I'd like a set as well.
FJ40 Mark/Downey Header (6 Viewers)
- Thread starter martymart
- Start date
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LakeLaurashawn
SILVER Star
Morning - Thanks for bringing back to life a classic!
Place me on the list for 1-each please.
Lake
Place me on the list for 1-each please.
Lake
PabloCruise
SILVER Star
PabloCruise
SILVER Star
Just to clarify - do you mean 1 total?
LakeLaurashawn
SILVER Star
Yes, 1 total
Int in one for my F
Please add me to your list for a 1978 2f.
PabloCruise
SILVER Star
Interested in 1
Put me on the list also. Thanks
PabloCruise
SILVER Star
Interested in one set as well.
I'd like one for a '77 2F
brian
SILVER Star
Has there been any discussions regarding price point and ETA of availability.....even if just ballpark?
I know you’ve responded to one of my power steering conversion posts regarding seeing my headers wrapped in an associated photo. At the time, I replied that they had been wrapped for many years with no ill affect.
I bought these headers from Downey around ‘85. They have been wrapped this entire time. I’m curious why they haven’t cracked and speculate it might have been made a different way or a type of metal used? I can’t believe they’re a one-off fluke. The wrap keeps my engine bay quite cool even in 110deg weather and if these could be duplicated somehow others would have likewise success?
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He always says that. I too have never in 25 years of headers and wrap seen the wrap destroy a header.
gonzopancho
SILVER Star
I don’t know of any drag car team that takes the wrap off and then reapplies it between runs. Maybe NASCAR back in the day, IDK. I know that on dad's methanol-fueled Super Comp dragster, the engine would cool off enough to comfortably touch the headers once it was in the pits just by idling it back to the pits on the return road. Didn't run wrap on the headers either.
Top Fuel, Funny Car, Top Alcohol Dragster and Top Alcohol Funny Car rules require double-pipe insulated headers. The double tube must extend to start of bend at bottom of body. For "Advanced E.T." classes (6.00 to 7.49 seconds E.T., so Top Sportsman, Top Dragster, Pro Mod) double-pipe or thermal-wrapped insulated headers are mandatory on supercharged, methanol-burning bodied cars, but not on dragsters. This is more about fire suppression than anything. Classes below 7.50 E.T. are silent on header insulation.
But friends: we're talking about a 2F here. It's lower displacement, lower compression, and is operated at a lower RPM than your typical 'racing' engine. (Well, maybe you can run your 2F at over 6,000 RPM, but not for long.) The typical 2F probably doesn't run very lean, either.
Even the typical SBC conversion probably doesn't use a 10:1 CR and run 14:1 AFRs at WOT and > 6,000 rpm continuously. (Now someone will claim they do.) Most tuners strive for under 14:1 AFR at cruise and under 13:1 at WOT, because pistons are expensive.
Yeah, one can build a hot-rod 2F. I have @FJ60Cam building a 4.4L 'high' compression 2F for me with the Carrillo rods.
Headers (as well as cast manifolds) do oxidize with time, and wrapping a header does tend to keep the header material hotter. Increasing the heat will mean the header oxidizes faster. Oxidation will also tend to take place in the bends, or other places with high turbulence. I don't want to get into the physics of it, but it's fairly simple to understand. Thermal stresses will be highest in the bends as well.
The combination you don't want: continuous high temp operation with lower grade ('mild') steel and small radius bends. This doesn't tend to describe your typical LandCruiser drive. (I admit nothing!)
But reduced oxidation is one of the reasons we went stainless.
Top Fuel, Funny Car, Top Alcohol Dragster and Top Alcohol Funny Car rules require double-pipe insulated headers. The double tube must extend to start of bend at bottom of body. For "Advanced E.T." classes (6.00 to 7.49 seconds E.T., so Top Sportsman, Top Dragster, Pro Mod) double-pipe or thermal-wrapped insulated headers are mandatory on supercharged, methanol-burning bodied cars, but not on dragsters. This is more about fire suppression than anything. Classes below 7.50 E.T. are silent on header insulation.
But friends: we're talking about a 2F here. It's lower displacement, lower compression, and is operated at a lower RPM than your typical 'racing' engine. (Well, maybe you can run your 2F at over 6,000 RPM, but not for long.) The typical 2F probably doesn't run very lean, either.
Even the typical SBC conversion probably doesn't use a 10:1 CR and run 14:1 AFRs at WOT and > 6,000 rpm continuously. (Now someone will claim they do.) Most tuners strive for under 14:1 AFR at cruise and under 13:1 at WOT, because pistons are expensive.
Yeah, one can build a hot-rod 2F. I have @FJ60Cam building a 4.4L 'high' compression 2F for me with the Carrillo rods.
Headers (as well as cast manifolds) do oxidize with time, and wrapping a header does tend to keep the header material hotter. Increasing the heat will mean the header oxidizes faster. Oxidation will also tend to take place in the bends, or other places with high turbulence. I don't want to get into the physics of it, but it's fairly simple to understand. Thermal stresses will be highest in the bends as well.
The combination you don't want: continuous high temp operation with lower grade ('mild') steel and small radius bends. This doesn't tend to describe your typical LandCruiser drive. (I admit nothing!)
But reduced oxidation is one of the reasons we went stainless.
gonzopancho
SILVER Star
We have a pair and we're trying to get them fit to check ... fit. The holidaze interfered, and @PabloCruise ran into a camshaft / lifter issue (presumed).
Once we know they fit, we'll pull the trigger on production.
PabloCruise
SILVER Star
