant to 180 or 160 degrees does not correct this problem. Measure the temp at the base of the carb on intake manifold. It should be the very close to the water temperature. Lean engines and or improperly timed engines create lots of under the hood heat. Power steering pumps create heat so a cooler should be installed.
Wow another temp freak on this site  I thought I was the only one  Are you using thermocouples  ?
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: TJP]
#3071941
08/27/22 09:49 PM
08/27/22 09:49 PM
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Joined: Apr 2012
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f2502011
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Part # I believe is 306 for Stewart Thermostat. Not readily available.
I cannot seem to get the six pack to run any other way but rich. Currently has a Murray 180 stat and plugs were Autolite 65s
Got the center carb mixture screws 2 turns out. 6 pack guide says 1/8 to 1/4 out on outboards but won’t work here. It won’t stay running if I do that.
Started with the outer carbs 1/4 out. Cranked but wouldn’t stay running. Before messing with anything as it was in a running but rich state, the mixture screws on the outboard carbs were between 1.5 and 2.5 turns out.
With this setting, The Autolite 65s were carbon fowled and wet on the outers. 1,2,7,8.
The one 66 in it was good with the rich mixture. That’s why I went with 66s.
Too hot of a plug? Any ideas?
Got it running with center 2 turns out, outboards 1 turn out and Autolite 66s. Exhaust smell is rich with 2, 1, and 1 but cranks right up and runs. Just stinks.
1970 EK2 T/A 727
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: f2502011]
#3071985
08/28/22 07:21 AM
08/28/22 07:21 AM
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Joined: Aug 2003
Posts: 2,466
Answering the call of the wild
ThermoQuad
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Answering the call of the wild
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The stewart number is on the post................................... No temp freaks here, just engineering geek types using modern tech devices, wide band A/F meters, IR temp gun, digital readout tach/timing light by snap no, Fluke DVM etc no need for thermocouples...lol No six pak tune up has been too tough to tame yet. Many have been tamed. What does the guide say? Read it again. OP you are over- jetted - Center carb jets at 62 or lower. 180 is the wrong thermostat temperature. 195! Pay attention! Stop wasting everyone's time with the 180 operating temp- it will not run properly at that min operating temp- it's in the guide!!!. 195 thermostat - at this pt just buy one from Napa, or look on line for a oem nos 195 temp the temp change alone to 195 will affect how it runs............. Float levels initial timing 16-18 btdc coolant mix Firecore spark plug wires plug gap 0.040 please read the guide 
Last edited by ThermoQuad; 08/28/22 07:22 AM.
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: ThermoQuad]
#3072006
08/28/22 09:20 AM
08/28/22 09:20 AM
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Joined: May 2019
Posts: 6,240
nowhere
Sniper
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What the factory did 50 yrs ago has no bearing on what needs to be done here. Set the carb/engine up per the document - It's called the baseline - that where you start the process. Works every time on this end. What document
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: ThermoQuad]
#3072054
08/28/22 12:19 PM
08/28/22 12:19 PM
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Joined: Apr 2012
Posts: 364
US
f2502011
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The stewart number is on the post................................... No temp freaks here, just engineering geek types using modern tech devices, wide band A/F meters, IR temp gun, digital readout tach/timing light by snap no, Fluke DVM etc no need for thermocouples...lol No six pak tune up has been too tough to tame yet. Many have been tamed. What does the guide say? Read it again. OP you are over- jetted - Center carb jets at 62 or lower. 180 is the wrong thermostat temperature. 195! Pay attention! Stop wasting everyone's time with the 180 operating temp- it will not run properly at that min operating temp- it's in the guide!!!. 195 thermostat - at this pt just buy one from Napa, or look on line for a oem nos 195 temp the temp change alone to 195 will affect how it runs............. Float levels initial timing 16-18 btdc coolant mix Firecore spark plug wires plug gap 0.040 please read the guide I know about the t-stat it’s on my list of to do things. I’ll probably just get a Murray from Oreilys. I’m going by the document. Maybe I wasn’t clear enough. It WILL NOT stay running at 1/8, 1/4 or even 1/2 turn out on outboards regardless as to what the guide says it DOES NOT work here and I seriously doubt going up 15 degrees in temp will change that but we’ll see. It wants at least 1 turn out to keep running. Now if it had a 160 and I was going to 195 that would be significant. What about the Autolite 66s in combo with 195 t-stat is that likely to lead to running too lean? Is the 66 ok to use?
1970 EK2 T/A 727
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: Sniper]
#3072056
08/28/22 12:26 PM
08/28/22 12:26 PM
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Joined: Aug 2003
Posts: 2,466
Answering the call of the wild
ThermoQuad
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Joined: Aug 2003
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Answering the call of the wild
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It is called " the six pak tuning guide" ....it's been posted here too many times, no one wants read it let alone to do the work required look on the lift off hood playground for it I have a much better latest revision - but i don't see any good reason to post it. I am the copy editor & collector of the information. We test six paks weekly over here. It works! Send money i will send a copy of the latest - it is pretty good. lol Same old posts, wrong thermostat, over jetted, same ole $#%^, no patience on the user end, no instrumentation, no documentation, reach thru the computer and turn the screwdriver, set my float levels.... and there is no app for your phone.   
Last edited by ThermoQuad; 08/28/22 12:30 PM.
