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1994 Cougar XR7 DOHC/5-Speed
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Isn’t that what we affectionately call the crack pipe mod? Because the adapter is shaped like a crack pipe? 😆
Nope, that mod brings water out of the back of the head to even out cooling flow, it’s not a factory design.

The DOHC cooling layout is the same in function as a SOHC only the thermostat blocks flow from the radiator outlet via an externally mounted thermostat housing, rather than to the inlet via the crossover on the engine. When you look at a DOHC the coolant crossover has a hose that drops down in the middle of it in addition to the one that goes to the radiator, that middle hose is the coolant bypass. When the thermostat is closed water can’t flow out of the crossover into the radiator because flow is blocked on the other end by it, so the bypass is used to let water recirculate back to the water pump and into the engine. Works the same way on the 2V only it’s all done internally, the hole that needs to be drilled is the equivalent of the bypass hose, letting water go around the thermostat back to the water pump.

It’s not absolutely essential, technically the constant flow through the heater core acts as a natural bypass since coolant is recirculated back to the water pump no matter what(even more if you do do the cooling mod), many 4V builders (particularly supercharged where the crossover needs to be modified or eliminated) for that reason eliminate the bypass setup and use an inline thermostat with a small hole drilled in it to allow some coolant to pass. The main purpose really is to speed up warm up time for better heater operation, reduce engine wear and reduce emissions, in australia the 5.4 DOHCs didn’t use a bypass.

not running a thermostat at all is a bad idea though
 

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Discussion Starter · #45 ·
Well the guys came over today and we finished up the 1MTNCAT and fired it off this evening. Pretty much non eventful after going through some things yesterday. Today we put fire to it and it liked it. Couple other little things to wrap up but stage 1 and 2 are nearly complete. Hopefully test drive and finish some minor things next week before getting it ready to get tuned. Seems to be a very good install so far based on the start up. Thanks to Justin Wood, John Speziele, Jim Meshoyrer and Billy for helping out. Some video and such maybe coming soonl!
 

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The crack pipe mod was originally called the Apten Mod, they sold the piece and a holdown as a kit.
The best piece to use actually comes out of the back of certain mark Viii heads; it has a socket that fits a coolant temp sender, like the satc one, lol.
 
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Was this a full up rebuild? are you going thru a break in process with it?
 

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Discussion Starter · #48 ·
Was this a full up rebuild? are you going thru a break in process with it?
Yes, full up rebuild on this and break-in process. Wife put some video on the Facebook TCCOA site but not sure how to move them over here. Short start up vid and afterwards at idle. But anyone that can is welcome to do so.
 

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Discussion Starter · #49 ·
Been pretty busy the last couple weeks and not much done. Did receive the new throttle cable and got it installed today as well as the back half of the exhaust system finished up some small details on the fuel lines, etc. Still some things to do and finish up until its ready to motivate legally under its own power. Hopefully the next week or two. Exhaust completion, tags and legal registration, tires for the front, etc. Slowly moving along! But we'll get there!
 

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Discussion Starter · #51 ·
Finished up some of the small items the last couple weeks and actually took it down the street a couple times. Needs some much needed tuning and the exhaust finished up. Have it loaded up on trailer to hopefully have the mid pipe from header to rear exhaust tomorrow. Maybe it will act a little better once there is some exhaust behind the 02 sensors. Waiting to put the E85 Fuel cell and the rear end mods in till after I get some tuning finished . Step by step as time allows but moving forward.
 

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Looks great Steve! Great to see you back in action!
 

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Steve, looks great man.

I like the colors, and have always been a 1mtncat fan.
 
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Discussion Starter · #56 · (Edited)
Spent some time on the car hoping to tune it yesterday. EECDOC and I did accomplish getting some of the idle issues taken car of, some install issues that needed addressed, before we went but were actually unable to tune it yesterday cause the folks at the shop had no wide band for their dyno jet. We did however make 1 halfhearted pull to see what it might do on the old 1MTNCAT tune. Untuned It rocked out 300 Lbs tq and 313 Hp at the tire on the one partial pull we made. Appears to be a whole lot left on the table once we get to the point we can actually monitor and tune it. Thanks to Mike for all the help the last 2 days!!

Time will tell!
 

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Spent some time on the car hoping to tune it yesterday. EECDOC and I did accomplish getting some of the idle issues taken car of, some install issues that needed addressed, before we went but were actually unable to tune it yesterday cause the folks at the shop had no wide band for their dyno jet. We did however make 1 half hearted pull to see what it might do on the old 1MTNCAT tune. Untuned It rocked out 300 Lbs tq and 313 Hp at the tire on the one partial pull we made. Appears to be a whole lot left on the table once we get to the point we can actually monitor and tune it. Thanks to Mike for all the help the last 2 days!!

Time will tell!
No Wide band at a dyno?! What kind of Dyno shop is that? It's like going to a bring your own beer bar. WTF! That's unbelievable. Anyway, congrats on the numbers. Can't wait to see the final numbers.
 
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Agreed. But I would have a wideband permanently installed in a heavily modified car.

Al
 
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