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: ThermoQuad]
#3072082
08/28/22 01:40 PM
08/28/22 01:40 PM
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Joined: Apr 2012
Posts: 364
US
f2502011
OP
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It is called " the six pak tuning guide" ....it's been posted here too many times, no one wants read it let alone to do the work required look on the lift off hood playground for it I have a much better latest revision - but i don't see any good reason to post it. I am the copy editor & collector of the information. We test six paks weekly over here. It works! Send money i will send a copy of the latest - it is pretty good. lol Same old posts, wrong thermostat, over jetted, same ole $#%^, no patience on the user end, no instrumentation, no documentation, reach thru the computer and turn the screwdriver, set my float levels.... and there is no app for your phone. Thermostat/temp is irrelevant if it won’t stay running cause it won’t get up to 160, 180, 195. It won’t stay running with outboards less than 1 turn out. How am I over-jetted with everything stock?? What about the Autolite 66s? Are they too hot? Especially in combination with a 195 T-Stat?
1970 EK2 T/A 727
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: ThermoQuad]
#3072369
08/29/22 01:28 PM
08/29/22 01:28 PM
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Joined: Dec 2005
Posts: 11,551
Fulton County, PA
CMcAllister
Mr. Helpful
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Mr. Helpful
Joined: Dec 2005
Posts: 11,551
Fulton County, PA
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be quiet and pay attention #2 poster
COOLING system:
The engine must have a 195 degree thermostat
195 degree high flow thermostat- Stewart Components has the best quality thermostats part # 306
These are manufactured by Robert Shaw and modified by Stewart. They feature a balanced sleeve design and are designed for high flow, high RPM applications. They work! Road course tested.
A very normal operating temp is 195-215.
220 is warm
230 is HOT
240 is very hot
Use a mixture of 40% coolant/60%distilled water and a bottle of coolant conditioner
Beware of high under-hood temperatures. Measure it! Lowering the minimum operating temperature of the coolant to 180 or 160 degrees does not correct this problem. Measure the temp at the base of the carb on intake manifold. It should be the very close to the water temperature. Lean engines and or improperly timed engines create lots of under the hood heat. Power steering pumps create heat so a cooler should be installed.
Where is that quoted from? Contrary to everything I've heard and done for 50 years. High temps came about in the emission era in an attempt to reduce tailpipe emissions. Everyone, I've ever heard, and who knows anything, said cooler is better in a performance application. The 40% coolant is also strange as straight water, or something like the Evans stuff, with a bottle of Water Wetter or equivalent, is also supposed to work best. Just asking ETA...66s are too hot, unless this thing mopes around in city traffic all day. ETA... not sure why a 340 6 pac would require tuning in contrast to every other pushrod V8, but I'm all ears.
Last edited by CMcAllister; 08/29/22 01:34 PM.
If the results don't match the theory, change the theory.
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: ThermoQuad]
#3072384
08/29/22 02:05 PM
08/29/22 02:05 PM
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Joined: Jan 2003
Posts: 15,348
Omaha Ne
TJP
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 15,348
Omaha Ne
|
It is called " the six pak tuning guide" ....it's been posted here too many times, no one wants read it let alone to do the work required look on the lift off hood playground for it I have a much better latest revision - but i don't see any good reason to post it. I am the copy editor & collector of the information. We test six paks weekly over here. It works! Send money i will send a copy of the latest - it is pretty good. lol Same old posts, wrong thermostat, over jetted, same ole $#%^, no patience on the user end, no instrumentation, no documentation, reach thru the computer and turn the screwdriver, set my float levels.... and there is no app for your phone. Been running 6 packs on a multitude of vehicles for over 45 years, no issues here   BTW you may want to read IR Gun Accuracy
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: TJP]
#3072971
08/31/22 04:56 PM
08/31/22 04:56 PM
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Joined: Jul 2011
Posts: 956
Chicago
PurpleBeeper
super stock
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super stock
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Posts: 956
Chicago
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My 2-cents
1. Are the carbs used? We used to drill out a lot of orifices back in the day per Direct Connection engine guide
2. Is your power valve possibly bad?
70 Roadrunner convt. street car
440+6, NOS, 4-spd, SS springs
'96 Mustang GT convt. street car
'04 4.6 SOHC, NOS, auto, lowered
"Officer, that button is for short on-ramps"
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: PurpleBeeper]
#3072976
08/31/22 05:05 PM
08/31/22 05:05 PM
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Joined: Apr 2012
Posts: 364
US
f2502011
OP
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My 2-cents
1. Are the carbs used? We used to drill out a lot of orifices back in the day per Direct Connection engine guide
2. Is your power valve possibly bad? Only by me. They were rebuilt a few years back to stock and concourse appearance. Power valve I can easily switch out and try a new one. Why do you ask? Usually with a bad power valve you have to turn the mixture screws way in. Idle and drivability are fine. Just stinks/rich.
Last edited by f2502011; 08/31/22 05:07 PM.
1970 EK2 T/A 727
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: f2502011]
#3073059
08/31/22 09:11 PM
08/31/22 09:11 PM
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Joined: Aug 2003
Posts: 43,157
Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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How old is this fuel now?
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Stewart Components 195 Thermostat Part# Needed 340-6
[Re: Cab_Burge]
#3073222
09/01/22 11:15 AM
09/01/22 11:15 AM
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Joined: Apr 2012
Posts: 364
US
f2502011
OP
enthusiast
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OP
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How old is this fuel now? One week this Sunday
1970 EK2 T/A 727
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